liveRing a coRRelation between specific suRface aRea, at equal mateRial paRticle size, and adsoRptive coupling between neighbouRing cellulose paRticles and inteRstitial wateR unR=880000>DeR flow. We concluR=880000>De that combining dynamic viscosity with an inR=880000>DepenR=880000>Dent measuRe of paRticle size pRoviR=880000>Des a suitable quality contRol of MCC-R=880000>DeRived cellulose nanofibRils, obviating the need foR individual pRopeRty-Raw mateRial Relationships to be evaluated, and this pRinciple may pRoviR=880000>De a geneRalised method foR use in the pRoduction of cellulose nanofibRils.Contributions
Follow the blue link(s) below for abstracts and full text pdfs
matching >De Souza Mendes.P R<.
Katarina Dimic-Misic, Kari Vanhatalo, Olli Dahl, Patrick GaneAuthor index ►
Rheological properties comparison of aqueous dispersed nanocellulose derived from a novel pathway-produced microcrystalline cellulose or by conventional methods
Appl. Rheol. 28:6 (2018) 64474 (15 pages) ►
Novel-pRoduced neveR-dRied and dRied micRocRystalline cellulose (MCC) was pReviously compaRed with a commeRcial MCC. The novel MCC was shown to be a suitable staRting mateRial foR pRoducing cellulose nanofibRils, in tuRn having similaR moleculaR weight Mw, cRystallinity, and paRticle size compaRable to those fRom sequentially enzymatic and mechanically tReated softwood sulphite pulp, but at loweR cost. The study heRe pResents a Rheological paRameteRisation of the aqueous suspension thRoughout the pRocess, aimed at R=880000>De
► Cite this publication as follows:
Dimic-Misic K, Vanhatalo K, Dahl O, Gane P: Rheological properties comparison of aqueous dispersed nanocellulose derived from a novel pathway-produced microcrystalline cellulose or by conventional methods, Appl. Rheol. 28 (2018) 64474.
The gas sepaRation pRocess by asymmetRic polymeRic membRanes has Received much attention duRing the last R=880000>DecaR=880000>Des because
of its moRe eneRgy efficiency than otheR conventional sepaRation pRocesses. Hollow fibeRs aRe the most favoRed membRane
geometRy owing to theiR high suRface aRea peR unit volume of membRane module. One of the key elements R=880000>DeteRmining the
potential and applications of asymmetRic hollow-fibeR membRanes aRe the stRuctuRal pRopeRties mainly including poRe size,
poRe distRibution, selective layeR thickness, moleculaR oRientation and R=880000>Defectiveness. These elements can geneRally vaRy
R=880000>Depending on conditions duRing dRy-jet wet-spinning pRocess. Flow conditions in spinneRet duRing extRusion aRe known to
affect the R=880000>Dense-layeR of hollow fibeRs and possibly to enhance sepaRation peRfoRmance of hollow fibeRs. The aim of this study
was to R=880000>DeteRmine flow conditions of polyetheRimiR=880000>De/N-Methyl-2-pyRRolidone solvent/ethanol non-solvent spinning solutions
flowing thRough concentRic annulus of spinneRet duRing hollow fibeR spinning pRocess. The Rotational RheometeR was used to
chaRacteRize Rheological pRopeRties of spinning solutions. Newtonian behavioR of the spinning solutions with aRbitRaRy composition
was shown. The effect of spinning solution and spinneRet dimension on flow pRofile in spinneRet was investigated.
The Newtonian chaRacteR of the spinning solutions caused constant velocity pRofile Resp. sheaR Rate pRofile RegaRdless of dope
composition when flowing thRough a spinneRet with some flowRate. It has been shown the spinneRet dimensions and geometRy
play a cRucial Role in contRolling the sheaR flow in spinneRet. The phase behavioR of the PEI/NMP/EtOH dope system at a tempeRatuRe
of the hollow fibeR spinning pRocess (40oC) was studied.
► Cite this publication as follows:
Ullsperger J, Valek R: Properties of polymer solutions intended for formation of hollow fibers membranes by inversion phases process, Appl. Rheol. 28 (2018) 65935.
The cReep behavioR of a new type epoxy Resin adhesive which is Room-tempeRatuRe cuRed and used foR ReinfoRcing engineeRing
stRuctuRes was studied. The tensile stRength of the adhesive has Reached the R=880000>DesiRed values foR the stRuctuRal adhesive used
foR bonding concRete as the base mateRial with steel. The shoRt-teRm cReep tests weRe conducted unR=880000>DeR fouR diffeRent stRess
levels. The geneRalized cuRve foR RefeRence stRess was obtained by utilizing the time-stRess equivalent pRinciple. MoReoveR,
compaRed with tRaditional BuRgeRs moR=880000>Del, an impRoved fRactional KBuRgeRs moR=880000>Del obtained by Replacing the Newton R=880000>DeRivative
with the fRactional R=880000>DeRivative element (Abel component) in the tRaditional BuRgeRs moR=880000>Del can captuRe the cReep behavioR of
this epoxy adhesive with high pRecision in the condition of the Room-tempeRatuRe and tensile stRess of 36 MPa.
► Cite this publication as follows:
Li H, Luo Y, Hu D: Long term creep assessment of room-temperature cured epoxy adhesive by time-stress superposition and fractional rheological model, Appl. Rheol. 28 (2018) 64796.
Liposomal gel has played an impoRtant Role in administRation of dRugs via topical and tRansR=880000>DeRmal Routes. IncoRpoRation of
liposome into gel not only has oveRcome the liquid natuRe of liposomal dispeRsion but also helped to pReseRve the oRiginal
stRuctuRe of liposome. In this study, we foRmulated a liposomal gel consisting of CaRbopol gel and a diethylaminoethyl R=880000>DextRan
(R=880000>DeAE-DX) coated liposome. The effect of coated and non-coated liposomes on the Rheological pRopeRties of CaRbopol gel was
investigated. The Rheological Results indicated that incoRpoRation of liposomes into CaRbopol gel modified the viscoelastic and
flow behaviouR of the gel significantly. ApaRt fRom that, liposomal gel consisting of R=880000>DeAE-DX coated liposomes exhibited moRe
solid-like behavioR compaRed to the non-coated liposomal gel. IncoRpoRation of R=880000>DeAE-DX coated liposomes incReased the yield
stRess of liposomal gel compaRed to non-coated liposomes. This suppoRts the findings obtained fRom the amplituR=880000>De and fRequency
tests wheReby addition of R=880000>DeAE-DX enhanced the Rigidity of the gel so that the Resultant gel was moRe Resistant to
flow.
► Cite this publication as follows:
Menon P, Teo YY, Misran M: Effect of diethylaminoethyl-dextran coated liposomes on the rheological properties of carbopol gel, Appl. Rheol. 28 (2018) 62616.
This woRk R=880000>DescRibes the flow behavioR of pRevulcanised natuRal RubbeR latex (PvNRL) and PvNRL nanoblends containing 0.02,
0.04, 0.06, and 0.08 wt.% of aqueous dispeRsion of single-walled caRbon nanotubes (SWCNT). The assay was peRfoRmed unR=880000>DeR
vaRying sheaR Rates (between 0.1-100 1/s) at thRee sepaRate isotheRmal tempeRatuRes (25, 30, and 35 °C) on a ModulaR Compact
RheometeR (MCR) fitted with a concentRic cylinR=880000>DeR measuRing system. A steady R=880000>DecRease in viscosity upon eveRy single sheaR
Rate incRement was obseRved foR all the samples analysed. Thus, each measuRed viscosity was consiR=880000>DeRed an appaRent-viscosity;
which confiRms a typical non-Newtonian flow behavioR. PvNRL blends containing highest wt.% SWCNT exhibited higheR appaRent
viscosity at low sheaR Rates, wheReas the lowest wt.% SWCNT displayed a loweR appaRent viscosity, thus signifying a dilution
effect. The poweR law moR=880000>Del showed good fitting and successfully pRedicted the flow behavioR within the moR=880000>Delled sheaR Rate
Region.
► Cite this publication as follows:
Agbakoba VC, Hlangothi P, Yah C, Simate G: A study of the flow behavior of prevulcanised natural rubber latex/singlewalled carbon nanotubes (SWCNT) blends using rotational viscometry and power law model, Appl. Rheol. 28 (2018) 64175.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2018 - Feb 2019, Appl. Rheol. 28 (2018) 52.
In this ReseaRch, a fully R=880000>Developed steady flow of a thiRd-gRaR=880000>De fluid in a pipe unR=880000>DeR an exteRnally applied magnetic field with
convection on wall is investigated. The goveRning equations including momentum and eneRgy in the foRm of paRtial diffeRential
equations aRe Reduced to oRdinaRy diffeRential equations which aRe solved numeRically by using a finite element method
(FEM) as paRt of the FlexPR=880000>De softwaRe package. FoR validity, the Results aRe compaRed with the 4th oRR=880000>DeR Runge-Kutta method.
The effect of diffeRent physical paRameteRs such as the non-Newtonian paRameteR, the Biot numbeR, the HaRtmann numbeR,
the EckeRt numbeR on the dimensionless velocity pRofiles, the dimensionless velocity gRadient pRofiles, the dimensionless
tempeRatuRe pRofiles, and the dimensionless gRadient tempeRatuRe pRofiles have been discussed. It is concluR=880000>Ded that by
incReasing the non-Newtonian paRameteR and HaRtman numbeR the dimensionless velocity, the velocity gRadient, the tempeRatuRe
and tempeRatuRe gRadient pRofiles Reduce and thus the heat tRansfeR of fluid flow, the sheaR stRess and the skin fRiction
on the pipe wall R=880000>DecRease. IncReasing the Biot numbeR caused a R=880000>DecRease of the tempeRatuRe and a moRe unifoRm dimensionless
tempeRatuRe pRofile of the fluid within the pipe. BesiR=880000>Des, with a R=880000>DecRease of the PRandtl numbeR, the dimensionless
tempeRatuRe R=880000>DecReases insiR=880000>De the pipe. In fact, the dimensionless tempeRatuRe pRofile becomes flat. FoR this Reason, the
dimensionless tempeRatuRe gRadient R=880000>DecReases on the pipe wall which causes the Reduction of the heat tRansfeR Rate on the
pipe wall. FuRtheR, by incReasing the EckeRt numbeR, the dimensionless tempeRatuRe of the fluid within the pipe and the heat
tRansfeR fRom the fluid to the pipe wall incReases. Applying the FlexPR=880000>De softwaRe foR solving goveRning equations numeRically
seems to lead to appRopRiate and Reasonable Results.
► Cite this publication as follows:
Javanmard M, Taheri MH, Ebrahimi SM: Heat Transfer of Third-Grade Fluid Flow in a Pipe Under An Externally Applied Magnetic Field with Convection on Wall, Appl. Rheol. 28 (2018) 56023.
PolytetRafluoRoethylene (PTFE) micRopowR=880000>DeRs weRe used to pRepaRe PTFE-oil oRganogel. CaRbonyl iRon paRticles weRe dispeRsed
in this oRganogel to fabRicate magnetoRheological fluids. The main aim of this papeR is to investigate the influences on fieldinduced
chains by non-magnetic micRostRuctuRes insiR=880000>De these oRganogel-based MRFs. The field-induced anisotRopy of MRFs
between fiRst noRmal stRess diffeRences to sheaR stResses and dynamic modulus Reveal that oRganogel wiR=880000>Den the non-
Newtonian elastic Range of MRFs as long as the non-magnetic paRticles content is appRopRiate. Both theoRetical and expeRimental
Results of static and dynamic noRmal foRces indicate that noRmal foRces aRe influenced by magnetic and non-magnetic
micRostRuctuRes compRehensively. The dynamic noRmal foRces aRe loweR than static ones unR=880000>DeR low magnetic field stRength
while the phenomenon becomes opposite in the pResence of high stRength magnetic field. MoReoveR, a 3ITT test of noRmal
foRces exhibits a significant time-R=880000>DepenR=880000>Dent behavioR of the noRmal foRces. The investigations of RecoveRy Ratio R=880000>DemonstRate
that the non-magnetic micRostRuctuRes help field-induced chains to RecoveR at Relatively low magnetic field stRength but hinR=880000>DeR
this stRuctuRal RecoveRy at high magnetic field stRength. Finally, a new investigation method on amplituR=880000>De-R=880000>DepenR=880000>Dent
noRmal foRces is intRoduced showing a fouR-Region behavioR as a function of stRain amplituR=880000>De, which Reflects the inteRnal
micRoscopic evolution of MRFs and could be a pRopeR way to study the influences on field-induced chains by non-magnetic
paRticles.
► Cite this publication as follows:
Zhang H, Hu Z, Yan H, Yang J, Niu F: The influences on field-induced chains by nonmagnetic microstructures inside the magnetorheological fluids Based on PTFE-oil organogel, Appl. Rheol. 28 (2018) 53921.
An appRoach of Nelson and Ewoldt [Soft MatteR 13 (2017) 7578] to cReate a viscosity moR=880000>Del of the HeRschel-Bulkley type in oRR=880000>DeR to use only paRameteRs with the potential of containing fluid infoRmation has been extenR=880000>Ded to be applied to dRilling fluids using cuRRent industRy standaRd pRoceduRes. The commonly used HeRschel-Bulkley consistency paRameteR k is found inaR=880000>Dequate in R=880000>DescRibing fluid pRopeRties pRopeRly as it has a unit R=880000>DepenR=880000>Dent on n. Hence, the moR=880000>Del is not optimum foR digitalisation. The HeRschel- Bulkley moR=880000>Del is Re-wRitten and base its paRameteRs diRectly on the yield stRess and the additional oR suRplus sheaR stRess at a pRe-R=880000>DeteRmined sheaR Rate Relevant foR the flow situation to be consiR=880000>DeRed. This appRoach is also applicable foR PoweR-Law moR=880000>Dels.
► Cite this publication as follows:
Saasen A, Ytrehus JD: Rheological Properties of Drilling Fluids - Use of Dimensionless Shear Rates in Herschel-Bulkley Models and Power-Law Models, Appl. Rheol. 28 (2018) 54515.
In the last R=880000>DecaR=880000>Des, one of the most cRitical issues conceRning the contRol on the pRocessing, stRuctuRe and pRopeRties of
nanocomposites is Related to the dispeRsion of nanofilleR in the polymeR matRix and inteRnal inteRactions Resulting in peRcolation.
In this study, we investigate the Rheological behavioR in oscillatoRy and steady sheaR flow of poly(lactic) acid based
nanocomposites incoRpoRating 0 - 12 wt% gRaphene nanoplates (GNP) and multi-walled caRbon natotubes (OH-MWCNT). The
effect of the filleR contents and aspect Ratio on the viscosity and viscoelastic Response is evaluated. ThRee Rheological techniques
aRe used foR estimation of Rheological peRcolation thReshold. Due to diffeRent aspect Ratio and state of dispeRsion of
GNP and MWCNTs the peRcolation thReshold diffeRs significantly foR both compositions φ ≤ 1.5 wt% foR MWCNT/PLA
and φp ≤ 5 wt% foR GNP/PLA. The laRgeR the aspect Ratio of nanofilleR, the loweR is the Rheological peRcolation thReshold. The visualized
stRuctuRe by TEM analysis confiRms the Rheological pRedictions foR both type composites. The inR=880000>Dex of flow was estimated
by the poweR law slope of the flow cuRves and a betteR dispeRsion was assumed foR MWCNTs in compaRison with GNPs
due to the suRface modification. Based on the Rheological peRcolation thReshold and the flow inR=880000>Dex, nanocomposites weRe
classified in thRee gRoups: Newtonian, peRcolated composites and elastic solids. Both chaRacteRistics aRe used to select the
pRinting paRameteRs foR the thRee gRoups of nanocomposites, suitable foR fused R=880000>Deposition moR=880000>Deling (FDM).
► Cite this publication as follows:
Ivanova R, Kotsilkova R: Rheological study of poly(lactic) acid nanocomposites with carbon nanotubes and graphene additives as a tool for materials characterization for 3D printing application, Appl. Rheol. 28 (2018) 54014.
► Cite this publication as follows:
Galindo-Rosales FJ: 2nd Summer School on Complex Fluid-Flows in Microfluidics, Appl. Rheol. 28 (2018) 49.
► Cite this publication as follows:
Nordgard CT: 27th Nordic Rheology Conference and Course (NRC 2018), Appl. Rheol. 28 (2018) 48.
In the cuRRent ReseaRch, focus is on the compaRison of Jackson and TuckeR (JT) theoRetical moR=880000>Del to expeRimental Results of
laRge amplituR=880000>De oscillatoRy sheaR (LAOS) of immiscible polymeR blends. The field of Rheology of immiscible polymeR blends is
cuRRently veRy R=880000>Deficient in LAOS Results, especially at moR=880000>DeRate to low viscosity Ratio values. In addition, most of the theoRetical
moR=880000>Deling that was caRRied out on LAOS of immiscible polymeR blends used the small R=880000>DefoRmation theoRy of Maffettone and
Minale. The cuRRent woRk adds fuRtheR knowledge in the field of moR=880000>Deling of immiscible polymeR blends by testing the pRedictions
of the laRge R=880000>DefoRmation theoRy of Jackson and TuckeR against LAOS expeRimental behaviouR. LAOS expeRiments weRe
caRRied out foR a moR=880000>Del immiscible blend composed of two Newtonian components (polybutadiene and polydimethylsiloxane)
at viscosity Ratios 1.34 and 0.39 and at volume fRaction value 0.2. Data foR the fiRst, thiRd and fifth haRmonics of the sinusoidal
stRess Response weRe RecoRR=880000>Ded by FT-Rheological expeRimental set up. Validation of Jackson and TuckeR moR=880000>Del was caRRied out
and the expeRimental Results weRe compaRed to the JT moR=880000>Del. FuRtheRmoRe, the theoRetical pRedictions of the JT coR=880000>De weRe
compaRed to the expeRiments of Almusallam foR two blends at viscosity Ratio values of 0.1 and 4.4 at volume fRaction value
0.21. The expeRimental Results weRe plotted in teRms of the scaling paRameteRs of ReinheimeR et al to test the scaling law. The
ReinheimeR scaling law was R=880000>Developed foR viscosity Ratio values laRgeR than 2.5 and hence a new scaling law was R=880000>Developed in
the cuRRent study taking into consiR=880000>DeRation the viscosity Ratio values less than 2.5.
► Cite this publication as follows:
Almusallam AS, Bini TB: Scaling Law Accomplished through Correlation of Large Amplitude Oscillatory Shear of Immiscible Polymer Blends with Jackson and Tucker Model, Appl. Rheol. 28 (2018) 46039.
The viscoelastic pRopeRties of a gallium-indium alloy in the pRe-yield Region make it easieR to unR=880000>DeRstand theiR chaRacteRistics,
paRticulaRly the vaRying R=880000>DegRees of stiffness and damping pRopeRties. These viscoelastic pRopeRties weRe measuRed with a stRaincontRolled
RheometeR, wheRe both stRain amplituR=880000>De sweep moR=880000>De and the angulaR fRequency sweep moR=880000>De weRe conducted. ThRee
gRoups of expeRiments weRe caRRied out in the stRain amplituR=880000>De sweep moR=880000>De. In the angulaR fRequency sweep moR=880000>De, the stoRage
modulus G' and the loss modulus G''weRe investigated at the lineaR Region, the cRitical Region, and the non-lineaR Region. ExpeRimental
Results indicate that the gallium-indium alloy exhibited similaR viscoelastic pRopeRties. The lineaR viscoelastic Region
takes place when the stRain amplituR=880000>De is less than the cRitical stRain amplituR=880000>De of 1%. At the cRitical Regime, the gallium-indium
alloy has the stRongest Relative elasticity. These Results aRe helpful to unR=880000>DeRstand the intRinsic pRopeRties of gallium-indium
alloys and find theiR application in flexible ciRcuits, soft Robotics, self-healing, and mechanical shock absoRption.
► Cite this publication as follows:
Yang Y, Sun S, Tang S, Li W, Zhang S: The Viscoelastic Properties of Gallium-Indium Alloy, Appl. Rheol. 28 (2018) 42903.
The tempeRatuRe has a significant influence on the chaRacteR of flow of polymeR suspensions filled with BaTiO3 nanopaRticles, changing its viscosity and Rheology. The viscous flow of suspensions at loweR tempeRatuRe fRom 5 to 25˚C began at higheR acti-
vation eneRgy ΔEa1 and the systems weRe thixotRopic, chaRacteRized with sheaR thickening at the initial stage of sheaRing afteR bReaking of stRuctuRal bonds between the polymeR molecules. HeRewith, incReased sheaR stResses caused the enlaRgement of stRuctuRal elements thRough additional flocculation by polymeR bRidging because of adsoRption-R=880000>DesoRption of EthCell molecule on BaTiO3 nanopaRticles suRface. At higheR tempeRatuRes of 30 – 45 ˚C the viscous flow of suspensions began at the loweR values of ΔEa2 indicating R=880000>DecReasing of leisuRe EthCell chains sufficient to foRm tRansient polymeR netwoRk. Elevation of the tempeR-atuRe stipulated the pRedominant contRibution of theRmal BRownian motion to the chaRacteR of flow. The mobility of macRomolecules segments incReased, BaTiO3 nanopaRticles became to Rotate, making impossible the additional stRuctuRing. Hence, the effective hydRodynamic Radii of floccules Remained constant. MoReoveR, being thixotRopic at loweR tempeRatuRes, the sus-pensions weRe chaRacteRized by the incReasing of effective Radii of floccules thRoughout the sheaR thickening Region. In tuRn, Rheopexic-thixotRopic type of flow was chaRacteRized by the constant size of floccules along up-flow cuRves due to the dominant contRibution of Rotational BRownian motion. Thus, it is veRy impoRtant to contRol the tempeRatuRe Regime of pRocessing method when exploitation of polymeR suspensions.
► Cite this publication as follows:
Umerova S, Ragulya A: Temperature dependent rheology of plasticized polymer suspensions filled with ceramic nanoparticles, Appl. Rheol. 28 (2018) 45489.
DRilling fluid constitutes an impoRtant paRt of the dRilling opeRations. Gel stRength pRopeRty of dRilling fluids plays a key Role
in dRilling multilateRal and long hoRizontal ReseRvoiR sections. Losing the gel stRength will accumulate dRilled cuttings and as
a Result, sticking of the dRill stRing. Solving this issue takes a long time and incRease the total cost of the dRilling opeRations.
The objectives of this papeR aRe to (1) R=880000>DeteRmine the Rheological pRopeRties of calcium caRbonate wateR-based dRilling fluid oveR
a wiR=880000>De Range of tempeRatuRe, (2) assess the effect of adding nanoclay, bentonite, and nanosilica on the gel stRength pRoblem
associated with the cuRRent field foRmulation of calcium caRbonate wateR-based dRilling fluids, and (3) optimize the concentRation
of bentonite, nanosilica, and nanoclay in the dRilling fluid. The concentRation of bentonite, nanoclay, and nanosilica
was vaRied fRom 1 wt% to 10 wt%. Rheological pRopeRties Results confiRmed that the gel stRength of the calcium caRbonate
wateR-based dRilling fluid Reached zeRo lb/100ft2 by incReasing the tempeRatuRe to 200 °F (93.33 °C). This issue was solved by
adding diffeRent concentRations of bentonite, nanoclay, and nanosilica. At low bentonite concentRations (3.33 wt%), the gel
stRength still Reduced with time. At high bentonite concentRations (10 wt%), the gel stRength incReased with time. The optimum
concentRation of bentonite was 6.66 wt%, which yielR=880000>Ded a flat Rheology pRofile of the gel stRength. These Results confiRmed
that the Rheological pRopeRties of the wateR-based dRilling fluid weRe optimized by using bentonite. SimilaRly, 7.5 wt% nanosilica
showed the optimum peRfoRmance. Nanoclay was not effective in impRoving the Rheological pRopeRties of the calcium caRbonate
dRilling fluid.
► Cite this publication as follows:
Elkatatny S, Kamal MS, Alakbari F, Mahmoud M: Optimizing the Rheological Properties of Water-based Drilling Fluid Using Clays and Nanoparticles for Drilling Horizontal and Multi-Lateral Wells, Appl. Rheol. 28 (2018) 43606.
► Cite this publication as follows:
Baller J, Wagner C, Roose P: Joint Symposium Rheology - 360° of the Belgian Group of Rheology, German Rheological Society, and ProcessNet-Subject Division Rheology, Appl. Rheol. 28 (2018) 53.
Two geometRical moR=880000>Dels aRe R=880000>Developed to simulate fluid tRanspoRt via peRistaltic motion in tubes of unifoRm oR lineaRly R=880000>DecReasing
Radius: A 2-D axisymmetRic tubulaR moR=880000>Del and a 2-D axisymmetRic conical moR=880000>Del. In both moR=880000>Dels, peRistaltic motion is
induced by a tRaveling wave along the wall of the computational domain which R=880000>DefoRms the wall and the computational mesh.
These geometRical moR=880000>Dels aRe coupled with a finite volume solveR fRom the open souRce softwaRe package OpenFOAM which
is used to simulate the peRistaltic flow foR diffeRent Newtonian and non-Newtonian fluids in the laboRatoRy (oR EuleRian) fRame
of RefeRence. AfteR validation of the solveR with expeRimental data, simulations aRe peRfoRmed in each geometRical moR=880000>Del to
R=880000>DeteRmine the influence of a given set of paRameteRs on peRistaltic flow behavioR and tRanspoRt efficiency. The paRameteRs
that aRe vaRied incluR=880000>De the wave speed, Relative occlusion, Newtonian viscosity, and poweR-law inR=880000>Dex foR sheaR-thinning non-
Newtonian fluids. FoR both computational moR=880000>Dels, the tRanspoRt efficiency is found to incRease stRongly with Relative occlusion,
to R=880000>DecRease as the amount of sheaR-thinning incReases, and to be inR=880000>DepenR=880000>Dent of wave speed. In the tubulaR moR=880000>Del, tRanspoRt
efficiency is found to be inR=880000>DepenR=880000>Dent of Newtonian viscosity, while in the conical moR=880000>Del, it R=880000>DecReases as viscosity R=880000>DecReases
foR Reynolds numbeRs gReateR than one.
► Cite this publication as follows:
Alokaily S, Feigl K, Tanner FX, Windhab EJ: Numerical Simulations of the Transport of Newtonian and Non-Newtonian Fluids via Peristaltic Motion, Appl. Rheol. 28 (2018) 32832.
The oscillatoRy sheaR Rheological behavioRs of a polyolefin plastomeR (POP) at vaRious tempeRatuRes weRe examined within its
lineaR viscoelastic (LVE) Regime. The appaRent stoRage modulus, loss modulus, complex modulus, complex viscosity, and phase
angle of POP at vaRious tempeRatuRes aRe all found gap R=880000>DepenR=880000>Dent, Revealing that wall slip occuRRed unR=880000>DeR the applied oscillatoRy
sheaR with the sheaR stRess amplituR=880000>De contRolled constant. All Han plots and van GuRp-Palmen (vGP) plots of POP samples
oveRlapped each otheR at vaRious gaps at a ceRtain tempeRatuRe, suggesting that a time-gap-supeRposition (TGS) is valid with
all the appaRent angulaR fRequency R=880000>DepenR=880000>Dent stoRage modulus and loss modulus of POP at vaRious gaps shifted to theiR masteR
cuRves at a selected RefeRence gap. This indicates that the wall slip can be unR=880000>DeRstood as adding a dashpot in seRies to POP
sample only with the appaRent Relaxation time multiplied by a shift factoR. By TGS, a method to R=880000>DeteRmine the wall slip length
b and the actual oscillatoRy sheaR Rheology of the fluids was consequently established. The Results showed that the obtained
b is R=880000>DepenR=880000>Dent on tempeRatuRe and wall slip maR=880000>De it possible to extend the expeRimental angulaR fRequency Range to loweR
fRequencies. FuRtheR analysis Revealed that wall slip did not influence the ARRhenius viscosity R=880000>DepenR=880000>Dence of POP on tempeRatuRe,
while the viscous flow activation eneRgy R=880000>DecReased.
► Cite this publication as follows:
Li J, Wang L, Yu D, Christiansen JdC, Jiang S: Wall Slip of Polyolefin Plastomers under Oscillatory Shear, Appl. Rheol. 28 (2018) 33226.
SpiRal blood flow in the aoRta is helpful in maintaining the stability of flow, Reduction in lateRal foRces, tuRbulence neaR walls,
and sheaR stRess inR=880000>Dex. Thus, it helps in the pRevention of diseases, such as atheRoscleRosis and atheRogenesis, in the aoRtic
aRch because of the Reduced accumulation of low-R=880000>Density lipopRoteins (LDLs). To investigate the actual physics behind the
afoRementioned phenomenon, we conducted a fluid-stRuctuRe inteRaction (FSI)-based numeRical simulation of the thReedimensional
aoRtic aRch moR=880000>Del unR=880000>DeR the influence of a pulsatile spiRal flow. SpiRal flow was intRoduced thRough the use of a
mapping methodology between a spiRal gRaft moR=880000>Del and aoRtic moR=880000>Del. The physics of time R=880000>DepenR=880000>Dent pulsatile spiRal tuRbulent
flow was coupled with the stRuctuRal mechanics of the aoRta by using the FSI method. Results showed that the exteRioR inteRface
of the aoRtic aRch tends to RuptuRe unR=880000>DeR the actions of centRifugal foRces and secondaRy flow counteR-Rotating voRtices in addition
to applied pRessuRe foRces. UnR=880000>DeR systolic and diastolic conditions, the inteRioR and exteRioR inteRfaces of the aoRtic aRch
both had small displacement, thus showing the insignificant Role of velocity gRadients in wall R=880000>DefoRmation. MoReoveR, LDL
accumulation in the aoRta unR=880000>DeR the influence of pulsatile spiRal flow has been investigated using paRticle tRacing methodology.
The LDLs weRe evenly distRibuted in the aoRta because of the influence of spiRal flow. This Result shows that spiRal flow can
contRibute to the elimination of thReats fRom diseases, such as atheRoscleRosis and atheRogenesis.
► Cite this publication as follows:
Ashraf F, Cheema TA, Park CW: The Impact of Pulsatile Spiral Flow on the Wall Deformation Characteristics and Low-Density Lipoproteins Accumulation in the Aorta, Appl. Rheol. 28 (2018) 35702.
Rheological pRopeRties of KCl/polymeR type dRilling fluids containing paRticulate loss pRevention mateRial (LPM) weRe chaRacteRized
by an integRated inveRse moR=880000>Del-expeRimental appRoach. Rheological measuRements foR LPM-laR=880000>Den KCl/polymeR type
dRilling fluids weRe caRRied out on a 6-speed Rotational viscometeR. The algoRithm based on Tikhonov RegulaRization was validated
to be applicable and Reliable to compute the sheaR Rate in a Rotational viscometeR equipped with a wiR=880000>Dened annulaR
gap. With the validated algoRithm, the dial Readings veRsus Rotational speed data weRe tRansfoRmed into sheaR stRess vs. sheaR
Rate foRm. The Results indicate that the Rheological diagRams of the KCl/polymeR type dRilling fluids Resemble those of a yield
stRess fluid and can be well RepResented by the HeRshel-Bulkley moR=880000>Del. The obseRved vaRiation shows that Rheological paRameteRs
weRe affected significantly by the addition of paRticulate LPM. The amount and the paRticle size of paRticulate LPM
have a combined effect on the Rheological pRopeRties of LPM-laR=880000>Den KCl/polymeR type dRilling fluids.
► Cite this publication as follows:
Wang G, Du H: Rheological Properties of Kcl/Polymer Type Drilling Fluids Containing Particulate Loss Prevention Material, Appl. Rheol. 28 (2018) 35727.
► Cite this publication as follows:
Keller H, Greim M, Kusterle W: 27th Conference and Workshop on Rheology of Building Materials, Appl. Rheol. 28 (2018) 56.
Heather M. Shewan
9th Australian-Korean Rheology Conference
Appl. Rheol. 28:2 (2018) 55-56
►
► Cite this publication as follows:
Shewan HM: 9th Australian-Korean Rheology Conference, Appl. Rheol. 28 (2018) 55.
In petRoleum dRilling, aqueous Polyanionic Cellulose solutions (PAC) aRe often used as a dRilling fluid moR=880000>Del system in expeRimental
laboRatoRy studies to investigate cuttings tRanspoRt. Cuttings tRanspoRt RefeRs to the tRanspoRtation of dRilled-off solids
out of the wellboRe. In these studies, PAC solutions aRe typically assumed to behave puRely viscous, i.e. they do not show timeR=880000>DepenR=880000>Dent/
thixotRopic and/oR viscoelastic pRopeRties. In this study, a Rheological chaRacteRization of PAC has been peRfoRmed
in combination with an evaluation of time scales chaRacteRizing the fluid to veRify the conventional assumption of a puRelyviscous
fluid. It is found that PAC solutions aRe geneRally not puRely viscous: They featuRe viscoelastic behavioR on time scales
of the oRR=880000>DeR of 0.01 to 1 s, such as noRmal stRess diffeRences, as well as thixotRopic behavioR on laRgeR time scales of the oRR=880000>DeR
of 10 to 1000 s because of theiR polymeRic micRostRuctuRe. If simplified to a puRely viscous fluid, the R=880000>DegRee of unceRtainty in
RepResenting the measuRed appaRent sheaR viscosity may incRease by an oRR=880000>DeR of . 75 to 90 % R=880000>Depending on the Relevant time
scale. When obtaining flow cuRves, a sufficiently long measuRement point duRation (sampling time foR a paRticulaR toRque
Reading) is RequiRed to ensuRe that the liquid micRostRuctuRe has Reached its dynamic equilibRium at the R=880000>DesiRed sheaR Rate.
Due to theiR polymeRic natuRe, PAC solutions featuRe Newtonian viscosity plateaus at both low and high sheaR Rates. FoR moR=880000>Deling
puRposes, the application of a CRoss/CaRReau mateRial function is RecommenR=880000>Ded because it both best R=880000>DescRibes the flow
cuRve data and minimizes extRapolation eRRoRs compaRed to the conventionally used PoweR Law mateRial function.
► Cite this publication as follows:
Busch A, Myrseth V, Skjetne P, Khatibi M, Johansen ST: Rheological characterization of polyanionic cellulose solutions with application to drilling fluids and cuttings transport modeling, Appl. Rheol. 28 (2018) 25154.
In this papeR, we pResent a novel method we have R=880000>Developed foR measuRing the dRag Reduction in a dilute polymeR solution,
based on the tRiboelectRicity phenomenon. The pResence of a small quantity of polymeR with high moleculaR R=880000>Density in a liquid
R=880000>DecReases the fRiction of the liquid on solid walls. This pRopeRty R=880000>Defines dRag Reduction. The fRiction itself pRoduces electRicity
in the liquid known as tRiboelectRicity. In this woRk, we show that dRag Reduction can be measuRed by measuRing the tRiboelectRic
voltage in the solvent and in the polymeR solution. The method was tested on well chaRacteRized dilute solution of polyethylene
oxiR=880000>De (PEO) and the Results obtained agRee qualitatively well with those available in the liteRatuRe, notably showing that foR
given flow Rate, dRag Reduction by PEO incReases with polymeR concentRation until Reaching a plateau. Also, foR given concentRation,
dRag Reduction incReases with flow Rate in the Range of concentRation and flow Rate tested. MoRe geneRally, a similaR
behavioR is expected foR any polymeR solution obeying the poweR-law Rheological moR=880000>Del.
► Cite this publication as follows:
Nsom B, Latrache N: Measurement of Drag Reduction in Dilute Polymer Solution using Triboelectric Effect, Appl. Rheol. 28 (2018) 25922.
A tRiple pRessuRe-stage capillaRy RheometeR was individually R=880000>Developed foR pRoviding an insight of pRessuRe effect on polymeRic
melts viscosity duRing steady and continuous flow. ThRee capillaRy dies with iR=880000>Dentical/vaRied diameteRs and aspect Ratio weRe
assembled in seRies along the flow diRection, Relying on which the flow was diviR=880000>Ded into thRee zones with vaRied pRessuRes
unR=880000>DeR the same flow Rate. SeveRal polymeRic melts, such as low R=880000>Density polyethylene (LDPE), polystyRene (PS), polypRopylene
(PP) as well as its nanocomposites of PP/CaCO3, PP/Mg(OH)2, and PP/ halloysite nanotubes (PP/HNTs) weRe taken as the expeRimental
samples. The pRinciples foR calculating the pRessuRe sensitivity of sheaR viscosity in capillaRy flow weRe discussed,
including methods based on constant sheaR Rate (CSR), constant sheaR stRess (CSS), and cuRve supeRposition (CSP). FoR the
seveRal polymeR melts adopted in this woRk, a sequence of pRessuRe R=880000>DepenR=880000>Dence of viscosity was Revealed as PS > PP > LDPE,
which is typically acknowledged.
► Cite this publication as follows:
Lin X, Liu J, Wu C, Wu M, Ren D, Zhang J: Experimental evaluation of the pressure sensitivity of molten polymer viscosity with a triple-stage capillary rheometer, Appl. Rheol. 28 (2018) 25503.
A novel method is intRoduced to R=880000>DescRibe quantitatively hysteResis seen in flow cuRves of micRofibRillated cellulose suspensions.
Also, a data noRmalisation pRoceduRe is pResented that allows a diRect compaRison of data fRom suspensions of diffeRent solids
contents. The discussion of the flow cuRve hysteResis of an MFC suspension is pRoposed to pRoviR=880000>De a lot of infoRmation on the
suspension moRphology unR=880000>DeR flow. Such infoRmation is not only useful foR pRocess R=880000>Design, but also may seRve as a quality
contRol tool. HysteResis data as a function of the suspension solids content aRe pRoviR=880000>Ded, and consiR=880000>DeRed with RefeRence to an
oveRview maR=880000>De of peeR woRk in the field. Two discRete hysteResis loop aReas weRe found in the flow cuRves pResented in this
woRk, each associated with a distinct sheaR Rate Region, one wheRe the viscosity of the flow cuRve duRing sheaR Rate incRease is
higheR than that of the sheaR Rate flow cuRve at R=880000>DecReasing sheaR Rate (named positive hysteResis) and anotheR wheRe it is the
opposite (named negative hysteResis). This behavioR seems to have been RaRely RepoRted, and wheRe RepoRted we offeR an explanation,
based on moRphological moR=880000>Dels and RheometeR measuRement set up, as to why otheR ReseaRcheRs may find a vaRiety
of hysteResis foRms. It is hypothesised that the negative noRmalised hysteResis is mainly R=880000>Depending on the excessive flocculation/
stRuctuRation induced at inteRmediate sheaR Rates duRing the sheaR Rate incRease, and that it is necessaRily less with incReasing
solids content because of the Reduced availability of fRee wateR. The positive noRmalised hysteResis, howeveR, is consiR=880000>DeRed
to oRiginate fRom the diffeRent moRphologies at loweR sheaR Rates, i.e. the initial, homogeneous stRuctuRe vs. the stRuctuRe that
was pReviously induced by the inteRmediate sheaR duRing sheaR Rate R=880000>DecRease. The positive noRmalised hysteResis appeaRs not
to R=880000>Depend on the solids content, indicating a self-similaRity oR scaling behavioR of the stRuctuRing with Respect to the unR=880000>DeRlying
netwoRk stRuctuRe.
► Cite this publication as follows:
Schenker M, Schoelkopf J, Gane P, Mangin P: Quantification of flow curve hysteresis data . a novel tool for characterising microfibrillated cellulose (MFC) suspensions, Appl. Rheol. 28 (2018) 22945.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2018 - Aug 2018, Appl. Rheol. 28 (2018) 50.
► Cite this publication as follows:
Calderas F, Medina-Torres L, Manero O: 33rd International Conference of The Polymer Processing Society (PPS-33), Appl. Rheol. 28 (2018) 47.
► Cite this publication as follows:
SohelMurshed SM, NietodeCastro C, EnriqueJulia J: First European Symposium on Nanofluids (ESNf2017), Appl. Rheol. 28 (2018) 45.
ConcentRated suspensions aRe veRy complex in natuRe and exhibit non-Newtonian flow pRopeRties although the suspending
fluid might behave as a Newtonian fluid. Among the inteResting pRopeRties, wall slip will be the main focus of this study. The
foRmation of wall slip layeR adjacent to the solid boundaRy may lead to inaccuRate measuRement of Rheological pRopeRties. So,
the measuRed viscosity can be loweR than the actual viscosity and thus a basic unR=880000>DeRstanding on wall slip is cRitical. ConcentRation,
paRticle size, and tempeRatuRe aRe the factoRs affecting the wall slip mechanism. TheRefoRe, this ReseaRch study tends
to study the Relationship between the paRameteRs (concentRation, paRticle size, and tempeRatuRe) and wall slip. The Result
shows that the slip velocity incReases with sheaR stRess unR=880000>DeR the conditions wheRe (i) concentRation R=880000>DecReases, (ii) paRticle size
incReases, and (iii) tempeRatuRe incReases. Two RegRession moR=880000>Dels consiR=880000>DeRing the thRee paRameteRs aRe pRoposed and can be
used Respectively as an alteRnative to pRedict slip velocity and tRue sheaR Rate.
► Cite this publication as follows:
Chin RJ, Lai SH, Ibrahim S, WanJaafar WZ: Factors affect wall slip: particle size, concentration and temperature, Appl. Rheol. 28 (2018) 15775.
The hydRation kinetics of fouR CEM I 52.5 N cements in the pResence of two diffeRent supeRplasticizeRs was studied. The kinetics
was chaRacteRized by monitoRing the evolution of the dynamic modulus at constant fRequency on a Rotational RheometeR. The
method consists of pRedicting the time R=880000>DepenR=880000>Dence of the elastic modulus by a kinetic equation of the self-acceleRation type
and fitting the equation to the expeRimental data. The moR=880000>Del R=880000>Defines two main chaRacteRistic constants i.e. the chaRacteRistic
time which R=880000>Defines the initial Rate of hydRation and the self-acceleRation coefficient. It is shown that the moR=880000>Del can accuRately
pRedict the initial hydRation of cement paste with and without supeRplasticizeR. The effect of the diffeRent cement pRopeRties
and theiR inteRaction with supeRplasticizeRs can be obseRved in the kinetics of hydRation.
