Applied Rheology: Publications

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Alex Ya Malkin, F.A. Kulikov-Kostyushko
IV International Conference on Colloid Chemistry and Physicochemical Mechanics

Appl. Rheol. 23:4 (2013) 240-241

Cite this publication as follows:
Malkin AY, Kulikov-Kostyushko F: IV International Conference on Colloid Chemistry and Physicochemical Mechanics, Appl. Rheol. 23 (2013) 240.

Steve Goodyer
Advances in Non-Newtonian Fluid Mechanics (INFFM Annual Conference 2013)

Appl. Rheol. 23:4 (2013) 236-239

Cite this publication as follows:
Goodyer S: Advances in Non-Newtonian Fluid Mechanics (INFFM Annual Conference 2013), Appl. Rheol. 23 (2013) 236.

Delegates of the national rheological societies
Society's Site Sep 2013 - Feb 2014

Appl. Rheol. 23:4 (2013) 242-248

Cite this publication as follows:
Rheological Societies: Society's Site Sep 2013 - Feb 2014, Appl. Rheol. 23 (2013) 242.

Patrick D. Anderson, Peter Van Puyvelde
8th Annual European Rheology Conference (ERC 2013)

Appl. Rheol. 23:4 (2013) 235-236

Cite this publication as follows:
Anderson PD, VanPuyvelde P: 8th Annual European Rheology Conference (ERC 2013), Appl. Rheol. 23 (2013) 235.

M. Guettari, I. Ben Naceur, G. Kassab, A. Ponton, T. Tajouri
Temperature and concentration induced complex behavior in ternary microemulsion

Appl. Rheol. 23:4 (2013) 44966 (7 pages)

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 dependent on the micellar concentration. For Wo < Woc, the solutions behaved as simple fluids and the temperature dependence of viscosity was described by an Arrhenius law. The total activation energy was found to be dependent on W with a maximum for Wo = 5. A correlation between the microscopic structure of the reverse micelles and the total activation energy was proposed. However, a complex fluid behavior was observed for Wo > Woc, where the viscosity increased with temperature. For some values of Wo, the viscosity reached a maximum, which could be explained by attractive interdroplet interactions and formation of droplet clusters.

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.

Hugo Faria, F. M. Andrade Pires, A. Torres Marques
Identification of the Combined Rheology of Mixtures of Epoxy Resins with Different Initial Curing States

Appl. Rheol. 23:4 (2013) 42413 (8 pages)

A commercial epoxy resin system was tested under 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 degrees of cure, usually employed to 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.

A.C.K. Sato, F.A. Perrechil, R.L. Cunha
Rheological behavior of suspensions dispersed in non-Newtonian matrix

Appl. Rheol. 23:4 (2013) 45397 (10 pages)

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 added 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 developed for suspensions in Newtonian fluids, Krieger-Dougherty and Eilers models 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 deformation rheological measurements showed that glycerin-containing matrices were more independent on frequency as compared to suspensions of aqueous xanthan solutions. Results showed that, besides particles characteristics, the rheological properties of the suspending matrix are crucial for 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.

J. David, P. Filip, A.A. Kharlamov
Back extrusion of Vocadlo-type fluids

Appl. Rheol. 23:4 (2013) 45366 (8 pages)

Back extrusion represents one of the cheapest experimental methods to 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 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 determining individual rheological parameters appearing in the Vocadlo model (sometimes called the Robertson-Stiff model) - yield stress, consistency parameter and flow behaviour index.

Cite this publication as follows:
David J, Filip P, Kharlamov A: Back extrusion of Vocadlo-type fluids, Appl. Rheol. 23 (2013) 45366.


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