Applied Rheology: Publications

Appl Rheol online available publications for selected issue

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David Taj, Thierry Savin
International Workshop on Nonequilibrium Thermodynamics (IWNET 2012) and 3rd Lars Onsager Symposium

Appl. Rheol. 22:5 (2012) 274-276

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.

H. Ibrahim Unal, Ozlem Erol
13th International Conference on electrorheological fluids and magnetorheological suspensions (ERMR 2012)

Appl. Rheol. 22:5 (2012) 272-274

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.

Paul Acker, Xavier Chateau, Guillaume Ovarlez, Fabrice Toussaint
Flocculated suspensions: from microstructure to macroscopic behavior

Appl. Rheol. 22:5 (2012) 269-271

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.

Peter Fischer
Polymer Physics - Applications to Molecular Association and Thermoreversible Gelation (F. Tanaka)

Appl. Rheol. 22:5 (2012) 235-235

Cite this publication as follows:
Fischer P: Polymer Physics - Applications to Molecular Association and Thermoreversible Gelation (F. Tanaka), Appl. Rheol. 22 (2012) 235.

Thanunya Saowapark, Pongdhorn Sae-oui, Narongrit Sombatsompop, Chakrit Sirisinha
Storage Instability of Fly Ash Filled Natural Rubber Compounds

Appl. Rheol. 22:5 (2012) 55414 (9 pages)

Generally, fly ashes (FA) could function as either semi-reinforcing or non-reinforcing fillers in polymeric systems, 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 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 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 degradation process of rubber molecules. Such 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 polyacrylamides 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.

Valerie J. Anderson, Gerald H. Meeten
Interpretation of T-bar tool measurements for yield stress materials

Appl. Rheol. 22:5 (2012) 55370 (9 pages)

The T-bar rheometrical tool (Brookfield Engineering Laboratories, Inc.) is a slender 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 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 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 stepdecrease 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.

Edmundo Brito-de la Fuente, Nadege Staudinger-Prevost, Lida A. Quinchia, Concepcion Valencia, Pedro Partal, Jose M. Franco, Crispulo Gallegos
Design of a new spoon-thick consistency oral nutrition supplement using rheological similarity with a swallow barium test feed

Appl. Rheol. 22:5 (2012) 53365 (8 pages)

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 designed for the nutritional support at different stages of dysphagia. However, it is clear that there are significant differences among products designed for the same level or stage of dysphagia. On the other hand, videofluoroscopy has become a key technique for the evaluation of swallowing and, thus, dysphagia. In this study, a new approach for 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 videofluoroscopy studies and, then, matching the viscous flow properties of the RTU ONS product accordingly, by taking into consideration 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.

Imre Balazs
The International Conference on Bio-Based Polymers and Composites 2012

Appl. Rheol. 22:5 (2012) 268-269

Cite this publication as follows:
I Balazs: The International Conference on Bio-Based Polymers and Composites 2012, Appl. Rheol. 22 (2012) 268.


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