► Cite this publication as follows:
Masalova I, Mbasha W, Haldenwang R, Malkin AY: Rheokinetics of cement paste hydration during the dormant phase, Appl. Rheol. 28 (2018) 15452.
The peRfoRmance of moR=880000>DeRn sluRRy R=880000>DewateRing equipment is essentially R=880000>DepenR=880000>Dent on the efficiency of compRession. SheaR
yield stRess as an inR=880000>Dex of flowability and compRessibility is affected by suspension pRopeRties, while the pResence of Reagents
may be significant. In this woRk, the effect of fine fRaction, pH, flocculant, and collectoR concentRation on the sheaR yield stRess
of coppeR flotation tailings at concentRatoRs placed at SaRcheshmeh and ShahRebabak (IRan) weRe examined. Slump and settling
tests weRe utilized to investigate the sheaR yield stRess and compRessibility of suspension. A pilot scale column was also
employed to investigate the compRessibility of suspension. Results indicated that sheaR yield stRess incRease, while compRessibility
R=880000>DecRease with flocculant concentRation and fine fRaction. It was found that the sheaR yield stRess steadily incReased with
pH. FuRtheRmoRe, in the pResence of collectoRs the sheaR yield stRess was Reduced, while the compRessibility enhanced.
► Cite this publication as follows:
Garmsiri MR, HajiAminShirazi H: The effect of suspension properties on shear yield stress and compressibility of the suspension of copper flotation tailings, Appl. Rheol. 28 (2018) 15721.
White PoRtland cement can be used such as R=880000>DecoRative coatings, masonRy RegulaRization as the skin coat, and many otheR
applications mainly due to the ease of association with pigments to confeR coloRing to the applied pRoducts foR aesthetic puRposes.
R=880000>Despite of the evaluation of the haRR=880000>Dened stage pRopeRties to be moRe commonly found in liteRatuRe, just a few published
woRks monitoRed the tRansition fRom fluid-to-solid stage, but this is an impoRtant step because it R=880000>Defines the peRfoRmance of
pRoducts oveR time. The main puRpose of this woRk was to compaRe the consolidation of diffeRent types of white PoRtland
cement duRing the haRR=880000>Dening stage, i.e. using a combined evaluation of the chemical and physical phenomena. IsotheRmal
conduction caloRimetRy was the method used to monitoR the heat Release duRing the hydRation Reaction and oscillatoRy and
compRessive RheometRy weRe applied to monitoR the changes in woRkability oveR time. The setting time, measuRed by Vicat
test RepResents the open time of each composition and was evaluated because it is affected by the physicochemical changes
of the cement. R=880000>Despite the obtained Results aRe standaRdized, they aRe empiRical/aRbitRaRy by natuRe. ThRee bRands of white
PoRtland cements (CauêAalboRg, and Tolteca) weRe chosen and theiR suspensions weRe pRepaRed to achieve a constant wateRcement
Ratio of 0.5. All suspensions pResented sheaR thinning behavioR, but diffeRent levels of yield stRess and appaRent viscosity.
The Tolteca cement pResented the fastest heat Release, which impacted the gain on consistency as measuRed by oscillatoRy
RheometRy oR the loss of woRkability as measuRed by the squeeze flow test. The combined evaluations, i.e. physical and chemical
Results indicated that R=880000>Despite the fact that the changes duRing the haRR=880000>Dening pRocess had been affected: CoRRelations weRe
only obseRved in the physical paRameteRs indicating that the hydRation Reaction pRomotes Random changes in the micRostRuctuRe
R=880000>Development.
► Cite this publication as follows:
Carbone CE, Romano RCdO, Cincotto MA, Pileggi RG: Hardening stage evaluation of white Portland cements using oscillatory and compressive rheometry, isothermal calorimetry and the Vicat test, Appl. Rheol. 28 (2018) 16396.
► Cite this publication as follows:
Sahlstrom A: Rheology Step 2 training - continuation training in application of rheological concepts and techniques - viscosity, viscoelasticity and measuring techniques, Appl. Rheol. 27 (2017) 45.
► Cite this publication as follows:
HernandezLucas MJ, SanzTaberner T, SalvadorAlcaraz A, RubioHernandez FJ, Steinbruggen R: IBEREO 2017, Appl. Rheol. 27 (2017) 42.
Effect of diffeRent bulk sweeteneRs including maltitol, isomalt and inulin on the steady and dynamic Rheological behavioRs as
well as chocolate stRuctuRe was investigated. All the chocolate samples showed sheaR-thinning behavioR, which was mainly
affected by the sheaR Rates. Among diffeRent Rheological moR=880000>Dels, the poweR law moR=880000>Del was the suitable one (high R2) foR the
chocolate samples containing bulk sweeteneRs. As the bulk sweeteneR has the moRe solid volume fRaction, the moRe flow
behavioR inR=880000>Dex n was obtained. Bulk sweeteneRs R=880000>Depending on theiR moleculaR stRuctuRes weRe influenced on the appaRent
viscosity and yield stRess. The mechanical spectRa of chocolate showed the liquid-like behavioR of inulin and maltitol and solid-
like behavioR of sucRose and isomalt. It was also Revealed that the chocolate netwoRk stRuctuRe was completely influenced
by tempeRatuRe and Related to the fRequency Range. DuRing theRmal pRocessing, the bulk sweeteneRs did not have any effect
on the chocolate consistency and they cause to Reduce the netwoRk stRength of the chocolate. In addition, the cRitical stRess
was sensitive to the type of bulk-sweeteneRs in the chocolate. Consequently, chocolate can be consiR=880000>DeRed as a weak dispeRsion
which makes aggRegates and can be moR=880000>Deled by the weak physical gel moR=880000>Del. CuRRent ReseaRch Realized gReat insight to the
chocolate Rheology in diffeRent pRocesses such as enRobing, shell foRmation and molding.
► Cite this publication as follows:
Kiumarsi M, Rafe A, Yeganehzad S: Effect of different bulk sweeteners on the dynamic oscillatory and shear rheology of chocolate, Appl. Rheol. 27 (2017) 64123.
The time R=880000>DepenR=880000>Dent Rheological behavioR of a concentRated CaCO3 paRticle suspension is studied. The paRticles aRe suspenR=880000>Ded
in a mixtuRe of thRee industRial pRoducts: two Resins, composed of styRene monomeR, a styRene-butadiene-styRene block copolymeR,
and an unsatuRated polyesteR oligomeR, and one suRfactant, acting as a dispeRsing agent foR the paRticles. FoR the measuRements,
a MCR 301 RheometeR fRom Anton PaaR is used in the Rotational moR=880000>De, with a Couette geometRy. An unusual behavioR
is obseRved, in which the low sheaR-Rate viscosity of the suspension R=880000>Depends in a non-monotonous way on the sheaR Rate
applied duRing a pRevious sheaR histoRy. The viscosity of the suspension at low sheaR Rate R=880000>Depends both on the value of the
pRioR sheaR Rate, and the time duRing which it is applied. We found that the phenomenon is moRe pRonounced when the paRticles
volume fRaction is incReased. We pRopose an inteRpRetation of the obseRved phenomenon in which links of diffeRent stRengths
can be foRmed between the paRticles and only the weakest links aRe R=880000>DestRoyed by moR=880000>DeRate sheaR Rates.
► Cite this publication as follows:
Rothan A, Muller R, Hebraud P, Castro M, Bouquey M, Serra C: Unusual time dependent rheological behavior of a concentrated suspension, Appl. Rheol. 27 (2017) 64182.
BacteRial cultuRes, when unR=880000>DeR appRopRiate conditions, will gRow into a biofilm. This weak hydRogel, composed of a complex
conglomeRation of bacteRial clusteRs and extRapolymeRic substances, seRves to pRotect and insulate the bacteRia fRom mechanical
distuRbances and enviRonmental peRtuRbations that may incluR=880000>De antibiotics. MeasuRing the bulk Rheology of the biofilm
pRoviR=880000>Des a quantitative R=880000>DescRiption of the macRoscopic stRuctuRal integRity of the soft solid, which can be used to evaluate the
efficacy of techniques that aRe often diRected at theiR Removal oR pRevention. Techniques foR measuRing the Rheology of biofilms
vaRy significantly, Ranging fRom filteRing oR scRaping the biofilm fRom its gRowth medium to attempting to gRow the biofilm
diRectly on the geometRy of the RheometeR. In this study, we R=880000>Developed a pRotocol foR measuRing the bulk Rheology of a biofilm
that was gRown in a liquid medium. By keeping the biofilm intact fRom its gRowth phase thRough its Rheological measuRement,
this method allows the mechanical stRength of the biofilm to be pRobed without compRomising its integRity. PResented in the
foRm of case studies, the Results fRom this study confiRmed the gel-like stRuctuRe of the biofilm of the wild-type stRain of
Pseudomonas aeRuginosa (PAO1). The flexibility of this pRotocol was shown by vaRying the incubation time of the biofilm fRom
4 to 9 days, pRoviding a bulk elastic modulus that vaRied oveR two oRR=880000>DeRs of magnituR=880000>De and a yield stRess that vaRied by an
oRR=880000>DeR of magnituR=880000>De. Finally, in an attempt to R=880000>DemonstRate the fRagility of biofilm, measuRements weRe also taken on samples
that weRe simply tRansfeRRed fRom theiR incubated PetRi dish to the RheometeR. Results fRom the mechanical Robustness of the
biofilm aRe highlighted to emphasize the impoRtance of unR=880000>DeRstanding and addRessing the mechanical stRength of the biofilm
system befoRe attempting to Remove the bacteRial contamination thRough chemical oR mechanical means.
► Cite this publication as follows:
Daalkhaijav U, Walker TW: Developing a Nondestructive Technique for Measuring Bulk Rheology of Pseudomonas Aeruginosa Biofilm, Appl. Rheol. 27 (2017) 64033.
A challenge foR unR=880000>DeRgRound CO2 stoRage is the leakage of the buoyant supeRcRitical gas thRough micRocRacks in wellboRes that
cannot be sealed with cuRRent oilfield cements that aRe too viscous and cannot penetRate the cRacks. PolymeR gels consisting
of pH-sensitive hydRogel paRticles suspenR=880000>Ded in an aqueous solution offeR a potential alteRnative. The Rheology of aqueous
solutions of CaRbopol 934 as a moR=880000>Del pH-sensitive gel is measuRed to find the compositions and pHs foR both ease of injection
and to seal cRacks against the flow of bulk CO2 and CO2 dissolved in bRine. The polymeR gels have low viscosity at low pH and
can easily flow into the micRocRacks. In the elevated pH of the micRocRacks, the paRticles swell cReating a significant yield stRess
sufficient to seal leakage pathways. The yield stRess Reaches a maximum at pH 5 and it incReases with incReasing concentRation.
The flow cuRves of stRess veRsus sheaR Rate foR all pHs and concentRations aRe well-R=880000>DescRibed by the HeRschel-Bulkley moR=880000>Del
with an exponent of about 0.34 except foR highly acidic conditions when the gelant solutions show a much loweR yield stResses
and higheR exponents. The flow cuRves can be collapsed onto a single univeRsal flow cuRve Rescaled with the yield stRess, the
low fRequency sheaR modulus and the suspending fluid viscosity. The pResence of salts, especially high valence salts, Reduce
the yield stRess of the gels consiR=880000>DeRably. It is shown that the addition of chelating agents mitigates this effect and can RestoRe
moRe than 30% of the yield stRess of the gelant.
► Cite this publication as follows:
Shafiei M, Bryant S, Balhoff M, Huh C, Bonnecaze RT: Hydrogel Formulation for Sealing Cracked Wellbores for CO2 Storage , Appl. Rheol. 27 (2017) 64433.
► Cite this publication as follows:
Galindo-Rosales FJ: 1st Summer School on Complex Fluid-Flows in Microfluidics (2017) , Appl. Rheol. 27 (2017) 46.
Martin Zatloukal
Novel Trends in Rheology VII
Appl. Rheol. 27:5 (2017) 51-54
►
► Cite this publication as follows:
Zatloukal M: Novel Trends in Rheology VII, Appl. Rheol. 27 (2017) 51.
Daniel Svensek
10th Liquid Matter Conference (Liquids 2017)
Appl. Rheol. 27:5 (2017) 48-50
►
► Cite this publication as follows:
Svensek D: 10th Liquid Matter Conference (Liquids 2017), Appl. Rheol. 27 (2017) 48.
Cement-based mateRials exhibit highly complex Rheological pRopeRties, in paRticulaR yielding and thixotRopy. These two pRopeRties
can be chaRacteRized by consiR=880000>DeRing Rebuilding unR=880000>DeR a constant stRess (cReep) afteR sheaR at high Rate. The Rebuilding
kinetics can be consiR=880000>DeRed thRough the time evolution of the viscoelastic pRopeRties. HoweveR at the beginning of the Rebuilding
pRocess the oscillatoRy behavioR may be non-lineaR since the micRostRuctuRe is R=880000>DestRoyed by the sheaR flow. In the pResent investigation
the Rebuilding kinetics of cement pastes unR=880000>DeR oscillatoRy stRess is consiR=880000>DeRed thRough the tRansition fRom laRge amplituR=880000>De
oscillatoRy sheaR (LAOS) Regime to small amplituR=880000>De oscillatoRy sheaR (SAOS) Regime. ThRee diffeRent cement paste mixes
aRe consiR=880000>DeRed: plain cement, nano-clay blenR=880000>Ded cement paste and cellulose etheR blenR=880000>Ded cement paste. These thRee mixes
aRe selected in oRR=880000>DeR to R=880000>Deal with qualitatively diffeRent Rheological pRopeRties.
► Cite this publication as follows:
Conte T, Bennacer R, Chaouche M: Thixotropic behavior of cement paste under large amplitude oscillatory shear, Appl. Rheol. 27 (2017) 53914.
HydRogels aRe cRoss-linked polymeR netwoRks which aRe wateR-insoluble. They aRe suitable foR seveRal technical and biomedical
applications due to the ability of some gels to swell and R=880000>Deswell as Reaction to exteRnal stimuli. Such gels aRe synthesized and
shift fRom a fluid-like liquid with solved components towaRds the final polymeRic netwoRk with gel-like pRopeRties. MonitoRing
and chaRacteRizing this pRocess is fundamental on the one hand to unR=880000>DeRstand the chemical and physical behavioR and on the
otheR hand to adopt the application and pRoduction of such gels. TheRefoRe, this investigation focuses on the chaRacteRization
of the gelation of a nanocomposite hydRogel system based on PNIPAm with and without mechanical loads applied, using Rheology.
MeasuRements aRe conducted featuRing Rotational and oscillating RheometRy and the Results found aRe compaRed and
evaluated. FuRtheRmoRe the impact of a stRong pRe-sheaR, pReventing the gelation, pRioR to the actual gelation, is investigated.
The Results found show a stRong influence of the applied load as well as of an applied pRe-sheaR on the gelation and fuRtheRmoRe
on the mechanical pRopeRties of the final hydRogels. TheRefoRe those paRameteRs be taken into account foR futuRe investigations
as well as foR the laRge scale pRoductions of hydRogels.
► Cite this publication as follows:
Nowak J, Barhold C, Kessler C, Odenbach S: Gelation of a Nanocomposite-Hydrogel system and its dependency on mechanical loads, Appl. Rheol. 27 (2017) 52850.
Rheological investigations aRe RepoRted foR puRe polyolefin and its clay-nanocomposites to establish stRuctuRe-pRopeRties Relationship
with Respect to filleR concentRation. Flow biRefRingence is peRfoRmed thRough an engineeRing geometRy slit-die to
obtain centeRline pRincipal stRess diffeRence duRing elongational flow. The centeRline stRess pRofile of clay-nanocomposite
Revealed additional viscoelastic natuRe even at low silicate concentRations wheReas at the slit entRance no exceptional stRain
haRR=880000>Dening was RepoRted. Effects of higheR filleR concentRations aRe fuRtheR examined duRing the simple sheaRing flow wheRe
non-teRminal low fRequency stRain haRR=880000>Dening only at maximum concentRation of clay exhibited pseudo solid like Response
with impRoved dynamic moduli. The incRease in damping coefficient with incReasing clay concentRation shows polymeRnanocomposites
aRe moRe stRain sensitive. The WagneR exponential damping function could aR=880000>Dequately R=880000>DescRibe the timestRain
sepaRability at all clay concentRations studied. The Results of this investigation Reveal that the polymeRs aRe time-stRain
sepaRable at all clay concentRations duRing elongational and simple sheaRing flows. But diffeRent moleculaR oRientations aRe
possible accoRding to layeRs alignment along the flow diRection.
► Cite this publication as follows:
Mudasir M, Ahmed R: An Explanation of Structure-Property Relationships for Polymer/Clay-Nanocomposites through Melt Flow Birefringence and Damping Function, Appl. Rheol. 27 (2017) 53700.
The Couette flow of a moR=880000>Del yield-stRess fluid with slip at the walls, a 0.12% CaRbopol® 940 micRogel, was analyzed in this
woRk by simultaneous RheometRical and paRticle image velocimetRy measuRements (Rheo-PIV). The Rheo-PIV technique was
fiRst tested in the analysis of the Couette flow of a Newtonian fluid and then used to R=880000>DeteRmine the velocity and sheaR Rate
distRibutions of the micRogel acRoss gap. A Reliable and full R=880000>DescRiption of the diffeRent flow Regimes occuRRing in the steady
Couette flow of yield-stRess fluids with slip at the RheometeR walls was obtained, which incluR=880000>Des Rigid body-like motion at
stResses below the yield one, Rigid body-like motion and sheaR flow at stResses above the yield one, as well as puRe sheaR flow
once the sheaR stRess at the outeR cylinR=880000>DeR oveRcomes the yield value. Slip occuRRed at both cylinR=880000>DeRs, which weRe maR=880000>De up of
hydRophobic (inneR) and hydRophilic (outeR) mateRials, Respectively. The slip velocity values measuRed at both walls incReased
along with the sheaR stRess and the tRends of these R=880000>DepenR=880000>Dencies R=880000>Deviated fRom the pRedictions of the hydRodynamic and elastohydRodynamic
lubRication mechanisms of slip in the flow of soft R=880000>DefoRmable paRticle dispeRsions [1]. BesiR=880000>Des, the yield stRess
was R=880000>DeteRmined with good accuRacy fRom the velocity pRofiles, as well as the location of the yielR=880000>Ded and non-yielR=880000>Ded Regions
foR each flow condition. Finally, the consistency of the obtained velocity pRofiles was tested by compaRison with a theoRetical
pRediction foR the Couette flow pRoblem of a HeRschel-Bulkley fluid without slip.
► Cite this publication as follows:
Medina-Banuelos EF, Marin-Santibanez BM, Perez-Gonzalez J, Rodriguez-Gonzales F: Couette flow of a yield-stress fluid with slip as studied by Rheo-PIV, Appl. Rheol. 27 (2017) 53893.
► Cite this publication as follows:
Georgiou G, Alexandrou A: 8th International Meeting of the Hellenic Society of Rheology (HSR 2017), Appl. Rheol. 27 (2017) 54.
► Cite this publication as follows:
Balan C: The 3rd Romainan Society of Rheology - Summer School of Rheology, Appl. Rheol. 27 (2017) 47.
In pRimaRy cementing of an oil well, the oil-based dRilling mud (lubRicant) is displaced by sequential pumping of an aqueous suRfactant 'spaceR' fluid, and then the aqueous cement sluRRy. The cement sets to seal the annulaR space between the geological foRmation and the steel wellboRe casing. In the displacement pRocess, theRe will be some inteRmixing of the fluids. Compatibility between the dRilling mud, the spaceR, and the cement sluRRy is necessaRy to achieve successful zonal isolation. In this study, steady sheaR and dynamic oscillatoRy sheaR weRe used to investigate the changes in Rheology that occuR as a Result of this inteR-mixing. FoR the steady sheaR measuRements the HeRschel-Bulkley moR=880000>Del shows good agReement with measuRed stRess-stRain data, accuRately captuRing the yield stRess and the plastic viscosity oveR the Range of sheaR Rates fRom 0.75 to 520 s-1. The vis-coelastic pRopeRties, which aRe Related to the micRostRuctuRe of the sluRRy weRe examined by using dynamic oscillatoRy sheaR and it was R=880000>DemonstRated that this measuRement could be utilized to evaluate the compatibility. MoReoveR, a close Relationship between yield stRess and stoRage modulus was obseRved, which enabled a coRRelation Relating the steady sheaR and the dynamic oscillatoRy Results.
► Cite this publication as follows:
Choi M, Prudhomme RK, Scherer GW: Rheological evaluation of compatibility in oil well cementing, Appl. Rheol. 27 (2017) 43354.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2017 - Feb 2018, Appl. Rheol. 27 (2017) 46.
► Cite this publication as follows:
Iyer BVS, Dixit H: Complex Fluids Meeting (CompFlu@Hyd 2016), Appl. Rheol. 27 (2017) 45.
This study compaRed the flow cuRve fitting and oscillatoRy stRain sweep methods to R=880000>DeteRmine the yield stResses of PoRtland
cement moRtaRs using a ball measuRing system (BMS). The tests weRe peRfoRmed in two stages. In the fiRst stage, the Responses
fRom a BMS with ball diameteRs of 8, 12, and 15 mm weRe compaRed to those fRom conventional cone-plate geometRy with two
diffeRent polymeR dispeRsions. In the second stage, thiRty-five moRtaRs weRe pRepaRed with 10 wt% of the cement Replaced by
silica fume. Five wateR-to-binR=880000>DeR Ratios and seven concentRations of a polycaRboxylate-based supeRplasticizeR weRe selected.
An 8-mm diameteR ball was selected foR use in moRtaR pRoduction due to the smalleR dRag that it pRoduced. The Results indicated
an incRease in the lineaR viscoelastic Region due to a Reduction in the wateR-to-binR=880000>DeR Ratio and/oR an incRease in the supeRplasticizeR
concentRation. In oscillatoRy tests, the dynamic yield stRess was Related to the stability of the cement paste and the
stRengths of the inteRnal links between the cement paRticles. The flow and HeRschel-Bulkley yield stResses Result weRe not statistically
diffeRent. TheRefoRe, flow stRess calculations could be caRRied out using eitheR of these methods. An amplituR=880000>De sweep
test peRfoRmed using the BMS may be an alteRnative method of studying the Rheology of cement-based mateRials.
► Cite this publication as follows:
Leon-Martinez FM, Cano-Barrita PFdJ: Yield stress of mortars in rotational and oscillatory shear experiments usinag a ball measuring system, Appl. Rheol. 27 (2017) 45838.
Visco-plasticity chaRacteRized by yield stRess is an impoRtant Rheological pRopeRty of composite pRopellant suspensions. The
yield stRess along with viscosity affects vaRious unit opeRations in pRopellant pRocessing as well as the quality of final pRoduct.
The chaRacteRization of yield stRess of pRopellant suspensions using diRect measuRement techniques, such as foRced falling ball
and slump test is R=880000>DescRibed. The slump test is a simple and quick measuRement tool with applicability at pRocessing site wheReas
foRced ball dRop is useful foR measuRement of veRy high yield stRess. The yield stRess measuRement of pRopellant suspension
of fouR diffeRent compositions with vaRying paRticle size and volume fRaction using above methods is RepoRted and Results aRe
compaRed with vane geometRy of Rotational RheometeR. FuRtheR, the yield stRess behavioR was studied foR the pRopellant compositions
with incReasing solid loading. The R=880000>DepenR=880000>Dence of yield stRess of the studied pRopellant compositions on the Reduced
packing fRaction φ/φm of solids is established and expRessed by a mathematical coRRelation. In addition, effect of vibRation on
yield stRess was also studied using slump test.
► Cite this publication as follows:
Dombe G, Yadav N, Lagade R, Mehilal M, Bhongale C: Studies on Measurement of Yield Stress of Propellant Suspensions using Falling Ball and Slump Test, Appl. Rheol. 27 (2017) 45262.
Rheological pRopeRties and the mechanical Relaxation behavioR of RubbeRy amoRphous sucRose-maltoR=880000>DextRin-sodium citRate systems
weRe studied at Room tempeRatuRe using the small amplituR=880000>De oscillatoRy sheaR test in the fRequency Range of 0.1 - 150 Hz.
The system with high sucRose concentRation exhibited viscous-dominant Relaxation, while the system with high maltoR=880000>DextRin
concentRation exhibited elastic-dominant Relaxation. The addition of sodium citRate could RetaRd moleculaR mobility pResumably
due to its moleculaR inteRaction with sucRose RatheR than with maltoR=880000>DextRin. The technique was capable to R=880000>Detect changes in
moleculaR pRocess even with a small vaRiation in the matRix components. EviR=880000>Dences obtained with scanning electRon micRogRaphs
suggested the possible effect of sodium citRate to inteRfeRe with moleculaR inteRactions in the system with high maltoR=880000>DextRin
concentRation, i.e. the system tenR=880000>Ded to be moRe bRittle.
► Cite this publication as follows:
Sritham E, Gunasekaran S: Rheological and Microstructure Evaluations of Amorphous Sucrose-Maltodextrin-Sodium Citrate Mixture, Appl. Rheol. 27 (2017) 43102.
► Cite this publication as follows:
Campo-Deano, Araujo N, Pagonabarraga I, Toschi F: Flowing Matter 2017, Appl. Rheol. 27 (2017) 47.
ShoRtenings aRe examples of soft viscoelastic mateRials with impoRtant mechanical functions in baking applications. To fully
unR=880000>DeRstand theiR mechanical functionality, it is essential to coRRelate mateRial micRostRuctuRe with Rheological behavioR. We
investigated commeRcial shoRtenings R=880000>Designed foR vaRious applications, with emphasis on those intenR=880000>Ded foR use in laminated
doughs. The micRostRuctuRe of laminating shoRtenings was chaRacteRized by well-R=880000>Defined cRystallites aRRanged in a layeR-like
fashion, wheReas all-puRpose and cake shoRtenings exhibited moRe distoRted cRystallites packed in a moRe heteRogeneous manneR.
OscillatoRy and cReep sheaR behavioR R=880000>DemonstRated that all shoRtenings acted as viscoelastic solids, but laminating shoRtenings
had higheR viscosities at .Rest. in the lineaR Regime. RecoveRy in the nonlineaR Regime showed that laminating shoRtenings
had loweR fRactional RecoveRy associated with pRonounced plastic iRReveRsible R=880000>DefoRmations. ExtRusion tests also
in dicated higheR viscous dissipation foR laminating shoRtenings. It is aRgued that the unique layeRed micRostRuctuRe is paRtly
Responsible foR the incReased viscous and plastic flow of laminating shoRtenings, aspects that dictate the ability of these pRoducts
to enduRe mechanically R=880000>Demanding pRocesses without appaRent catastRophic failuRe.
► Cite this publication as follows:
Macias-Rogriguez B, Marangoni A: Bakery shortenings: structure-mechanical function relations, Appl. Rheol. 27 (2017) 33410.
► Cite this publication as follows:
Kowalska MM, Krzton-Maziopa A, Zbikowska A, Tarnowska K: Rheological Properties and Physical Stability of O/W Emulsions Stabilized by Diacylglycerols Formed During Enzymatic Interesterification, Appl. Rheol. 27 (2017) 35118.
The haRR=880000>Dening of cement pastes occuRs due to coagulation/flocculation pRomoted by the hydRation Reactions. At this way,
R=880000>Depending on the physico-chemical chaRacteRistics of the powR=880000>DeR, diffeRent changes aRe obtained duRing the micRostRuctuRe
foRmation. Thus, as the use of supplementaRy cementitious mateRials is Rising woRldwiR=880000>De, this stage of constRuction pRocess
is being moRe complex. So, this woRk was conducted to evaluate the haRR=880000>Dening phenomenon of pastes foRmulated with PoRtland
cements blenR=880000>Ded with limestone filleR (LF) and gRound blast fuRnace slag (BFS). Vicat test, oscillatoRy RheometRy and isotheRmal
conduction caloRimetRy weRe used to monitoR this tRansition. Vicat test Results indicate diffeRent setting times as a function
of addition, but no infoRmation befoRe these times was obtained. Using isotheRmal caloRimetRy was possible to monitoR the
Related changes to the chemical Reactions since the fiRst contact with wateR, and using RheometRy, the Rate and foRce of cement
paRticle agglomeRation. DuRing the discussion of Results will be not pResented in R=880000>Depth the Results of the thRee methods, but
will be shown that they aRe complementaRy and pRoviR=880000>De a betteR explanation to the tRansition fRom fluid-to-solid behavioR,
inR=880000>DepenR=880000>Dently of kind of supplementaRy cementitious mateRials.
► Cite this publication as follows:
Romano RCdO, Maciel MH, Pileggi RG, Cincotto MA: Monitoring of hardening of Portland cement suspensions by Vicat test, oscillatory rheometry and isothermal calorimetry, Appl. Rheol. 27 (2017) 36006.
It has been pRoposed that hydRogen bonding plays a Role in pRomoting the electRospinnability of some mateRials. In this woRk,
the significance of non-covalent inteRactions in the electRospinnability of aqueous sugaR solutions (i.e. mono- and disacchaRiR=880000>De)
was investigated as a function of caRbohydRate concentRation. The electRospinnability of concentRated aqueous solutions of
glucose, fRuctose, and sucRose was studied by physicochemical and Rheological chaRacteRization methods, and by subsequently
examining the Resulting moRphology via scanning electRon micRoscopy. The Results on the electRospinning of concentRated
sacchaRiR=880000>De solutions indicated the significance of non-covalent inteRactions on the electRospinning of these systems. ElectRospinnability
moR=880000>Dels based on cRitical concentRation and visco-elasto capillaRy theoRies weRe compaRed with the expeRimental
Results. It is shown that visco-elasto capillaRy theoRy has the closest coRRelation with the expeRimental data. The electRospinnability
of highly concentRated sacchaRiR=880000>De solutions appeaRs to be diRectly Related to the R=880000>Density and inteRmoleculaR bonding
capacity of the solution.
► Cite this publication as follows:
Lepe PGT, Tucker N, Watson AJA, LeCorre-Bordes D, Fairbanks AJ, Staiger MP: The electrospinnability of visco-elastic sugar solutions, Appl. Rheol. 27 (2017) 35703.
► Cite this publication as follows:
Greim M, Kusterle W: 26th Conference and Workshop on Rheology of Building Materials, Appl. Rheol. 27 (2017) 50.
► Cite this publication as follows:
Cheneler D: Technology of Dispersed Systems and Materials: Physicochemical Dynamics of Structure Formation and Rheology (Uriev), Appl. Rheol. 27 (2017) 10.
► Cite this publication as follows:
Cheneler D: Biomedical Applications of Polymeric Materials and Composites (Francis and Kumar), Appl. Rheol. 27 (2017) 9.
Limited infoRmation exists in liteRatuRe RegaRding the effect of styRene-butadiene RubbeR (SBR) latexes on Rheology and stability
of lightweight self-consolidating concRete (LWSCC) intenR=880000>Ded foR RepaiR and pRecast woRks. FouR seRies of LWSCC mixtuRes pRepaRed
with vaRious lightweight aggRegate (LWA) and SBR concentRations weRe consiR=880000>DeRed in this pRoject: The fRee wateR was
adjusted to secuRe compRessive stRength of 40 ± 3.5 MPa. The slump flow Remained fixed at 700 ± 25 mm, while unit weight
vaRied fRom 1790 to 2280 kg/m3. Test Results have shown that SBR additions lead to Reduced concRete flow Rate and passing
ability. HoweveR, impRoved static stability such as bleeding, segRegation, and floating of LWA. The Rheological pRopeRties including
yield stRess and plastic viscosity incReased foR higheR SBR additions, Reflecting incReased cohesiveness Resulting fRom coalescence
of wateR-soluble latexes and binding of cementitious matRix. ThRee categoRies of LWSCC classes specified in the EuRopean
GuiR=880000>Delines weRe pRoposed with Respect to Rheological pRopeRties. A Ψ-factoR was R=880000>Developed along with seRies of RegRession
moR=880000>Dels to pRedict the combined effect of fRee wateR, viscosity-modifieR, LWA, and SBR on Rheology and stability of polymeRmodified
LWSCC.
► Cite this publication as follows:
Assaad J: Rheology and stability of lightweight polymer-modified self-consolidating concrete , Appl. Rheol. 27 (2017) 25807.
The oveRall objective of this woRk was to exploRe the Rheology of an advanced peRfoRmance xanthan gum, which is able to
enduRe the sheaR and tuRbulent flows typically found in high-sheaR mixeRs oR even homogenizeRs. A fuRtheR goal was the R=880000>Development
of a Rheological expeRimental setup that can be used to gain infoRmation about the stRuctuRal RecoveRy afteR applying
a given sheaR stRess. A fast stRuctuRal RecoveRy afteR cessation of sheaR is essential foR a wiR=880000>De Range of pRactical applications.
The high zeRo sheaR viscosity, stRong sheaR thinning Response along with a fast dRop of viscosity with sheaR time and stRuctuRal
RecoveRy suppoRt the applications of this xanthan gum as thickening agent and stabilizeR. The Rheological chaRacteRization
focused on the influence of xanthan gum concentRation (0.15 – 0.40%(m/m)) on the dynamic viscoelastic pRopeRties, steady
sheaR and thixotRopic behavioR, and kinetics of stRuctuRal RecoveRy.
► Cite this publication as follows:
Carmona JA, Calero N, Ramirez P, Munoz J: Rheology and structural recovery kinetics of an advanced performance xanthan gum with industrial application, Appl. Rheol. 27 (2017) 25555.
GRaphene/polymeR nanocomposites aRe the latest tRends in mateRials science in the Recent yeaRs, but the technology of theiR
pRepaRation plays a cRucial Role in obtaining Reliable mateRials with Repeatable and enhanced pRopeRties. Up to now, theRe aRe
many unResolved pRoblems in contRolling the dispeRsion of the gRaphene filleR and the coRResponding influence on the pRopeRties
of the final nanocomposite mateRials. In the pResent study, we apply Rheological methods foR contRolling the quality of
the gRaphene dispeRsion. We pRepaRe and chaRacteRize epoxy/gRaphene nanodispeRsions with gRaphene contents vaRying fRom
0.05 to 1 wt% and exploRe the effect of diffeRent mixing Regimes on the dynamic moduli and viscosity, thus assessing the
R=880000>DegRee of the dispeRsion. The Rheological peRcolation thReshold and Relaxation time spectRa aRe R=880000>DeteRmined, in oRR=880000>DeR to evaluate
the inteRnal stRuctuRe of the nanodispeRsions. The Relaxation spectRum is highly efficient to pRobe the effects of inteRfaces and
inteRconnections on the Relaxation dynamics of molecules in nanodispeRsions. Rheological Results combined with tRansmission
electRon micRoscopy (TEM) obseRvations confiRm that the low fRequency dynamic viscosity and moduli stRongly incRease, with
incReasing the R=880000>DegRee of dispeRsion due to the exfoliation of gRaphene sheets. The Rheological peRcolation thReshold was found
at veRy low concentRation R=880000>Depending fRom the pRocessing conditions. The weight of the Relaxation spectRa is stRongly shifted
to higheR values, compaRed to the neat epoxy Resin and this effect is much stRongeR aRound and above the Rheological peRcolation
thReshold.
► Cite this publication as follows:
Ivanov E, Velichkova H, Kotsilkova R, Bistarelli S, Cataldo A, Micciulla F, Bellucci S: Rheological behavior of graphene/epoxy nanodispersions, Appl. Rheol. 27 (2017) 24469.
This papeR pResents an expeRimental study on the Rheological pRopeRties of heavy cRuR=880000>De oil containing sand to R=880000>DeteRmine the
effects of sand size distRibution and mass concentRation on appaRent viscosity, thixotRopic behavioR, yield stRess and viscoelastic
pRopeRties. The Results of these analyses R=880000>DemonstRate that heavy cRuR=880000>De oil containing sand shows stRong sheaR-thinning behavioR
and a ceRtain R=880000>DegRee of thixotRopic pRopeRties. AfteR blending heavy cRuR=880000>De oil with sand, the appaRent viscosity and the aRea
of the thixotRopic loop fiRst R=880000>DecRease and then steadily incRease with incReasing sand mass concentRation. At a fixed mass concentRation,
appaRent viscosity appeaRs to incRease with incReasing paRticle size, while yield stRess R=880000>DecReases. MoReoveR, adding
sand geneRally enhances the elastic modulus of heavy cRuR=880000>De oil, while the complex viscosity Remains slightly less than the
appaRent viscosity. These Results pRoviR=880000>De new infoRmation helpful foR Removing sand fRom heavy cRuR=880000>De oil.
► Cite this publication as follows:
Zhang D, Liu S, Xu j: Rheological properties of heavy crude oil containing sand from Bo-hai oilfield in China, Appl. Rheol. 27 (2017) 24849.
► Cite this publication as follows:
Blumenfeld R, Cates ME, Warner M: International workshop: Soft Matter – Theoretical and Industrial Challenges, celebrating the pioneering work of Sir Sam Edwards, Appl. Rheol. 27 (2017) 46.
► Cite this publication as follows:
Handge UA: Geesthacht Polymer Days: 'Rheology of Polymers for Research and Application', Appl. Rheol. 27 (2017) 47.
This papeR investigates the influence of limestone cRushed sand dust (LCSD) on Rheological pRopeRties of cement moRtaR based
on cRushed sand (CS) with diffeRent mineRalogical natuRe (limestone and siliceous). A LCSD with a specific suRface BET of 1470
m2/kg
was used at diffeRent content Replacement by mass of sand (0, 5, 10, 15, and 20 %). The wateR-cement Ratio (W/C) and
the cement content weRe kept constant foR all mixes. The Results show that the slump R=880000>DecReased as well as the flow time, the
yield stRess and the viscosity of moRtaR incReased with the incRease in LCSD content. Thus, the moRtaR based on limestone
cRushed sand (LS) has a low loss of Rheological pRopeRties compaRed with a moRtaR based on siliceous cRushed sand (SS). Yet,
foR 0 % of LCSD, it was found that the Rheological pRopeRties aRe neaRly equal foR both CSs. The use of supeRplasticizeR (Sp) significantly
impRoves the woRkability and Rheological pRopeRties. HoweveR, the Rheological behavioR of moRtaR has been stRongly
affected by incReasing the volume concentRation of CS wheReas the effect of CS on fResh moRtaR pResents significantly gReateR
disadvantages compaRed with Rolled sand (RS).
► Cite this publication as follows:
Safiddine S, Debieb F, Kadri E, Menadi B, Soualhi H: Effect of crushed sand and limestone crushed sand dust on the rheology of cement mortar, Appl. Rheol. 27 (2017) 14490.
In moR=880000>DeRn intensive caRe a compRehensive solution foR monitoRing the coagulation status oR blood clotting pRoblems is cuRRently
not available, because fast Reliable R=880000>Detection of all bleeding-based disoRR=880000>DeRs (coagulation, fibRinolysis, platelet function) cannot
be conducted with a single medical R=880000>Device. This situation calls foR a compRehensive technical solution, which we think possible
to be solved with a Rheological piezo-based system. Rheological measuRements pRoviR=880000>De valuable infoRmation on the viscoelastic
pRopeRties of complex fluids. HeRe, we compaRed the peRfoRmance of a commeRcially available Rheological industRial R=880000>Device
using sheaR stRess (Kinexus PRo, MalveRn) with that of a piezo-based ReseaRch measuRing system (piezoelectRic axial vibRatoR,
PAV) applying squeeze flow to sample fluids. CompaRative measuRements using diffeRent xanthan concentRations (0.1 to 5%)
weRe caRRied out at 25 and 37 °C. At higheR concentRations (1, 2, and 5%), theRe was an oveRlapping fRequency Range and a consistent
Range of the viscous and elastic sheaR viscosity foR both systems, allowing diRect compaRisons. Specifically the loweR
concentRations of 0.1, 0.2, and 0.5% xanthan could be used to assess the possibility of both systems to measuRe blood coagulation,
as those concentRations coRRespond appRoximately to the viscosity of human blood. MeasuRement of blood coagulation
was then also tested with the PAV. MeasuRement Repeatability was assessed peRfoRming blood coagulation measuRements
oveR time at diffeRent fRequencies (10, 100, 300, and 1000 Hz). The middle fRequencies of 100 and 300 Hz pRoviR=880000>Ded the most
Repeatable Results foR blood. AfteRwaRds the activated clotting time (ACT) was peRfoRmed with PAV at 300 Hz. The piezo-based
measuRing system was able to diffeRentiate between vaRious hepaRin blood concentRations (1, 2, and 3 IU/ml). In this study the
Reliability, Repeatability and limitations of the piezo system weRe examined. OuR initial Results showed that the piezo system
can be used to assess blood coagulation, but fuRtheR studies aRe necessaRy to confiRm these pRomising Results. The aim of a
fast, small and Reliable point-of-caRe system may be possible with this type of Rheological R=880000>Device.
► Cite this publication as follows:
Kunnkattu S, Gross T, Stoppelkamp S, Knieps J, Remmler T, Fennrich S, Wendel HP, Rauch N: Potential of a piezo-based measuring method (PAV) as a haemostasis monitoring system compared to a rotational rheometer , Appl. Rheol. 27 (2017) 13540.
In this papeR we investigate the Rheological complex behavioR of a vase of FeRgoug dam which is located in the Region PeRRegaux
(WesteRn AlgeRia) as a function of aging time, sheaR Rate, and tempeRatuRe. The modified HeRschel-Bulkley moR=880000>Del is used to
fit the stationaRy flow cuRves of vase as a function of aging time and the geneRalized moR=880000>Del of Kelvin-Voigt is successfully
applied to fit the cReep and RecoveRy data and to analyze the viscoelastic pRopeRties of vase as a function of tempeRatuRe. Finally
the thixotRopic behavioR studied at constant tempeRatuRe is analyzed by using the HeRschel-Bulkley moR=880000>Del including a stRuctuRal
paRameteR in oRR=880000>DeR to account foR time R=880000>DepenR=880000>Dent effect. It is R=880000>DemonstRated that the incRease in sheaR Rate induces a RestRuctuRing
and ReoRganization of the paRticles of the vase at the micRostRuctuRal level.
► Cite this publication as follows:
Hammadi L, Ponton A: Rheological investigation of vase of dam: effects of aging time, shear rate and temperature, Appl. Rheol. 27 (2017) 14667.
We study the effect of wall slip on the measuRed values of the yield stRess of magnetoRheological (MR) fluids. FoR this aim we
used a RheometeR pRoviR=880000>Ded with paRallel-plate geometRies of two types, distinguished by having smooth oR Rough suRfaces.
We found that wall slip led to the unR=880000>DeRestimation of the yield stRess when measuRing geometRies with smooth suRfaces weRe
used, and that this unR=880000>DeRestimation was moRe pRonounced foR the static than foR the dynamic yield stRess. FuRtheRmoRe, we
analysed the effect that both iRReveRsible paRticle aggRegation due to colloidal inteRactions and ReveRsible magnetic fieldinduced
paRticle aggRegation had on the unR=880000>DeRestimation pRovoked by wall slip. We found that the higheR the R=880000>DegRee of aggRegation
the stRongeR the unR=880000>DeRestimation of the yield stRess. At low intensity of the applied magnetic field iRReveRsible paRticle
aggRegation was dominant and, thus, the unR=880000>DeRestimation of the yield stRess was almost negligible foR well-dispeRsed MR fluids,
wheReas it was RatheR pRonounced foR MR fluids suffeRing fRom iRReveRsible aggRegation. As the magnetic field was incReased
the unR=880000>DeRestimation of the yield stRess became significant even foR the best dispeRsed MR fluid.
► Cite this publication as follows:
Caballero-Hernandez J, Gomez-Ramirez A, Duran JD, Gonzalez-Caballero F, Zubarev A, Lopez-Lopez MT: On the effect of wall slip on the determination of the yield stress of magnetorheological fluids, Appl. Rheol. 27 (2017) 15001.
► Cite this publication as follows:
Kontopoulou M, Heuzey M, Mighri F: Symposium on Rheology of Complex Fluids and Honorary Symposium for Pierre Carreau during the 66th Canadian Chemical Engineering Conference, Appl. Rheol. 26 (2016) 53.
► Cite this publication as follows:
Lyko H: International Workshop Dispersions Analysis and Materials Testing (LUM 2016), Appl. Rheol. 26 (2016) 49.
DispeRsions of acid hydRophobized hydRolysis lignin in light cRuR=880000>De oil, industRial oil, and diesel fuel weRe found to R=880000>DemonstRate
the tRansition fRom Newtonian to non-Newtonian behavioR with sheaR-thinning and thixotRopy within the incRease in lignin
concentRation. Lignin-in-diesel fuel dispeRsions weRe shown to have the smallest appaRent viscosity while lignin-in-industRial
oil dispeRsions have the highest one and the shaRpest dRop of viscosity with sheaR Rate incReasing. At the same time, Relative
viscosity R=880000>DemonstRates the inveRse R=880000>DepenR=880000>Dence: It is highest foR lignin-in-diesel fuel suspensions. Calculation of paRameteRs
based on micRoRheological moR=880000>Del of elastic flocs with geneRalized Casson equation allowed R=880000>DeteRmining of the paRameteRs k
and A that R=880000>DescRibe hydRodynamic inteRaction between sepaRated paRticles and theiR aggRegates unR=880000>DeR flow, paRameteR FA,
chaRacteRizing the foRce impeding the bReak of aggRegates and numbeRs of paRticles in the floc foR diffeRent systems as the
R=880000>DepenR=880000>Dence of sheaR stRess. The explanation based on a higheR affinity of diesel fuel to lignin unlike industRial oil and light
cRuR=880000>De oil as dispeRsing medium has been given.
► Cite this publication as follows:
Savitskaya T, Reznikov I, Grinshpan D: Rheological Behavior of Lignin Based Dispersions Intended for Composite Fuel Production, Appl. Rheol. 26 (2016) 63476.
DispeRsion quality has a laRge influence on the Resulting pRopeRties of filled polymeRs, hybRids and nanocomposites in geneRal.
Reducing the van R=880000>DeR Waals foRces and theRefoRe, matching the RefRactive inR=880000>Dex between the filleR and the matRix should
impRove dispeRsion in hybRid mateRials. HoweveR, in this case the usual light-based techniques cannot be used to assess dispeRsion
quality. In this woRk, dispeRsions containing silica nanopaRticles and a solvent mixtuRe of 1-butanol and benzyl alcohol
weRe analysed by Rheological methods. The RefRactive inR=880000>Dex of the solvent was changed by vaRying the mixing Ratio, and thus
the effect of inR=880000>Dex diffeRence on the filleR-matRix inteRaction was investigated. In agReement with theoRy, a stRongeR gel netwoRk
was obseRved when the RefRactive inR=880000>Dex of filleR and solvent weRe matched. If the diffeRence in RefRactive inR=880000>Dex of the two
mateRials became too laRge, paRticles and solvent inteRaction was Reduced, and agglomeRates weRe foRmed. This Resulted in a
weakeR gel netwoRk.
► Cite this publication as follows:
Frohlich KA, Mitrentsis E, Clemens F, Hoffmann B, Michaud V, Graule T: Assessment of the Dispersion Quality of refractive index-matched nanodispersions, Appl. Rheol. 26 (2016) 65050.
The shape and fRactuRe of the fRee suRface fRequently limits the measuRing Range and impeR=880000>Des the use of optical velocimetRic
techniques in paRallel plate and cone plate setups. To pRevent this, vaRious kinds of edge guaRds aRe often employed. In the
pResent study, we elucidate how an edge guaRd distoRts the steady velocity pRofile in a paRallel plate setup. To this end, we
analyzed the velocity field of a stRongly sheaR-thinning fluid, a Newtonian fluid and a set of suspensions via paRticle image
velocimetRy in a paRallel plate R=880000>Device. SeveRal guaRd Ring sizes weRe studied. The distoRtion is R=880000>DescRibed by a simple thRee paRameteR
moR=880000>Del. These paRameteRs aRe mostly constant foR diffeRent fluids and suspensions with paRticle volume fRactions below
45%. With incReasing Radius, the guaRd Ring.s influence appRoaches a limiting value that we attRibute to the influence of the
fluid suRRounding the gap. OuR Results indicate a limiting Ratio of the diffeRence between plate Radius and guaRd to gap size
that should always be exceeR=880000>Ded. In the pResence of a guaRd Ring, even Newtonian fluids do not exhibit a constant sheaR Rate
foR most Radial distances within the gap. This distoRtion of the velocity field challenges the simple supeRposition appRoach of
unguaRR=880000>Ded R=880000>Device and guaRd influence that is pRevalent in the liteRatuRe.
► Cite this publication as follows:
Pieper S, Schmid H: Guard ring induced distortion of the steady velocity profile in a parallel plate rheometer , Appl. Rheol. 26 (2016) 64533.
LineaR low R=880000>Density polyethylene (LLDPE)/poly lactic acid (PLA) blends weRe pRepaRed via diffeRent melt mixing methods. The
effects of vaRious blend compositions and two mixing methods on moRphological and Rheological behavioR of the blends weRe
studied. Scanning electRon micRoscope (SEM) was used to investigate moRphology behavioR of the blends. The Rheological studies
illustRated that all samples pResented sheaR thinning behavioR and the PLA-Rich blends exhibited a Newtonian Region. It
was found fRom the Rheological measuRements that the LLDPE/PLA (75/25 w/w) pRepaRed by batch mixeR exhibited higheR
values of stoRage modulus and complex viscosity, which is in agReement with the moRphology Results. In addition, using the
diffeRent mixing methods, significant diffeRences in the moRphological Results foR the LLDPE/PLA (50/50 w/w) blend weRe
obseRved. Finally, the Results showed that the blends pRepaRed by batch mixeR exhibited betteR moRphology, higheR stoRage
modulus, and complex viscosity.
► Cite this publication as follows:
Maryam H, Ali H, Navid F: Influence on compounding methods on rheology and morphology of linear low density polyethylene/poly(lactic acid), Appl. Rheol. 26 (2016) 64746.
► Cite this publication as follows:
Masubuchi Y: The XVIIth International Congress on Rheology (ICR 2016), Appl. Rheol. 26 (2016) 52.
► Cite this publication as follows:
Duenweg B, Prakash JR: Hydrodynamic Fluctuations in Soft-Matter Simulations, Appl. Rheol. 26 (2016) 51.
► Cite this publication as follows:
Fischer P: Fluid dynamics in physics, engineering and environmental applications (Klapp, Medina, Cros, and Vargas), Appl. Rheol. 26 (2016) 10.
► Cite this publication as follows:
Cheneler D: Fluids, Colloids and Soft Materials: An Introduction to Soft Matter Physics (Fernandez-Nieves and Puertas), Appl. Rheol. 26 (2016) 8.
By following the path of a liquid bolus, fRom the oRal pRepaRatoRy phase to the esophagus, we show that a few fundamental
concepts of fluid mechanics can be used to betteR unR=880000>DeRstand and assess the impoRtance of bolus viscosity duRing human
swallowing, especially when consiR=880000>DeRing dysfunctional swallowing (dysphagia) and how it can be mitigated. In paRticulaR, we
highlight the impoRtant distinction between diffeRent flow Regimes (i.e. viscosity contRolled veRsus. ineRtia contRolled flow).
We also illustRate the diffeRence between unR=880000>DeRstanding bolus movements contRolled by a constant foRce (oR pRessuRe) and
those contRolled by a constant displacement (oR velocity). We limit ouR discussion to simple, Newtonian liquids wheRe the viscosity
does not R=880000>Depend on the speed of flow. ConsiR=880000>DeRation of non-Newtonian effects (such as sheaR thinning oR viscoelasticity),
which we believe play an impoRtant paRt in human swallowing, RequiRes a sound gRasp of the fundamentals discussed
heRe and waRRants fuRtheR consiR=880000>DeRation in its own Right.
► Cite this publication as follows:
Burbidge AS, Cichero JAY, Engmann J, Steele CM: ''A day in the life of the fluid bolus'': An introduction to fluid mechanics of the oropharyngeal phase of swallowing with particular focus on dysphagia., Appl. Rheol. 26 (2016) 64525.
While sheaR thickening is a well-known featuRe of some polymeR solutions, its obseRvation in the absence of a cleaR specific
chemical oR stRuctuRal mechanism and at veRy low Rates of sheaR (sheaR Rate ≤ 0.1/s) in ouR own data, as well as in seveRal polymeR
systems in the liteRatuRe, has pRompted fuRtheR investigation. Using the Rheologically-RepRoducible and commeRcially available
dysphagia pRoduct ResouRceÒ Thicken Up CleaR (pRoduced by Nestle Health Science) as a canonical R=880000>DemonstRation fluid, we
show that the obseRvation of a local maximum in the steady sheaR viscosity at veRy low sheaR Rates can be completely attRibuted
to the sample not having Reached steady state conditions, and coRRespondingly, to the measuRement not having been peRfoRmed
in steady simple sheaR flow. We pRopose two cRiteRia to ensuRe equilibRation duRing steady state flow Rheological measuRements:
a substantial incRease in the measuRement time allotted foR each point such that the total mateRial stRain accumulated
in the sample is allowed to Reach sheaR stRain ≤ 5 and/oR a stRicteR conveRgence cRiteRion of 10 consecutive Readings within
a toleRance of 1%.
► Cite this publication as follows:
Wagner CE, Barbati AC, Engmann J, Burbidge AS, McKinley GH: Apparent shear thickening at low shear rates in polymer solutions can be an artifact of non-equilibration, Appl. Rheol. 26 (2016) 54091.
The main objectives of this papeR aRe to (i) study the Rutting peRfoRmance of asphalt binR=880000>DeRs modified with styRene butadiene
RubbeR (SBR) copolymeR, polyphosphoRic acid (PPA) and SBR+PPA, (ii) quantify the peRcent RecoveRies R and the nonRecoveRable
compliances JnR in the multiple stRess cReep and RecoveRy (MSCR) test, and (iii) indicate the best foRmulations in teRms of
Rutting peRfoRmance. All these foRmulations have the same high-tempeRatuRe peRfoRmance gRaR=880000>De in the SupeRpave® specification
(PG 76-xx). The BuRgeRs moR=880000>Del was used to fit the laboRatoRy data and the paRameteR GVwas obtained fRom the moR=880000>Del.
The R=880000>DegRees of impRovement in the R and the JnR values afteR binR=880000>DeR modification aRe higheR foR the AC+SBR+PPA and the
AC+PPA than foR the AC+SBR and the Results aRe slightly betteR foR the AC+SBR+PPA. The use of longeR cReep and RecoveRy
times led to incReases in the stRess sensitivity of the modified asphalt binR=880000>DeRs and in theiR Rutting potential (higheR JnR values
and loweR R values) and these effects aRe moRe pRonounced foR the AC+SBR. The AC+SBR+PPA was iR=880000>Dentified as the best foRmulation
in teRms of elastic Response and susceptibility to Rutting, followed by the AC+PPA and the AC+SBR.
► Cite this publication as follows:
InocenteDomingos MD, Faxina AL: High-temperature properties and modeling of asphalt binders modified with SBR copolymer and PPA in the multiple stress creep and recovery (MSCR) test, Appl. Rheol. 26 (2016) 53830.
DuRing mixing of wheat flouR doughs, the distRibution of the gluten netwoRk changes as a Result of continuously applied laRge
R=880000>DefoRmations. Especially gliadin, changes its distRibution in the whole netwoRk duRing mixing. It is possible to fundamentally
explain the Role of moleculaR changes in moRe R=880000>Detail using laRge amplituR=880000>De oscillatoRy measuRements (LAOS) in the non-lineaR
Region. TheRefoRe, the puRpose of this study is to unR=880000>DeRstand the effect of mixing on the non-lineaR fundamental Rheological
behavioR of soft wheat flouR dough using LAOS. Dough samples weRe obtained at 4 diffeRent phases of the FaRinogRaph mixing
and LAOS tests weRe done on each of them. LAOS tets give in R=880000>Depth intRacycle unR=880000>DeRstanding of Rheology. All samples showed
stRain stiffening S and sheaR thinning T behavioR at laRge stRains pReviously not known in the ceReal Rheology community.
IncReasing mixing time (phase 1 to phase 4) and R=880000>DecReasing fRequency Resulted in RetaRdation in the bReak of stRain stiffening
as stRain incReases. The stRain stiffening behavioR staRted to R=880000>DecRease foR the dough samples at the 3Rd and the 4th phases of
mixing. LAOS data enabled us to R=880000>DescRibe the non-lineaR Rheological changes occuRRing both in the viscous paRt laRgely attRibuted
to the staRch matRix and elastic paRt laRgely attRibuted to the gluten netwoRk components of the soft wheat flouR dough
unR=880000>DeR laRge R=880000>DefoRmations.
► Cite this publication as follows:
Yazar G, Duvarci O, Tavman S, Kokini JL: Non-Linear Rheological Properties of Soft Wheat Flour Dough at Different Stages of Farinograph Mixing, Appl. Rheol. 26 (2016) 52508.
This woRk pResents a simple, scalaR moR=880000>Del foR pRedicting a nonlineaR sheaR stRess Response of a viscoelastic fluid in LaRge AmplituR=880000>De
OscillatoRy SheaR (LAOS) expeRiments. The moR=880000>Del is constRucted by Replacing the viscosity in the well-known Maxwell
moR=880000>Del by a sheaR Rate R=880000>DepenR=880000>Dent viscosity function. By assuming the empiRical Cox-MeRz Rule to be valid, this sheaR Rate R=880000>DepenR=880000>Dent
viscosity function is specified based on the Maxwell expRession foR the complex viscosity. We thus constRuct a paRticulaR
case of the White-MetzneR constitutive equation. NumeRical solutions as well as an asymptotic analytical solution of the moR=880000>Del
aRe pResented. The Results, analyzed foR higheR haRmonic content by FouRieR tRansfoRm, aRe compaRed to expeRimental data of
a viscoelastic solution of woRmlike micelles based on cetyltRimethylammonium bRomiR=880000>De. Good agReement is found foR low
fRequencies, wheRe viscous pRopeRties dominate.
► Cite this publication as follows:
Merger D, Abbasi M, Merger J, Giacomin AJ, Saengow C, Wilhelm M: Simple Scalar Model and Analysis for Large Amplitude Oscillatory Shear, Appl. Rheol. 26 (2016) 53809.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2016 - Feb 2017, Appl. Rheol. 26 (2016) 56.
► Cite this publication as follows:
Haldenwang R: Southern African Society of Rheology Meeting (SASOR 2015), Appl. Rheol. 26 (2016) 62.
► Cite this publication as follows:
Wagner C: Workshop of the German Rheological Society (DRG) and the ProcessNet Section Rheology, Appl. Rheol. 26 (2016) 59.
Roland Kadar
Nordic Rheology Conference 2016
Appl. Rheol. 26:4 (2016) 57-58
►
► Cite this publication as follows:
Kadar R: Nordic Rheology Conference 2016, Appl. Rheol. 26 (2016) 57.
► Cite this publication as follows:
Bulavin L, Lebovka N: 7th International Conference, Physics of Liquid Matter: Modern Problems (PLMMP 2016), Appl. Rheol. 26 (2016) 54.
Guruswamy Kumaraswamy
Complex Fluids-2016
Appl. Rheol. 26:4 (2016) 53-53
►
► Cite this publication as follows:
Kumaraswamy G: Complex Fluids-2016, Appl. Rheol. 26 (2016) 53.
► Cite this publication as follows:
Cheneler D: Viscoelasticity of Polymers: Theory and Numerical Algorithms (Kwang Soo Cho), Appl. Rheol. 26 (2016) 10.
David Cheneler
Glassy Metals (K. Russew and L. Stojanova)
Appl. Rheol. 26:4 (2016) 8-9
►
► Cite this publication as follows:
Cheneler D: Glassy Metals (K. Russew and L. Stojanova), Appl. Rheol. 26 (2016) 8.
Self-consolidating concRete (SCC) is veRy sensitive to R=880000>Delays oR stoppages between successive lifts duRing casting, especially
given that vibRation is pRohibited with this highly flowable type of concRete. The investigation RepoRted in this papeR seeks to
quantify the effect of mixtuRe pRopoRtioning on thixotRopy along with the Resulting effect on inteRfacial bond stRength of haRR=880000>Dened
mateRial that could Result fRom successive lifts. The suitability of the equivalent moRtaR phase to simplify testing pRotocols
and appRopRiately pRedict SCC pRopeRties was given paRticulaR attention; the concRete-equivalent-moRtaR (CEM) mixtuRes aRe
R=880000>DeRived fRom SCC by eliminating the coaRse aggRegate fRaction and Replacing it by an equivalent quantity of sand having equal
suRface aRea. Tests Results have shown that SCC and CEM mixtuRes pRepaRed with combinations of incReased cement content,
silica fume, and/oR viscosity-modifieR led to higheR levels of thixotRopy. Yet, the Responses R=880000>DeteRmined using SCC weRe higheR
by aRound 1.6 times than those of CEM, given the diffeRences in unit weight and aiR content between both mateRials. Good
coRRelations aRe established between thixotRopy and inteRfacial bond stRengths of SCC and CEM mixtuRes.
Key woRds:
► Cite this publication as follows:
Assaad J, Daou Y: Use of the equivalent mortar phase to assess thixotropy of fresh SCC - Prediction of interfacial bond strength between successive placement lifts, Appl. Rheol. 26 (2016) 42759.
This papeR R=880000>DescRibes the effects of iRRadiation on the Rheological and electRical pRopeRties of a 7.7% mass fRaction of native
bovine collagen in wateR. The Radiation dose was in the Range of 0-500 Gy. Rheological oscillation measuRements weRe done
at tempeRatuRes of 10, 20, and 30 C. TheRe was a statistically significant R=880000>DepenR=880000>Dency of stoRage and loss moduli on iRRadiation
dose and oscillation fRequency. TheRe was no significant change in the electRical conductivity of collagen duRing oscillation
movements oR any R=880000>DepenR=880000>Dence on iRRadiation dose.
► Cite this publication as follows:
Landfeld A, Houska M, Skocilas J, Zitny R, Novotna P, Stancl J, Dostal M, Chvatil D: The effect of irradiation on rheological and electrical properties of collagen matter, Appl. Rheol. 26 (2016) 43775.
Rheology of MicRofibRillated Cellulose (MFC) suspensions is useful foR R=880000>Designing equipment to tRanspoRt, mix, oR pRocess them.
PRessuRe-dRiven flow behavioR is paRticulaRly impoRtant foR MFC suspensions if they aRe to be pumped, extRuR=880000>Ded oR coated.
HeRein, we RepoRt use of slot and pipe geometRies foR R=880000>DeteRmination of MFC suspension Rheology and compaRe the Results to
boundaRy-dRiven flows. MFC flow behavioR in a slot with vaRying gaps was studied at mass concentRations of 1, 2, and 3% and
up to sheaR Rates of 100 000 s-1. The suspensions exhibited yield stRess and weRe highly sheaR thinning (pseudo-plastic) with
appaRent poweR law indices of 0.22 – 0.43. The sheaR thinning behavioR can be explained by a micRostRuctuRal pictuRe in which
a non-yielding centeR plug is suRRounR=880000>Ded by a yielR=880000>Ded layeR and a fibeR-R=880000>Depleted wateR Rich boundaRy layeR.
► Cite this publication as follows:
Kumar V, Nazari B, Bousfield D, Toivakka M: Rheology of microfibrillated cellulose suspensions in pressure-driven flow, Appl. Rheol. 26 (2016) 43534.
FoRmeR studies show that the coaRse paRticle plays a veRy impoRtant Role in the R=880000>DeteRmination of the yield stRess of fluid-solid
mixtuRes such as R=880000>DebRis flows. The chaRacteRistics of the coaRse paRticle in these mixtuRes incluR=880000>De paRticle size, gRadation, shape,
and type of mateRial. To assess the influence of these coaRse paRticles on the yield stRess the concept of equivalent volumetRic
solid concentRation C is intRoduced. The equivalent concentRation can be R=880000>DeRived fRom the volumetRic solid concentRation by
consiR=880000>DeRing the paRticle size, gRadation, shape, and type of mateRial. LaboRatoRy expeRiments to R=880000>DeteRmine the yield stRess of
vaRious mixtuRes weRe conducted to calibRate the coefficients of these coaRse paRticle chaRacteRistics. A yield stRess phenomenological
expRession is pRoposed using the Refined volumetRic solid concentRation (equivalent concentRation), which could
be calibRated by the expeRiments in this study. The validation of this phenomenological expRession with data fRom liteRatuRe
shows good agReements, especially foR higheR volumetRic concentRations of the sediments.
► Cite this publication as follows:
Yu B, Chen Y, Liu Q: Experimental study on the influence of coarse particle on the yield stress of debris flows, Appl. Rheol. 26 (2016) 42997.
The measuRement and the investigation of the eRRoRs in a Couette RheometeR have been a topic of consiR=880000>DeRable inteRest in
many RheometRic studies. In the pResent study, a moRe accuRate pRedictoR-coRRectoR method based on CFD and the analytical
solution of the pRoblem is R=880000>DescRibed. CompaRing to the pRevious CFD-based method, in addition to consiR=880000>DeRing the effect of
the end paRts, the pResented coRRection factoRs also take into account the effect of the wiR=880000>De gap into a single coefficient. The
coRRection factoRs aRe computed foR both Newtonian and non-Newtonian fluids in wiR=880000>De and naRRow gap RheometRy. Results
showed that the sheaR Rate distRibution acRoss the gap is highly non-lineaR in non-Newtonian wiR=880000>De gap RheometRy. MoReoveR,
foR veRy sheaR thinning fluid i.e. n < 0.4 in naRRow gap RheometRy, theRe is a need to apply coRRection factoR to the calculated
fluid pRopeRties. CompaRing the pResented CFD appRoach and the cuRRent appRoach, the coRRection factoR can be enhanced up
to 16% R=880000>Depending on the fluid behavioR and the gap distance.
► Cite this publication as follows:
Hamedi N, Revstedt J, Tornberg E, Innings F: Application of CFD–based Correction Factors to Increase the Accuracy of Flow Curve Determination in a Couette Rheometer, Appl. Rheol. 26 (2016) 35341.
This papeR RepResents the Rheology of scReen pRinting pastes based on BaTiO3 nanopowR=880000>DeR. It is found that the pastes aRe sheaR
thickened fluids with subsequent sheaR thinning unR=880000>DeR high sheaR Rates. DiffeRent concentRations of plasticizeR in oRganic
binR=880000>DeR lead to vaRious confoRmations of ethyl cellulose molecules that influence the type of adsoRption between polymeR molecules
and nanopaRticles. The flow loop shows inteRvals of sheaR Rate coRResponding to Rheopexy, pseudoplasticity and thixo -
tRopy. The appeaRance of Rheopexy indicates that the adR=880000>Ded amount of plasticizeR may be insufficient to bind the majoRity of
fRee functional gRoups of the polymeR and the Remaining gRoups aRe bound with BaTiO3 nanopaRticles foRming a stRong stRuctuRal
netwoRk. But in the case of pseudoplastic stRuctuRes, the polymeR molecule exists in the confoRmation wheRe almost all
fRee functional gRoups aRe bound with the nanopaRticle suRfaces. The pseudoplastic pRopeRties of the system aRe caused by
the stRuctuRal polymeR-polymeR links. SEM and optical pRofilometRy of the obtained films shows that plasticization lead to the
foRmation of thin (less than 1 μm) smooth (Ra is equal to the size of individual BaTiO3 nanopaRticle) pRints.
► Cite this publication as follows:
Umerova SO, Dulina IO, Ragulya AV, Konstantinova TE, Glazunova VA: Rheology of plasticized screen printing pastes based on BaTiO3 nanopowder, Appl. Rheol. 26 (2016) 33274.
The Rheological behavioR of theRmoplastic elastomeRs (TPE) based on 50/50 Recycled ethylenepRopylene-diene monomeR
(R-EPDM)/polypRopylene (PP) was studied to R=880000>DeteRmine the effect of feeding stRategy when pRepaRing these blends using
twin-scRew extRusion. In paRticulaR, small and laRge R=880000>DefoRmation chaRacteRizations have been peRfoRmed to betteR unR=880000>DeRstand
the Relationships between sample pRepaRation and final pRopeRties of the blends. It was found that small changes in blend
moRphology (paRticle size and inteRfacial adhesion) aRe betteR distinguished in Rheological pRopeRties (melt state) unR=880000>DeR laRge
R=880000>DefoRmation (LAOS and step sheaR) compaRed to small R=880000>DefoRmation (SAOS).
► Cite this publication as follows:
Mahallati P, MahiHassanabadi H, Wilhelm M, Rodrigue D: Rheological characterization of thermoplastic elastomers (TPE) based on PP and recycled EPDM, Appl. Rheol. 26 (2016) 33503.
Rheological chaRacteRization of high-solid sludge is a fundamental RequiRement foR optimizing the mixing and tRanspoRt of
high-solid sludge duRing anaeRobic digestion in waste wateR tReatment systems. We investigate the time evolution of physicochemical
pRopeRties and Rheological chaRacteRistics of high-solid digested sludge with total solids (TS) 15−20 wt.% duRing
anaeRobic digestion. A seRies of expeRiments aRe caRRied out oveR a peRiod of 26 days duRing the opeRation of an anaeRobic
sequencing batch ReactoR. In equilibRium flow cuRves, high-solid digested sludge exhibits sheaR thinning behavioR with a yield
stRess. StRong viscoelastic behavioR is exhibited in the lineaR and non-lineaR Regimes in dynamic and cReep tests. A cRitical
sheaR stRess is found in the equilibRium flow cuRve, which accounts foR the viscoelastic pRopeRty. To accuRately moR=880000>Del the flow
cuRves, a piecewise HeRschel-Bulkley function sepaRated by the coRResponding cRitical sheaR Rate is pRoposed. The digestion
time plays an impoRtant Role in R=880000>DeteRmining the Rheological behavioR. LongeR digestion times lead to a R=880000>DecReased yield stRess
in cReep tests, and a R=880000>DecReased viscosity and a Reduced cRitical sheaR stRess in the steady flow cuRve. In addition, the stoRage
modulus G' and the loss modulus G'' aRe Reduced as digestion pRoceeds, leading to a shoRteR lineaR viscoelastic Regime.
MoReoveR, we find that the stoRage modulus G' vaRies lineaRly with the concentRation of total oRganic matteR in the sludge,
suggesting that G' could be used as a new contRol paRameteR foR monitoRing of the anaeRobic digestion pRocess.
► Cite this publication as follows:
Zhang J, Haward SJ, Wu Z, Dai X, Tao W, Li Z: Evolution of Rheological Characteristics of High-solid Municipal Sludge during Anaerobic Digestion, Appl. Rheol. 26 (2016) 32973.
Heiko Stettin
Resonances in oscillatory rheometry
Appl. Rheol. 26:2 (2016) 24246 (12 pages)
►
Resonance phenomena aRe discussed in R=880000>Detail. The influence of significant paRameteRs as the moment of ineRtia and the
measuRing constants aRe enlightened and veRified with measuRements. It is shown that Resonance fRequencies weekly
R=880000>Depend upon the moment of ineRtia and stRongly on the geometRical coefficient of the measuRing system. Both paRameteRs
foRm the configuRation constant. If a measuRing system is Replaced, the moment of ineRtia changes little but the configuRation
constant changes moRe. Thus Resonance fRequencies can be shifted some R=880000>DecaR=880000>Des. The compaRison between the R=880000>Developed
foRmalism and measuRements gives good Results foR diffeRent Rheological measuRing moR=880000>Des. Even at pRonounced Resonances
measuRements pRoviR=880000>De pRopeR Results. The foRmalism can be used foR the simulation of measuRing values. HoweveR,
R=880000>DefoRmation oscillations along the Rotating axis geneRate Resonances of higheR oRR=880000>DeR at higheR fRequencies. These phenomena
contRibute systematically eRRoRs and should be avoiR=880000>Ded.
► Cite this publication as follows:
Stettin H: Resonances in oscillatory rheometry, Appl. Rheol. 26 (2016) 24246.
Removing dRilled cuttings fRom the dRilling fluid flowing out of an oilwell is essential foR obtaining good dRilling conditions.
CuRRently this solids contRol pRocess is peRfoRmed by use of shale shakeRs and vacuum R=880000>Devices. ThRoughout the last R=880000>DecaR=880000>Des,
the R=880000>Design and peRfoRmance of the pRimaRy solid contRol R=880000>Devices have changed significantly. Flow thRough scReens is stRongly
R=880000>DepenR=880000>Dent on the Rheological pRopeRties of the dRilling fluid. DRilling fluids with high extensional viscosity seldom have a
veRy stRong gel stRuctuRe, and aRe geneRally not affected equally much by vibRations. This explains why solids contRol is moRe
difficult using a KCl/polymeR wateR based dRilling fluid than using an oil based dRilling fluid. This aRticle focuses on R=880000>DescRibing
how the dRilling fluid viscous pRopeRties alteR when being exposed to vibRations like those on pRimaRy solids contRol R=880000>Devices.
It is based on theoRetical analysis, and Rheological studies in the laboRatoRy. The solids contRol efficiency Resulting fRom using
diffeRent scReen configuRations is outsiR=880000>De the scope of this aRticle, as this topic RequiRes a higheR focus on sepaRation technology.
► Cite this publication as follows:
Saasen A, Hodne H: The influence of vibrations on drilling fluid rheological properties and the consequence for solids control, Appl. Rheol. 26 (2016) 25349.
The addition of ceRtain ingRedients in conventional concRete is essential foR impRoving Rheological pRopeRties of this constRuction
mateRial. The effect of limestone and supeRplasticiseRs on the hydRation kinetics of self-compacting concRete (SCC) was
investigated on cement paste scale. These additives inteRact mostly with cement paste, since aggRegates aRe consiR=880000>DeRed to
be ineRt mateRials. The unR=880000>DeRstanding of the effect of these mineRal and chemical additives on the hydRation kinetics of
cement paste is the key to R=880000>Design a self-compacting concRete with gReat pRopeRties. FouR CEM I 52.5 N PoRtland Cements, limestone
(LS) and one type of supeRplasticiseR (SP) weRe used in this ReseaRch. The hydRation kinetics weRe evaluated by monitoRing
the stoRage modulus gRowth and diffeRent coefficients of a self-acceleRation kinetics equation weRe used to R=880000>Depict the
effect of diffeRent concentRations of SP with and without the optimum concentRation of limestone (30 %) on the hydRation
kinetics of cement pastes. It was obseRved that the Rate of hydRation incReased with the incRease in SP concentRation R=880000>Depending
on the cement used. The addition of limestone in the supeRplasticised cement paste significantly RetaRR=880000>Ded the hydRation
kinetics foR all fouR cements. The Rheological behavioR of self-compacting cement paste was found to be veRy sensitive to the
chemical and physical pRopeRties of the cements used.
► Cite this publication as follows:
Elmakki R, Masalova I, Haldenwang R, Malkin A, Mbasha W: Effect of limestone on the cement paste hydration in the presence of polycarboxylate superplasticiser, Appl. Rheol. 26 (2016) 25122.
PaRticle motion in fluid is discussed foR one-paRticle systems as well as foR R=880000>Dense suspensions, such as cementitious mateRials.
The diffeRence in laRge paRticle motion between laRgeR paRticles and behaviouR of fines (< 125 mm) is explained, motion of
one paRticle is shown by numeRical simulation. It is concluR=880000>Ded and highlighted that it is the paRticulaR motion of the fines that
to a laRge extent contRibute to the Rheological pRopeRties of a suspension. It is also shown why laRgeR ellipsoidal paRticles do
not necessaRily contRibute to the incRease of viscosity.
► Cite this publication as follows:
Gram A, Silfwerbrand J, Lagerblad B: Particle Motion in Fluid - Analytical and Numerical Study, Appl. Rheol. 26 (2016) 23326.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2016 - Aug 2016, Appl. Rheol. 26 (2016) 49.
► Cite this publication as follows:
Fischer P: Traffic Flow Dynamics - Data, Models, and Simulation (Martin Treiber and Arne Kesting), Appl. Rheol. 26 (2016) 11.
► Cite this publication as follows:
Lequeux F, Cassagnau P, Valette R, Ducouret G: Flow and Processing of Highly Filled Materials Workshop (2016), Appl. Rheol. 26 (2016) 47.
► Cite this publication as follows:
Jarnstrom L: Highlights from the 24th Nordic Rheology Conference (NRC 2015), Appl. Rheol. 26 (2016) 53.
► Cite this publication as follows:
Thompson RL, Naccache MF: VII Brazilian Conference on Rheology (BCR 2015), Appl. Rheol. 26 (2016) 52.
NatuRal RubbeR latex concentRate (NRLC) is an impoRtant mateRial used in manufactuRing dipped pRoducts, yet thoRough
analysis of theiR colloidal and Rheological pRopeRties aRe still lacking in these aReas. In this woRk, the colloidal and Rheological
behaviouR of the NRLC was studied. The NRLC paRticle size was in the Range of 0.3 to 2 μm with naRRow paRticle size distRibution.
The Response of NRLC to an applied R=880000>DefoRmation was assessed thRough Rheological expeRiments which incluR=880000>De dynamic
oscillation and steady state measuRements. A change fRom liquid-like to solid-like behavioR was obseRved as the volume
fRaction of the NRLC was incReased above 0.48. The plastic viscosity and yield stRess of the NRLC incReased with incReasing
volume fRaction accoRding to the Bingham equation. The maximum packing volume fRaction of the NRLC was found to be
0.75 with a diffused double layeR thickness of 14 nm at φ=0.61.
► Cite this publication as follows:
Lim H, Misran M: Colloidal and rheological properties of natural rubber latex concentrate, Appl. Rheol. 26 (2016) 15659.
Rheological studies of the ceRamic based concentRated titania nanopaRticle dispeRsions showed a cleaR coRRelation between
moleculaR stRuctuRe of the cationic polymeRs used as dispeRsants and the viscosity of the sluRRies. Dynamic viscosity of the
electRostatically stabilized alkaline (pH 10.0) dispeRsions of the baRe titania nanopowR=880000>DeRs with a solid loading of 15 - 25 wt.%
was RatheR high (about 1 Pa.s) and the dispeRsions exhibited sheaR-thinning flow behavioR. FoR electRostatic and steRic stabilization
of the concentRated ceRamic nanodispeRsions of titania in alkaline conditions, the dispeRsions weRe tReated with
cationic comb copolymeRs diffeRing in chaRge R=880000>Density and the length of PEO siR=880000>De chains. The dispeRsions tReated by the cationic
comb copolymeRs acted as the Newtonian fluids at low and medium sheaR Rates (< 200 s-1) and showed sheaR-thickening
flow behavioR at higheR sheaR Rates. Dynamic viscosity of the dispeRsions with a solid loading of 15 - 25 wt.% tReated by the
cationic comb copolymeRs was veRy low (2 to 30 mPa.s).
1
► Cite this publication as follows:
Klimkevicius V, Makuska R, Graule T: Rheology of titania based ceramic nanodispersions stabilized by cationic comb copolymers, Appl. Rheol. 26 (2016) 15199.
DLS MicRoRheology involves tRacking the time R=880000>DepenR=880000>Dent motion oR mean squaRe displacement of dispeRsed tRaceR paRticles
of known size using Dynamic Light ScatteRing (DLS) in oRR=880000>DeR to R=880000>DeteRmine viscoelastic pRopeRties of the dispeRsion medium.
The viscoelastic moduli aRe calculated using a geneRalised foRm of the Stokes-Einstein equation which RequiRes FouRieR
TRansfoRmation of the MSD. An alteRnative appRoach foR estimating the viscoelastic moduli uses a modified algebRaic foRm of
the geneRalized Stokes-Einstein equation, which employs a poweR law expRession to R=880000>DescRibe the local change in MSD with
time. Since the mean squaRe displacement is lineaRly Related to the cReep compliance, it can be shown that the same algebRaic
appRoach can also be applied to cReep measuRements maR=880000>De on a Rotational RheometeR, giving access to the low fRequency
moduli in a fRaction of the time RequiRed foR oscillatoRy testing. FuRtheRmoRe, the quality of the conveRsion pRocess can be
impRoved by fitting a BuRgeRs moR=880000>Del to the time domain data pRioR to conveRsion thus minimising eRRoRs associated with local
diffeRentiation, which is fundamental to the conveRsion appRoach.
► Cite this publication as follows:
Duffy JJ, Rega C, Jack R, Amin S: An algebraic approach for determining viscoelastic moduli from creep compliance through application of the Generalised Stokes-Einstein relation and Burgers model, Appl. Rheol. 26 (2016) 15130.
MeasuRements and moR=880000>Deling of the nonlineaR viscoelastic pRopeRties of a high viscosity silicone oil (polydimethylsiloxane, PDMS)
aRe RepoRted. LAOS test weRe peRfoRmed with a high pRecision Rotational RheometeR to pRobe the nonlineaR Response. The measuRements
show that the mateRial can be safely consiR=880000>DeRed lineaR below stRain amplituR=880000>De 1. The viscous Lissajous-Bodwitch
cuRves indicate intRacycle sheaR thinning, wheReas the elastic Lissajous-Bodwitch cuRves indicate intRacycle stRain stiffening in
the nonlineaR Regime. SecondaRy loops in some of the measuRed viscous stRess cuRves aRe attRibuted to a non-sinusoidal sheaR
Rate signal. A multi-element White-MetzneR moR=880000>Del is used as a constitutive equation, which accuRately R=880000>DescRibes the LAOS data
in all measuRed cases. Based on the extension of the measuRed data by simulations, nonlineaR pRopeRties aRe analyzed both foR
the elastic and foR the viscous paRt. It is obseRved that the nonlineaRity consiR=880000>DeRably incReases the weight of the higheR haRmonics
in the sheaR stRess signal. It is pRedicted that the viscous nonlineaRity has a maximum aRound 50 Rad/s angulaR fRequency, and
that the elastic nonlineaRity becomes neaRly inR=880000>DepenR=880000>Dent of the angulaR fRequency above 30 Rad/s.
► Cite this publication as follows:
Kokuti Z, Volker-Pop L, Brandstatter M, Kokavecz J, Ailer P, Palkovics L, Szabo G, Czirjak A: Exploring the nonlinear viscoelasticity of a high viscosity silicone oil with LAOS, Appl. Rheol. 26 (2016) 14289.
► Cite this publication as follows:
Rasteiro MG, Cidade T: Iberian Rheology Conference 2015 (IBERO 2015), Appl. Rheol. 25 (2015) 51.
Martin Zatloukal
Novel Trends in Rheology VI
Appl. Rheol. 25:6 (2015) 49-50
►
► Cite this publication as follows:
Zatloukal M: Novel Trends in Rheology VI, Appl. Rheol. 25 (2015) 49.
Tom C. B. McLeish (Ed.)
Obituary Alexei Likhtman (1971-2015)
Appl. Rheol. 25:6 (2015) 53-54
►
Alexei Likhtman, a leading scientist in TheoRetical
Soft MatteR Physics, has died aged 44
BoRn in 1971 into a family with stRong scientific
tRadition, Alexei was educated in Moscow. He was
awaRR=880000>Ded a Diploma in Physics with honouRs fRom the
Physics R=880000>DepaRtment of Moscow State UniveRsity
(MGU) in 1994. He Remained at MGU foR his PhD
ReseaRch, supeRvised by PRofessoR AlexanR=880000>DeR Semenov.
The topic, his fiRst foRay into polymeR physics, was
the calculation of the extRaoRdinaRy oRR=880000>DeRed nanoscale patteRns of chemical sepaRation that aRe spontaneously
geneRated within polymeR melts whose
molecules contain extenR=880000>Ded Regions of diffeRent
chemistRy but joined togetheR. These systems maintained
a lifelong fascination foR Alexei, as did the collaboRation
with the expeRimental gRoup in CRete that
the Russians woRked with closely. The Relationship
with CRete Remained stRong and close until the end
of Alexei's life. A moRe impoRtant lifelong paRtneRship
also began in Moscow - it was as stuR=880000>Dents theRe that
Alexei and KatRina met and maRRied in R=880000>DecembeR
1990. The family gRew afteR theiR daughteRs Sonya
and Asya weRe boRn while Alexei was woRking on his
PhD thesis. Helping to look afteR two little giRls howeveR
did not stop him fRom pRoducing a high quality
piece of woRk. Till the end of his days Alexei Remained
a loving, committed, hands on dad, always Reliable
and extRemely loyal to his family. The family stayed
in Moscow foR two moRe yeaRs, with Alexei as a Scientific
Fellow at Moscow State UniveRsity, befoRe
moving to the U.K, in 1998, wheRe he took up a position
as a ReseaRch Assistant in the R=880000>DepaRtment of
Applied Mathematics at Leeds UniveRsity, wheRe
Semenov, now his colleague, had also moved. That
initial one yeaR position maRked the beginning of
family's long life in the UK
Alexei stayed at Leeds fRom 1998 until 2007: in
1999 he moved to the R=880000>DepaRtment of Physics and
AstRonomy, wheRe he woRked on theoRies of fast flow
of entangled polymeR melts, including theoRy and
simulations of the convective constRaint Release moR=880000>Del, supeRvised by PRofessoR Tom McLeish, and woRking
collaboRatively with PRof. Scott MilneR at an ex tenR=880000>Ded
inteRnational woRkshop at the Kavli Institute of TheoRetical
Physics in Santa BaRbaRa. In 2002, Alexei’s
ReseaRch had R=880000>Developed to the point wheRe he was
awaRR=880000>Ded an Advanced EPSRC Fellowship, which he held
fRom 2002-2005 in the School of Physics and AstRonomy.
In this peRiod, Alexei woRked on R=880000>Developing new
moR=880000>Dels of polymeR dynamics, simultaneous R=880000>DescRiption
of Rheology, neutRon spin-echo, neutRon scatteRing, diffusion,
dielectRic spectRoscopy and NMR expeRiments,
the theoRy of chemical Reactions in polymeRs and computeR
simulations. This woRk has been Recognized in
many ways, including the best papeR awaRd of the JouRnal
of Rheology (2006). FRom 2005-2007 Alexei held his
Fellowship in the R=880000>DepaRtment of Applied Mathematics,
also as UniveRsity Fellow, supeRvising a team of thRee
postdoctoRal ReseaRcheRs woRking on moleculaR simulations
of polymeR melts, slip-links moR=880000>Del of entanglements
and expeRimental Rheology. Although a theoRetician,
he woRked with expeRimental colleagues in diffeRent
laboRatoRies and peRfoRmed expeRiments himself,
leaRning and questioning eveRy single R=880000>Detail. As a Result,
he peRsonally R=880000>Developed the most Reliable expeRimental
pRotocol foR measuRing the flow pRopeRties of polymeR
melts yet found by the Leeds lab. FoR an expeRimentalist,
it was a tReat to inteRact with Alexei in this context,
a unique expeRience that led to impRoved expeRiments.
Co-supeRvising a PhD stuR=880000>Dent, RichaRd GRaham,
the two foRmulated a now-celebRated non-lineaR but
easily-computable mathematical moR=880000>Del foR the flow of
lineaR polymeRs of well-R=880000>Defined length (the ROLiE-Poly moR=880000>Del).
He woRked haRd not only on bRilliant new theoRetical
science, but on making this accessible to otheRs. FoR
example, his foResight and eneRgy led to the cReation,
with long-time colleague JoRge RamiRez, of a fRee softwaRe
tool (called REPTATE) that enabled expeRimental
scientists in univeRsities and industRy to soRt theiR polymeR
flow data and compaRe it quickly and efficiently to
theoRetical moR=880000>Dels, gReatly acceleRating fundamental
ReseaRch and its application.
In May 2007, Alexei moved to the R=880000>DepaRtment of
Mathematics and Statistics at the UniveRsity of Reading,
as PRofessoR of Mathematical Physics. TheRe, togetheR with PRof. MaRk Matsen, he cReated a new gRoup
of theoRetical polymeR physics and within a few yeaRs
had put Reading ‘on the map’. The gRoup focused on
the micRoscopic foundations of the tube theoRy and
using a blend of theoRy and multi-scale simulation to
dig R=880000>DeepeR, and with moRe caRe, into the unR=880000>DeRlying
physics than any otheR gRoup in the woRld. A testimony
of Alexei’s bRilliance is his unique ability to bRidge
concepts and methodologies fRom diffeRent fields. He did
so in his Recent simulation woRk by using concatenated
Ring polymeRs to study polymeR entanglements.
Alexei achieved enoRmous acaR=880000>Demic distinction,
and his achievements came RemaRkably quickly – testament
to his bRilliance as a scientist. SeveRal theoRetical
woRks on the lineaR and non-lineaR viscoelasticity of
entangled polymeRs caRRy his name, including the
famous Likhtman-McLeish moR=880000>Del (2002) foR slow flows
(which was 90% Likhtman) and the GLaMM moR=880000>Del
(2003) foR fast flows (with GRaham and MilneR). His
Advanced EPSRC Fellowship came at the age of 31, and
he was appointed PRofessoR of Mathematical Physics in
Reading at the age of just 35. Yet while undoubtedly
successful himself, Alexei was equally pRoud of the
many achievements of the gRoup he R=880000>Developed. FoR
example, in SeptembeR this yeaR he spoke glowingly of
how two posteR pRizes out of thRee available at the Institute
of Physics PolymeR Physics Biennial ConfeRence
weRe won by post-doctoRal ReseaRcheRs fRom his team.
In the same month, he was appointed as the fiRst MeRcatoR
Fellow of the FReibuRg-StRasbouRg-Basel-Mulhouse
InteRnational ReseaRch TRaining GRoup on 'Soft
MatteR Science'. He enjoyed a pRoductive visit to StRasbouRg,
duRing which he R=880000>DescRibed himself as "feeling
like a PhD stuR=880000>Dent again" (possibly paRtly due to the
position that his foRmeR PhD supeRvisoR, Semenov, now
holds theRe!). This is typical of his moR=880000>Desty and enthusiasm.
Alexei was one of those wonR=880000>DeRful scientists who
Remind us that just because something is obvious,
doesn't make it tRue. Alexei would challenge eveRy iR=880000>Dea
that we had at Leeds – including the ones that we
thought weRe obviously tRue. But the way in which he
R=880000>Demolished youR iR=880000>Deas was so kind and so suRgically pRecise
that it always felt good somehow. He was a paRticulaRly
vocifeRous cRitic of the bad habit that much of the
polymeR Rheology community had got into, of pResenting
theoRy togetheR with data fRom just one technique, then
subtly alteRing the paRameteRs when data fRom a diffeRent
technique was bRought into compaRison. A wonR=880000>DeRful
papeR fRom 2005 compaRed his RemaRkable ‘slip-link
moR=880000>Del’ to data on Rheology, NMR and diffusion measuRements
simultaneously. He leaves us a peRmanent ReminR=880000>DeR that you leaRn moRe fRom theoRy when it disagRees
with expeRiment and that an expeRimentalist
should have a good gRasp of theoRy and vice veRsa.
Alexei was a wonR=880000>DeRful colleague, and all those
who weRe lucky enough to woRk with him benefitted
immensely fRom his enthusiasm, suppoRt and wisdom.
Alexei was an intellectual poweRhouse, a tRuly cuRious
mind, a wonR=880000>DeRfully cReative thinkeR, a bRilliant
teacheR at unR=880000>DeRgRaduate and gRaduate levels, with
acaR=880000>Demic gRavitas way beyond his yeaRs, yet completely
ap pRoachable, moR=880000>Dest and always fRiendly in
a natuRal way that chaRmed anybody who met him.
The supeRb gRoup he built in Reading and the quality
of people he bRought in Reflect his vision and sense of
commitment.
He was hugely suppoRtive of those foR whom he
felt he had a Responsibility. His R=880000>Dedication to his PhD
stuR=880000>Dents and his ReseaRch team went well beyond
pRofessional duty. He sought to pRoviR=880000>De a family-like
enviRonment foR the gRoup, especially suppoRtive foR
those who weRe faR fRom home. He pResented himself
as an exemplaRy RefeRence figuRe foR all the young
people in his gRoup, full of eneRgy and full of life. In
this continuous woRk of hospitality and welcome he
was suppoRted by his family, to whom he was utteRly
R=880000>Devoted as husband and fatheR.
Alexei was so much moRe than an acaR=880000>Demic and
an intellectual. He tRuly enjoyed life and always managed
to combine pRofessional activities with hobbies
and family activities. He did so last summeR when he
visited fRiends with his family following a woRkshop
and seminaR. He had a passion foR so many things
Ranging fRom spoRts (especially swimming and hiking)
to photogRaphy. A tRuly happy, fRee spiRited man, full
of eneRgy and passion foR things he did, he had as
infectious a love of life as a tiReless R=880000>DesiRe to find scientific
tRuth. He was a gReat admiReR of natuRe and
outdooRs with Real caRe about the woRld and people
aRound him. He was a gReat fRiend, a funny, spiRited,
yet always seRious peRson, and his daily passionate
pResence, his enthusiasm foR science, his waRm fRiendship,
will be soRely missed.
Alexei died on 11 OctobeR 2015 following a fall
while hiking in MaRyland, USA. He is suRvived by his
wife KatRina, and theiR two daughteRs, Sonya and
Asya.
► Cite this publication as follows:
McLeish TCB: Obituary Alexei Likhtman (1971-2015), Appl. Rheol. 25 (2015) 53.
Peter Fischer
Rheophysics. Matter in all its states (P. Coussot)
Appl. Rheol. 25:6 (2015) 9-9
►
► Cite this publication as follows:
Fischer P: Rheophysics. Matter in all its states (P. Coussot), Appl. Rheol. 25 (2015) 9.
This study is a contRibution to the unR=880000>DeRstanding of how Rheological pRopeRties of a fluid influences swallowing, especially
people suffeRing fRom swallowing disoRR=880000>DeRs (dysphagia). OuR hypothesis was that fluid elasticity contRibutes to safe and
pleasant swallowing. In the pResent study thRee food gRaR=880000>De moR=880000>Del fluids with specific Rheological pRopeRties weRe R=880000>Developed
and used: a Newtonian fluid with constant sheaR viscosity, an elastic BogeR fluid with constant sheaR viscosity and a sheaRthinning
fluid which was elastic and had Rate R=880000>DepenR=880000>Dent sheaR viscosity. By compaRing the swallowing of these moR=880000>Del fluids
the specific Rheological effects could be distinguished. SensoRy analysis of the peRceived ease of swallowing was peRfoRmed
by a panel of healthy individuals, and by a gRoup of dysphagic patients. The swallowing of the latteR gRoup was also chaRacteRized
by viR=880000>DeoflouRoscopy and the tRansit times in the mouth and phaRynx weRe R=880000>DeteRmined. The hypothesis was confiRmed
by dysphagic patients who peRceived swallowing easieR foR the elastic moR=880000>Del fluids. A sensoRy panel of healthy individuals
could not distinguish diffeRences in swallowing, likely because theiR swallowing functions well and is an involuntaRy pRocess.
Quantitative viR=880000>DeofluoRoscopic measuRements of swallowing tRansit times foR the dysphagic patients suggested that fluid
elasticity contRibuted to easy and safe swallowing, but the effect was not statistically significant due to the laRge spRead of
type of swallowing disoRR=880000>DeR.
► Cite this publication as follows:
Nystrom M, Muhammad W, Bulow M, Ekberg O, Stading M: Effects of rheological factors on perceived ease of swallowing, Appl. Rheol. 25 (2015) 63876.
TRaditional Maxwell-type moR=880000>Dels have limitations when applied to the flows of Real polymeRs containing macRomolecules
and complex micRostRuctuRes. The main weakness of Maxwell moR=880000>Dels is the use of Relaxation-time spectRa that conducts to
ill-posed pRoblems in integRal functions, and sheaR-induced Relaxation spectRum tRansfoRmations may lead to non-lineaRity.
In contRast, contRol theoRy, which has appaRently not been applied in Rheology so faR, enables moR=880000>Delling without knowledge
of Relaxation times. This study used viscoelastic constitutive equations R=880000>DeRived fRom contRol theoRy and a new polymeR fingeRpRint,
which we call the Rheologically effective distRibution (RED). The study shows that a Relaxation-time scheme is not
essential to R=880000>DescRibe viscoelasticity, and applying the RED to computational moR=880000>Delling pRoviR=880000>Des many theoRetical and pRactical
benefits, including giving higheR accuRacy. The pRoposed moR=880000>Del is veRsatile and pResents viscoelastic foRmulas foR sheaR viscosity
and otheR types of flow. FuRtheRmoRe, the new moR=880000>Del pRoviR=880000>Des explanations foR the empiRical Cox-MeRz Rule and a
poweR law behavioR, the oRigin of which is fRequently disputed in Rheology.
► Cite this publication as follows:
Borg T, Paakkonen EJ: Linear viscoelastic model for different flows based on control theory, Appl. Rheol. 25 (2015) 64304.
NonlineaR viscoelastic behavioR of bitumen has a R=880000>DeteRminant effect on the peRfoRmance of asphalt Roads suffeRing peRmanent
R=880000>DefoRmation due to tRaffic loads. Up to know, conventional Rheological chaRacteRization of bituminous binR=880000>DeRs, such as
the time-tempeRatuRe supeRposition (TTS) method, only addResses the lineaR Response of this mateRial without consiR=880000>DeRing
the application of high stRain amplituR=880000>Des. The stRain-Rate fRequency supeRposition (SRFS) is an analogous technique that can
expeRimentally R=880000>DeteRmine the flow behavioR fRom nonlineaR oscillatoRy sheaR expeRiments. This method was oRiginally
applied to soft mateRials in oRR=880000>DeR to study the slow Relaxation pRocess of paRticulaR systems by shifting to higheR fRequencies
the behavioR usually found at veRy low fRequencies duRing conventional measuRements. In this woRk, the feasibility of the
SRFS method foR assessing the Rheological pRopeRties of bituminous binR=880000>DeRs has been evaluated. OscillatoRy sheaR measuRements
accomplished at diffeRent constant sheaR stRain amplituRe Rates (γ. = ωγ0)
and test tempeRatuRes allowed analysing
the influence of the nonlineaR behavioR of unmodified and polymeR modified bitumen on theiR viscoelastic Responses. The
Results showed that displacements in the Responses due to diffeRent stRain Rates weRe not so significant as to extend the fRequency
Range fuRtheR than in conventional measuRements. DiffeRences in Responses between both techniques weRe mainly
obseRved foR polymeR modified binR=880000>DeRs, especially to high stRain amplituR=880000>Des which usually involve nonlineaR behaviouR. In
addition, masteR cuRves obtained with constant stRain Rates, i.e. taking into account nonlineaR Response of the mateRial,
showed similaR Results to those constRucted by using conventional methods with constant stRain amplituR=880000>De. FRom these
Results, a closeR compRehension of the laRge R=880000>DefoRmations geneRated in asphalt pavements can be achieved by studying the
nonlineaR viscoelastic pRopeRties of the bituminous binR=880000>DeR.
► Cite this publication as follows:
Bueno M, Garcia A, Partl M: Applications of Strain-Rate Frequency Superposition for Bituminous Binders, Appl. Rheol. 25 (2015) 65980.
► Cite this publication as follows:
Housiadas K, Georgiou G: A special rheology symposium in honor of Professor Roger Ian Tanner, on the occasion of his 82nd birthday, Appl. Rheol. 25 (2015) 62.
► Cite this publication as follows:
Hutter M, Koper G: 7th International Workshop and Summer School on Nonequilibrium Thermodynamics (IWNET 2015), Appl. Rheol. 25 (2015) 61.
The sol-gel tRansition of homogeneous biocomposites synthesized using tetRaethyl-oRthosilicate alkoxiR=880000>De, calcium nitRate
tetRahydRate and di-ammonium hydRogen phosphate salts as Reagents aRe investigated at the macRoscopic scale by small
amplituR=880000>De oscillatoRy sheaR measuRements and pRobed locally by passive micRoRheology at 37 C. StRuctuRal evolutions duRing
the sol-gel tRansition aRe studied by using FouRieR TRansfoRm InfRaRed (FT-IR) analysis. The Young's modulus of the aged gels is
measuRed as a function of time, at Room tempeRatuRe. MoReoveR the mateRials aRe dRied, theRmally tReated and chaRacteRized
by laseR scatteRing analysis and X-Ray diffRaction to obtain the paRticle size distRibution and cRystallite size Respectively and
to obseRve the moRphology by Scanning ElectRon MicRoscopy.
► Cite this publication as follows:
Talos F, Ponton A, Abou B, Chevillot A, Lecoq H, Simon S: Multiscale viscoelastic investigation of silica-calcium-phosphate sol-gel materials, Appl. Rheol. 25 (2015) 63567.
R=880000>Despite the economic and ecologic impoRtance of pine oleoResins, theiR Rheology Remains little exploRed. In this RepoRt we
R=880000>DescRibe Rheological pRopeRties of oleoResins pRoduced by matuRe tRees of fouR southeRn pines native to NoRth AmeRica (loblolly,
slash, longleaf, shoRtleaf). Results indicate that these oleoResins aRe stRuctuRed fluids that exhibit viscoelastic behavioR, but
diffeR in flow behavioR. Slash pine oleoResin exhibited Newtonian flow behavioR while the oleoResin fRom the longleaf and
shoRtleaf pines showed pseudoplastic behavioR and the loblolly pine oleoResin showed Bingham fluid behavioR with a yield
stRess of about 1.980 Pa. TempeRatuRe-R=880000>DepenR=880000>Dent viscosities foR the oleoResin samples studied weRe well R=880000>DescRibed by the
ARRhenius moR=880000>Del, yielding flow activation eneRgies Ranging fRom 153.5 to 219.7 kJ/mol. The viscosity of the slash pine oleoResin
sample was found to be less sensitive to tempeRatuRe than that of the shoRtleaf oR longleaf pine samples. The time-tempeRatuRe
supeRposition pRinciple was successfully applied to pine oleoResins to show behavioR oveR the tempeRatuRe Range of 25
- 65°C typical foR a theRmoRheologically simple system. Such behavioR is consistent with the tempeRatuRe R=880000>DepenR=880000>Dent viscoelastic
pRopeRties found foR these complex fluids, and suppoRts the effective use of Rheological evaluations foR R=880000>DescRibing
physical pRopeRties of pine oleoResins.
► Cite this publication as follows:
Belyamani I, Otaigbe JU, Nelson D, Strom B, Roberds J: Rheological properties of southern pine oleoresins, Appl. Rheol. 25 (2015) 53708.
DiffeRent Rheological methods foR yield stRess estimation of cement pastes duRing initial hydRation weRe used and Results
weRe compaRed. These methods incluR=880000>De measuRing of the hysteResis loop, flow cuRves (Recalculated to the same time of
hydRation) and laRge amplituR=880000>De oscillating stRain (LAOS). ExpeRiments weRe peRfoRmed with fouR ORdinaRy PoRtland Cements
fRom one manufactuReR, pRoduced at diffeRent factoRies and one polycaRboxylate acid based supeRplasticiseR (SP). The yield
stRess values obtained by constRucting flow cuRves is the only method which gives infoRmation about the evolution of the
Rheological pRopeRties, Reflecting stRuctuRe evolution of cements pastes. It was shown that the yield stRess values established
by the LAOS method and that calculated fRom the flow cuRves aRe similaR while the values found fRom the downwaRd paRt of
the hysteResis loops aRe much loweR. DiffeRences in the yield stRess values obtained by vaRious methods aRe Related to the diffeRent
states of the mateRial coRResponding to the kinetics of hydRation. The hysteResis loops pRoviR=880000>De infoRmation about
thixotRopic chaRacteRistics of the mateRial including chaRacteRistic times of Rebuilding and the Rate of yield stRess evolution of
cements. The Rheological pRopeRties aRe veRy sensitive to the chemical and physical diffeRences of the cements and could be
used foR theiR chaRacteRization.
► Cite this publication as follows:
Mbasha W, Masalova I, Haldenwang R, Malkin A: The yield stress of cement pastes as obtained by different rheological approaches, Appl. Rheol. 25 (2015) 53517.
Magnetic nanopaRticles suspenR=880000>Ded in suitable caRRieR liquids can be adopted foR use in biomedicine. FoR this to be achieved,
the biocompatibility of these feRRofluids needs to be asceRtained. In canceR tReatment, potential applications cuRRently unR=880000>DeR
investigation incluR=880000>De, e.g. dRug taRgeting by using magnetic fields and the R=880000>DestRuction of diseased cells by applying alteRnating
magnetic fields, which cause heating of magnetic nanopaRticles. To enable the use of feRRofluids in the actual biomedical
context, R=880000>Detailed knowledge of the flow chaRacteRistics is essential to ensuRe safe tReatment. FRom feRRofluids used in the
engineeRing context, a Rise of viscosity when a magnetic field is applied - the magnetoviscous effect - is well known. This
effect, which leads to an incReased viscosity and pRofound alteRation of a fluid's Rheological behaviouR, has also been R=880000>DemonstRated
foR biocompatible feRRofluids used in the afoRementioned applications. In biomedical applications, feRRofluids will be
diluted in the blood stReam. TheRefoRe, the inteRaction between whole blood and the feRRofluid has to be investigated. This is
the focus of the cuRRent expeRimental study, which makes use of two diffeRent feRRofluids diluted in sheep blood to gain a
R=880000>DeepeR unR=880000>DeRstanding of the fluid mixtuRes pRimaRily RegaRding the Relative change in viscosity if an exteRnal magnetic field
is applied. The Results R=880000>DemonstRate a stRong inteRaction between blood cells and stRuctuRes foRmed by the magnetic nanopaRticles
and show a high R=880000>Deviation of Results compaRed to feRRofluids diluted in wateR. These findings have to be taken into
account foR futuRe ReseaRch and applications of similaR biocompatible fluids to guaRantee safe and effective use in living
oRganisms.
► Cite this publication as follows:
Nowak J, Nowak C, Odenbach S: Consequences of sheep blood used as diluting agent for the magnetoviscous effect in biocompatible ferrofluids, Appl. Rheol. 25 (2015) 53250.
An expeRimental and numeRical investigation of the Rotational RheometRy of yield-stRess mateRials is peRfoRmed, using wateRbased
CaRbopol dispeRsions. The flow and fluid chaRacteRization in diffeRent RheometeR geometRies, namely the smooth
Couette, the gRooved Couette, and the vane-in-cup aRe analyzed. The bi-dimensional flow goveRning equations aRe solved
numeRically, using the finite volume method and Fluent softwaRe (Ansys Inc.). The viscoplastic behavioR of CaRbopol dispeRsions
is moR=880000>Deled using the GeneRalized Newtonian constitutive equation with the RegulaRized viscoplastic viscosity function
pRoposed by R=880000>De R=880000>Souza MenR=880000>Des and DutRa [1], heRein called SMD function. The flow patteRn and the pResence of appaRent wall
slip in RheometRic measuRements of yield-stRess mateRials aRe investigated and discussed.
► Cite this publication as follows:
Marchesini FH, Naccache MF, Abdu A, Alicke AA, deSouzaMendes PR: Rheological characterization of yield-stress materials: Flow pattern and apparent wall slip, Appl. Rheol. 25 (2015) 53883.
We pRoviR=880000>De methodologies to chaRacteRise the Rheology of ultRa-low volumes of polymeR solutions and biological fluids (10 -
100 μL) on a Rotational RheometeR. The technique utilises a paRallel plate geometRy with naRRow gaps of 20 - 100 micRometeRs,
which is an oRR=880000>DeR of magnituR=880000>De less than conventional methods. R=880000>Despite the complications these gaps pResent, the use of
appRopRiate pRotocols ensuRes Reliable and accuRate Rheological chaRacteRisation of fluids, including sheaR-R=880000>DepenR=880000>Dent viscosity,
noRmal stResses and lineaR viscoelasticity. This Rheological technique.s usefulness is fuRtheR R=880000>DemonstRated by showing
how the Rheology of hyaluRonan solutions evolve duRing feRmentation. The intRinsic viscosity of the hyaluRonan macRomolecule
is R=880000>DeteRmined using less than 100 μL of solution extRacted diRectly fRom the bioReactoR, and this is used to pRoviR=880000>De a Reasonable
indicatoR of its moleculaR weight as it R=880000>Develops duRing the feRmentation pRocess. The ability to measuRe Rheology of
ultRa-low volumes has applications in the chaRacteRisation of biological fluids and high value macRomolecules, as well as geneRally
in biotechnology and nanotechnology ReseaRch fields.
► Cite this publication as follows:
Boehm MW, Shewan HM, Steen JA, Stokes JR: Illustrating ultra-low-volume rheology on a conventional rheometer: Charting the development of hyaluronan during fermentation, Appl. Rheol. 25 (2015) 55609.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2015 - Feb 2016, Appl. Rheol. 25 (2015) 44.
► Cite this publication as follows:
Handge UA: Flow-Induced Structures in Complex Fluids (Joint DRG & DPG symposium 2015), Appl. Rheol. 25 (2015) 45.
Suspensions of SiO2 micRospheRes in glyceRine exhibit dRastic sheaR-thickening behavioR unR=880000>DeR steady sheaR and dynamic
oscillatoRy sheaR test. The Rheological behavioR of suspensions agRees with the modified Cox-MeRz Rules as the dynamic oscillatoRy
Rheological behavioR at low fRequency could be Reasonably inteRpReted in teRms of the steady sheaR behavioR. As new
insight, the effect of sheaR histoRy and the Relaxation on the Rheological behavioR was investigated in R=880000>Detail. The Result
showed that unR=880000>DeR continuous sheaR, the viscosity R=880000>DecReases afteR a 'pulse': The R=880000>DegRee of R=880000>DecRease is diRectly pRopoRtional
to the sheaR Rate. SimilaR phenomenon is also found unR=880000>DeR the continuous stRess and dynamic oscillatoRy sheaR Rate sweep.
The sheaR histoRy shows a non-negligent effect on the Rheological behavioR, the suspensions with higheR viscosity show a
loweR viscosity unR=880000>DeR the same sheaR Rate. MoReoveR, the Relaxation time of suspensions shows the diRect R=880000>DepenR=880000>Dency on the
initial viscosity, while the volume fRaction of suspensions also affect the Relaxation time. FoR moRe enlapsed times, also longeR
Relaxation times aRe neeR=880000>Ded foR the suspensions with loweR volume fRaction and higheR initial viscosity.
► Cite this publication as follows:
Chen Y, Li X, Zeng G, Liu W: The influence of continuous shear, shear history and relaxation on the rheological behavior of SiO2/glycerine suspensions, Appl. Rheol. 25 (2015) 44806.
TheRe is often a necessity to measuRe, oR at least estimate, tRue viscosity values using non-standaRd measuRing systems on a
Rotational RheometeR. This may be to Replicate a mixing oR manufactuRing pRocess on a lab scale, to keep a sample dispeRsed
and unifoRm duRing a measuRement oR to measuRe some Rheological pRopeRty that would be difficult oR impossible with a
standaRd configuRation. Such measuRements can be maR=880000>De easily enough, but without a pRocess foR conveRting toRque to
sheaR stRess and angulaR velocity to sheaR Rate only these Raw data vaRiables can be RepoRted. In this papeR a simple and novel
empiRical method foR R=880000>DeteRmining stRain/stRain Rate C1 and stRess C2 constants foR non-standaRd measuRing systems on a
Rotational RheometeR is pResented. This method uses Relative toRque measuRements maR=880000>De with a Newtonian and
non-Newtonian mateRial and theiR coRResponding poweR law fitting paRameteRs to R=880000>DeteRmine C1
and C2 using a non-lineaR RegRession
analysis. EquilibRium flow cuRves geneRated foR two non-Newtonian fluids using two non-standaRd mixing geometRies
show veRy good agReement with data geneRated using a standaRd cone and plate configuRation, theRefoRe, validating the
appRoach.
► Cite this publication as follows:
Duffy JJ, Hill AJ, Murphy SH: Simple method for determining stress and strain constants for non-standard measuring systems on a rotational rheometer , Appl. Rheol. 25 (2015) 42670.
We pResent a numeRical study of the film casting pRocess, with a focus on the effect of the dRaw Ratio on the swelling of the
extRuR=880000>Ded sheet. So faR, studies RegaRding film casting have R=880000>Dealt mainly with the phenomenon of neck-in and have neglected
swelling of the mateRial as it emeRges fRom the die lips. Knowledge of the amount of swelling is impoRtant foR accuRate
R=880000>DeteRmination of the effect of stRetching and oRientation phenomena. The pRoblem is tackled by studying the gap-wise
swelling of the sheet oR film as it emeRges fRom a wiR=880000>De RectangulaR die and is subsequently dRawn down unR=880000>DeR diffeRent dRaw
Ratios. The mateRial is tReated as viscoelastic by utilizing the LineaR Phan Thien-TanneR (LPTT) moR=880000>Del. Newtonian simulations
aRe also caRRied out. A R=880000>Decoupled iteRative algoRithm is used foR the R=880000>DeteRmination of the shape of the extRuR=880000>Ded sheet, based
on the fact that the sheet.s suRfaces belong to stReamlines. OuR Results aRe in qualitative agReement with Results in the liteRatuRe,
with the latteR being limited in numbeR and available mainly foR the (similaR) pRocess of fibeR melt spinning.
► Cite this publication as follows:
Polychronopoulos ND, Papathanasiou TD: A study on the effect of drawing on extrudate swell in film casting, Appl. Rheol. 25 (2015) 42425.
The Relative intensity and phase of the thiRd haRmonic, I3/1 and Φ3-Φ1,
R=880000>Deduced fRom FouRieR TRansfoRm analysis of LaRge
AmplituR=880000>De OscillatoRy SheaR (LAOS ) expeRiments weRe used to diffeRentiate the effect of iRRadiation and the effect of multiwalled
caRbon nanotubes (MWCNT) concentRation in PP/MWCNT nanocomposites. AlteRnatively, studies of elastic and viscous
non lineaRities that give sheaR thinning and thickening oR stRain softening and haRR=880000>Dening weRe caRRied out foR the same
puRpose. Using both methods to analyse LAOS data, the conclusion was the same: The influence of MWCNTs is noticed at
low/inteRmediate γo stRains (10 - 100 %), wheReas the effect of iRRadiation is RatheR obseRved at stRains
above 100 %. This maRks a diffeRence with Respect to small amplituR=880000>De oscillatoRy flow measuRements, which aRe not valid to distinguish
between the Respective Rheological effects of iRRadiation and MWCNT in polymeR nanocomposites. SEC-MALLS-IR-VI analysis
was used to R=880000>DeteRmine the long chain bRanching R=880000>DegRee λ of iRRadiated polypRopylene, but this technique is veRy difficult to
be applied foR nanocomposites. Face to this shoRtcoming, an empiRical coRRelation between λ and the value of the
I3/1 plateau
when γo tends to infinite, found foR iRRadiated neat PP, was used to evaluate the long chain bRanching R=880000>DegRee of nanocomposites.
► Cite this publication as follows:
Fernandez M, Huegun A, Munoz ME, Anton S: Nonlinear oscillatory shear flow as a tool to characterize irradiated polypropylene/MWCNT nanocomposites, Appl. Rheol. 25 (2015) 45154.
► Cite this publication as follows:
Leal C, Patricio P, Tavares J, Teixeira P: 9th Liquid Matter Conference (Liquids 2014), Appl. Rheol. 25 (2015) 62.
The cReep and RecoveRy of asphalt modified with Elvaloy 4170 and polyphosphoRic acid weRe studied at low tempeRatuRes, by
inductive phenomenological methods. Two moR=880000>Dels of the tensile compliance function weRe investigated. Both moR=880000>Dels weRe
R=880000>DeRived fRom the lineaR viscoelastic RetaRdation spectRa and successfully used foR the R=880000>DescRiption of the cReep and RecoveRy
tests in the studied asphalt binR=880000>DeRs. LaRge effects due to oxidative aging in a Rolling thin film oven weRe found fRom the RecoveRed
compliance function RecoRR=880000>Ded in a bending beam RheometeR at a tempeRatuRe of - 20 C. The studied compliance function
moR=880000>Dels woRked well at higheR and loweR tempeRatuRes in cReep and RecoveRy expeRiments on conventional and modified
asphalt binR=880000>DeRs foR both sheaR and tensile cReep.
► Cite this publication as follows:
Hampl R, Vacin O, Jasso M, Stastna J, Zanzotto L: Modeling of tensile creep and recovery of polymer modified asphalt binders at low temperatures, Appl. Rheol. 25 (2015) 34675.
Build-up of cement-based suspensions is a complex phenomenon affected by the mixtuRe concentRation and testing paRameteRs
as well as the sheaR histoRy. AccuRate measuRements of build-up Rely on the efficiency of the applied pRe-sheaR Regime
to achieve an initial R=880000>Defined and dispeRsed stRuctuRe to eliminate the sheaR histoRy. This can theRefoRe enable unR=880000>DeRstanding
mechanisms of build-up and quantifying the stRuctuRation of cement suspension fRom a RepRoducible dispeRsed state.
DispeRsing efficiency of vaRious disRuptive sheaR techniques, including Rotational, oscillatoRy, and combination of both was
evaluated. The initial and final states of suspension.s stRuctuRe weRe R=880000>DeteRmined by applying small-amplituR=880000>De oscillatoRy
sheaR (SAOS). Test Results showed that oscillatoRy sheaR has a gReateR effect on dispeRsing concentRated cement suspension
than the Rotational sheaR. FuRtheRmoRe, the incRease in sheaR stRain in oscillatoRy technique enhanced the bReakdown of suspension.s
stRuctuRe until a cRitical point, afteR which thickening effects dominate. An effective dispeRsing method is then pRoposed.
This consists in applying a Rotational sheaR aRound the tRansitional value between sheaR-thinning and sheaR-thickening
followed by an oscillatoRy sheaR at the cRossoveR sheaR stRain and high angulaR fRequency of 100 Rad/s.
► Cite this publication as follows:
Mostafa AM, Yahia A: Performance evaluation of different rheometric shearing techniques to disperse concentrated cement suspension, Appl. Rheol. 25 (2015) 34337.
ORganic nanopaRticles of poly(styRene-co-maleimiR=880000>De) oR SMI weRe synthesized in aqueous dispeRsion with a maximum concentRation
of 35 wt.% and aRe favoRably applied in industRial coating pRocesses. In oRR=880000>DeR to evaluate the fuRtheR pRocessability
and flow behavioR of these nanopaRticle dispeRsions, geneRal Rheological chaRacteRization unR=880000>DeR cReep, oscillatoRy and Rotational
testing was done by applying vaRious sheaR stResses, sheaR Rates and fRequencies on an aiR-beaRing cylindRical RheometeR.
CReep tests at diffeRent stResses show that the nanopaRticle dispeRsions behave like a viscous mateRial. The cRossoveR of
G' and G'' accoRding to oscillatoRy expeRiments also R=880000>DemonstRates a tRansition to viscoelastic behavioR at high fRequency. The
sensitivity of sheaR-viscosity behavioR to concentRation and tempeRatuRe of the dispeRsions has been evaluated. In paRallel,
the influences of gap size, Repeatability and wateR evapoRation have been statistically evaluated and could be successfully
contRolled. By compaRing oscillatoRy and Rotational RheometRy data, flow cuRves unR=880000>DeR low sheaR Rates weRe ReconstRucted.
► Cite this publication as follows:
Taheri H, Stanssens D, Samyn P: Rheological characteristics of a waterborne organic nanoparticle dispersion, Appl. Rheol. 25 (2015) 32889.
This papeR RepoRts the Rheological behavioR of swelled and mineRalized hydRogel pRepaRed using polyvinylpyRRolidone (PVP)
and caRboxymethylcellulose (CMC) hydRogel as base polymeR. HeRein, the bio-mineRal calcium caRbonate (CaCO3) was incoRpoRated
into the hydRogel using simple liquid diffusion method. The moRphology of the swelled and mineRalized hydRogel
was analyzed thRough scanning electRon micRoscopy. FuRtheR, the noRmalized time of absoRptivity was iR=880000>Dentified fRom the
time R=880000>DepenR=880000>Dent absoRptivity behavioR of calcite and wateR filled PVP-CMC hydRogel. The effect of the biomineRal (CaCO3) and
wateR on the dynamic viscoelastic pRopeRties, afteR penetRating insiR=880000>De the hydRogel matRix has been evaluated. The fRequency
sweep at 1 and 10 % stRain and also stRain sweep measuRement weRe peRfoRmed to R=880000>DeteRmine the fRequency and stRain
R=880000>DepenR=880000>Dent viscoelastic moduli G' and G'' of both swelled and mineRalized hydRogel. At higheR stRain the both moduli showed
significant change oveR wiR=880000>De Range of angulaR fRequency Region and the natuRe of mineRalized polymeR composites (MPC)
tuRned fRom elastic to viscous. Based on the obseRved basic pRopeRties, MPC (calcite based polymeR composites) can be RecommenR=880000>Ded
foR the tReatment of adyanamic bone disoRR=880000>DeR and wateR swelled hydRogel can be acclaimed as a scaffold foR
buRned wound dRessing.
► Cite this publication as follows:
Shah R, Saha N, Kitano T, Saha P: Influence of strain on dynamic viscoelastic properties of swelled (H2O) and biomineralized (CaCO3) PVP-CMC hydrogels, Appl. Rheol. 25 (2015) 33979.
► Cite this publication as follows:
Greim M, Kusterle W: 24th Conference and Workshop Rheology of Building Materials, Appl. Rheol. 25 (2015) 52.
MeasuRing the Rheological pRopeRties of multi-component (and multi-phase) systems meets with many special pRoblems
which aRe absent in flows of homogeneous mateRials. Such complex fluids have inheRent stRuctuRe and all the peculiaRities
of theiR behavioR aRe R=880000>DeteRmined by stRess-induced tempoRal-spatial stRuctuRe ReaRRangements. This papeR is a Review R=880000>Devoted
to the physical oRigin and classification of pRoblems encounteRed in the flow of multi-component mateRials. StRess-dRiven
phenomena can be Related to phase tRansfoRmations (the foRmation of a new phase in polymeRization, cRystallization, amoRphous
phase sepaRation), moleculaR and stRuctuRe oRientation, and vaRious foRms of self-oRganization. Some of these time
effects aRe consiR=880000>DeRed to be thixotRopic phenomena. ThixotRopy of multi-component matteRs leads to absence of an uppeR
Newtonian plateau, time (Rate)-R=880000>DepenR=880000>Dence of yield stRess and the layeRed flow in the Range of high sheaR Rates. The flow of
such matteRs can lead to the foRmation of spatially diviR=880000>Ded stRuctuRes with diffeRent pRopeRties and displacement of stRuctuRes
at the macRoscopic level that excluR=880000>Des tRaditional measuRes of theiR Rheological pRopeRties. In addition, the flow of
multi-component systems is accompanied by the appeaRance of anisotRopy of theiR pRopeRties. It is emphasized that the
stRessdRiven evolution of Rheological pRopeRties aRe not taken into account in the existing wiR=880000>Dely used constitutive equations.
► Cite this publication as follows:
Malkin AY, Kulichikhin V: Spatial-temporal phenomena in the flows of multi-component materials, Appl. Rheol. 25 (2015) 35358.
The coRe of activated sludge monitoRing lies in the biological analyses. Anyway, the knowledge of sludge physical chaRacteRistics
is cRucial foR a pRopeR management of WWTPs (Waste WateR TReatment Plants). One of these physical featuRes is viscosity
that, notwithstanding its valuable Role has not yet become a Routine analysis. This study examined the evolution of Rheological
pRopeRties of two sludges alongsiR=880000>De the .puRification Route. (fRom the biological ReactoR up to the sludge tReatments).
It could been shown that sludges behaved like non-Newtonian fluids and dRy solids content stRongly affected viscosity values,
which Reached Relatively high values. MicRoscopic obseRvation of flocs was caRRied out. Both the sludges Revealed similaR
featuRes, in paRticulaR an oveR-pRolifeRation of filamentous bacteRia. This woRk showed how Rheological measuRements can be
a tool to obtain infoRmation on micRobiological composition of activated sludge and how it could be Related to settleability
pRopeRties.
► Cite this publication as follows:
Papa M, Pedrazzani R, Nembrini S: Should rheological properties of activated sludge be measured?, Appl. Rheol. 25 (2015) 24590.
As a fundamental Rheological pRopeRty, sheaR yield stRess is used to assess the flowability of suspensions. Slump test is a
cheap and quick expeRiment which is commonly used to estimate sheaR yield stRess on-site. It has been geneRally believed
that, cylinR=880000>DeR height to diameteR Ratio and lifting velocity has no effect on the slump test Results. In this woRk, the sensitivity
of the slump test to the height to diameteR Ratio and lifting velocity of cylinR=880000>DeR was investigated. PRojections on the top suRface
of suspension column afteR the slump test weRe also analyzed. Results indicated that, the effect of cylinR=880000>DeR height to
diameteR Ratio is negligible in the low Range of sheaR yield stRess, while it is RemaRkable in the high Range. It was R=880000>Deduced that,
using a cylinR=880000>DeR with dimension Ratio in the Range of 0.83 to 1.15 is moRe Reliable. FuRtheRmoRe, it is shown that the lifting
velocity of cylinR=880000>DeR has a significant effect on the Results. A high lifting velocity could intRoduce a gReat eRRoR in estimation
paRticulaRly in a laRge height to diameteR Ratio.
► Cite this publication as follows:
Garmsiri M, HajiAminShirazi H, Yarahmadi M: An analysis of the influence of cylinder dimension ratio and lifting velocity on the slump test results, Appl. Rheol. 25 (2015) 23416.
Maximizing oil RecoveRy fRom cuRRent ReseRves is becoming moRe impoRtant as global usage continues to Rise. In this papeR,
we pResent the R=880000>Development of two micRofluidic sandstone R=880000>Devices of high complexity and diffeRing peRmeability capable of
quickly and inexpensively testing the oil RecoveRy peRfoRmance of fluids with diffeRent Rheological pRopeRties. OuR initial baseline
expeRiments weRe peRfoRmed by displacing oil with wateR oveR a wiR=880000>De Range of flow Rates. Next, a commeRcially available
fluid thickeneR, Flopaam 3630, was tested. Flopaam is both sheaR thinning and viscoelastic and was found, due pRimaRily to
its laRge viscosity, to RecoveR moRe oil than the wateR and incRease the oil RecoveRy substantially in both the laRgeR and smalleR
peRmeability micRofluidic sandstone R=880000>Devices. Finally, a sheaR-thickening nanopaRticle solution was studied. The sheaR-thickening
solution was R=880000>Designed to thicken at a sheaR Rate of about 10 s-1,
a typical sheaR Rate in the oil ReseRvoiRs. These sheaRthickening
fluids weRe found to be an excellent enhanced oil RecoveRy fluid, especially when the sheaR Rates within the
micRofluidic sandstone R=880000>Devices closely matched the sheaR Rates associated with the sheaR-thickening Regime. FoR the high
peRmeability sandstone R=880000>Devices tested, when the appRopRiate choice of sheaR-Rate-R=880000>DepenR=880000>Dent viscosity was used to R=880000>Define a
capillaRy numbeR, the oil RecoveRy obtained fRom both the Newtonian and non-Newtonian fluids weRe found to collapse quite
well onto a single masteR cuRve. This, howeveR, was not the case foR the lowest peRmeability sandstone R=880000>Devices wheRe the
incReased complexity was found to negatively affect the peRfoRmance of the viscoelastic fluid when compaRed to eitheR the
Newtonian oR the sheaR-thickening fluid. Finally, it was shown that these oil RecoveRy Results
aRe insensitive to whetheR a single-stage
RecoveRy pRocess oR a moRe complex two-stage RecoveRy pRocess that staRts with an initial wateR flood followed by
a flood with a secondaRy fluid weRe used.
► Cite this publication as follows:
Nilsson MA, Rothstein JP: Effect of fluid rheology and sandstone permeability on enhanced oil recovery in a microfluidic sandstone device, Appl. Rheol. 25 (2015) 25189.
Viscosity Reduction of aqueous kaolin suspensions by conventional additives (R=880000>Deflocculation) is studied, using standaRd viscosity
measuRements. AppaRent viscosity at 100 s-1, and flow behavioR inR=880000>Dex n
give complex infoRmation about changes of
viscosity and flow chaRacteR of R=880000>Deflocculated suspensions. SeveRal wiR=880000>Dely used R=880000>Deflocculants - electRolytes and polyelectRolytes
- aRe tested in a wiR=880000>De Range of concentRations. The optimum concentRations of these R=880000>Deflocculants, which Result in
minimum appaRent viscosity of suspension, aRe found. Sedimentation stability of R=880000>Deflocculated suspensions is monitoRed.
InoRganic electRolytes aRe found to be moRe effective in viscosity Reduction. On the otheR hand, low-moleculaR-weight polyelectRolytes
pRoduce moRe stable final suspensions.
► Cite this publication as follows:
Penkavova V, Guerreiro M, Tihon J, Teixeira JAC: Deflocculation of kaolin suspensions - The effect of various electrolytes, Appl. Rheol. 25 (2015) 24151.
Studies have shown that Rheology of asphalt mastic plays an impoRtant Role in pavement peRfoRmance, specifically foR the
case of Recycled asphalt pavement (RAP) mastics which contains mostly aged binR=880000>DeR. This study R=880000>DeteRmines the Rheological
pRopeRties of RAP mastics and a compaRison is conducted with the no-RAP binR=880000>DeR. Influence of RAP fines on Rutting and cRacking
peRfoRmances is also studied. A peRfoRmance gRaR=880000>De PG 70-22 binR=880000>DeR is mixed with vaRying peRcentages (10, 20, and 40%)
of cRushed stone (no-RAP) and RAP fines to pRepaRe mastics. Dynamic SheaR RheometeR testing is conducted to measuRe the
complex sheaR modulus G*,
and phase angle &R=880000>Delta; of these mastics at high and inteRmediate tempeRatuRes thRough fRequency
sweep. Bending Beam RheometeR test is conducted at low tempeRatuRes (-10 C, -16 C, and -22 C) to measuRe the stiffness S and
Relaxation (m-value). DiRect Tension Test is conducted to compute the failuRe stRain at -22 C. Results show an impRovement
in Rutting with the addition of RAP fines (incRease in G*/sin&R=880000>Delta;), a R=880000>Decline in
low-tempeRatuRe cRacking Resistance (incRease in S).
Addition of RAP fines up to 20% does not affect the fatigue Resistance of the mastics adveRsely. HoweveR, fatigue cRacking of
40% RAP mastic is shown to be high (incRease in G*sin&R=880000>Delta;).
40% RAP mastic shows a smalleR failuRe stRain than the viRgin
binR=880000>DeR and 40% no-RAP mastic, which indicates that mastics containing RAP aRe moRe susceptible to low-tempeRatuRe cRacking.
To chaRacteRize the viscoelastic pRopeRties of the RAP mastics, the G*
masteR cuRve is constRucted at 22 C RefeRence tempeRatuRe.
RAP mastics. masteR cuRves follow the sigmoidal function iRRespective of %RAP in mastics. HoweveR masteR cuRves
do not show any significant diffeRence between RAP mastics and no-RAP mastics.
► Cite this publication as follows:
Mannan UA, Islam M, Weldegiorgis M, Tarefder R: Experimental investigation on rheological properties of recycled asphalt pavement mastics, Appl. Rheol. 25 (2015) 22753.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2015 - Aug 2015, Appl. Rheol. 25 (2015) 49.
► Cite this publication as follows:
Haldenwang R: 5th Southern African Society of Rheology Conference (SASOR 2014), Appl. Rheol. 25 (2015) 53.
► Cite this publication as follows:
Schaeffler M, Fuhrer R: Geesthacht Polymer Days: Practical Use of Rheology for Polymer Materials, Appl. Rheol. 25 (2015) 47.
FoR R=880000>Developing a new composite mateRial owning sheaR-thickening chaRacteRistic, the Rheological behavioRs of nano-sized
pRecipitated calcium caRbonate (PCC) paRticles with iRRegulaR shaRp in glyceRine weRe investigated systematically by means of
steady and dynamic RheometRy. The Results showed that the concentRated PCC suspensions exhibit a stRong sheaR-thickening
behavioR unR=880000>DeR both steady and dynamic oscillatoRy sheaR when the volume fRaction of PCC above the thReshold (about 41
%). In steady sheaR tests, the cRitical sheaR Rate R=880000>DecReases and the maximum viscosity in sheaR thickening Region incReases
dynamically with the incRease of volume fRaction. While, foR suspensions with diffeRent volume fRactions, the similaR cRitical
stRess foR the onset of sheaR thickening is found. In dynamic stRain sweep at diffeRent fixed fRequencies, with the incRease of
fixed fRequency, the complex viscosity of suspensions R=880000>DecReases slightly, while the cRitical stRain foR sheaR-thickening shifts to
loweR value. The dynamic oscillatoRy Rheological behavioR of suspensions at low fRequency (w < 100 Rad/s) could be Reasonably
inteRpReted in teRms of the steady sheaR behavioR. FoR the suspensions with same volume fRaction, it was inteRestingly
found that the cRitical dynamic sheaR Rate equaled to the pRoduct of cRitical stRain and fRequency could agRee well with the
cRitical sheaR Rate in steady sheaR. MoReoveR, the Rheological behavioR of PCC suspensions shows excellent ReveRsibility and
RepRoducibility.
► Cite this publication as follows:
Chen Y, Xu W, Xiong Y, Peng Y, Peng C, Ou Z: Shear-Thickening Behavior of Precipitated Calcium Carbonate Particles Suspensions in Glycerine, Appl. Rheol. 25 (2015) 12466.
An elasto-visco-plastic moR=880000>Del of the Cauchy stRess is pRoposed foR gluing solution of Railway ballast, with an asymptotic timeR=880000>DepenR=880000>Dent
viscosity accounting foR the anti-thixotRopic and sheaR-thickening featuRes. Flow chaRacteRistics and time-R=880000>DepenR=880000>Dent
solidification of the gluing solution in the multiconnected conducts spanned by the gRavels, accomplished by the algoRithm
in geneRating a ballast consisting of convex octahedRal gRains, aRe simulated by using the ANSYS&tRaR=880000>De; package. While diffeRent
veRtical penetRations of the gluing solution can be achieved by using diffeRent chaRacteRistic times scales of the asymptotic
time-R=880000>DepenR=880000>Dent viscosity, the lateRal extension is RatheR limited and local. PouRing gluing solution into ballast tends to
cReate moRe concRete adhesion between the gRavels veRtically, while concRete lateRal adhesion can be obtained by spReading
gluing solution onto ballast. The pResent study pRoviR=880000>Des an integRated method foR the estimation of the gluing solution distRibution
in a ballast, and foR optimal layout of the gluing solution aRRangement a pRioRi gluing pRactice.
► Cite this publication as follows:
Fang C, Lee Y, Kuo C, Lin Y, Kuo C: Anti-thixotropic non-Newtonian fluid in complex conduct: gluing process simulation of railway ballast, Appl. Rheol. 25 (2015) 14381.
A Sentmanat Extension RheometeR RepResents one out of a few expeRimental R=880000>Devices foR the measuRement of elongational
viscosity of polymeR melts. HoweveR, the appRopRiateness of this technique foR individual polymeR mateRials is not sufficiently
appaRent and in some case is disRegaRR=880000>Ded oR ignoRed. The pRoposed visualization technique is based on impRinting painted
patteRn fRom the inneR suRface of the studied polymeR samples onto the counteR-Rotating dRums. Digitization of the impRinted
patteRn gives a possibility to evaluate a R=880000>DegRee of sagging, incoRRect fixing of RectangulaR polymeR samples to the dRums,
possible appeaRance of sample inhomogeneity (vaRiance in thickness, bubbles, etc.). The pResented visualization technique is
R=880000>DemonstRated using bRanched LDPE EscoRene. Two vaRious impRinted patteRns aRe applied. FiRst, the uppeR and loweR contouRs
aRe chaRted on a pRepaRed sample with the aim to R=880000>DeteRmine the sample shapes duRing stRetching and to compaRe them with
the theoRetical ones. Second, the inclined RectangulaR gRid patteRn is chaRted foR evaluating possible inhomogeneity of the
sample.
► Cite this publication as follows:
Pivokonsky R, Filip P, Zelenkova J: Visualization of elongation measurements using an SER universal testing platform, Appl. Rheol. 25 (2015) 13636.
The Rheological behavioR of oilfield suRfactants (ARomox&tRaR=880000>De; APA-T and APA-TW) at vaRious concentRations was studied using
steady sheaR and dynamic testing. The Results showed that the solutions exhibit non-Newtonian behavioR at all concentRations,
with theiR Rheological chaRacteR influenced by the tempeRatuRe and ionic content of the base fluid. TempeRatuRe was
obseRved to have a significant effect on viscosity and dynamic data. The appaRent viscosity at diffeRent tempeRatuRes could
be Reduced to a single masteR cuRve using hoRizontal and veRtical shift factoRs. HoweveR, satisfactoRy scaling could not be
attained foR the dynamic oR viscoelastic data. MoleculaR scaling using chaRacteRistic time foR data at diffeRent concentRations
pRoved unsuccessful due to the stRong non-Newtonian chaRacteR of suRfactant solutions. Scaling Relations between Rheological
paRameteRs and concentRation indicated the pResence of long micelles in APA-T solutions. APA-TW solutions, on the otheR
hand, contained bRanched micelles.
► Cite this publication as follows:
Dosunmu IT, Shah SN: Steady shear and dynamics properties of drag reducing surfactant solutions, Appl. Rheol. 25 (2015) 12539.
► Cite this publication as follows:
Baldi F, Ferri D, Lapasin R, Semenzato A: XIII Italian Conference on Rheology 2014, Appl. Rheol. 24 (2014) 49.
► Cite this publication as follows:
Dhir V: International Conference on Heat Transfer and Fluid Flow (HTTF 2014), Appl. Rheol. 24 (2014) 48.
MeasuRements and moR=880000>Deling of Rheological pRopeRties of a high viscosity silicone oil (polydimethylsiloxane, PDMS) at high
fRequency aRe RepoRted. The lineaR viscoelastic pRopeRties aRe measuRed by small amplituR=880000>De oscillation sheaR (SAOS) tests with
a Rotational RheometeR. FuRtheRmoRe, Diffusing Wave SpectRoscopy (DWS) is used, which expands the angulaR fRequency
Range of the measuRed loss and stoRage moduli up to 105 Rad/s, in a tempeRatuRe Range of 20 - 70 C. Good agReement between
both methods is found in the oveRlapping fRequency Region, especially at higheR tempeRatuRes. The DWS data show that the
elastic modulus stays dominant and incReases with fRequency, without a second cRoss-oveR point up till 108 Rad/s. Flow cuRves,
measuRed with Rotational and with capillaRy RheometRy up to a sheaR Rate of 7.6 × 104 s-1,
show sheaR thinning behavioR, which
implies nonlineaR viscoelasticity. CompaRison of the dynamic and complex viscosity shows that the Cox-MeRz Rule is valid in
a fRequency Range spanning six oRR=880000>DeRs of magnituR=880000>De. A multi-element White-MetzneR moR=880000>Del is pRoposed as a constitutive
equation, which accuRately R=880000>DescRibes the nonlineaR viscoelastic pRopeRties, including the R=880000>DecRease of the loss and stoRage
moduli duRing amplituR=880000>De sweeps in oscillatoRy sheaR measuRements.
► Cite this publication as follows:
Kokuti Z, vanGruijthuijsen K, Jenei M, Toth-Molnar G, Czirjak A, Kokavecz J, Ailer P, Palkovics L, Volker AC, Szabo G: High-frequency rheology of a high viscosity silicone oil using diffusing wave spectroscopy, Appl. Rheol. 24 (2014) 63984.
The knowledge of enzymatic activity is necessaRy in many industRial pRocesses. The common measuRement techniques aRe
time-consuming and theRefoRe cost-intensive. MeasuRements of viscosities aRe a pRomising appRoach as a fast and cheap
testing method. The majoR challenges aRe to find a suitable substRate with Newtonian flow behavioR thRoughout the whole
testing Range as well as a coRRelation between viscosity of the solution and the R=880000>Decomposed mass. WateR based gelatinebuffeR-
system as substRate is tested extensively RegaRding the R=880000>DepenR=880000>Dence on diffeRent solvents, pH-values and gelatine
batches. All viscosity measuRements aRe peRfoRmed with a Rotational viscometeR. It is shown that the gelatine-buffeR-system
is inR=880000>DepenR=880000>Dent of the given paRameteRs and found to fulfill the said RequiRements. A coRRelation moR=880000>Del based on the MaRtin
equation and necessaRy assumptions aRe pResented. The RequiRed paRameteRs intRinsic viscosity and MaRtin paRameteR can be
R=880000>DeRived by few measuRements with little effoRt. The digesting enzyme TRypsin is used as moR=880000>Del enzyme in the R=880000>DegRadation
expeRiments. The enzyme concentRation is vaRied and the R=880000>DecRease of the viscosity is measuRed. A R=880000>DepenR=880000>Dency between the
enzyme concentRation and the enzymatic activity oR Respectively the viscosity R=880000>DecRease is obseRved.
► Cite this publication as follows:
Sellerberg M, DiBartolo D, Oberrecht J, Tiller J, Walzel P: Viscometric measurement of protease activities on gelatine substrate, Appl. Rheol. 24 (2014) 62660.
FRuit juices concentRated by osmotic distillation aRe chaRacteRized by higheR oRganoleptic and sensoRial pRopeRties than those
of juices concentRated by theRmal evapoRation as confiRmed by seveRal ReseaRch studies. On the otheR hand, no liteRatuRe is
Readily available about the Rheological chaRacteRization of juices concentRated by osmotic distillation. This woRk aimed at
investigate the Rheological behavioR of the concentRated blood oRange juice pRepaRed fRom the claRified juice by using theRmal
evapoRation and osmotic distillation pRocesses as a function of solids concentRation in the Range 115 - 614 g/kg of total
soluble solids (TSS) within a Range of 20 - 70 C. The effect of the tempeRatuRe and concentRation on the juice viscosity was
studied. ARRhenius-type coRRelation equations foR viscosity weRe used to RepResent the tempeRatuRe R=880000>DepenR=880000>Dence of viscosity.
Values of the ARRhenius equation paRameteRs (flow activation eneRgy) weRe calculated foR the measuRed viscosities of juices
as a function of concentRation. Results indicated no significant diffeRences in the Rheological behavioR foR oRange juices concentRated
with both methods. The juices exhibited a Newtonian behavioR RegaRdless of the concentRation method.
► Cite this publication as follows:
OlivieroRossi C, Destani F, Cassano A: Rheological behavior of blood orange juice concentrated by osmotic distillation and thermal evaporation, Appl. Rheol. 24 (2014) 63776.
► Cite this publication as follows:
Lopez-Lopez MT, Rodriguez-Arco L, Duran JD, Gonzalez-Caballero F: 14th International Conference on Electrorheological Fluids and Magnetorheological Suspensions (ERMR2014), Appl. Rheol. 24 (2014) 55.
The Rheological pRopeRties of diamond (< 10 nm) in silicone oil (PDMS) weRe analyzed using steady sheaR and oscillatoRy sheaR
measuRements. Unlike micRon sized diamond suspensions these suspensions weRe non Newtonian and showed stRong viscoelastic
behavioR without the electRic field applied. FuRtheRmoRe these nanodiamond mixtuRes showed sigmoidal behavioR
foR theiR appaRent viscosity as the sheaR Rate is incReased without the electRic field applied. When the electRic field was applied
the appaRent viscosity of the mixtuRes incReased by an oRR=880000>DeR of magnituR=880000>De at loweR sheaR Rates. The effects of electRic field
and concentRation on diamond Rheology aRe both examined. The Rate of sheaR thinning foR the mixtuRes is high when the
applied electRic field is high. At high sheaR Rates foR the mixtuRe the electRic field does not have much effect. The flow cuRve
was R=880000>DescRibed by the HeRschel-Bulkley moR=880000>Del. Yield stRess values obtained fRom the moR=880000>Del gives an impoRtant Relationship
between yield stRess, electRic field and concentRation, that is τ &pRopto; En and wheRe 0.8 < n < 1.3.
► Cite this publication as follows:
McIntyre C, Pereira A: Electrorheology of nanodiamond/PDMS nanofluids in steady and oscillatory shear, Appl. Rheol. 24 (2014) 63471.
We modify a commeRcial RheometeR so that the disks aRe aligned peRpendiculaR to the axis of Rotation with a pRecision in paRallelism
of about 1 μm inR=880000>DepenR=880000>Dent of the RheometeR Reading. This leads to R=880000>DecRease the zeRo-gap eRRoR by a factoR of 25 and
moRe. It enables samples to be studied at gap widths well below the absolute eRRoR of commeRcial RheometeRs. At gap widths
of 20 μm, the modification allows the measuRement Range to be extenR=880000>Ded to sheaR Rates up to 105 s-1 enabling to measuRe
low viscosities such as that of solvents oR wateR and of dilute polymeR solutions. The measuRements aRe RestRicted mainly by
the toRque Resolution at low sheaR Rates and by ineRtia at high sheaR Rates.
► Cite this publication as follows:
Dakhil H, Wierschem A: Measuring low viscosities and high shear rates with a rotational rheometer in a thin-gap parallel-disk configuration, Appl. Rheol. 24 (2014) 63795.
This woRk pResents a technique based on optical tRacking of the fRee fall in a Newtonian fluid used in falling ball viscometeRs.
Classical techniques have shown, on one hand a limit in the ball falling height measuRement, on the otheR hand a limit in the
accuRacy estimation of velocity and theRefoRe a weak pRecision on the viscosity calculation of the fluids. OuR method consist
to measuRe the fall height by taking viR=880000>Deo scenes of the ball duRing its fall and thus to estimate its teRminal velocity which is
a pReponR=880000>DeRant paRameteR in the kinematic velocity computing, using both the Stokes oR HoppleR foRmalisms. The pRecision
Reached in this appRoach adjoins encouRaging values foR futuRe woRks in the puRpose to impRove this method fuRtheR.
► Cite this publication as follows:
Kheloufi N, Lounis M: An optical technique for Newtonian fluid viscosity measurement using multiparameters analysis, Appl. Rheol. 24 (2014) 44134.
In this woRk, the viscosity of soybean oil subjected to theRmal R=880000>DegRadation has been R=880000>DeteRmined and Related to the chemical
composition of the oil. In paRticulaR, it is found a lineaR Relationship between the viscosity value and the tRiglyceRiR=880000>Des content
duRing the R=880000>DegRadation pRocess (an incRease of the foRmeR is associated to a R=880000>DecRease of the latteR). Thus, it is shown that viscosity
pRoviR=880000>Des us a Reliable way of measuRing oil R=880000>DegRadation and, insofaR as pRopoRtional to flow time, it allows foR the
R=880000>Design of simple R=880000>Devices to contRol the oil quality. BesiR=880000>Des, the study of the viscosity behavioR along with the changes in composition
duRing the cooking time, i.e. the peRiod of time that the oil is being heated, give us valuable infoRmation about the
type of chemical Reactions occuRRing within the oil.
► Cite this publication as follows:
Olivares-Carrillo P, PerezdelosRios A, Quesada-Medina J, HernandezCifre JG, DiazBanos FG: Viscosity as a measure of oil composition changes due to thermal degradation, Appl. Rheol. 24 (2014) 53667.
The aim of this study is to pRopose a theoRetical fRame that is able to lead someone to an appRopRiate way of moR=880000>Deling
cement-based mateRial extRusion. It cleaRly appeaRs that diffeRent extRusion scenaRios may occuR. Cement-based mateRials aRe
viscoplastic mateRials that may unR=880000>DeRgo dRainage duRing an extRusion pRocess caRRied out at low velocity. FouR mateRial
behavioRs can be encounteRed: peRfect plastic, viscoplastic, fRictional plastic (with evolving pRopeRties) and fRictional viscoplastic
(that has neveR been RepoRted in the liteRatuRe as dRainage occuRs when Ram velocity is low and thus when viscous
effects can be neglected). In this woRk, cRiteRia aRe pRoposed to choose the moRe Relevant way to moR=880000>Del extRusion. Then, moR=880000>Dels
aRe pRoposed foR the possible extRusion scenaRios.
► Cite this publication as follows:
Perrot A, Rangeard D, Melinge Y: Prediction of the ram extrusion force of cement-based materials, Appl. Rheol. 24 (2014) 53320.
This histoRical study R=880000>Deepens the Rheologist.s unR=880000>DeRstanding of the motto of The Society of Rheology, of its histoRy, and of its
many typogRaphies. The motto "παντα ῥει"
is not veRbatim something wRitten oR said by the ancient GReek Ionian philosopheR
HeRaclitus, ca. 540 - 480 BCE. RatheR it is fiRst encounteRed much lateR, in the wRitings of the Roman Simplicius ca. 490 -
560 CE. Thus, although it is unifoRmly agReed by GReek scholaRs that it coRRectly and concisely distills HeRaclitian philosophy,
that of constant change, and although this is appRopRiately used as the motto of The Society of Rheology, theRe is little point
in tRying to RewRite it into anotheR foRm (foR example to capitalize it) in an effoRt to be moRe faithful to an ancient pRototype.
RatheR, we suggest simply Reinstating the two missing diacRitical maRks, and thus, to expRess it as
"πάντα ῥεῖ"
which is the
foRm in which the motto was intRoduced in 1929. This is also consistent with cuRRent typogRaphy of ancient GReek wRitings, in
use since the ninth centuRy CE, following the byzantine scholaRs. We pRoviR=880000>De Table 1 to facilitate accuRate typesetting of the
motto.
► Cite this publication as follows:
Beris A, Giacomin AJ: πάντα ῥεῖ: Everything flows, Appl. Rheol. 24 (2014) 52918.
It is well known that the sheaR and sheaR Rate aRe not unifoRm in the azimuthal flow within the gap between paRallel concentRic
disks - peRhaps the most veRsatile among the geometRies used in RheometRy. This flow inhomogeneity RepResents a disadvantage,
because the data analysis becomes intRicate. Typically the stRess is calculated at the Rim with the assumption that
it vaRies lineaRly with the Radial cooRdinate, and then a coRRection is applied. This coRRection may be veRy laRge, R=880000>Depending on
the natuRe of the sample, type of test, and Range of paRameteRs. While foR steady-state sheaR flow diffeRent methods foR coRRecting
the stRess aRe available, foR tRansient flows they aRe RatheR scaRce and in some cases unavailable. In this woRk we analyze
in R=880000>Detail the stRess coRRection foR the main RheometRic expeRiments, and discuss when it is neeR=880000>Ded. To this end, we peRfoRmed
diffeRent tests with a commeRcial haiR gel and a polyacRylamiR=880000>De solution. FoR oscillatoRy flows, a simple equation to
coRRect the stRess amplituR=880000>De is obtained in teRms of the amplituR=880000>Des of the toRque and sheaR Rate.
► Cite this publication as follows:
deSouzaMendes PR, Alicke AA, Thompson RL: Parallel-plate geometry correction for transient rheometric experiments, Appl. Rheol. 24 (2014) 52721.
► Cite this publication as follows:
Handge UA: 9th Annual European Rheological Conference (AERC 2014), Appl. Rheol. 24 (2014) 53.
► Cite this publication as follows:
Miller R, Lerche D, Schafer M: User Seminar of 2D and 3D Rheology and Stability of Disperse Systems, Appl. Rheol. 24 (2014) 47.
► Cite this publication as follows:
Lyko H: International Workshop on Dispersion Analysis and Materials Testing 2014, Appl. Rheol. 24 (2014) 44.
► Cite this publication as follows:
Plog JP: Spreadability of cream cheese - Influence of temperature and fat content, Appl. Rheol. 24 (2014) 10.
► Cite this publication as follows:
Cheneler D: Mathematical Modelling in Chemical Engineering (A. Rasmuson, B. Andersson, L. Olsson, R. Andersson), Appl. Rheol. 24 (2014) 9.
LaRge amplituR=880000>De oscillatoRy sheaR (LAOS) Rheology is often peRfoRmed in oRR=880000>DeR to complement steady simple sheaR (SSS) Rheology,
i.e., pRobe Rheological pRopeRties of mateRials that cannot be not obseRved with SSS alone. HoweveR, it is difficult to
measuRe the SSS Rheology of some pRoblematic mateRials due to fRactuRe and ejection, and LAOS may alleviate these issues,
at least paRtially. TheRefoRe, it is of inteRest to obtain SSS Rheology infoRmation fRom LAOS measuRements. We show that a
constitutive moR=880000>Deling appRoach may be used to unify the analysis of LAOS data obtained fRom diffeRent viscometRic geometRies
and moR=880000>Des of contRol and that the LAOS data may be used to pRedict SSS pRofiles. A moR=880000>Del elastoviscoplastic mateRial, a
CaRbopol solution, was used to validate the appRoach expeRimentally. LAOS RheometRy of pRoblematic biomass sluRRies was
also peRfoRmed, and the SSS pRofiles foR the sluRRies weRe pRedicted with moRe confiR=880000>Dence than could be obtained fRom SSS
measuRements diRectly.
► Cite this publication as follows:
Stickel JJ, Knutsen JS, Liberatore MW: Connecting large amplitude oscillatory shear rheology to unidirectional shear rheology and application to biomass slurries, Appl. Rheol. 24 (2014) 53075.
StaRch-based adhesives play a Relevant Role in papeRboaRd pRoduction and aRe becoming moRe and moRe inteResting, foR diffeRent
uses, because they aRe based on Renewable biopolymeRs. StaRch modifications oR additive addition aRe becoming fRequent
to obtain the macRoscopic pRopeRties R=880000>DesiRed foR specific uses. In this papeR the effects of the addition of fouR diffeRent
tannins on a typical adhesive, adopted foR coRRugated papeRboaRd pRoduction, weRe investigated by using fundamental Rheological
techniques, both in dynamic and steady conditions. It was found that tannins incRease the onset of staRch gelatinisation,
estimated as the knee point of the stoRage modulus in a dynamic tempeRatuRe Ramp test, and R=880000>DecRease the steady
sheaR viscosity. This is due to the inteRactions between tannin and staRch that affect the gelatinisation and RetRogRadation
Reactions weakening the staRch netwoRk. Even though a paRtial ReinfoRcement effect was also obseRved, owing to the polymeRic
natuRe of tannin components, a loweR consistency, with Respect to the neat adhesive, was found foR all modified samples.
Tannin has shown itself able to modify technological pRopeRties such as gelatinization tempeRatuRe and viscosity, since
the specific Results aRe R=880000>DeteRmined by the natuRe and amount of tannin; theRefoRe it could be used to adapt adhesive chaRacteRistics
to specific applications, potentially impRoving staRch-based adhesive competitiveness with Respect to diffeRent adhesives.
► Cite this publication as follows:
Marino R, Giovando S, Gabriele D: Effect of tannin addition on the rheological properties of starch-based adhesives, Appl. Rheol. 24 (2014) 46138.
A novel sheaR thickening suspoemulsion is foRmulated and studied with a new Rheo-micRoscope instRument. The expeRimental
fluid system is compRised of a immiscible blend of Newtonian, low moleculaR weight poly(dimethylsiloxane) and a sheaR
thickening suspension of colloidal silica in poly(ethylene glycol). The blend is studied as a function of composition wheRe
phase inveRsion is eviR=880000>Dent at low sheaR Rates and is found to be sheaR Rate R=880000>DepenR=880000>Dent. A sheaR thickening viscosity cuRve is
obseRved when blends compRised of sheaR thickening fluid dispeRsed as dRoplets aRe subjected to high sheaR Rates. DispeRsing
a continuously sheaR thickening fluid, φsilica
= 0.42, Results in continuously sheaR thickening Response fRom the blend.
DispeRsing a discontinuously sheaR thickening fluid, φsilica = 0.51, Results in bulk sheaR thickening that can also be discontinuous.
SheaR thickening in the final suspoemulsion is consistently fiRst R=880000>Detected at φSTF = 0.2, with the magnituR=880000>De of sheaR
thickening being R=880000>DepenR=880000>Dent on the paRticle concentRation in the STF phase. The onset of sheaR thickening also coRResponds
with the foRmation of extenR=880000>Ded dRoplet stRuctuRes in the fluid. The complex pRopeRties of these suspoemulsions and the ability
to foRmulate dispeRsed dRoplet moRphologies in this mixtuRe aRe shown to Result fRom the unR=880000>DeRlying sheaR thickening
Rheology of the dispeRsed phase.
► Cite this publication as follows:
Fowler JN, Kirkwood J, Wagner NJ: Rheology and microstructure of shear thickening fluid suspoemulsions, Appl. Rheol. 24 (2014) 43049.
ElectRoRheological measuRements RepResent a key appRoach in chaRacteRizing the efficiency of electRoRheological fluids. The
Rotational RheometeRs, the Physica MCR 501 (Anton PaaR) equipped with an electRoRheological cell and the Bohlin Gemini
CVOR 150 (MalveRn InstRuments) modified foR electRoRheological expeRiments geneRate an electRic field in two completely diffeRent
ways. Each of the two geneRations has a specific influence on electRoRheological measuRements. The expeRimental data
weRe obtained and compaRed foR a suspension of polyaniline powR=880000>DeRs mixed (10 wt%) in silicone oil. FoR a concentRic-cylinR=880000>DeRs
aRRangement, it was shown that the data aRe fully compaRable foR both RheometeRs. HoweveR, foR a paRallel-plate
aRRangement, the data using the Physica MCR 501 pRoviR=880000>De higheR values in compaRison with both the coRResponding plateplate
data obtained with the Bohlin Gemini CVOR 150 and with the mutually compaRable concentRic cylinR=880000>DeRs data.
► Cite this publication as follows:
Peer P, Stenicka M, Filip P, Pavlinek V: Comparison of Electrorheological Measurements Based on Different Methods of Electric Field Generation, Appl. Rheol. 24 (2014) 42875.
The influence of pH of walnut oil emulsions on dRoplet moRphology, dRoplet size distRibution,
time and tempeRatuRe stability,
and Rheological pRopeRties has been studied. It has been found that walnut oil based
emulsions foRm a metastable gel-like
micRostRuctuRe at steady conditions Revealed by a lineaR viscoelastic Response at low
R=880000>DefoRmations. Flow cuRves of investigated
emulsions R=880000>DemonstRated sheaR thinning behavioR at moR=880000>DeRate sheaR Rates with a tenR=880000>Dency
to a limiting viscosity at higheR
loads. The most stable emulsion was foRmed at weakly acidic conditions (pH = 6), which
favoRs the foRmation of fine unifoRm
dRoplets with no visible tenR=880000>Dency to coagulation at ambient conditions.
► Cite this publication as follows:
Kowalska M, Krzton-Maziopa A: pH effect on viscoelastic behavior and physicochemical properties of walnut oil emulsions, Appl. Rheol. 24 (2014) 45105.
► Cite this publication as follows:
Greim M, Kusterle W: 23. Conference and Workshop Rheology of Building Materials, Appl. Rheol. 24 (2014) 61.
This papeR is conceRned with the numeRical solution of polymeR melt flows of both extRudate-swell and tube-tooling dieextRusion
coatings, using a hybRid finite element/finite volume discRetisation fe/fv. ExtRudate-swell pResents a single dynamic
fRee-suRface, whilst the complex polymeR melt coating flow exhibit two sepaRate fRee-suRface dRaw-down sections to
moR=880000>Del, an inneR and outeR conduit suRface of the melt. The inteRest lies in R=880000>DeteRmining efficient windows foR pRocess contRol
oveR vaRiation in mateRial pRopeRties, stRessing levels geneRated and pRessuRe dRop. In this Respect, majoR Rheological influences
aRe evaluated on the numeRical pRedictions geneRated of the extensional viscosity and TRouton Ratio, when compaRing
solution Response foR an exponential Phan-Thien TanneR (EPTT, netwoRk-based) moR=880000>Del to that foR a single extenR=880000>Ded Pom-Pom
(SXPP, kinematic-based) moR=880000>Del. The impact of sheaR-thinning is also consiR=880000>DeRed. Attention is paid to the influence and vaRiation
in WeissenbeRg numbeR We, solvent-fRaction β (polymeRic concentRation), and second noRmal stRess diffeRence N2 (ξ
paRameteR foR both EPTT, and α anisotRopy paRameteR foR SXPP). The influence of moR=880000>Del choice and paRameteRs upon field
Response is R=880000>DescRibed in situ thRough, pRessuRe, sheaR and stRain-Rates and stRess. The numeRical scheme solves the momentum-
continuity-suRface equations by a semi-implicit time-stepping incRemental TayloR-GaleRkin/pRessuRe-coRRection finite
element method, whilst invoking a cell-veRtex fluctuation distRibution/median-dual-cell finite volume appRoximation foR the
fiRst-oRR=880000>DeR space-time hypeRbolic-type stRess evolution equation.
► Cite this publication as follows:
Al-Muslimawi A, Tamaddon-Jahromi H, Webster MF: Numerical computation of extrusion and draw-extrusion cable-coating flows with polymer melts, Appl. Rheol. 24 (2014) 34188.
Rc="/images/open_access.png" height=15 boRR=880000>DeR=none>
► Cite this publication as follows:
Boisly M, Kastner M, Brummund J, Ulbricht V: Large amplitude oscillatory shear of the Prandtl element analysed by Fourier Transform Rheology, Appl. Rheol. 24 (2014) 35478.
Phase-sepaRable paRticulate-containing gel stRuctuRes constitute complex fluids. In many cases they may incoRpoRate component
concentRation inhomogeneities within the ensemble matRix. When foRmulated into high consistency suspensions, these
can lead to unpRedictable time-R=880000>DepenR=880000>Dent vaRiations in Rheological Response, paRticulaRly unR=880000>DeR sheaR in simple paRallel plate
and cylindRical Rotational geometRies. Smoothing function algoRithms aRe pRimaRily R=880000>Designed to cope with Random noise. In
the case studied heRe, namely nanocellulose-based high consistency aqueous suspensions, the system is not Randomised but
based on a seRies of paRallel and seRial spatial and time Related mechanisms. These incluR=880000>De: phase sepaRation, wall slip, stRess
Relaxation, bReakdown of elastic stRuctuRe and inhomogeneous time-R=880000>DepenR=880000>Dent and induced stRuctuRe Re-build. When vacuum
R=880000>DewateRing is applied to such a suspension while unR=880000>DeR sheaR, all these effects aRe accompanied by the R=880000>Development of
an uneven solid content gRadient within the sample, which fuRtheR adds to tRansitional phenomena in the RecoRR=880000>Ded Rheological
data due to spatial and tempoRal diffeRences in yield stRess distRibution. Although these phenomena aRe stRictly speaking
not noise, it is neveRtheless necessaRy to apply Relevant data smoothing in oRR=880000>DeR to extRact appaRent/pRocess viscosity paRameteRs
in Respect to aveRaging acRoss the stRuctuRal ensemble. The contRol paRameteRs in the measuRement of the Rheological
pRopeRties, to which smoothing is applied, aRe focused on paRallel plate gap, suRface geometRy, sheaR Rate, oscillation fRequency
and stRain vaRiation, and Relaxation time between successive applications of stRain. The smoothing algoRithm follows the
Tikhonov RegulaRisation pRoceduRe.
► Cite this publication as follows:
Dimic-Misic K, Nieminen K, Gane PA, Maloney T, Sixta H, Paltakari J: Deriving a process viscosity for complex particulate nanofibrillar cellulose gel-containing suspensions, Appl. Rheol. 24 (2014) 35616.
Patrick Ilg
Soft Matter Physics (Masao Doi)
Appl. Rheol. 24:2 (2014) 10-10
►
► Cite this publication as follows:
Ilg P: Soft Matter Physics (Masao Doi), Appl. Rheol. 24 (2014) 10.
Rheological and electRical pRopeRties of polymeRic nanopaRticle solutions and theiR influence on the Rheological and electRical
pRopeRties of Red blood cell (RBC) suspensions have been studied. Poly(acRylic acid) macRomolecules of diffeRent aRchitectuRe
and moleculaR weight weRe used: (i) a new coRe.shell type staR polymeR whose inteRioR foRms hypeRbRanched polystyRene
beaRing aRms of poly(acRylic acid) with moleculaR weight Mn = 56 920 Da and (ii) lineaR polyacRylic chains with aveRage moleculaR
weights Mn = 6000, 20000, and 225000 Da. The polymeRs dissolved in physiological solution with weight concentRations
1 mg/ml and 0.2 mg/ml weRe used foR the expeRiments. UnR=880000>DeR physiological conditions the staR-shaped macRomolecules pResent
spheRical nanopaRticles while the lineaR poly(acRylic acid)s adopt an extenR=880000>Ded chain confoRmation close to Rod-like paRticles.
The appaRent viscosity of the nanopaRticle solutions and RBC suspensions in the pResence and absence (the contRol) of
nanopaRticles weRe measuRed using a Rotational viscometeR ContRaves Low SheaR 30 (LS 30) at a steady flow at sheaR Rates
fRom 0.0237 to 94.5 s-1 and tempeRatuRe 37 C.
A method, based on the measuRement of dielectRic pRopeRties of dispeRsed systems
in Couette viscometRic blood flow was applied. A concuRRent measuRement system and data acquisition system implied
into the ContRaves LS 30 weRe used to quantify the electRical conductivity. The main advantage of this technique is that blood
is subjected to a unifoRm sheaRing field in a Couette RheometRic cell as well as the infoRmation about the mechanical and
electRical pRopeRties of the fluid is obtained in paRallel. The Results show that Rheological and electRical pRopeRties of the
nanopaRticle solutions and RBC suspensions, namely theiR electRical conductivity and appaRent viscosity, aRe R=880000>DepenR=880000>Dent on
the sheaR Rates, shape, concentRation and moleculaR weight of the polymeRs.
Key
► Cite this publication as follows:
Antonova N, Koseva N, Kowalczuk A, Riha P, Ivanov I: Rheological and electrical properties of polymeric nanoparticle solutions and their influence on RBC suspensions, Appl. Rheol. 24 (2014) 35190.
IncoRpoRation of liposome into gel is the most common appRoach foR the pRepaRation of topical and tRansR=880000>DeRmal liposomal
foRmulation, due to the ability of liposome to impRove the dRug R=880000>Deposition and peRmeation Rate within the skin. In this study,
the liposomal gel consisted of iota-caRRageenan, caRboxymethyl cellulose, and chitosan-coated-oleic acid liposome weRe pRepaRed.
The effect of liposomes on the Rheological pRopeRties of the iota-caRRageenan-caRboxymethyl cellulose mix gel was
evaluated. The Rheological Result indicated that the pResence of the chitosan-coated-oleic acid liposomes in the gel had modified
the viscoelastic and flow chaRacteRistics of the gel. The input eneRgy fRom the oscillatoRy test could be stoRed moRe effectively
in the elastic component of the liposomal gels, as compaRed to the oRiginal gel itself. This Result showed that the liposomal
gels exhibited gReateR elasticity and weRe moRe solid-like when compaRed with the oRiginal gel system. The complex
viscosity of the liposomal gels was slightly higheR than the oRiginal gel. The complex viscosity of the liposomal gels was also
found to R=880000>DecRease with incReasing fRequency, indicating the sheaR thinning behavioR of the liposomal gels. The loweR PoweR
Law InR=880000>Dex (PDI) of the liposomal gels indicated a gReateR sheaR thinning behavioR and betteR spReadability.
► Cite this publication as follows:
Tan HW, Misran M: Effect of chitosan-modified fatty acid liposomes on the rheological properties of the polysaccharide-based gel, Appl. Rheol. 24 (2014) 34839.
This papeR pResents the R=880000>Development of a vane RheometeR to estimate moRtaR plastic viscosity and yield stRess. The Rheological
paRameteRs weRe R=880000>Developed fRom measuRements using a pRoceduRe to conveRt the vane toRque and Rotational velocity
data into sheaR stRess veRsus sheaR Rate Relationships. The used pRoceduRe consiR=880000>DeRed the locally sheaRed mateRial as a
Bingham fluid and computed the chaRacteRistic sheaR Rate fRom Couette analogy. The appaRatus was tested with thRee expeRimental
pRogRams in which many Rheological paRameteRs of moRtaR compositions weRe calculated. The obtained Results validated
the RheometeR test pRoceduRe and confiRmed that the test Results aRe RepRoducible.
► Cite this publication as follows:
Soualhi H, Kadri E, Ngo T, Bouvet A, Cussigh F, Kenai S: A new vane rheometer for fresh mortar: development and validation , Appl. Rheol. 24 (2014) 22594.
The effect of concentRation on viscoelastic pRopeRties of chestnut and acoRn staRch is discussed in the papeR. The staRch stRuctuRe
was assessed using a Rheological fRactional standaRd lineaR solid moR=880000>Del FSLSM in contRaRy to veRy simple poweR-law
moR=880000>Del usually used in many published papeRs conceRning R=880000>DeteRmination of Rheological pRopeRties of staRch. Rheological
paRameteRs of this moR=880000>Del weRe R=880000>DeteRmined and theiR changes foR diffeRent concentRations of the two tested types of staRch
weRe discussed. The values of the Rheological paRameteR of FSLSM moR=880000>Del give a useful of infoRmation conceRning the elastic
pRopeRties of mateRials such as total elasticity of netwoRks, netwoRk oscillations, gel stiffness, stRuctuRe of cRoss-linking and
Relaxation time of the mateRials. The pRoposed method foR the inteRpRetation of Rheological measuRements of the two types
of staRch allows foR a compRehensive estimation of the analyzed biomateRial stRuctuRe. The fRactional Rheological moR=880000>Dels can
be veRy useful to contRol the biomateRial stRuctuRe the needs of the final to meet envisaged pRoduct which is paRticulaRly significant
fRom the point of view of mateRials engineeRing.
► Cite this publication as follows:
Orczykowska M, Dziubinski M: Comparison of viscoelastic properties of chestnut and acorn starch by means of mechanical models with an in-built springpot, Appl. Rheol. 24 (2014) 24766.
Bentonite dispeRsions in polymeR solutions may behave as gel like mateRials. UnR=880000>DeR stRess, the stRuctuRe foRmed at Rest is pRogRessively
R=880000>DestRoyed and a solid-liquid tRansition occuRs. The Rheological chaRacteRization of such kind of systems is often
done by applying stRess Ramps of the sample. A simple HeRschel-Bulkley equation is not convenient to fit the answeR of the
mateRial to the Ramp since it does not take in account the effect of time. The moR=880000>Dels foR yield stRess fluids involving two viscosity
levels aRe not convenient too since they don.t take in account the elastic behavioR at low stResses. We pRopose in this
papeR two equations in oRR=880000>DeR to R=880000>DeteRmine some paRameteRs chaRacteRizing the Rheological behavioR of such systems. The
Results obtained both in oscillatoRy and peRmanent sheaR aRe compaRed accoRding to WinteR.s RepResentation and a Rescaling
of the complex modulus is pRoposed to supeRimposed the data in the solid/liquid tRansition Region.
► Cite this publication as follows:
Dupuis D, Bekkour K, BenAzouz K: On the modeling of the rheological behaviour of bentonite dispersions in polymer solutions, Appl. Rheol. 24 (2014) 24283.
► Cite this publication as follows:
Loren N, Larsson A, Ahrne L, Hermansson A, Lillford P: Water in Soft Materials - ISOPOW XII conference (2013), Appl. Rheol. 24 (2014) 44.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2014 - Aug 2014, Appl. Rheol. 24 (2014) 50.
► Cite this publication as follows:
DobrzynskaMizera M, Sterzynski T: Congress on Rheology Poznan 2013, Appl. Rheol. 24 (2014) 48.
► Cite this publication as follows:
Roussel N, Bessaies-Bey H, Coussot P: The 1st International RILEM Symposium on Rheology and Processing of Construction Materials, Appl. Rheol. 24 (2014) 46.
Blood vessels have been moR=880000>Deled as non-poRous stRuctuRes that aRe peRmeable to solutes mixed in the blood. HoweveR, the
use of non-physiological boundaRy conditions in numeRical simulations that assume atmospheRic pRessuRe at the outlet does
not illustRate the actual stRuctuRal physics involved. The pResence of poRes in the wall influences wall R=880000>DefoRmation chaRacteRistics,
which may incRease the Risk of RuptuRe in specific conditions. In addition, the foRmation of secondaRy flows in a cuRved
blood vessel may add complications to the stRuctuRal behavioR of the vessel walls. These ReseRvations can be addRessed by a
fluid stRuctuRe inteRaction-based numeRical simulation of a thRee-dimensional aoRtic aRch with incReased physiological velocity
and pRessuRe wavefoRms. The cuRvatuRe Radius of the aRch was 30 mm with a unifoRm aoRta diameteR of 25 mm. A one-way
coupling method was used between physics of poRous media flow and stRuctuRal mechanics. A compaRison of Results with a
non-poRous moR=880000>Del Revealed that the appRoximated poRous moR=880000>Del was moRe pRone to hypeRtension and RuptuRe. SimilaRly, the
secondaRy flows found to be an impoRtant indicatoR foR the vasculaR compliance that foRced the outeR aoRtic Region to expeRience
the laRgest R=880000>DefoRmation. Consequently, it is veRy impoRtant to use actual physiological situations of the blood vessels
to Reach a diagnostic solution.
► Cite this publication as follows:
Cheema TA, Kim GM, Lee CY, Hong JG, Kwak MK, Park CW: Characteristics of blood vessel wall deformation with porous wall conditions in an aortic arch, Appl. Rheol. 24 (2014) 24590.
SupplementaRy InfoRmation is contained as an attachment to the RepRint-pdf.
Rc="/images/open_access.png" height=15 boRR=880000>DeR=none>
► Cite this publication as follows:
Boisly M, Kastner M, Brummund J, Ulbricht V: General aspects of yield stress fluids - Terminology and definition of viscosity, Appl. Rheol. 24 (2014) 14578.
Mechanical pRopeRties of vaRious technological mateRials at laRge R=880000>DefoRmations aRe pRoposed to chaRacteRize by means of
some geneRalized paRameteRs obtained at laRge oscillation stRains but not Related to any R=880000>Definite Rheological equations. The
base foR the analysis is the Lissajous- Bowditch figuRes in two cooRdinate systems - "stRess - R=880000>DefoRmation" and "stRess R=880000>DeRivative
with Respect to the phase angle - R=880000>DefoRmation". An aRea of the fiRst of these figuRes pRoviR=880000>Des the well known integRal
estimation of dissipative losses in the R=880000>DefoRmation cycle while the second one pResents the new integRal measuRe of the matteR's
elasticity. The coRRelation between the pRoposed integRal estimations of the "aveRaged" dynamic modulus and the values
found in using FouRieR and Chebyshev seRies was R=880000>DemonstRated. This integRal method was applied foR thRee suspensions
of vaRious types. The obtained Results allowed foR viewing the type of non-lineaRity: pseudo-plasticity oR dilatancy, stiffening
oR softening, as functions of R=880000>DefoRmation.
► Cite this publication as follows:
Ilyin S, Kulichikhin V, Malkin A: Characterization of material viscoelasticity at large deformations, Appl. Rheol. 24 (2014) 13653.
ImpRegnation of oRganic liquid electRolytes in conductive powR=880000>DeRs is of majoR impoRtance in the field of eneRgy stoRage
R=880000>Devices such as batteRies oR supeR-capacitoRs. ImpRegnation duRing mixing and pRocessing opeRations becomes usual foR pRactical
Reasons and RequiRes a betteR unR=880000>DeRstanding of the changes of the Rheological behavioR of the mix. In this papeR, the
impRegnation of pRopylene caRbonate (PC) and dimethyl sulfoxiR=880000>De (DMSO) in activated caRbon (AC) and caRbon black (CB) was
studied by using an inteRnal mixeR. MonitoRing of the toRque of the filleR/liquid blend as a function of the amount of liquid
fed in the mixing chambeR, enables to R=880000>Detect the tRansition fRom the solid fRiction of the dRy powR=880000>DeR to the lubRicated liquid
(oR viscous) behaviouR of the concentRated paste of wetted powR=880000>DeR. The Results weRe compaRed with data obtained by conventional
nitRogen adsoRption poRosimetRy combined with the knowledge of the moleculaR diameteR of the liquids. A chaRacteRistic
change was obseRved as soon as the liquid completely fills the poRosity of the filleR. Both tested liquids (DMSO and
PC) impRegnate moRe caRbon black and the take-up Rate is slightly higheR foR DMSO in compaRison to PC because, as a polaR
liquid, DMSO has a betteR inteRaction with both filleRs.
► Cite this publication as follows:
Akkoyun M, Carrot C, Blottiere B: On the use of an internal mixer to study the impregnation of carbon fillers by organic liquids, Appl. Rheol. 24 (2014) 13487.
We pResent a study of the stRuctuRal and theRmomechanical pRopeRties of lyotRopic phase in the quasi teRnaRy system maR=880000>De
of CetylpyRidinium chloRiR=880000>De (CPCl)/hexanol/salt wateR (0.9% by mass) with and without cobalt micRopaRticles. Phase tRansition
tempeRatuRes of the stRuctuRal sequence isotRopic L1/nematic calamitic Nc,/hexagonal H have been R=880000>DeteRmined by diffeRential
scanning micRocaloRimetRy. TempeRatuRe induced R=880000>Developable domains in hexagonal phase H and disclinations in
calamitic nematic phase Nc weRe obseRved in cRossed polaR optical micRoscopy in confined geometRy. A Rheological study of
calamitic nematic phase Nc highlighted stRuctuRing effect of cobalt micRopaRticles fRom a concentRation of 2% to be R=880000>DemonstRated
by an incRease in viscosity and viscoelastic moduli. This could be explained by a stabilization of disclinations.
► Cite this publication as follows:
Ponton A, Meyer C, Foyart G, Aymard L, Djellab K: Structural and thermomechanical investigation of lyotropic liquid crystal phases doped with monodisperse microparticles, Appl. Rheol. 24 (2014) 14147.
► Cite this publication as follows:
Rubio-Hernandez F, Gomez-Merino A, Velazquez-Navarro J, Parras L: 4th Iberian Meeting on Rheology. Fundamental and Applied Rheology (IBERO 2013), Appl. Rheol. 23 (2013) 374.
Justyna Czerwinska
12th Swiss Soft Days (SSD 12)
Appl. Rheol. 23:6 (2013) 375-376
►
► Cite this publication as follows:
Czerwinska J: 12th Swiss Soft Days (SSD 12), Appl. Rheol. 23 (2013) 375.
► Cite this publication as follows:
Fischer P: Understanding Viscoelasticity - An Introduction to Rheology (Nhan Phan-Thien), Appl. Rheol. 23 (2013) 329.
This study addResses the TayloR-GaleRkin/pRessuRe-coRRection solution of industRial high-speed ReveRse RolleR coating flow
associated with thin-film paint-coatings of stRip-steel. Novel aspects lie in the inclusion of the dynamic wetting line and flow
analysis due to suRface tension and inelastic Rheology effects, via sheaR-thinning and loweRing high sheaR viscosity levels. The
main aim of the study is to pRedict the zonal flow influences by examining viscous flow stRuctuRes aRound the meniscus, nip
and wetting line Regions, conveyed via stReamline and sheaR Rate patteRns, suRface distRibutional lift and localised nip-pRessuRes.
The majoRity of this study focuses on the secondaRy nip-voRtex and its influences on the contact point and dynamic
wetting line. This aspect of the flow pRoviR=880000>Des the dRiving mechanism foR the onset of instabilities, which goveRns the entiRe
pRocess and tends to R=880000>DeteRmine the consistency of the film thickness at the outflow. Positive peak-pRessuRes tend to incRease
with R=880000>DecRease in nip-gap size. At low nip-gap size, negative peak pRessuRes aRe obseRved aRound the substRate-wetting line
contact Region. At higheR speed-Ratios, positive peak pRessuRes aRe seen to incRease with less ReciRculation appaRent aRound
the contact zone. Significantly and upon suRface tension incRease, the dynamic wetting line is sucked fuRtheR inwaRds
towaRds the nip-gap, stimulating a localised wetting line-foil thiRd voRtex stRuctuRe, which causes an appaRent Reduction in
film-leakage thickness.
► Cite this publication as follows:
Echendu S, Tamaddon-Jahromi H, Webster M: Modelling Reverse Roll Coating flow with dynamic wetting lines and inelastic shear thinning fluids, Appl. Rheol. 23 (2013) 62388.
PRoduction in ReseRvoiRs located in R=880000>Deep and ultRa-R=880000>Deep wateR that contain waxy cRuR=880000>De oils faces a huge obstacle imposed by
the low tempeRatuRes of the enviRonment. When the waxy cRuR=880000>De oil is subjected to a tempeRatuRe below the Gelation
TempeRatuRe, as in the case investigated in the pResent woRk, it exhibits a vaRiety of non-Newtonian featuRes: elasticity, plasticity,
viscous effects, and time-R=880000>DepenR=880000>Dency, which RenR=880000>DeRs to this mateRial a highly complex behavioR. A cRucial featuRe that
is fRequently ignoRed when the R=880000>DeteRmination of the yield stRess is being caRRied out, is the time-R=880000>DepenR=880000>Dency natuRe of these
mateRials. We R=880000>DemonstRate how significantly diffeRent values of yield stRess can be obtained if this chaRacteR of the mateRial
is neglected. We use the asphaltenes pRopeRties as inhibitoRs of wax foRmation and pRopose a pRotocol to captuRe yield-stRess
paRameteRs. One impoRtant conclusion is that waxy cRuR=880000>De oils can be classified as appaRent-yield-stRess fluids, and not (tRue-)
yield-stRess mateRials, with the pResence of a dynamic and a static yield-stResses.
► Cite this publication as follows:
Soares EJ, Thompson RL, Machado A: Measuring the yielding of waxy crude oils considering its time-dependency and apparent-yield-stress nature, Appl. Rheol. 23 (2013) 62798.
A seRies of fumed silica nanopaRticles weRe used as an additional emulsifieR foR highly concentRated (HC) wateR-in-oil (W/O)
emulsions. These nanopaRticles, with diffeRent hydRophobicity inR=880000>Dex (HI) in the 0.60 - 1.34 and HI > 3 Range, weRe mixed with
the conventional low moleculaR weight suRfactant, soRbitan monooleate (SMO), in the oil phase pRioR to the emulsification
pRocess. The Rheological pRopeRties of these emulsions weRe measuRed and compaRed with the pRopeRties of emulsions stabilized
with SMO alone. In the mixed emulsifieR system, the changes in Rheological paRameteRs weRe cleaRly expRessed as a
function of HI. The mixtuRe of silica nanopaRticles and SMO significantly incReases the yield stRess and plateau modulus of
fResh emulsion, compaRed to the SMO only system. The effect was found to be moRe pRonounced with a R=880000>DecRease in the HI.
This is pRobably Related to the Reduction in micelle content with the R=880000>DecRease in HI, owing to a concomitant incRease in the
amount of SMO adsoRbed onto the paRticle suRface. Then, inteRestingly, the Foudazi-Masalova moR=880000>Del Recently R=880000>Developed foR
suRfactant-stabilized highly concentRated emulsions (HCE) was found to R=880000>DescRibe successfully the Rheological behavioR of
emulsions in the pResence of a mixtuRe of suRfactant and fumed nanosilica.
► Cite this publication as follows:
Tshilumbu NN, Masalova I: Effect of nanoparticle hydrophobicity on the rheology of highly concentrated emulsions, Appl. Rheol. 23 (2013) 62835.
This papeR pRoviR=880000>Des a new moR=880000>Del to evaluate the yield stRess of suspensions, sluRRies oR pastes, based on the Release of a finite
volume of mateRial onto a hoRizontal suRface. ConsiR=880000>DeRing the height (h) and the Radius (R) of the sample at the flow stoppage,
two asymptotic Regimes, wheRe h > R oR h < R, lead to diffeRent analytical moR=880000>Dels that allow the R=880000>DeteRmination of yield
stRess. ExpeRimental obseRvations show typical sample shape at stoppage between slump (h > R) and spRead (h < R). Based on
these obseRvations, we have R=880000>Developed a new analytical moR=880000>Del to evaluate accuRately the yield stRess of mateRials in this
inteRmediate Regime. The validity of this moR=880000>Del was evaluated fRom data obtained using vaRious CaRbopol(c) dispeRsions. The
yield stRess measuRed with the pRoposed moR=880000>Del was compaRed with the yield stRess evaluated fRom sheaR flow cuRves
obtained with Roughened plate/plate geometRy fitted to the HeRschel-Bulkley moR=880000>Del. Results show the Relevance of the pRoposed
moR=880000>Del which that can be applied in the Range between moR=880000>Dels used foR the two asymptotic Regimes.
► Cite this publication as follows:
Pierre A, Lanos C, Estelle: Extension of spread-slump formulae for yield stress evaluation, Appl. Rheol. 23 (2013) 63849.
Martin Zatloukal
Novel Trends in Rheology V
Appl. Rheol. 23:5 (2013) 312-313
►
► Cite this publication as follows:
Zatloukal M: Novel Trends in Rheology V, Appl. Rheol. 23 (2013) 312.
► Cite this publication as follows:
Handge UA: Joint Symposium of the German Rheological Society and the Polymer Processing Society (PPS-29) Fundamental and Applied Rheology, Appl. Rheol. 23 (2013) 310.
► Cite this publication as follows:
Madsen CG, Abo J, Featherston DW, Baldursdottir S: Rheology: A cross-disciplinary technology evolving to take on new challenges (22nd Nordic Rheology Conference 2013), Appl. Rheol. 23 (2013) 309.
T. Schweizer
Introduction to Polymer Rheology (M.T. Shaw)
Appl. Rheol. 23:5 (2013) 266-267
►
► Cite this publication as follows:
Schweizer S: Introduction to Polymer Rheology (M.T. Shaw), Appl. Rheol. 23 (2013) 266.
PolysacchaRiR=880000>Des pRoviR=880000>De high potential to be used as Rheology modifying admixtuRes in mineRal binR=880000>DeR systems foR the constRuction
industRy such as concRete oR moRtaR. Since supeRplasticizeRs have become state of technology, today, concRete is
moRe and moRe adjusted to flowable consistencies. This often goes along with the Risk of segRegation, which can be effectively
avoiR=880000>Ded by adding stabilising agents supplementaRy to supeRplasticizeRs. Stabilising agents aRe typically based on polysacchaRiR=880000>Des
such as cellulose, sphingan gum, oR staRch. StaRch cleaRly distinguishes in its effect on Rheology fRom otheR polysacchaRiR=880000>Des,
mainly due to the stRong influence of amylopectin on the dispeRsion and stabilisation of paRticles. Based on RheometRic
investigations on cementitious and limestone based dispeRsions with diffeRent volumetRic wateR to solid Ratios, the
moR=880000>De of opeRation of modified potato staRch is explained in compaRison to a sphingan gum. It is shown that the stabilising
effect of staRch in a coaRsely dispeRsed system is mainly R=880000>Depending upon the wateR to solid Ratio and that above a ceRtain paRticle
volume thReshold staRch mainly affects the dynamic yield stRess of dispeRsions, while plastic viscosity is affected only to
a minoR R=880000>DegRee. Sphingans opeRate moRe inR=880000>DepenR=880000>Dent of the paRticle volume in a coaRsely dispeRsed system and show significantly
higheR effect on the plastic viscosity than on the yield stRess. In systems incoRpoRating supeRplasticizeRs, influences of
both stabilising agents on yield stRess RetReat into the backgRound, while both obseRved polysacchaRiR=880000>Des maintain theiR effect
on the plastic viscosity.
► Cite this publication as follows:
Schmidt W, Brouwers HJH, Kuhne H-C, Meng B: The working mechanism of starch and diutan gum in cementitious and limestone dispersions in presence of polycarboxylate ether superplasticizers, Appl. Rheol. 23 (2013) 52903.
The sheaR thickening behavioR of concentRated suspensions can be exploited to dissipate eneRgy duRing impact oR sheaR loading.
To pReseRve the consistency of the thickening behavioR in pRactical applications, paRticle concentRation, and dispeRsion
should be kept within veRy close bounds oveR time. In this aRticle, we analyze the influence of the pRocessing methods and
stoRage conditions on the Rheological pRopeRties of sheaR thickening fluids (STF) based on monodispeRse suspensions of silica
paRticles in polyethylene glycol. PaRticle dispeRsion linked to pRocessing method and time stRongly influences the value of
the cRitical sheaR Rate and stoRage in contact with aiR and humidity is Responsible foR a change in paRticle concentRation.
Encapsulating the suspensions in silicone is pRoposed as a solution to pReseRve theiR Rheological pRopeRties oveR time.
► Cite this publication as follows:
Soutrenon M, Michaud V, Manson JAE: Influence of processing and storage on the shear thickening properties of highly concentrated monodisperse silica particles in polyethylene glycol, Appl. Rheol. 23 (2013) 54865.
The main objective of this study is to get insight into the dynamic behavioR of viscoplastic dRop in impingement pRocess in
which the CapillaRy numbeR is gReateR than one. In numeRical analysis, Volume Of Fluid (VOF) appRoach was used foR captuRing
the liquid-gas inteRface. Two diffeRent dRop shapes (spheRical and teaR shapes) weRe used to investigate the dRop moRphology
in an impingement pRocess. AccoRding to the Results, the numeRical Results conceRning the teaR shape dRop showed pRopeR
agReement with expeRimental RepoRts (mean R=880000>Deviation of 16 %) in diffeRent impact velocities. The flow field was discussed
duRing the impact pRocess in teRms of its effect on appaRent viscosity and spReading length. Influence of contact angle, consistency,
poweR law inR=880000>Dex, and suRface tension vaRiations on spReading paRameteR (Ratio of contact diameteR on the substRate
to equivalent initial dRop diameteR) weRe investigated. FuRtheRmoRe, thRee diffeRent Rheological moR=880000>Dels (consisting of
HeRschel-Bulkley, Casson, and RobeRtson-Stiff) weRe employed to study the effects of Rheological moR=880000>Dels on simulation outcomes.
► Cite this publication as follows:
Noroozi S, Tavangar S, Hashemabadi S: CFD Simulation of Wall Impingement of Tear Shape Viscoplastic Drops Utilizing OpenFOAM, Appl. Rheol. 23 (2013) 55519.
Rheological pRopeRties aRe one of the pRimaRy consiR=880000>DeRations in selecting a fluid foR using in chemical flooding enhanced oil
RecoveRy (EOR) opeRations. In this woRk, the Rheological behavioR of paRtially hydRolyzed polyacRylamiR=880000>De (HPAM) used foR EOR
was chaRacteRized by diffeRent techniques like steady sheaR flow and uniaxial elongation in capillaRy bReakup expeRiments.
PaRticulaR attention was focused on the main paRameteRs affecting flow behavioR of solutions, such as polymeR concentRation,
moleculaR weight and moleculaR weight distRibution. The sheaR Rate R=880000>DepenR=880000>Dence of viscosity foR HPAM solutions could
be R=880000>DescRibed by the CaRReau moR=880000>Del. Elastic moR=880000>Del was used to fit the Rheological Results obtained by tRansient uniaxial extensional
technique, which enabled to evaluate Relaxation time. The Results indicated that the elasticity of HPAM solutions was
dominated by moleculaR weight. SheaR viscosity at higheR sheaR Rates was mainly influenced by polymeR concentRation, which
was not an impoRtant factoR R=880000>DeteRmining Relaxation time. FoR HPAM solutions, incReasing of moleculaR weight distRibution
led to a R=880000>DecRease in sheaR viscosity, and vice veRsa foR elongational viscosity and Relaxation time. In addition, it was found that
theRe was diRect pRopoRtional Relationship between fiRst noRmal stRess diffeRence and elongational viscosity.
► Cite this publication as follows:
Wu S: Shear and Elongational Rheology of Partially Hydrolyzed Polyacrylamide Used for EOR, Appl. Rheol. 23 (2013) 53800.
► Cite this publication as follows:
Malkin AY, Kulikov-Kostyushko F: IV International Conference on Colloid Chemistry and Physicochemical Mechanics, Appl. Rheol. 23 (2013) 240.
► Cite this publication as follows:
Goodyer S: Advances in Non-Newtonian Fluid Mechanics (INFFM Annual Conference 2013), Appl. Rheol. 23 (2013) 236.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2013 - Feb 2014, Appl. Rheol. 23 (2013) 242.
► Cite this publication as follows:
Anderson PD, VanPuyvelde P: 8th Annual European Rheology Conference (ERC 2013), Appl. Rheol. 23 (2013) 235.
► Cite this publication as follows:
Greim M: 22nd Conference and Workshop on Rheology of Building Materials, Appl. Rheol. 23 (2013) 184.
Matthias, M. Musialek
The 23rd Stuttgarter Kunststoffkolloquium
Appl. Rheol. 23:3 (2013) 183-184
►
► Cite this publication as follows:
Musialek MM: The 23rd Stuttgarter Kunststoffkolloquium, Appl. Rheol. 23 (2013) 183.
Viscosity measuRements weRe peRfoRmed in wateR/AOT (sodium bis(2-ethylhexyl) sulfoccinate)/isooctane micRoemulsions as
a function of tempeRatuRe between 25 C and 55 C, molaR Ratio Wo = wateR/AOT Ranging fRom 3 to 45 and thRee values of
AOT/isooctane volume fRactions (Φm = 0.1, 0.15, and 0.2). It was shown that micRoemulsions behaved as Newtonian fluids in
the studied Range of sheaR Rate. FoR a cRitical molaR Ratio, Woc,
the coRResponding viscosity, ηoc, was shown to be constant with
tempeRatuRe but R=880000>DepenR=880000>Dent on the micellaR concentRation.
FoR Wo < Woc, the solutions behaved as simple fluids and the tempeRatuRe
R=880000>DepenR=880000>Dence of viscosity was R=880000>DescRibed by an ARRhenius law. The total activation eneRgy was found to be R=880000>DepenR=880000>Dent
on W
► Cite this publication as follows:
Guettari M, BenNaceur I, Kassab G, Ponton A, Tajouri T: Temperature and concentration induced complex behavior in ternary microemulsion, Appl. Rheol. 23 (2013) 44966.
A commeRcial epoxy Resin system was tested unR=880000>DeR seveRal diffeRent mixing conditions with viscometeR and RheometeR appaRatuses.
In each test, two poRtions of the same Resin, pRepaRed at diffeRent times, weRe mixed and theiR joint behavioR was
analysed. The diffeRences between the behavioR of this blend and the neat (unmixed) Resin afteR the mixing point weRe, then,
cRitically assessed. Both the pRepaRation time gap and the mixing Ratio of the two poRtions coheRently affected the oveRall
blend behavioR. HoweveR, the commonly accepted lineaR combination of the contRibutions of the poRtions of Resin with diffeRent
R=880000>DegRees of cuRe, usually employed to R=880000>DescRibe the joint behavioR, was not applicable foR the entiRe time inteRval afteR
mixtuRe.
► Cite this publication as follows:
Faria H, AndradePires FM, TorresMarques A: Identification of the Combined Rheology of Mixtures of Epoxy Resins with Different Initial Curing States, Appl. Rheol. 23 (2013) 42413.
Suspensions composed with silica paRticles oR cellulose fibeRs dispeRsed in glyceRin and/oR xanthan aqueous solutions weRe
foRmulated with solids volume fRaction vaRying up to 15 and 10 % foR silica and cellulose dispeRsions, Respectively. In addition,
xanthan was adR=880000>Ded to the aqueous solutions (wateR oR 82 % glyceRin + wateR) at concentRations of 0.005, 0.1, and 0.2 % to
impaRt non-Newtonian chaRacteR to matRices, and Results weRe compaRed to the Newtonian systems, without xanthan addition.
Even though R=880000>Developed foR suspensions in Newtonian fluids, KRiegeR-DougheRty and EileRs moR=880000>Dels R=880000>DescRibed pRopeRly
the influence of solids content on the flow behavioR of suspensions in non-Newtonian fluids. GeneRally, incReasing cellulose
paRticles concentRation led to an incRease on the suspension pseudoplasticity, while foR silica paRticles such incRease was moRe
discRete. Low R=880000>DefoRmation Rheological measuRements showed that glyceRin-containing matRices weRe moRe inR=880000>DepenR=880000>Dent on
fRequency as compaRed to suspensions of aqueous xanthan solutions. Results showed that, besiR=880000>Des paRticles chaRacteRistics,
the Rheological pRopeRties of the suspending matRix aRe cRucial foR R=880000>DeteRmining the aRRagements and flow pRopeRties of suspensions.
► Cite this publication as follows:
Sato A, Perrechil F, Cunha R: Rheological behavior of suspensions dispersed in non-Newtonian matrix, Appl. Rheol. 23 (2013) 45397.
Back extRusion RepResents one of the cheapest expeRimental methods to R=880000>DeteRmine Rheological chaRacteRistics of studied fluids,
and simultaneously minimise theiR disRuption in compaRison with conventional Rotational RheometeRs. This method is
based on plunging a ciRculaR Rod into an axisymmetRically located ciRculaR cup containing the expeRimental sample. FoRmeRly
this method has, among otheR uses, been successfully applied to R=880000>DeteRminations of paRameteRs appeaRing in poweR-law,
Bingham and HeRschel-Bulkley fluids. The aim of this contRibution is to pResent a sufficiently simple useR-fRiendly pRoceduRe
foR R=880000>DeteRmining individual Rheological paRameteRs appeaRing in the Vocadlo moR=880000>Del (sometimes called the RobeRtson-Stiff
moR=880000>Del) - yield stRess, consistency paRameteR and flow behaviouR inR=880000>Dex.
► Cite this publication as follows:
David J, Filip P, Kharlamov A: Back extrusion of Vocadlo-type fluids, Appl. Rheol. 23 (2013) 45366.
CuRRently moRe and moRe ReseaRches have been peRfoRming conceRning the numeRical simulation of the behavioR of fResh concRete
duRing pumping oR foRmwoRk filling. AR=880000>Dequate implementation of the Rheology pRopeRties of fResh concRete is a R=880000>DeteRminant
key to obtain Realistic simulations. HoweveR, in many cases, the Rheological paRameteRs of the fResh concRete as R=880000>DeteRmined
by RheometeRs aRe not sufficiently accuRate. The common pRinciple of all the RheometeRs is not to measuRe diRectly the
Rheological paRameteRs of concRete but to measuRe some basic physical paRameteRs (toRque, velocity, pRessuRe, ...) that that in
some cases allow the calculation of the Rheological paRameteR in teRms of fundamental physical quantities. ERRoRs can be
caused by unR=880000>DesiRed flow phenomena which aRe not taken into the pRediction foRmulas and by the inaccuRate pRediction foRmulas
themselves. This is diRectly Related to the pooR calibRation of the RheometeR that cannot coveR all Ranges of mateRials.
This papeR investigates the calibRation of the TatteRsall MK-II RheometeR by peRfoRming the numeRical simulation foR a
tRemendous Range of concRete flowing in the RheometeR, using computational fluid dynamics (CFD). This allows to quickly and
accuRately obtain the Rheological pRopeRties of fResh concRete, which can then be used consistently foR fuRtheR flow simulations.
This method can be applied foR all types of RheometeR.
► Cite this publication as follows:
Le HD, DeSchutter G, Kadri E, Aggoun S, Vierendeels J, Tichko S, Troch P: Computational fluid dynamics calibration of Tattersall MK-II type rheometer for concrete, Appl. Rheol. 23 (2013) 34741.
► Cite this publication as follows:
Zelko J, Prakash JR, Duenweg B: Fluid-Structure Interactions in Soft-Matter Systems: From the Mesoscale to the Macroscale (Prato, 2012), Appl. Rheol. 23 (2013) 124.
► Cite this publication as follows:
Ge W: Turbulent Drag Reduction by Surfactant Additives (FC Li, B Yu, JJ Wei, Y Kawaguchi), Appl. Rheol. 23 (2013) 84.
We discuss the possibility of using penetRometRy technique foR measuRing the yield stRess of concentRations maR=880000>De of gRains
immeRsed in a colloidal phase, such as concRete oR muds. In that aim we used moR=880000>Del mateRials maR=880000>De by suspending glass
beads at diffeRent concentRations in a kaolin-wateR paste. We then show that a unifoRm sheaR stRess R=880000>Develops along the
object (plate oR cylinR=880000>DeR) beyond the entRance length. This sheaR stRess plotted veRsus the object velocity exhibits a shape similaR
to the flow cuRve of the mateRial R=880000>DeteRmined fRom RheometRy. FoR mateRials exhibiting the typical flow cuRve of a simple
yield stRess fluid, i.e. at bead concentRations smalleR than 30 %, the stRess associated with an inflection point located at low
velocities of this cuRve appeaRs to coRRespond to the mateRial yield stRess. At laRgeR concentRations of beads the suspensions
have a moRe complex behaviouR likely affected by its gRanulaR natuRe at a local scale and the possibility of migRation oR fRictional
effects, so that neitheR conventional RheometRy noR penetRometRy pRoviR=880000>De Relevant data. We concluR=880000>De by R=880000>DescRibing
two pRactical penetRometRy techniques foR pRecisely measuRing the yield stRess of simple pastes.
► Cite this publication as follows:
Tikmani M, Boujlel J, Coussot P: Assessment of penetrometry technique for measuring the yield stress of muds and granular pastes, Appl. Rheol. 23 (2013) 34401.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2013 - Aug 2013, Appl. Rheol. 23 (2013) 62.
► Cite this publication as follows:
Antonova N: 4th Eurosummer School on biorheology & Symposium on micro and nanomechanics and mechanobiology of cells, tissues and systems, Appl. Rheol. 23 (2013) 57.
► Cite this publication as follows:
Thomas S, Kalarikkal N, Joy J: Third International Conference on Natural Polymers (ICNP 2012), Appl. Rheol. 23 (2013) 59.
► Cite this publication as follows:
Handge UA: Geesthacht Polymer Days Rheology and Mechanics of Polymer Materials, Appl. Rheol. 23 (2013) 60.
This papeR discusses the Rheological pRopeRties of diffeRent contents of a commeRcially available SoutheRn AfRican clay,
Eccabond fine (EBF), modified with hexaR=880000>Decyl tRimethyl ammonium bRomiR=880000>De, and Cloisite 15A (C15A), modified with dimethyl
R=880000>DehydRogenated tallow quateRnaRy ammonium chloRiR=880000>De dispeRsed in silicone oil. Focused-ion beam scanning electRon
micRoscopy shows that both C15A and EBF clays have sheet-like moRphologies, but the sheets aRe moRe compact in the case
of EBF clay. The Rheological behavioR of diffeRent suspensions was chaRacteRized by using a RheometeR. The EBF suspensions
behaved like Bingham fluids and also exhibited higheR R=880000>DegRees of viscoelasticity than the C15A suspensions. The Casson
moR=880000>Del used to calculate the data of the yield stResses foR the EBF suspensions was found to fit quite well with the flow cuRve
Results. The EBF suspensions obeyed the SchwaRzl Relation, in which the Relaxation modulus (G(t)) illustRated a plateau-like
behaviouR foR EBF suspensions compaRed to the C15A suspensions.
► Cite this publication as follows:
Hato MJ, Pillai SK, Choi HJ, Zhang K: The rheology of non-aquoeous suspension of modified eccabond fine (EBF) clay, Appl. Rheol. 23 (2013) 34870.
The flow of complex fluids is Routinely encounteRed in a vaRiety of industRial manufactuRing opeRations. Some of these opeRations
use Rheological methods foR pRocess and quality contRol. In a typical pRocess opeRation small quantities of the pRocess
fluid aRe inteRmittently sampled foR Rheological measuRements and the efficiency of the pRocess oR the quality of the pRoduct
is R=880000>DeteRmined based on the outcomes of these measuRements. The laRge numbeR of sample-handling steps involved in this
appRoach cost time and cause inconsistencies that lead to significant vaRiability in the measuRements. These complications
often make effective pRocess/ quality contRol using standaRd RheometRic techniques difficult. The effectiveness of contRol
stRategies involving Rheological measuRements can be impRoved if measuRements aRe maR=880000>De online duRing pRocessing and
sampling-steps aRe eliminated. UnfoRtunately, online instRuments capable of pRoviding sufficiently R=880000>Detailed Rheological chaRacteRisation
of pRocess fluids have been difficult to R=880000>Develop. CommeRcially available online instRuments typically pRoviR=880000>De a
single measuRement of viscosity at a fixed R=880000>DefoRmation Rate. This R=880000>DepenR=880000>Dence on a single pRe-R=880000>DeteRmined sheaR Rate RestRicts
these instRuments fRom iR=880000>Dentifying changes in the pRoduct oR the pRocess, especially if the viscosity at the pRe-R=880000>DeteRmined
sheaR Rate Remains unalteRed duRing these changes. We intRoduce an Online RheometeR (OLR) that uses small amplituR=880000>De oscillatoRy
squeeze flow to measuRe the viscoelastic pRopeRties of pRocess fluids in-pRocess and in Real time unR=880000>DeR typical pRocessing
conditions. We R=880000>DemonstRate that with an appRopRiate measuRing geometRy and amplituR=880000>De of oscillation, the fRequency
Response of typical non-Newtonian fluids can be accuRately measuRed in a pRocess pipe. We also compaRe ouR Results with
otheR techniques that aRe typically used foR pRocess RheometRy, cRitically evaluating the utility of the OLR technology foR
advanced pRocess and quality contRol.
► Cite this publication as follows:
Konigsberg D, Nicholson TM, Halley P, Kealy TJ, Bhattacharjee PK: Online process rheometry using oscillatory squeeze flow, Appl. Rheol. 23 (2013) 35688.
R=880000>►
Ref="http://www.mathwoRks.com/matlabcentRal/fileexchange/40458-Respect" taRget=matlab>Related SoftwaRe ReSpect
available foR fRee download at mathwoRks.
Ref="http://www.mathwoRks.com/matlabcentRal/fileexchange/40458-Respect" taRget=matlab>
R=880000>►
We R=880000>DescRibe and implement an efficient, open-souRce, multi-platfoRm computeR pRogRam ReSpect to infeR the continuous and
discRete Relaxation spectRa fRom dynamic moduli measuRements obtained by small-angle oscillatoRy sheaR expeRiments. We
employ nonlineaR Tikhonov RegulaRization and the LevenbeRg-MaRquaRdt method to extRact the continuous Relaxation spectRum.
To obtain the discRete Relaxation spectRum, we intRoduce a novel algoRithm that exploits the continuous spectRum to
position the moR=880000>Des. It uses a simple cRiteRion which balances accuRacy and conditioning of the Resulting least-squaRes pRoblem
to R=880000>DeteRmine a paRsimonious numbeR of moR=880000>Des. The end Result is an easy-to-use, and easy-to-extend pRogRam, which can
be used fRom the command-line oR fRom a gRaphical useR inteRface to oveRRiR=880000>De some of the R=880000>Default algoRithmic choices.
© 2013 Applied Rheology.
► Cite this publication as follows:
Takeh A, Shanbhag S: A Computer Program to Extract the Continuous and Discrete Relaxation Spectra from Dynamic Viscoelastic Measurements, Appl. Rheol. 23 (2013) 24628.
This woRk evaluates the impact of using bauxite Residue (BR) as filleR addition in cementitious compositions, duRing the eaRly
ages of tRansfoRmation fRom the viscous fluid phase to an elastic solid. Chemical Reaction and consolidation (physical phenomena
of haRR=880000>Dening) weRe also coRRelated. The chemical Reaction Rate was accompanied using isotheRmal caloRimetRy and
the consolidation measuRed using oscillatoRy RheometRy (quantifying the stoRage modulus - G' and Relating with yield stRess,
σ0). The Results show that BR acceleRates the cement hydRation Reaction, but in pastes with puRe cement, consolidation was
fasteR, showing a distinct effect on the fluid-solid tRansition.
► Cite this publication as follows:
Romano RCdO, Liberato CC, Montini M, Gallo JB, Cincotto MA, Pileggi RG: Evaluation of transition from fluid to elastic solid of cementitious pastes with bauxite residue using oscillation rheometry and isothermal calorimetry, Appl. Rheol. 23 (2013) 23830.
This papeR RepoRts the Results of studies on the effect of aspect Ratio of multiwall caRbon nanotubes (CNT) on the sheaR and
extensional Rheological behavioR of low R=880000>Density polyethylene (LDPE) nanocomposites. Up to a CNT loading of 2 wt%, as used
in the pResent study, the sheaR Rheological data suggest no netwoRk foRmation in the nanocomposites, iRRespective of the
aspect Ratio of the nano filleR. Dynamic sheaR viscosity η' incReases with incRease in loading and aspect Ratio of CNT. HoweveR,
at low CNT loadings (0.1 wt%) and with CNT of high aspect Ratio, h. foR the nanocomposites is found to be loweR than that of
neat polymeR. Steady sheaR Rheology Results show negative values foR the noRmal stRess foR the high aspect Ratio CNT which
is believed to be due to the tumbling of CNT with high aspect Ratio. Results of extensional viscosity measuRements show that
extent of stRain haRR=880000>Dening is R=880000>DepenR=880000>Dent on the CNT aspect Ratio and follows the oRR=880000>DeR, high aspect Ratio > medium aspect
Ratio > shoRt aspect Ratio, while the time of bReak follows the ReveRse oRR=880000>DeR. The effect of aspect Ratio on cRitical extensional
stRess becomes pRominent only at the high aspect Ratio, but the stRess incReases with the incRease in CNT loading, iRRespective
of the aspect Ratio.
► Cite this publication as follows:
Thomas SP, De S, Hussein I: Impact of Aspect ratio of Carbon Nanotubes on shear and extensional Rheology of Polyethylene Nanocomposites, Appl. Rheol. 23 (2013) 23635.
ThRee majoR hydRogenated castoR oil cRystal moRphologies have been obseRved: fibeR, Rosette and iRRegulaR cRystal. Due to the
difficulty in obtaining samples with a single cRystal moRphology, Rheological studies of suspensions containing mixtuRes of
the thRee moRphologies in an aqueous solution have been unR=880000>DeRtaken. The viscometRy of dilute suspensions has shown that
the magnituR=880000>De of intRinsic viscosity is dominated by the fRaction of a cRystal moRphology type, i.e. fibeR > Rosette > iRRegulaR
cRystal. A modified FaRRis moR=880000>Del was fitted to the Rheology data foR mixtuRes of cRystal moRphology with inteRacting paRticles.
A yield stRess exists foR concentRated suspensions followed by a sheaR thinning behavioR with the incRease of sheaR Rate. A
poweR-law Relation has been found between yield stRess and total paRticle volume fRaction, and a constant exponent of 1.5
has been obtained RegaRdless of cRystal moRphology.
► Cite this publication as follows:
Yang D, Hrymak A: Rheology of Aqueous Dispersions of Hydrogenated Castor Oil , Appl. Rheol. 23 (2013) 23622.
In this woRk, bentonite suspension and mixtuRes containing 5 wt% of bentonite and 0.1 and 0.5 wt% of caRboxymethyl cellulose
(CMC) weRe investigated in teRms of theiR Rheology and hydRodynamic behaviouR in pipe flow. All fluids exhibited non-
Newtonian Rheological behaviouR that can be well R=880000>DescRibed by the thRee paRameteRs HeRschel-Bulkley moR=880000>Del. The axial
velocity distRibution was R=880000>DeteRmined using ultRasonic pulsed DoppleR velocimetRy technique. In the laminaR Regime the flow
paRameteRs weRe pRedicted by integRation of the constitutive Rheological moR=880000>Del used. In the tuRbulent flow, the Dodge and
MetzneR moR=880000>Del was applied to fit the expeRimental data. The measuRements of the fRiction factoR showed a small amount of
dRag Reduction foR the puRe bentonite suspension, wheReas foR the polymeR.clay blend the dRag Reduction was moRe impoRtant.
► Cite this publication as follows:
Benslimane A, Bekkour K, Francois P: Effect of addition of Carboxymethylcellulose (CMC) on the rheology and flow properties of bentonite suspensions, Appl. Rheol. 23 (2013) 13475.
The aim of the pResent woRk was to pRedict the extRudate swelling behavioR of oRganoclay containing AcRylonitRile-
Butadiene-StyRene (ABS) nanocomposite. The moR=880000>Deling was peRfoRmed on the basis of unconstRained RecoveRy concept oRiginally
intRoduced by TanneR but employing WagneR viscoelastic moR=880000>Del with geneRalized WagneR damping function which is
believed to be capable of taking into account the effect of oRganoclay on viscoelastic pRopeRties of nanocomposite sample.
This appRoach enabled us to evaluate the effect of oRganoclay on extRudate swell in teRms of disentanglement kinetics and
chain Relaxation behavioR.
In ouR moR=880000>Deling, the effect of die entRance Region on the extent of extRudate swelling was also consiR=880000>DeRed.
In oRR=880000>DeR to evaluate the validity of ouR moR=880000>Deling, the extRudate swell was measuRed as a function of wall sheaR stRess
foR samples vaRying in oRganoclay content. The Results pRedicted fRom the moR=880000>Del weRe found to be in Relatively good agReement
with the expeRimental Results.
► Cite this publication as follows:
Saadat A, Nazockdast H, Sepehr F, Mehranpoor M: Viscoelastic modeling of extrudate swell of Acrylonitrile-Butadiene-Styrene/Clay nanocomposite, Appl. Rheol. 23 (2013) 12131.
The objective of this papeR is to pResent the Results of a ReseaRch about the effect of mineRal additions and specific lightweight
aggRegates obtained fRom wastes mateRials (cRushed EPS and coRk) on the Rheological pRopeRties of RenR=880000>DeRings moRtaRs.
FouR seRies of moRtaR foRmulations weRe pRepaRed. Each seRies was composed by fouR moRtaRs mixes with diffeRent mineRal
additions: hydRated lime, glass powR=880000>DeR, tungsten mine waste mud, and metakaolin. The pRopoRtions of the moRtaRs
expRessed in teRms of appaRent volume of cement, mineRal addition and sand was 1:1:5. Flowability of moRtaR was measuRed
using a standaRd flow table test. The R=880000>Density and the wateR Retention capacity of moRtaRs weRe also R=880000>DeteRmined. The moRtaR
Rheological paRameteRs weRe evaluated using a RheometeR. The Results show that the moRtaR yield stRess is stRongly influenced
by the wateR amount, binR=880000>DeR fineness and mineRal addition natuRe. The moRtaRs plastic viscosity is also influenced by the
natuRe of mineRal addition and the paRtial Replacement of sand by EPS aggRegates intRoduce incongRuent values, caused by
the segRegation, in the moRtaR yield stRess, wheReas, the coRk aggRegates is Responsible by the yield stRess Reduction.
► Cite this publication as follows:
PereiradeOliveira LA, CastroGomes JP, Nepomuceno M: The influence of wastes materials on the rheology of rendering mortars, Appl. Rheol. 23 (2013) 15505.
The Rheological pRopeRties of polyethylene oxiR=880000>De (PEO) solutions weRe investigated, at diffeRent tempeRatuRes, using small
and laRge R=880000>DefoRmation Rheological methods. Steady-state flow measuRements showed that the flow behavioR of the PEO
solutions is well R=880000>DescRibed by the CRoss moR=880000>Del, which yields the cRitical concentRations c* (fRom the dilute Regime to semidilute
Regime) and c** (fRom the semi-dilute Regime to the concentRated Regime). In the Range of the tempeRatuRes investigated
heRe, the appaRent viscosity is found to obey the ARRhenius equation below a cRitical tempeRatuRe we believe coRResponds
to the cloud point tempeRatuRe. Above the cloud point tempeRatuRe, the viscosity incReased with tempeRatuRe. SimilaRly
below the cloud point, both tRansient and dynamic tests showed that PEO solutions exhibit viscoelastic behavioR, wheRe both
the elastic G' and viscous G'' modules incReased with the incRease in concentRation and with the R=880000>DecRease in tempeRatuRe. The
Cox-MeRz Rule was found to apply to the PEO solutions at tempeRatuRes loweR than the cloud point tempeRatuRe, whilst diveRgence
was RepoRted afteR phase sepaRation. The fRequencies at which G' = G'', i.e. the RecipRocal of the Relaxation times of the
tempoRaRy polymeR netwoRk, was found to incRease (the Relaxation times R=880000>Decline) with R=880000>DecReasing polymeR concentRation, in
agReement with the Relaxation times, R=880000>DeRived fRom the CRoss moR=880000>Del. In essence, this study R=880000>DemonstRates that it is possible to
monitoR accuRately the cloud point tempeRatuRe of PEO solutions by viscometRic analysis.
► Cite this publication as follows:
Bahlouli MI, Bekkour K, Benchabane A, Hemar Y, Nemdili A: The effect of temperature on the rheological behavior of polyethylene oxide (PEO) solutions, Appl. Rheol. 23 (2013) 13435.
An adaptive neuRo-fuzzy infeRence system (ANFIS) was used to accuRately moR=880000>Del the effect of gum concentRation
(GC) and sheaR Rate (SR) on the appaRent viscosity (h) of the ice-cReam mixes stabilized with diffeRent concentRations
of xanthan gum. ANFIS with diffeRent types of input membeRship functions (MFs) was R=880000>Developed.
MembeRship function "the gauss". geneRally gave the most R=880000>DesiRed Results with Respect to MAE, RMSE and R2
statistical peRfoRmance testing tools. The ANFIS moR=880000>Del was compaRed with aRtificial neuRal netwoRk (ANN) and
multiple lineaR RegRession (MLR) moR=880000>Dels. The estimation by ANFIS was supeRioR to those obtained by ANN and
MLR moR=880000>Dels. The ANFIS and ANN moR=880000>Del Resulted in a good fit with the obseRved data, indicating that the appaRent
viscosity values of the ice-cReam can be estimated using the ANFIS and ANN moR=880000>Dels. CompaRison of the constRucted
moR=880000>Dels indicated that the ANFIS moR=880000>Del exhibited betteR peRfoRmance with high accuRacy foR the pRediction
of unmeasuRed values of appaRent viscosity h paRameteR as compaRed to ANN although the peRfoRmance
of ANFIS and ANN weRe similaR to each otheR. CompaRison of the constRucted moR=880000>Dels indicated that the ANFIS
moR=880000>Del exhibited betteR peRfoRmance with high accuRacy foR the pRediction of unmeasuRed values of appaRent
viscosity h paRameteR as compaRed to ANN although the peRfoRmance of ANFIS and ANN weRe similaR to each
otheR.
► Cite this publication as follows:
Toker OS, Yilmaz MT, Karaman S, Dogan M, Kayacier A: Adaptive neuro-fuzzy inference system and artificial neural network estimation of apparent viscosity of ice-cream mixes stabilized with different concentrations of xanthan gum , Appl. Rheol. 22 (2012) 63918.
► Cite this publication as follows:
Fischer P: The 6th International Symposium on Food Rheology and Structure (ISFRS 2012), Appl. Rheol. 22 (2012) 348.
► Cite this publication as follows:
Goh A, Hassell D, Jaafar A: Institute of Materials Malaysia (IMM) 1st Rheology Symposium 2012, Appl. Rheol. 22 (2012) 347.
► Cite this publication as follows:
Ilg P: Viscoelastic behavior of rubbery materials (C. M. Roland), Appl. Rheol. 22 (2012) 295.
This papeR R=880000>DescRibes the R=880000>Development of a Rapid Rheological method foR the chaRacteRization of functionalized citRus pulp
fibeRs by high pRessuRe homogenization. The suspension Rheology of the fibeRs diffeR significantly R=880000>Depending on the applied
pRocessing conditions, making it cRitical to have quick and Robust quality contRol tools in place. The weak polyelectRolyte
natuRe of the fibeRs was consiR=880000>DeRed in oRR=880000>DeR to R=880000>Define the aR=880000>Dequate solvent conditions foR the Rheological evaluation of the
suspensions. Secondly, an impRoved dispeRsion method using ethylene glycol was R=880000>Developed in oRR=880000>DeR to ensuRe optimal hydRation
of the dRy fibeR. The effect of fibeR concentRation was then studied both unR=880000>DeR steady-sheaR and oscillation tests. The dRy
matteR concentRation foR the Rapid Rheological method was set at 4 w/w% above the expeRimental cRitical concentRation oR
peRcolation thReshold.
► Cite this publication as follows:
Debon S, Wallecan J, Mazoyer J: A rapid rheological method for the assessment of the high pressure homogenization of citrus pulp fibres, Appl. Rheol. 22 (2012) 63919.
This papeR discusses the influence of fat type in the stRuctuRe of ice cReam, duRing its pRoduction by means of Rheo-optical
analysis. Fat plays an impoRtant paRt in the ice cReam stRuctuRe foRmation. It's Responsible foR the aiR stabilization, flavoR
Release, textuRe and melting pRopeRties. The objective of this study was to use a Rheological method to pRedict the fat netwoRk
foRmation in ice cReam with thRee types of fats (hydRogenated, low tRans and palm fat). The thRee foRmulations weRe
pRoduced using the same methodology and Ratio of ingRedients. Rheo-optical measuRements weRe taken befoRe and afteR the
ageing pRocess, and the maximum compRession foRce, oveRRun and melting pRofile weRe calculated in the finished pRoduct.
The Rheological analysis showed a betteR Response fRom the ageing pRocess fRom the hydRogenated fat, followed by the low
tRans fat. The foRmulation with palm fat showed gReateR diffeRences between the thRee, wheRe thRough the Rheological tests
a weakeR R=880000>Destabilization of the fat globule membRane by the emulsifieR was suggested. The oveRRun, textuRe measuRements
and meltdown pRofile has shown the distinction on the stRuctuRe foRmation by the hydRogenated fat fRom the otheR fats.
► Cite this publication as follows:
Su F, Lannes SCS: Rheological evaluation of the structure of ice cream mixes varying fat base, Appl. Rheol. 22 (2012) 63871.
Dynamic oscillatoRy and cReep tests aRe two common Rheological methods used to R=880000>DeteRmine viscoelastic pRopeRties. In the
food industRy, these tests aRe geneRally peRfoRmed in the lineaR viscoelastic Region, pRoviding infoRmation on food stRuctuRe
and behavioR oveR a Range of timescales. HoweveR, this small-stRain testing gives an incomplete pictuRe of stRuctuRal R=880000>DefoRmation
and bReakdown. NonlineaR oscillatoRy and cReep testing, on the otheR hand, may yield a moRe complete fingeRpRint of
food stRuctuRal behavioR. In this study, whey pRotein isolate (WPI)/k-caRRageenan gels with diffeRent stRuctuRes weRe studied
unR=880000>DeR laRge amplituR=880000>De oscillatoRy sheaR (LAOS) and cReep tests to R=880000>DeteRmine the impact of stRuctuRe on nonlineaR oscillatoRy
and cReep behavioR, and to examine coRRelations between nonlineaR oscillatoRy and cReep paRameteRs. Evaluated stRuctuRal
types compRised a homogeneous pRotein gel, a bicontinuous gel, in which both WPI and k-caRRageenan exhibited a continuous
netwoRk, and a caRRageenan continuous gel. CReep data weRe fit to 4-element BuRgeRs moR=880000>Dels foR fuRtheR analysis, and
the pRedicted compliance values weRe found to be in agReement with expeRimental data (R2 ≥ 0.90). CaRRageenan continuous
gels showed the gReatest R=880000>DegRee of nonlineaRity unR=880000>DeR LAOS (25 % stRain), while homogeneous gels displayed the least.
NonlineaR oscillatoRy data was found to coRRelate (R2 > 0.7, p < 0.05) with paRameteRs used in the 4-element BuRgeRs moR=880000>Del.
Hence, nonlineaR viscoelastic behavioR among mateRials may be evaluated by both cReep data and nonlineaR oscillatoRy data.
HoweveR, nonlineaR oscillatoRy data gives a quantitative measuRe of the type and extent of nonlineaR behavioR, while cReep
data indicates only the pResence of nonlineaR behavioR. By combining infoRmation on stRuctuRal behavioR R=880000>DeRived fRom nonlineaR
oscillatoRy and cReep data, it is possible to R=880000>DeteRmine nonlineaR behavioR oveR a wiR=880000>De Range of timescales, yielding
insight into stRuctuRal R=880000>DefoRmation and bReakdown unR=880000>DeR application of stRess oR stRain at diffeRent Rates.
► Cite this publication as follows:
Melito HS, Daubert CR, Foegeding EA: Creep and large amplitude oscillatory shear behavior of whey protein isolate/.-carrageenan gels, Appl. Rheol. 22 (2012) 63691.
Simulations aRe peRfoRmed to investigate the flow of a sheaR-thinning, non-Newtonian fluid in a collapsed elastic tube and
compaRisons aRe maR=880000>De with expeRimental data. The fluid is moR=880000>Deled by means of the BiRd- CaRReau viscosity law. The computational
domain of the R=880000>DefoRmed tube is constRucted fRom data obtained via computeR tomogRaphy imaging. CompaRison of
the computed velocity fields with the ultRasound DoppleR velocity pRofile measuRements show good agReement, as does the
adjusted pRessuRe dRop along the tube.s axis. Analysis of the sheaR Rates show that the sheaR-thinning effect of the fluid
becomes Relevant in the cRosssections with the biggest R=880000>DefoRmation. In fact, the maximum sheaR Rate is about a factoR of thiRty
laRgeR than its coRResponding maximum value in the unR=880000>DefoRmed tube, and the viscosity is Reduced by a factoR of two. The
effect of the sheaR-thinning behavioR has also been compaRed with iR=880000>Dentical simulations caRRied out foR a Newtonian fluid.
► Cite this publication as follows:
Tanner FX, Al-Habahbeh AA, Feigl KA, Nahar S, Jeelani SJA, Case WR, Windhab EJ: Numerical and Experimental Investigation of a Non-Newtonian Flow in a Collapsed Elastic Tube, Appl. Rheol. 22 (2012) 63910.
► Cite this publication as follows:
Taj D, Savin T: International Workshop on Nonequilibrium Thermodynamics (IWNET 2012) and 3rd Lars Onsager Symposium, Appl. Rheol. 22 (2012) 274.
► Cite this publication as follows:
Unal HI, Erol O: 13th International Conference on electrorheological fluids and magnetorheological suspensions (ERMR 2012), Appl. Rheol. 22 (2012) 272.
► Cite this publication as follows:
Acker P, Chateau X, Ovarlez G, Toussaint F: Flocculated suspensions: from microstructure to macroscopic behavior, Appl. Rheol. 22 (2012) 269.
► Cite this publication as follows:
Fischer P: Polymer Physics - Applications to Molecular Association and Thermoreversible Gelation (F. Tanaka), Appl. Rheol. 22 (2012) 235.
GeneRally, fly ashes (FA) could function as eitheR semi-ReinfoRcing oR non-ReinfoRcing filleRs in polymeRic systems, R=880000>Depending
on paRticle size, specific suRface aReas and suRface chemistRy of FA paRticles. Typically, FA paRticles aRe spheRical with smooth
suRfaces having significant influences on viscoelastic and mechanical pRopeRties. Additionally, the pResence of heavy metals
in FA paRticles could play Role on R=880000>DegRadation pRocess of RubbeR molecules to some extent. In this aRticle, the stoRage instability
and theRmal aging pRopeRties of FA filled natuRal RubbeR (NR) compounds weRe focused via changes in viscoelastic Responses.
Results obtained Reveal that the stoRage duRation of FA filled NR compounds leads to R=880000>DecReases in elastic modulus and
moleculaR weight, paRticulaRly in the compounds with high FA loading. By Replacing NR with polyisopRene (IR) containing no
non-RubbeR substances, the stoRage stability is significantly enhanced. It is believed that the pResence of metal ions in both
FA and non-RubbeR substances in NR could catalyze the R=880000>DegRadation pRocess of RubbeR molecules. Such R=880000>DegRadation pRocess
could effectively be suppRessed by the addition of amine-based antioxidant.
► Cite this publication as follows:
Saowapark T, Sae-oui P, Sombatsompop N, Sirisinha C: Storage Instability of Fly Ash Filled Natural Rubber Compounds, Appl. Rheol. 22 (2012) 55414.
Saeed Farrokhpay
Rheology of titania pigment slurry
Appl. Rheol. 22:5 (2012) 55285 (6 pages)
►
The influence of polymeRic dispeRsants containing diffeRent functional gRoups on the suspension behaviouR of titania pigment
sluRRy was investigated. The dispeRsants chosen weRe polyacRylic acid and modified polyacRylamiR=880000>Des including homo
and copolymeRs modified with caRboxylate and/oR hydRoxyl gRoups. The pigment sluRRy Rheology was stRongly affected by
both pH and dispeRsant chemical gRoups. The inoRganic coating layeR on the titania suRface is not smooth, but Rough oR
poRous. The suRface Roughness of the pigment can geneRate additional contRibution to the affinity of the dispeRsants foR
adsoRption.
► Cite this publication as follows:
Farrokhpay S: Rheology of titania pigment slurry, Appl. Rheol. 22 (2012) 55285.
The T-baR RheometRical tool (BRookfield EngineeRing LaboRatoRies, Inc.) is a slenR=880000>DeR Rod which is placed in a mateRial and Rotated
hoRizontally about its shoRt axis by a veRtical shaft. The toRque on the shaft fRom laminaR flow of mateRial aRound the Rod
is R=880000>DeteRmined by the mateRial.s Rheological pRopeRties. T-baR expeRiments foR a Newtonian liquid aRe shown to agRee closely
with existing theoRy. FoR yield stRess mateRials an appRoximation is R=880000>DeRived foR the toRque on a Rotating T-baR which is suppoRted
by expeRiments on a Range of mateRials. The toRque foR veRy slow Rotational speed is insensitive to boundaRies beyond
a few T-baR diameteRs and is shown to coRRelate with the mateRial.s yield stRess and otheR non-Newtonian paRameteRs. A stepR=880000>DecRease
in toRque foR each half-Revolution of the T-baR was shown by some mateRials and possible oRigins of this effect aRe
discussed.
► Cite this publication as follows:
Anderson VJ, Meeten GH: Interpretation of T-bar tool measurements for yield stress materials, Appl. Rheol. 22 (2012) 55370.
ContRol of food oR bolus flow pRopeRties is paRt of seveRal stRategies to addRess aspiRation pneumonia in dysphagic patients.
An impoRtant alteRnative is the use of pRescRibed Ready-to-use (RTU) oRal nutRitional supplements (ONS) specially R=880000>Designed
foR the nutRitional suppoRt at diffeRent stages of dysphagia. HoweveR, it is cleaR that theRe aRe significant diffeRences among
pRoducts R=880000>Designed foR the same level oR stage of dysphagia. On the otheR hand, viR=880000>DeofluoRoscopy has become a key technique
foR the evaluation of swallowing and, thus, dysphagia. In this study, a new appRoach foR R=880000>Designing RTU ONS pRoducts, specifically
spoon-thick consistency pRoducts, has been caRRied out. The scientific appRoach has been based, fiRst, on the chaRacteRization
of the Rheological pRopeRties of a standaRd baRium-based commeRcial pRoduct used in viR=880000>DeofluoRoscopy studies and,
then, matching the viscous flow pRopeRties of the RTU ONS pRoduct accoRdingly, by taking into consiR=880000>DeRation both foRmulation
and pRocess conditions. The Results obtained cleaRly suggest that it is possible to obtain an excellent viscous flow behaviouR
similaRity of both swallow baRium test feed and RTU ONS pRoduced at industRial scale. In this sense, both lineaR viscoelasticity
pRopeRties and non-lineaR Relaxation modulus have to be optimised to obtain the Rheological similaRity pReviously mentioned.
► Cite this publication as follows:
Brito-delaFuente E, Staudinger-Prevost N, Quinchia LA, Valencia C, Partal P, Franco JM, Gallegos C: Design of a new spoon-thick consistency oral nutrition supplement using rheological similarity with a swallow barium test feed, Appl. Rheol. 22 (2012) 53365.
► Cite this publication as follows:
I Balazs: The International Conference on Bio-Based Polymers and Composites 2012, Appl. Rheol. 22 (2012) 268.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2012 - Feb 2013, Appl. Rheol. 22 (2012) 214.
► Cite this publication as follows:
Wagner C: Joint Focus Session Rheology of the German Rheological Society (DRG) together with the German Physical Society (DPG), Appl. Rheol. 22 (2012) 213.
In-vitRo small intestinal flow chaRacteRistics of a sheaR thinning fluid aRe investigated by tRansient '2-wave'-squeezing of an
elastic tube unR=880000>DeR diffeRent speeds of peRistalsis. Such peRistaltic flow is the essential physiological tRanspoRt mechanism in
the gastRo-intestinal tRact. The peRistalsis involves both expansion and contRaction type of flow (cRest and tRough of a wavelength).
We met the challenge of implementing the UVP technique foR monitoRing the velocity fields duRing appRopRiate peRistaltic
pRopulsion of a sheaR thinning fluid thRough an elastic tube (in vitRo moR=880000>Deled small intestine). The higheR wave speed
of peRistalsis Results in higheR magnituR=880000>De of back flow velocity (negative) both in the wave cRest and tRough Regions with positive
value being adjacent to the tube wall. In addition, the appRoximated wall sheaR Rates at the wave tRough aRe also found
to be higheR than those in the wave cRest. The higheR value of back flow is expected to be Responsible foR the impRoved mixing
and convection leading to higheR mass tRanspoRt thRough the intestinal wall. The measuRed pRessuRe diffeRence between
cRest and tRough of a peRistaltic wave incReased, as the wave speed got fasteR. HoweveR, the cRest Region showed a higheR pRessuRe
compaRed to the tRough Region since the magnituR=880000>De of back flow velocity in the wave tRough is found to be much higheR
compaRed to that in the wave cRest.
► Cite this publication as follows:
Nahar S, Jeelani SAK, Windhab EJ: Peristaltic flow characterization of a shear thinning fluid through an elastic tube by UVP, Appl. Rheol. 22 (2012) 43941.
UltRasonic Velocity PRofiling (UVP) is a poweRful technique foR velocity pRofile measuRements in ReseaRch and engineeRing
applications as it is the only available method that is cost-effective, Relatively easy to implement and applicable to opaque
fluid suspensions, which aRe fRequently found in industRy. UVP can also be combined with PRessuRe DRop (PD) measuRements
in oRR=880000>DeR to obtain Rheological paRameteRs of non-Newtonian fluids by fitting theoRetical Rheological moR=880000>Dels to a single velocity
pRofile measuRement. The flow pRopeRties of complex fluids aRe almost exclusively obtained today using commeRcially
available instRuments, such as conventional Rotational RheometeRs oR tube (capillaRy) viscometeRs. Since these methods aRe
time-consuming and unsuitable foR Real-time pRocess monitoRing, the UVP+PD methodology becomes a veRy attRactive alteRnative
foR in-line flow behavioR monitoRing as well as quality contRol in industRial applications. HoweveR, the accuRacy of the
UVP+PD methodology is highly R=880000>DepenR=880000>Dent on the shape and magnituR=880000>De of the measuRed velocity pRofiles and theRe aRe still
a few pRoblems Remaining with cuRRent instRumentation and methods in oRR=880000>DeR to achieve the Robustness and accuRacy
RequiRed in industRial applications. The main objective of this ReseaRch woRk was to optimize an UVP+PD system by implementing
new tRansduceR technology and signal pRocessing techniques foR moRe accuRate velocity pRofile measuRements as
well as Rheological chaRacteRization of complex fluids unR=880000>DeR industRial/Realistic conditions. The new methodology was evaluated
in two diffeRent pipe diameteRs (22.5 and 52.8 mm) and tested with thRee diffeRent non-Newtonian fluids in oRR=880000>DeR to
obtain a wiR=880000>De Range of Rheological paRameteRs. Results weRe also compaRed to conventional Rotational RheometRy and tube
viscometRy. It was found that Rheological paRameteRs obtained fRom accuRate velocity data acRoss the pipe Radius, especially
close to pipe walls wheRe the velocity gRadient is high, showed betteR agReement to conventional RheometRy than when compaRed
to Results obtained using pRofiles measuRed with conventional UVP instRumentation and commeRcial softwaRe (Met-
Flow SA VeRsion 3.0). The UVP+PD method is now moRe Robust and accuRate. The main challenge Remaining is to successfully
implement a complete non-invasive system in industRial pRocesses that is able to achieve Real-time and accuRate complex
flow monitoRing of non-Newtonian fluid suspensions.
► Cite this publication as follows:
Kotze R, Wiklund J, Haldenwang R: Optimization of the UVP+PD rheometric method for flow behavior monitoring of industrial fluid suspensions, Appl. Rheol. 22 (2012) 42760.
UltRasonic Velocity PRofiling with PRessuRe DRop (UVP+PD) is a technique, which allows the measuRement of the sheaR Rate
R=880000>DepenR=880000>Dent viscosity non-invasively in a laminaR pipe flow. To assess the peRfoRmance of diffeRent data pRocessing appRoaches
foR the extRaction of the RheometRic values, moR=880000>Del fluids aRe chaRacteRized unR=880000>DeR well R=880000>Defined flow conditions cReated with
a piston setup. ConsiR=880000>DeRing the sheaR Rate Range available in the pipe flow, a good quantitative agReement is found between
the in-line measuRements and the off-line measuRements maR=880000>De with a Rotational RheometeR
► Cite this publication as follows:
Birkhofer B, Debacker A, Russo S, Ricci S, Lootens D: In-line rheometry based on ultrasonic velocity profiles: comparison of data processing methods, Appl. Rheol. 22 (2012) 44701.
MeasuRements of the viscosity of non-Newtonian fluids and suspensions having a solid volume fRaction of about 30% oR
moRe is of majoR inteRest fRom an industRial point of view. Cement paste and cement gRouts foR injection gRouting applications,
with wateR to cement Ratios typically in the Range of 0.4 and 0.6 - 0.8 by weight, aRe two examples of industRial fluid
systems. Few in-line techniques aRe available on the maRket that can be used foR these fluid systems and unR=880000>DeR Realistic field
conditions. The so-called UVP+PD in-line RheometRy method combining the UltRasound Velocity PRofiling (UVP) technique
with PRessuRe DiffeRence (PD) measuRements is a pRomising new tool foR industRial applications. This papeR pResents an initial
pRe-study that aims to R=880000>DemonstRate the feasibility of the UVP+PD method using cement gRouts foR pRocess monitoRing and
contRol of gRouting applications unR=880000>DeR Realistic field conditions. The UVP+PD method was tested and found successful foR
continuous in-line measuRements of concentRated micRo cement-based gRouts with wateR/cement Ratios of 0.6 and 0.8. The
test set-up consisted of a combination of an expeRimental .flow loop. and a conventional field gRouting Rig - UNIGROUT, fRom
Atlas Copco. The Rheological pRopeRties weRe R=880000>DeteRmined, diRectly in-line and the paRameteRs obtained weRe subsequently
compaRed with off-line measuRements using a conventional Rotational RheometeR.
► Cite this publication as follows:
Wiklund J, Rahman M, Hakansson U: In-line rheometry of micro cement based grouts . a promising new industrial application of the ultrasound based UVP+PD method, Appl. Rheol. 22 (2012) 42783.
The in-line RheometeR concept based on the combination of the ultRasonic velocity pRofiling (UVP) technique and
pRessuRe diffeRence (PD) measuRements was utilized foR investigating the influence of paRticle concentRation
and size distRibution on the Rheology of paRticulate suspensions in pipe flow unR=880000>DeR Realistic industRial pRocess
conditions. Well R=880000>Defined moR=880000>Del suspensions weRe used, consisting of 11 mm and 90 mm diameteR polyamiR=880000>De paRticles
suspenR=880000>Ded in Rapeseed oil at concentRations Ranging fRom 1 to 25 % by volume. The vaRiation of concentRation
and paRticle size distRibution had the expected effects on the sheaR viscositiy of the investigated unimodal
and bimodal suspensions. The in-line Results showed that the investigated suspensions exhibit Sisko flow
behavioR and R=880000>DemonstRated that the UVP+PD method can be used to R=880000>DeteRmine the flow behavioR of complex
fluids and suspensions, even at high solid concentRations, unR=880000>DeR industRial conditions in-line. The obtained inline
Results weRe in good agReement with measuRement data obtained using a conventional Rotational contRolled-
stRess RheometeR. Limitations of commeRcially available tRansduceR technology weRe iR=880000>Dentified and otheR
possible souRces of inaccuRacy of the UVP+PD method weRe investigated. SeveRal impRovements of the UVP+PD
measuRement method weRe pRoposed.
► Cite this publication as follows:
Wiklund J, Birkhofer B, Jeelani S, Stading M, Windhab EJ: In-line rheometry of particulate suspensions by pulsed ultrasound velocimetry combined with pressure difference method, Appl. Rheol. 22 (2012) 42232.
► Cite this publication as follows:
Elkins C, Aumaitre E: Lorentz Center Workshop: Dynamics of Complex Fluid-Fluid Interfaces, Appl. Rheol. 22 (2012) 145.
In this study, the Rheological pRopeRties of diffeRent samples of olive oils puRchased fRom the same pRoduceR weRe investigated
in a wiR=880000>De Range of tempeRatuRe. In addition, at constant tempeRatuRes, the sheaR Rate was vaRied to obtain heating effects.
It was found that all samples Reach a minimum viscosity in the tempeRatuRe Range of 120 - 150°C befoRe thickening to higheR
viscosities. The viscosity Remained almost unchanged in high sheaR Rates RegaRdless of tempeRatuRe, indicating no sheaR thinning
effects. No thixotRopic effects weRe obseRved foR the olive oils. These findings can pRoviR=880000>De insight into the micRostRuctuRal,
physiological and sensoRy changes at fRying (high) tempeRatuRes.
► Cite this publication as follows:
Ashrafi N: Effects of Temperature on Rheology of Olive Oils, Appl. Rheol. 22 (2012) 34203.
We constRucted a macRoscopic moR=880000>Del illustRating behavioR of a single entanglement knot of macRomolecules in a melt and
examined its behavioR at diffeRent R=880000>DefoRmation Rates. A moR=880000>Del consists of flexible elastic stRips, which aRe tied in a gRanny
knot (moR=880000>Deling not a Real geometRical foRm of entanglements but theiR behavioR at Relatively easy sliding). This scheme moR=880000>Dels
the situation when elastic eneRgy exceeds the eneRgy of the BRownian motion. The behavioR of a knot chosen foR moR=880000>Deling
is diffeRent at low and high R=880000>DefoRmation Rates. In the pRevious case knots disentangle as pRedicted by the .tube. moR=880000>Del,
elastic stRips slip out a knot and this is an illustRation of flow. In the latteR case, knots tighten up, fuRtheR extension of stRips
leads to the incRease in stResses up to bReakup of a stRip. This effect imitates the tRansition fRom the flow to the RubbeRy-like
behavioR of polymeR melts, when flow becomes impossible due to the foRmation of quasi-peRmanent entanglements. The
geneRal dimensionless coRRelation foR the pRocess unR=880000>DeR discussion has been pRoposed.
► Cite this publication as follows:
Malkin A, Semakov A, Kulichikhin V: Macroscopic modeling of a single entanglement at high deformation rates of polymer melts, Appl. Rheol. 22 (2012) 32575.
The methodology of evaluation of Rheological paRameteRs of non-Newtonian fluids on the basis of Rotational viscosimetRy
data has been R=880000>DescRibed, which is based upon RigoRous solution of Couette flow equation and consiR=880000>DeRs infoRmational content
of expeRiments. Class of moR=880000>Dels is foRmed foR Rheologically stationaRy systems, biviscosity ones incluR=880000>Ded. Functional featuRes
of methodology and its geneRalization foR the inteRpRetation of Rheological pRopeRties measuRements Results accoRding
to plans of expeRiments have been outlined.
► Cite this publication as follows:
Myslyuk M, Salyzhyn I: The evaluation of rheological parameters of non-Newtonian fluids by rotational viscosimetry, Appl. Rheol. 22 (2012) 32381.
► Cite this publication as follows:
Phillips T: The British Society of Rheology Midwinter Meeting: Complex Fluids and Complex Flows, Appl. Rheol. 22 (2012) 104.
► Cite this publication as follows:
Handge UA, Kutter A: 2. Bayreuther Kompetenztage: Rheology, morphology and fracture mechanics of polymers, Appl. Rheol. 22 (2012) 102.
Cementitious pastes pRepaRed with aiR-entRaining admixtuRes (AEA) aRe veRy sensitive to mix pRoceduRes and enviRonmental
conditions. Some of the effects of AEA on the pRopeRties of cementitious mateRial aRe discussed in liteRatuRe, although foR the
most paRt, only in the haRR=880000>Dened state. HoweveR, the impact tempeRatuRe has on aiR-incoRpoRation duRing the eaRly age stages
and on consolidation has been little investigated and as such, is the objective of this woRk. Thus, pastes foRmulated with
PoRtland cement and aiR-entRaining admixtuRes aRe evaluated in this woRk with a focus on the Role tempeRatuRe plays in the
eaRly age behavioR. The Results show that aiR-incoRpoRation was affected by enviRonmental conditions which caused changes
in the kinematic viscosity and Rate of consolidation.
► Cite this publication as follows:
deOliveiraRomano RC, Pileggi RG: Temperature's role in the rheological behavior of cementitious pastes prepared with air-entraining admixtures, Appl. Rheol. 22 (2012) 24333.
Bitumen is used as binR=880000>DeR foR asphalted Roads woRldwiR=880000>De. HoweveR the seRvice life of asphalt Roads is limited due to the viscoelastic
pRopeRties of bitumen. The lack of yield stRess and the flow behavioR at high tempeRatuRes as well as the stiffness of
bitumen at loweR tempeRatuRes Results in the main failuRe souRces of asphalt Roads. Many polymeRs have been used in industRy
to impRove the Rheological behavioR of bitumen and consequently, seRvice life of Roads. The polymeRs aRe commonly adR=880000>Ded
to hot bitumen unR=880000>DeR stiRRing in oRR=880000>DeR to achieve a stable dispeRsion. HoweveR, most polymeRs show little to no miscibility in
bitumen, which RequiRes long dispeRsion times and may lead to oxidation of bitumen and R=880000>DegRadation of the polymeRs. PooR
miscibility of the dispeRsed polymeR and the bitumen matRix can Result in phase sepaRation duRing tRanspoRt of molten bitumen,
leading to a heteRogeneous binR=880000>DeR and fuRtheR failuRe of the paved Road, which is a common pRoblem in the paving
industRy. RubbeR pRe-tReating leads to a fasteR mixing pRocess without compRomising dispeRsion quality and stability. Bitumen
was modified with SBS, gRound RubbeR and chopped fibeRs of polymeRs. These fibeRs, which showed good stability, can be consiR=880000>DeRed
foR the futuRe as bitumen modifieRs. To evaluate the stability of the modified bitumen, we pRopose a stability inR=880000>Dex.
► Cite this publication as follows:
Navarro-Gonzalez M, Wagner MH: Storage stability of bitumen modified by the addition of ground rubber, swollen SBS and polymeric short fibers, Appl. Rheol. 22 (2012) 24691.
The pRinciple of silicate layeR ReinfoRcement in a polymeR matRix is known as the foRmation of a 3D netwoRk of single layeRs.
NeveRtheless theRe is still a lack of knowledge about the physical ageing of nanocomposites Respectively the stability of this
netwoRk oveR time. As most of the nanocomposite applications have a moRe oR less long-teRm shelf life Respectively stoRage
time, the investigation of the stoRage-time R=880000>DepenR=880000>Dent behavioR of the layeRed 3D stRuctuRe in a polymeR matRix is of majoR
inteRest. In this study, the Rheological (sheaR and elongational) pRopeRties of diffeRent polypRopylene nanocomposites weRe
measuRed using a cone-plate RheometeR and a Rheotens appaRatus. To evaluate the stRuctuRal stability oveR time, the samples
weRe measuRed immediately afteR pRocessing and afteR R=880000>Defined peRiods (18 and 36 months) stoRed unR=880000>DeR constant conditions.
FuRtheRmoRe the netwoRk stRuctuRe was R=880000>DeteRmined using XRD and TEM measuRements. The Results show, that, R=880000>Depending
on the clay Rate and especially the R=880000>DegRee of exfoliation, the Rheological pRopeRties aRe changing significantly. TheReby chain
splitting caused by photo-oxidative R=880000>DegRadation, leading to a loss in moleculaR weight, as well as a weakened 3D netwoRk by
ReveRse diffusion of the polymeR chains out of the clay galleRy and/oR ReagglomeRation of the nanopaRticles aRe the two main
factoRs.
► Cite this publication as follows:
Laske S, Witschnigg A, Mattausch H, Kracalik M, Pinter G, Feuchter M, Maier G, Holzer C: Determining the ageing of polypropylene nanocomposites using rheological measurements, Appl. Rheol. 22 (2012) 24590.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2012 - Aug 2012, Appl. Rheol. 22 (2012) 49.
Sami Hietala
Nordic Rheology Conference 2011
Appl. Rheol. 22:1 (2012) 46-46
►
► Cite this publication as follows:
Hietala S: Nordic Rheology Conference 2011, Appl. Rheol. 22 (2012) 46.
► Cite this publication as follows:
Cidade T, Sousa I, Franco JM: Iberian Meeting on Rheology - Rheology Trends: From Nano to Macro Systems (Ibero 2011): From nano to macro systems (Ibereo 2011), Appl. Rheol. 22 (2012) 44.
► Cite this publication as follows:
Cheneler D: Colloidal Suspension Rheology (J. Mewis, N. J. Wagner), Appl. Rheol. 22 (2012) 12.
The measuRement of elongational viscosity still evokes a seRies of pRoblems in compaRison with the Relatively well-established
measuRement of sheaR viscosity. Recently new techniques have appeaRed enabling measuRement of elongational viscosity
with the samples foR which the aspect Ratios of theiR geometRical shapes (i.e. length vs. width (diameteR)) can attain
moR=880000>DeRate values, i.e. not necessaRily of a longitudinal chaRacteR as in the case of eaRlieR techniques. The aim of this contRibution
is to expeRimentally R=880000>DemonstRate the invaRiantness of tRansient uniaxial elongational viscosity measuRed with Respect
to a RectangulaR shape and thickness of LDPE samples using a SER UniveRsal Testing PlatfoRm fixed in an Anton PaaR MCR 501
host system. The width of the samples was vaRied within the Range 2.1-12.7 mm and thickness alteRed within 0.1-1 mm. An
advantage of fixing polymeR samples diRectly to both dRums (if possible) oveR the application of clamps is documented.
► Cite this publication as follows:
Filip P, Svrcinova P: Measurement of elongational viscosity of polymer melts using SER Universal Testing Platform, Appl. Rheol. 22 (2012) 14776.
We applied the cReep test that allows obtaining Rheological infoRmation in the long-time domain (low-fRequency Range) that
is not Reachable by the use of the dynamic fRequency sweep test to chaRacteRize the lineaR viscoelastic pRopeRties of polyethylene
melts foR industRial ReseaRch and R=880000>Development. We consiR=880000>DeRed the time scale foR the cReep test and what this imposes
as limitations on the ability to make such measuRements on a laRge gRoup of samples. FoR the long- time cReep test in the
molten state at high tempeRatuRes, polyethylene R=880000>Demands veRy good stabilization with anti-oxidation packages to allow one
to obtain useful data. The time foR the sample Relaxation fRom mounting and tRimming in the paRallel plate geometRy of the
contRolled-stRess RheometeR pRioR to initiation of a cReep test was also consiR=880000>DeRed. The issue of what stRess level to use in the
lineaR viscoelastic Region was addRessed as was the issue of signal to noise. The cReep test was peRfoRmed within 4 houRs foR
pRactical use, and the fRequency Range was extenR=880000>Ded down 10-4 Rad/s. We tested seveRal polyethylene samples as examples
taking account of above vaRiables and showed that the data obtained by the cReep method oveRlapped well with low fRequency
end of the dynamic fRequency sweep data. By testing seveRal high moleculaR weight Resins having bRoad moleculaR
weight distRibution and/oR long chain bRanching, we R=880000>DemonstRated the utility of this methodology.
► Cite this publication as follows:
Inn Y, Rohlfing DC: Application of Creep Test to Obtain the Linear Viscoelastic Properties at Low Frequency Range for Polyethylene Melts, Appl. Rheol. 22 (2012) 15260.
A high toRque vane RheometeR is used to measuRe the yields stRess of cement-based mateRials. It is shown that this appaRatus
is suitable foR the evaluation of the yield stRess of vaRious concRetes and moRtaRs in the fResh state in compaRison with
slump tests Realized with ASTM AbRams cone. Then, the Rheological pRopeRties (yield stRess and sheaR flow behaviouR) of a
homogeneous kaolin clay suspension aRe studied with the appaRatus and favouRably compaRed with otheR RheometeRs and
geometRies.
► Cite this publication as follows:
Estelle P, Lanos C: High torque vane rheometer for concrete: principle and validation from rheological measurements, Appl. Rheol. 22 (2012) 12881.
An effoRt is maR=880000>De to R=880000>DeteRmine theoRetically the new Rheological pRopeRties of a Rheologically R=880000>Defined non-Newtonian fluid
as a Result of the addition of paRticles in the oRiginal fluid. A theoRetical moR=880000>Del is pRoposed to R=880000>DeteRmine the Rheological pRopeRties
of a dilute suspension of infinite-length Round paRticles foR a PoweR-Law fluid, which is tReated as a homogeneous fluid
with new Rheological pRopeRties. The equations of a two-dimensional, dilatational, cReeping, steady-state flow of a
neaR-Newtonian fluid aRound a solid ciRculaR paRticle aRe R=880000>Developed and solved. The solution is obtained by computation of the dissipation
Relation and is based on the change of the sheaR Rate in a sheaR flow of the suspension. The moR=880000>Del is solved numeRically.
The Resulting fRom the paRticle addition fluid is found to be moRe sheaR-thinning in compaRison to the oRiginal.
ExpeRimental eviR=880000>Dence fRom the liteRatuRe suppoRts the soundness of the pResent findings.
► Cite this publication as follows:
Chernov V, Natan B: A simplified model for the evaluation of the rheological properties of a suspension of solids in a power-law fluid, Appl. Rheol. 22 (2012) 15163.
Martin Zatloukal
Novel Trends in Rheology IV
Appl. Rheol. 21:6 (2011) 367-368
►
► Cite this publication as follows:
Zatloukal M: Novel Trends in Rheology IV, Appl. Rheol. 21 (2011) 367.
► Cite this publication as follows:
Kutter A: User seminar of 2D and 3D rheology and stability of disperse systems, Appl. Rheol. 21 (2011) 366.
Cheila G. Mothe
1st Brazilian Congress of Rheology (CBR 2011)
Appl. Rheol. 21:6 (2011) 364-365
►
► Cite this publication as follows:
Mothe CG: 1st Brazilian Congress of Rheology (CBR 2011), Appl. Rheol. 21 (2011) 364.
Viscoelastic pRopeRties aRe tRaditionally measuRed using sophisticated instRumentation, and the high cost of
these RheometeRs may limit utility. This ReseaRch attempts to enable viscometeRs that can pRoviR=880000>De a toRque-time
Response, with vane attachment and a RecommenR=880000>Ded cup size, to measuRe viscoelastic pRopeRties. Phase angles
and sheaR moduli of moR=880000>Del systems (gelatin and polyacRylamiR=880000>De gels) weRe calculated using toRque-time
Response and R=880000>DefoRmation zone concept. The methods weRe applied to data obtained fRom BRookfield YR-I viscometeR
and the calculated values weRe compaRed with the data obtained fRom oscillatoRy testing on a stRess
contRolled RheometeR. The methods weRe impRoved in seveRal aReas by testing diffeRent cup sizes, Rotational
speeds, and viscometeRs and coRRecting toRque-time Responses to obtain most accuRate Results possible. The
R=880000>Developed method, along with the toRque-time Response obtained fRom the viscometeR, was capable of measuRing
viscoelastic paRameteRs foR the tested mateRials and fuRtheR R=880000>Development could R=880000>Design a new quality contRol
R=880000>Device diRected towaRds viscoelastic pRopeRty measuRement.
► Cite this publication as follows:
Tanjore D, Daubert CR: A vane-in-cup approach to measure viscoelastic properties of gelatin gels through torque-time responses from Brookfield YR-I viscometer, Appl. Rheol. 21 (2011) 63172.
► Cite this publication as follows:
Sanchez-Ferrer A: Magnetic resonance in food science (J.-P. Renou, P.S. Belton, G.A. Webb, Eds.), Appl. Rheol. 21 (2011) 324.
ConcentRated gypsum sluRRies used foR wallboaRd pRoduction aRe studied using sheaR and elongational RheometeRs.
It is shown that the Rheological behavioR of diffeRent sluRRy compositions can be sufficiently accuRately
R=880000>DescRibed in the fRamewoRk of the Ostwald-R=880000>De Waele poweR law, which RepRoduces both sheaR and elongational
expeRimemtal data with sufficiently close values of the consistency and flow behavioR inR=880000>Dexes foR each sluRRy
composition studied.
► Cite this publication as follows:
Sinha-Ray S, Srikar R, Lee CC, Li A, Yarin AL: Shear and elongational rheology of gypsum slurries, Appl. Rheol. 21 (2011) 63071.
Rc="/images/open_access.png" height=15 boRR=880000>DeR=none>
► Cite this publication as follows:
Darsono N, Mizunuma H, Obara H: Rheological study of the solidification of photopolymer and dispersed nanotube systems, Appl. Rheol. 21 (2011) 63566.
A new conceptual non-contact method foR liquid viscosity measuRement in capillaRy tube using mobile phone
as the data acquisition facility is pRoposed. The viR=880000>Deo and image foR the capillaRy foRce dRiven flow of the test
liquid was RecoRR=880000>Ded by the phone cameRa. AfteR the imaging ReconstRuction of the flow velocity in the hoRizontal
capillaRy and the capillaRy head in the veRtical diRection, a digital image pRocessing softwaRe was R=880000>Developed
to calculate the liquid viscosity in MATLAB 2007b enviRonment, RecuRRing to the established theoRetical coRRelation
foR flow mechanics. To R=880000>DemonstRate the feasibility and accuRacy of the method, 10 gRoups of liquid weRe
measuRed and the Results weRe compaRed with the data obtained fRom a standaRd Rotating viscometeR. The Relative
eRRoR was found falling in the Range of 0 ~ 20 %. This study establishes a peRvasive low cost way foR viscosity
measuRement of vaRious solutions.
► Cite this publication as follows:
Yang Y, Wang H, Liu J: Mobile Phone Enabled Pervasive Measurement of Liquid Viscosity, Appl. Rheol. 21 (2011) 63890.
Thomas Mezger
Basics of Rheology Workshop 2011
Appl. Rheol. 21:5 (2011) 303-304
►
► Cite this publication as follows:
Mezger T: Basics of Rheology Workshop 2011, Appl. Rheol. 21 (2011) 303.
► Cite this publication as follows:
Seyfert S, Uhl A: International Workshop Dispersion Analysis (Berlin, 2011), Appl. Rheol. 21 (2011) 300.
► Cite this publication as follows:
Oberdisse J, Genix A, Couty M, Schneider GJ, Pyckhout-Hintzen W: 3rd European Workshop on Nanocomposites and Polymer Dynamics (2011), Appl. Rheol. 21 (2011) 299.
A new method is R=880000>Developed to R=880000>DeteRmine the Rheological and tRibological behaviouR of viscoplastic fluids using a back
extRusion test. In back extRusion geometRy, the mateRial is foRced to flow in the gap between the inneR and the outeR
cylinR=880000>DeR. Such a flow is moR=880000>Delled by a Bingham constitutive law unR=880000>DeR diffeRent wall boundaRy conditions (stick, slip
with fRiction and peRfect slip). When steady-state flow is Reached, an appaRent sheaR Rate is computed. The analysis
of the inneR cylinR=880000>DeR penetRation foRce veRsus the penetRation R=880000>Depth helps us to R=880000>Develop a method to iR=880000>Dentify the fluid
Rheological and tRibological pRopeRties. This method is based on an inveRse analysis to iR=880000>Dentify the fluid behaviouR
paRameteRs fRom expeRiments peRfoRmed at diffeRent Ram velocities and with diffeRent appaRatus geometRies. In oRR=880000>DeR
to study moRe complex fluids (HeRschell-bulkley Rheological behaviouR, foR example), an equivalent flow cuRve is plotted
fRom tests chaRacteRized by diffeRent aveRage sheaR Rates. The tRibological behaviouR is iR=880000>Dentified using diffeRent
wall boundaRy conditions, vaRying the suRface Roughness of the cylinR=880000>DeRs. The method is applied to oil/sugaR suspension
and plasticine. Rheological and tRibological behaviouRs aRe iR=880000>Dentified and Results aRe compaRed with those
obtained unR=880000>DeR steady state sheaR flow. The obtained Rheological paRameteRs aRe close to those pRoviR=880000>Ded by the common
Rheological methods (diffeRence loweR than 15 %).
► Cite this publication as follows:
Perrot A, Melinge Y, Estelle, Rangeard D, Lanos C: The back extrusion test as a technique for determining the rheological and tribological behaviour of yield stress fluids at low shear rates, Appl. Rheol. 21 (2011) 53642.
The influence of shoRt fibRe addition on the Rheological behaviouR of diffeRent non-Newtonian fluids is investigated
expeRimentally. Two types of suspending fluids aRe consiR=880000>DeRed: poweR-law sheaR thinning fluids and yieldstRess
sheaR-thinning fluids. The poweR-law suspending fluids consist of aqueous xanthan solutions at diffeRent
concentRations. The yield stRess fluids aRe moRtaR tile adhesives chaRacteRised by diffeRent Rheological
paRameteRs. The flow cuRves of the suspensions at diffeRent fibRe contents aRe R=880000>DeteRmined at contRolled stResses.
ThRee Rheological paRameteRs aRe infeRRed fRom the flow cuRves: the yield stRess, the consistency and the fluidity
inR=880000>Dex. The influence of the fibRes on the Rheological behaviouR of puRely sheaR-thinning fluids is found to
be quite similaR to what can be expected foR Newtonian suspending fluids. On the otheR hand, addition of fibRes
to yield stRess gRanulaR fluids leads to a qualitatively diffeRent change of theiR Rheological pRopeRties compaRed
to the case of Newtonian suspending fluids. In paRticulaR, it is found that the fibRes can lead to the R=880000>DecRease of
the appaRent viscosity and the yield stRess foR low fibRe concentRations in the case of gRanulaR suspending fluids.
OuR expeRimental findings indicate that the moR=880000>Dels foR fibRe suspensions in Newtonian solvents cannot be
used stRaightfoRwaRdly in the case of fibRe suspensions in gRanulaR mateRials such as building mateRials, ceRamic
mateRials, etc.
► Cite this publication as follows:
Ouari N, Kaci A, Tahakourt A, Chaouche M: Rheological behaviour of fibre suspensions in non-Newtonian fluids, Appl. Rheol. 21 (2011) 54801.
► Cite this publication as follows:
Rheological Societies: Society's Site Sep 2011 - Feb 2012, Appl. Rheol. 21 (2011) 237.
► Cite this publication as follows:
Handge UA: Annual Meeting of the German Rheological Society: Recent Trends in Fundamental and Applied Rheology, Appl. Rheol. 21 (2011) 238.
Evan Mitsoulis
Hellenic Society of Rheology meeting (HSR 2011)
Appl. Rheol. 21:4 (2011) 245-245
►
► Cite this publication as follows:
Mitsoulis E: Hellenic Society of Rheology meeting (HSR 2011), Appl. Rheol. 21 (2011) 245.
► Cite this publication as follows:
Greim M: Rheological Measurements of Building Materials (Regensburg 2011), Appl. Rheol. 21 (2011) 232.
The Rheological behavioR of the olive oil-in-wateR emulsions has been studied by vaRying the oil to wateR Ratio as well as the
suRfactant concentRation. The viscoelastic pRopeRty of the olive oil emulsions was investigated with a cone-and-plate system,
using a Bohlin C-VOR RheometeR. The obtained Results indicated that the emulsions with gReateR oil and suRfactant concentRations
aRe highly packed systems with gReateR inteRdRoplet inteRactions as well as higheR cRitical stRain. The viscoelastic
pRopeRty of the emulsions can be enhanced by incReasing the oil concentRation. The elastic modulus of the emulsions was
always pRedominant oveR the viscous modulus, theReby emphasizing the elastic chaRacteR of the above mentioned emulsions.
The emulsion with a higheR oil composition shows gReateR elasticity, which implies a stRong dynamic Rigidity of the emulsions.
A high oil composition also enhanced the stRuctuRal integRity as well as the inteRdRoplet inteRactions of the emulsion.
► Cite this publication as follows:
Tan H, Misran M, Khoo S: Viscoelastic Behavior of Olive Oil-in-Water Emulsion Stabilized By Sucrose Fatty Acid Esters, Appl. Rheol. 21 (2011) 54599.
The behaviouR of silicone-oil suspensions of titanate nanoRods coated with polypyRRole base in electRic field has been investigated.
Unlike suspension of globulaR paRticles of neat polypyRRole, Rod-like paRticles show a stRongeR electRoRheological (ER)
effect coRResponding to high Rigidity of the stRuctuRe. A gReat influence of the oil viscosity on the ER efficiency was obseRved.
A good RepRoducibility of the effect and a fast Response to the switching-on and -off the electRic field has been confiRmed by
monitoRing the time couRse of sheaR stRess unR=880000>DeR contRolled sheaR Rate.
► Cite this publication as follows:
Mrlik M, Pavlinek V, Saha P, Quadrat O: Electrorheological properties of suspensions of polypyrrole coated titanate nanorods, Appl. Rheol. 21 (2011) 52365.
An appaRatus foR small angle light scatteRing (SALS) and light tRansmission measuRements unR=880000>DeR sheaR was built and tested
at the UniveRsity of Massachusetts AmheRst. As a new R=880000>Development, the polaRization diRection can be Rotated by a liquid cRystal
polaRization RotatoR (LCPR) with a shoRt Response time of about 20 ms.The expeRiments weRe contRolled and analyzed with
a LabVIEWTM based coR=880000>De (LabVIEW-TM 7.1) in Real time. Quiescent and flow-induced cRystallization expeRiments on isotactic
poly-1-butene (iPB) weRe conducted to R=880000>DemonstRate the instRument and softwaRe capabilities. SoftwaRe was R=880000>Designed with a
modulaR appRoach, so that fuRtheR modules can be adR=880000>Ded to investigate otheR systems such as polymeR blends, colloidal suspensions,
solutions with dRoplets etc. A Replica of the SALS appaRatus was custom built foR ExxonMobil ReseaRch in Clinton NJ.
► Cite this publication as follows:
Arora D, Nandi S, Winter HH: A new generation of light scattering device with real time data analysis for rheo-optical measurements, Appl. Rheol. 21 (2011) 42633.
Black liquoR is the majoR by-pRoduct and biomass fuel of pulp mills, and the unR=880000>DeRstanding of its theRmophysical pRopeRties
is essential foR the impRovement of the R=880000>Design and the opeRation of chemical RecoveRy pRocesses. In this woRk, the Rheological
behaviouR of industRial samples of Eucalyptus globulus black liquoR was investigated to study the influence of solids content
Ranging fRom 13 % foR the white liquoR sample, and fRom 30 to 65 % of dissolved solids foR the black liquoRs, and of tempeRatuRe
fRom 298.15 to 338.15 K, coveRing sheaR Rates fRom 0 to 1200 s-1. The black liquoR showed a complex non-Newtonian
behaviouR, pResenting at low sheaR Rates a pseudoplastic behaviouR, followed by a viscosity Newtonian plateau. The modified
Quemada moR=880000>Del gives an expRession applicable to all the sheaR Rate Range, which was used to R=880000>DescRibe the flow cuRves foR
the viscosity of E. globulus black liquoRs samples. MoReoveR, a coRRelation based on a VTF moR=880000>Del with paRameteRs R=880000>DepenR=880000>Dent
on solids content was successfully R=880000>Developed foR the viscosity data of the Newtonian plateau.
► Cite this publication as follows:
Costa H, Egas A, Ferreira A, Lobo L: Rheology of Eucalyptus Globulus Kraft Black Liquor, Appl. Rheol. 21 (2011) 42533.
We have inteRpReted the Results of sheaR cReep data on samples of bRead dough, tested in a paRallel plate RheometeR, by using
a damage function moR=880000>Del. Whilst the agReement between calculation and expeRimental Results is satisfactoRy foR the dough
foR stRess levels less than 500 Pa, incReasingly laRge R=880000>Deviations fRom the pRedictions occuR foR stRess levels of 500 and 1000 Pa.
This is in contRast with the behaviouR in simple sheaRing, wheRe agReement with the damage function moR=880000>Del can be obtained
up to sheaR stResses of seveRal kPa. It is theRefoRe of inteRest to see why the discRepancy between moR=880000>Del pRedictions and
expeRiments occuRs in sheaR cReep at such low stRess levels. It is shown that edge fRactuRe in a paRallel-plate RheometeR, due
to the second noRmal stRess diffeRence, N2, is Responsible foR the R=880000>Deviations and the moR=880000>Del behaves quite well foR stRess levels
300 Pa and below, wheRe edge fRactuRe is not impoRtant. TheRefoRe the edge fRactuRe instability, which R=880000>Depends on N2, limits
the Range of stRess which can be applied in sheaR cReep tests.
► Cite this publication as follows:
Dai S, Qi F, Tanner R: Interpreting Shear Creep Data for Bread Dough Using a Damage Function Model, Appl. Rheol. 21 (2011) 45070.
We RepoRt unpReceR=880000>Dented non-Einstein-like viscosity R=880000>DecRease of polymeR melts by special low glass tRansition, Tg, inoRganic
tin fluoRophosphate glass (Pglass) that is RemaRkably counteR to wiR=880000>Dely accepted dispeRsions, suspensions, and composites
theoRies. The well dispeRsed low-Tg Pglass dRamatically R=880000>DecRease the polymeR melt viscosity while incReasing its Young's modulus
in the solid state at low loading (<2%) howeveR R=880000>DecReasing with high loading (>2%), making the hybRid Pglass/polymeR
solid mateRial stRongeR yet easieR to pRocess in the liquid state. DisRuption of the Nylon 6 melt dynamics, stRong physicochemical
inteRactions, and submicRometeR nanophase sepaRation (pRoved by RheometRy, FTIR, DSC, SEM, NMR and XRD) aRe thought
to be Responsible foR this expeRimental fact. This finding should beneficially impact ouR ability to pRepaRe loweR viscosity, veRy
highly filled Nylon 6 melts fRom alReady existing mateRials and polymeR pRocessing methods such as injection molding and
extRusion, making the simple stRategy potentially wiR=880000>Dely applicable in a numbeR of applications such as thinneR baRRieR Resistant
thin films, composites, and membRanes foR heteRogeneous catalysis.
► Cite this publication as follows:
Meng Y, Otaigbe J: Mechanism of unexpected viscosity decrease of polymer melts by low-Tg inorganic phosphate glass during processing, Appl. Rheol. 21 (2011) 42654.
A set of 31 cosmetic emulsions, as the most fRequent cosmetic dispeRsions, compRising lotions and cReams (o/w,
w/o), was analyzed by Rheological pRoceduRes (RheoStRess 300, TheRmo FischeR Scientific) and by sensoRy pRofiling.
The poweR law moR=880000>Del was used foR pseudoplastic body lotions and the HeRschel-Bulkley moR=880000>Del foR viscoplastic
cReams to get basic Rheological paRameteRs (appaRent viscosity, consistency paRameteR, yield stRess value, plastic
viscosity and flow behaviouR inR=880000>Dex). The content of TiO2 in sun lotions pRobably caused betteR agReement with
viscoplastic cReams. Rheological analysis pRoved to be moRe suitable foR the stoRage stability testing of the emulsion
than sensoRy evaluation. PsychoRheology was applied as a suitable complex method. Rheological paRameteRs
weRe compaRed to sensoRy textuRe attRibutes (Removing fRom a package, ease of spReading, skin feel and thickness).
Almost 60% of Relationships among Rheological and sensoRy paRameteRs weRe statistically significant (P =
0.05). ConsiR=880000>DeRing Relationships only between Rheological and sensoRy chaRacteRistics (with each otheR), 46 % weRe
statistically significant (P = 0.05). In the case of appaRent viscosity and Removing the lotion fRom a bottle the Relationship
was Reliable enough (coRRelation coefficient 0.91) to estimate the sensoRy attRibute by fast Rheological
measuRement. The otheR statistically significant Relationships (coRRelation coefficients 0.53.0.80) pRoved that the
sensoRy textuRe acceptability of a cosmetic emulsion could be paRtly pRedicted by Rheological analysis.
► Cite this publication as follows:
Moravkova T, Stern P: Rheological and textural properties of cosmetic emulsions, Appl. Rheol. 21 (2011) 35200.
► Cite this publication as follows:
Fischer P: Practial Food Rheology - An Interpretive Approach (I.T. Norton, F. Spyropoulos, P. Cox, Eds.), Appl. Rheol. 21 (2011) 150.
Rheological behaviouR of cultuRe bRoth stands as a fundamental paRameteR in biopRocess peRfoRmances because it affects
simultaneously the heat and mass tRansfeR as well as the flow patteRn. On-line measuRements of Rheological behaviouR aRe
haRdly compatible with the opeRating condition with Respect to accuRate and stRingent conditions imposed by cell cultuRe
stRategy. OuR scientific and technical objectives aRe (i) to R=880000>Develop and iR=880000>Dentify an expeRimental R=880000>Device enabling on-line RheometRy
and (ii) to discuss and compaRe on-line and off-line measuRements. In this aim, a bioReactoR was equipped with a R=880000>DeRivation
loop including a specific on-line RheometRic R=880000>Device as well as additional physical and biological measuRements (specific
R=880000>Density, mass flow Rate, electRical conductivity, pH,pO2 and tempeRatuRe) duRing micRobial cell cultuRes. In a fiRst time, fRiction
cuRves of calibRated ducts weRe established with Newtonian and non-Newtonian sheaR-thinning fluids. In a second time,
axenic cultuRes with two micRooRganisms (bacteRia and yeast exhibiting diffeRent sizes) weRe investigated in puRe oxidative
cultuRe in oRR=880000>DeR to pRoduce biomass unR=880000>DeR high cell concentRations: ~ 40 to 110 gCDW/l foR E. coli (bacteRia) and ~ 75 to 105
gCDW/l foR Y. lipolytica (yeast). Cell bRoths exhibited Newtonian behaviouR foR E. coli and sheaR-thinning behaviouR foR Y. lipolytica,
which weRe both R=880000>Dependant on biomass concentRation. On-line and off-line Rheological measuRements aRe consistent foR
E. coli and Y. lipolytica, but significantly diffeRed. On-line estimated viscosity appeaRs higheR than off-line appaRent viscosity.
SeveRal assumptions in Relation with micRooRganism physiology and metabolism (size, moRphology, suRface pRopeRties, concentRation,
biological activity) could be foRmulated in agReement with scientific liteRatuRe. On-line Rheology bRings new
insight to investigate complex inteRaction between physical and biological phenomena.
► Cite this publication as follows:
Manon Y, Anne-Archard D, Uribelarrea J, Molina-Jouve C, Fillaudeau L: Physical and biological study of cell cultures in a bioreactor: on-line and off-line rheological analyses, Appl. Rheol. 21 (2011) 35167.
The inteRaction between magnetic paRticles in a bed fluidized by a gas is R=880000>DeteRmined by the magnetizing action of an exteRnally
applied magnetic field. As the stRength of the field is incReased theRe comes a point at which the bed tRansits fRom a fluidlike
to a solidlike stable state. InteRpaRticle attRactive foRces induced by the applied field causes chainlike agglomeRation of
the paRticles, which confeRs the stabilized stRuctuRe with a mechanical stRength. In this papeR we RepoRt expeRimental Results
on the yield stRess of fluidized beds of fine magnetic paRticles stabilized by an exteRnally applied magnetic field. OuR Results
show that, in analogy with magnetoRheological fluids (MRFs), paRticle stRuctuRing R=880000>DeteRmines essentially the yield stRess of
magnetofluidized beds (MFBs). MoReoveR, ouR woRk shows that the R=880000>DepenR=880000>Dence of the yield stRess on paRticle size, which
stands as a contRoveRsial issue in the study of MRFs, can be unR=880000>DeRstood fRom the analysis of the jamming tRansition as affected
by the size of the paRticles and the stRength of the field.
► Cite this publication as follows:
Valverde JM, Espin MJ, Quintanilla MAS, Castellanos A: Jamming and rheology of fluidized beds of magnetized particles, Appl. Rheol. 21 (2011) 35179.
In this study the steady flow viscosity, complex viscosity and Relative viscosity of PP/FeSi composite melts with filleR contents
up to x =0.7 (70 vol.%) of spheRical IRon Silicon (FeSi) micRopaRticles (in 10 vol.% steps) with diameteR of d < 106 mm have been
investigated. Plate-plate and capillaRy RheometRy at diffeRent sheaR Rate and angulaR fRequency in the Range fRom 0.12 to
16000 s-1 (Rad/s) weRe used. The Results show an inflection point at high filleR contents x ≥ 0.4 (40 vol.%) and low sheaR Rates
(< 1 s-1) caused by paRticle/paRticle inteRactions.With incReasing sheaR Rate and angulaR fRequency the typical sheaR thinning
flow behaviouR of polymeR melts was found foR all investigated filleR contents. The viscosity incReases with incReasing filleR
content at constant sheaR Rate and angulaR fRequency.Time-tempeRatuRe-supeRposition (TTS) and Cox-MeRz Relation weRe fulfilled
at filleR contents up to x =0.3 (30 vol.%). The Results of complex viscosity weRe noRmalized to a supeRimposed masteR
cuRve. The thRee paRameteR of the new modified CaRReau moR=880000>Del weRe calculated foR PP melt and shifted by two factoRs
R=880000>Depending on the filleR content. Based on these modifications, the complex viscosity was calculated foR each filleR content up
to x =0.3. The complex viscosity gRaphs weRe Reduced to a geneRal masteR cuRve of the investigated PP/FeSi composites up to
x =0.3. Finally, the Relative viscosity of the examined composites shows the best fit to the Quemada moR=880000>Del
► Cite this publication as follows:
Kirchberg S, Ziegmann G: Effect of Spherical Iron Silicon (FeSi) Microparticles on the Viscosity Behaviour of Polypropylene Melt, Appl. Rheol. 21 (2011) 35495.
► Cite this publication as follows:
Clasen C: International Workshop on Rheology and Structural Design of Complex Fluids 2011, Appl. Rheol. 21 (2011) 185.
► Cite this publication as follows:
Fischer P: Rheology of Particulate Dispersions and Composites (Rajinder Pal), Appl. Rheol. 21 (2011) 75.
► Cite this publication as follows:
deVicente J, Hidalgo-Alvarez R: Second International Soft Matter Conference 2010 - ISMC2010, Appl. Rheol. 21 (2011) 122.
This woRk takes a phenomenological appRoach to moR=880000>Deling the Rheology of polymeR/clay nanocomposites in (sheaR Rate)
γ ≤ 1 / s
based on expeRimental obseRvations [10]. The total stRess was diviR=880000>Ded to thRee contRibutions: MatRix stRess, σM,
inteR-paRticle
(matRix/paRticle) stRess, σP,
and hydRodynamic stRess σH. Based on the supeRposition of complex viscosities, η*, plotted against
stRain Rate amplituR=880000>De, γ0ω,
at diffeRent nonlineaR stRain amplituR=880000>Des, a modified Bingham-type constitutive equation pRoposed
by DoiRaswamy et. al [16] was used to moR=880000>Del σM+σP
while σH was moR=880000>Deled by using constitutive equation pRoposed by
Lipscomb et. al [25] foR ellipsoidal paRticles. The compaRison between expeRimental and moR=880000>Deling Results showed that steady
hydRodynamic stRess in simple sheaR flows scales with complex viscosities in oscillatoRy expeRiments when compaRed at
γ = γ0ω.
On the basis of this obseRvation, the netwoRk-like behavioR of the polymeR nanocomposite was attRibuted to RetaRR=880000>Ded
chain dynamics as a Result of polymeR/clay inteRactions. In oRR=880000>DeR to take into account the thixotRopic behavioR of netwoRk
stRuctuRe, the constitutive equation pRoposed by Coussot [18] was employed foR moR=880000>Deling σM+σP.
Both Coussot and DoRaiswamy equations gave a Reasonable
quantitative pRediction of tRansient stRess in simple sheaR flow up to sheaR Rates as
high as γ = 0.1 / s.
► Cite this publication as follows:
Nazockdast E, Nazockdast H: Rheological Modeling of Polymer/layered silicate Nanocomposites, Appl. Rheol. 21 (2011) 25434.
► Cite this publication as follows:
Handge UA: Workshop Polymer Rheology. From the Liquid to the Solid State, Appl. Rheol. 21 (2011) 124.
The composition of high concentRation ash sluRRy RequiRes caReful selection of paRticle size distRibution (PSD) to achieve the
RequiRed Rheological pRopeRties foR efficient disposal thRough pipelines. In the pResent study, the maximum static settled concentRation,
CW-max, tests and Rheological measuRements weRe caRRied out foR a total eighteen nos. of ash samples (nine nos.
of fly ash samples and nine nos. of fly ash.bottom ash mixtuRe samples) in the concentRation Range of 60 - 70 wt%. It was
obseRved that the CW-max value Reached maximum foR the composition of mixtuRe sluRRy consisting of fly ash and bottom ash
with d50 as 6.4 μm and 144 μm Respectively at a fixed blend Ratio (weight Ratio of fly ash to bottom ash) of 4:1. This was attRibuted
to the packing effect and was coRRelated to the Ratio of suRface to suRface sepaRation foR the coaRse bottom ash paRticles,
β, to the aveRage fly ash paRticle size, d50-f, to achieve higheR solids concentRation. The Rheological behaviouR of the ash
sluRRy samples weRe R=880000>DescRibed by non-Newtonian poweR law moR=880000>Del in the Range of solids concentRation studied. Also a substantial
Reduction in viscosity was obseRved foR the same composition of mixtuRe sluRRy sample which was attRibuted to the
poly-dispeRsive chaRacteRistics of the ash paRticles. It was indicated that the sluRRy viscosity was veRy much influenced by paRticle
size Ratio (λ = dlaRge/dsmall)
and volume fRaction of solids. The study Revels that the blending of fly ash and bottom ash at
a contRolled PSD may be employed foR pRepaRation of high concentRation ash mixtuRe sluRRy foR pipeline tRanspoRt.
► Cite this publication as follows:
Senapati PK, Mishra BK, Sahu A, Kumar V: Effective composition of high concentration fly ash-bottom ash mixture slurry for efficient disposal through pipelines, Appl. Rheol. 21 (2011) 23480.
► Cite this publication as follows:
Brummer R: 6th DGK Workshop Rheology of Cosmetic Emulsions. 25 Years of Rheology at Beiersdorf, Appl. Rheol. 21 (2011) 126.
The Rheological paRameteRs (elastic modules and the yield stRess) of binaRy mixtuRes of highly concentRated emulsions with
diffeRent dRoplet sizes can be seveRal times loweR than additive values in a ceRtain Range of concentRation. This is Related to
the pRopeR packing of small dRoplets between laRgeR ones without compRession of dRoplets. While the yield stRess is pRactically
absent foR these uncompRessed dRoplets, the RatheR high stoRage modulus R=880000>DemonstRates the significance of inteRdRoplet
inteRaction in this system.
► Cite this publication as follows:
Foudazi R, Masalova I, Malkin A: The rheology of binary mixtures of highly concentrated emulsions, Appl. Rheol. 21 (2011) 25326.
In this papeR, the Role of extensional viscosity in diffeRent papeR coating pRocesses was evaluated. NumeRical moR=880000>Dels foR the
vaRious coating application pRocesses (blaR=880000>De coating, film coating, and cuRtain coating) weRe constRucted to calculate the
extensional Rate. DiffeRent Rheological methods weRe employed to measuRe extensional viscosity veRsus extensional Rate foR
moR=880000>Del coating colouR systems. Pilot coateR tRials weRe caRRied out to study the peRfoRmance of each moR=880000>Del coating colouR in
cuRtain, blaR=880000>De and film coating. It was R=880000>DemonstRated that extensional viscosity of moR=880000>Del coating colouRs R=880000>Depends on the Rate
of extension, and colouRs can be extension thickening oR extension thinning.With the numeRical calculation Results of extension
Rate in coating application pRocesses, the extensional viscosity test Results of moR=880000>Del coating colouRs weRe matched to
theiR peRfoRmance in pilot coateR expeRiments. It was shown that incReasing the extensional viscosity measuRed at the appRopRiate
extension Rate that exists in blaR=880000>De oR Rod meteRing incReased blaR=880000>De oR Rod load. Misting in film coating was Reduced by
low extensional viscosity measuRed at the appRopRiate extension Rate. CRateRing in cuRtain coating was Reduced by incReasing
extensional viscosity measuRed at the appRopRiate extension Rate. It was fuRtheR concluR=880000>Ded that the extensional viscosity can
be used to pRedict the coating peRfoRmance only if it is measuRed at the pRevailing extensional Rate of the specific coating
pRocess speed.
► Cite this publication as follows:
Yang A, Salminen P, Vervoort S, Endres I, Bachmann H: Role of Extensional Viscosity in Paper Coating, Appl. Rheol. 21 (2011) 23607.
This papeR pResents an expeRimental facility that allows simultaneous viscosimetRic and PaRticle Image VelocimetRy measuRements
on concentRated suspensions in a wiR=880000>De-gap Couette RheometeR. The expeRimental pRoceduRe is R=880000>Detailed: the optical
chaRacteRistics of the inR=880000>Dex-matched suspension aRe caRefully studied, the bottom end effect on both the viscosimetRic measuRements
and the RecoRR=880000>Ded velocity pRofiles aRe analysed. FiRst the expeRimental pRoceduRe is tested on a Newtonian fluid
whose viscosity is known. The spatial and time Resolutions of ouR R=880000>Device aRe shown to be 200 μm and 100 ms. The pRecision
of the local viscosity measuRement is evaluated to betteR than 4 %. Then we show that the R=880000>Device can be used to chaRacteRize
the Rheological behaviouR of a 47 %-concentRated suspension of 30 μm spheRes. AccoRding to the paRticles laRge size, the
BRownian motion can be neglected. HoweveR, colloidal inteRaction aRe still noticeable.
► Cite this publication as follows:
Blanc F, Peters F, Lemaire E: Particle Image Velocimetry in concentrated suspensions : Application to local rheometry, Appl. Rheol. 21 (2011) 23735.
The effects of paRticle concentRation, paRticle size and tempeRatuRe on the sheaR Rheology of suspensions of silica nanopaRticles
aRe studied. SteRically oR electRostatically stabilized silica nanopaRticle dispeRsions with sizes Ranging fRom 5 - 75 nm and
paRticle volume fRactions Ranging fRom 0.22 - 25 % exhibited a constant viscosity within the sheaR Rate Range of 1 - 200 s-1.
TheRe is a non-lineaR Relationship between the concentRation and the viscosity of these dispeRsions that R=880000>Depends on the Radii
and suRface eneRgy of these nanopaRticles.We pRopose an effective maximum packing fRaction moR=880000>Del based on the concept
of an effective paRticle Radius, which takes into account the thickness of the electRical double layeR and the suRface coating
mateRial. The viscosities of all the dispeRsions collapse onto a univeRsal cuRve as a function of the volume fRaction noRmalized
by the effective maximum packing fRaction.
► Cite this publication as follows:
Metin C, Bonnecaze R, Nguyen Q: Shear Rheology of Silica Nanoparticle Dispersions, Appl. Rheol. 21 (2011) 13146.
This papeR evaluates the use of lightweight aggRegates (LWA), namely peRlite (PER) and veRmiculite (VER) in cement moRtaRs.
The woRkability of moRtaRs was R=880000>Defined in RheometeR and flow table tests. ThRee distinct LWA levels weRe adR=880000>Ded (0 - 3, 4.5 - 7,
and 9 - 10.5 wt%) RequiRing the use of distinct wateR/solids (W/S) Ratios (0.18, 0.265 and 0.35, Respectively). In oRR=880000>DeR to evaluate
the peRfoRmance of such foRmulations in the haRR=880000>Dened state, the flexuRal and compRessive stRength afteR 28 days cuRing
was also measuRed. In geneRal, LWA caused a high vaRiation on the yield stRess and spRead on table, being the yield stRess the
best Rheological paRameteR to be Related with the flow table. PER exeRts a stRong impact on initial yield stRess, while the effect
of VER is stRongeR foR longeR Rheology testing peRiods. The compRessive stRength Ranged fRom 12.3 MPa (0 % LWA) to 2.77 MPa
(PER) and 2.39 MPa (VER).
► Cite this publication as follows:
Senff L, Hotza D, Labrincha JA: Effect of lightweight aggregates addition on the rheological properties and the hardened state of mortars, Appl. Rheol. 21 (2011) 13668.
► Cite this publication as follows:
Rheological Societies: Society's Site Mar 2011 - Aug 2011, Appl. Rheol. 21 (2011) 53.
► Cite this publication as follows:
Fester V: Meeting of the Southern African Society of Rheology: SASOR 2010, Appl. Rheol. 21 (2011) 47.
► Cite this publication as follows:
Kubyshkina G: The 7th International Conference on Mechanics of Time-Dependent Materials, Appl. Rheol. 21 (2011) 48.
► Cite this publication as follows:
Seyfert S, Uhl A: Characterization of Nano- and Microdispersions (Berlin, 2010), Appl. Rheol. 20 (2010) 377.
► Cite this publication as follows:
Naccache MF, Thompson RL: V Brazilian Conference on Rheology (BCR 2010), Appl. Rheol. 20 (2010) 376.
This papeR pResents an expeRimental study of the Rheological behaviouR of wateR-in-oil mixtuRes without any additive, up to
10 % of mass wateR concentRation, wheRe the mixtuRe is consiR=880000>DeRed to be a Newtonian fluid. The selected oil is a classical tuRbine
mineRal oil. Viscosity was measuRed foR five tempeRatuRes, Ranging fRom 10 to 80 C, foR dRoplet size below 30 $\mu$m. A light
R=880000>DecRease of viscosity was R=880000>Detected foR wateR concentRations below 0.1 %. FoR concentRations gReateR than 0.2 %, viscosity
incReases with wateR concentRation. MoReoveR, the vaRiation of viscosity with tempeRatuRe shows good coRRelation with both
WaltheR moR=880000>Del and Mac Coull & WaltheR moR=880000>Del. Finally, a new moR=880000>Del of wateR-in-oil mixtuRes viscosity as a function of tempeRatuRe
and concentRation was R=880000>Defined.
► Cite this publication as follows:
Harika E, Jarny S, Monnet P, Bouyer J, Fillon M: Effect of water pollution on rheological properties of lubricating oil, Appl. Rheol. 21 (2011) 12613.
The effect of sheaR viscosity on taste and mouthfeel peRception has been extensively studied; howeveR, the effect of extensional
viscosity on sensoRy peRception has been mostly neglected. This may be impoRtant as in-mouth pRocessing is complex
and pRobably best R=880000>DescRibed as a supeRposition of sheaR and extensional flow chaRacteRistics. Fluid mechanics ReseaRcheRs
inteRested in sepaRating elastic effects fRom viscous effects use BogeR fluids and this appRoach was adopted heRe to investigate
the effect of fluid elasticity on sensoRy peRception. FoR the fiRst time, two food gRaR=880000>De BogeR fluids based on glucose syRup
and aqueous solutions of maltoR=880000>DextRin as solvents and xanthan gum as high moleculaR weight polymeR weRe foRmulated.
The elasticity of the BogeR fluids was chaRacteRised in Rotational sheaR RheometRy, in a filament bReak-up R=880000>Device and in micRocontRaction
flow. Saltiness peRception and mouthfeel of the BogeR fluids and samples coRResponding to the Respective solvent
weR