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Angus Paterson
International Seminar on Paste and Thickened Tailings (Cape Town, South Africa)

Appl. Rheol. 14:3 (2004) 151-153

Cite this publication as follows:
Paterson A: International Seminar on Paste and Thickened Tailings (Cape Town, South Africa), Appl. Rheol. 14 (2004) 151.

M. Greim, W. Kusterle
Rheological Measurement of Building Materials (Regensburg, Germany)

Appl. Rheol. 14:3 (2004) 148-150

Cite this publication as follows:
Greim M, Kusterle W: Rheological Measurement of Building Materials (Regensburg, Germany), Appl. Rheol. 14 (2004) 148.

A.Martinez-Ruvalcaba, E. Chornet, D. Rodrigue
Dynamic rheological properties of concentrated Chitosan solutions

Appl. Rheol. 14:3 (2004) 140-147

A detailed analysis of the dynamic flow properties of chitosan in solution at different temperatures (25 - 45 C), chitosan concentration (0.5% - 2.0%), solvent type (acetic, lactic, and hydrochloric acid), and ionic strength (0 and 0.2M NaCl) has been undertaken. The storage modulus, G', loss modulus, G'' and complex viscosity, h* have been determined over a wide range of frequencies and the results are presented using master curves. For the conditions studied, at low frequencies chitosan solutions show a constant complex viscosity which decreases as frequency increases. Likewise, storage modulus, G' and loss modulus, G'' increase as frequency increases with G'' being always greater than G' indicating that viscous effects are more important than elastic effects. For modelling the oscillatory-shear results we used the generalized Maxwell model. Two empirical equations were used to correlate the data: Cox-Merz rule for viscosity and Laun's rule for primary normal stress difference. Both relations were found to represent our data for the experimental conditions studied.

Cite this publication as follows:
Martinez-Ruvalcaba A, Chornet E, Rodrigue D: Dynamic rheological properties of concentrated Chitosan solutions, Appl. Rheol. 14 (2004) 140.

Won B. Yoon, Sundaram Gunasekaran, Jae W. Park
Evaluating viscosity of Surimi paste at different moisture contents

Appl. Rheol. 14:3 (2004) 133-139

The steady and dynamic shear viscosity of fish muscle protein paste obtained from Alaska pollock surimi at 95%, 90%, 85%, 80%, and 75% of moisture contents were measured in the temperature range of 5°C to 20°C. To estimate the steady shear viscosity at high shear rate from dynamic shear viscosity, the modified Cox-Merz rule was applied by introducing a frequency shift factor. The concentration dependence of zero-shear viscosity showed power-law dependence with an exponent of 3.5, and the universal behavior of viscosity at different protein concentrations was observed by a introducing reduced variables. The Carreau model was applied to describe the shear- thinning behavior of the surimi paste, and the model parameters estimated empirically showed moisture content dependence. The viscous flow behavior was independent of temperature (5°C to 20°C), and addition of starch decreased the flow index and viscosity of the paste, compared to the pure surimi paste.

Cite this publication as follows:
Yoon WB, Gunasekaran S, Park JW: Evaluating viscosity of Surimi paste at different moisture contents, Appl. Rheol. 14 (2004) 133.

David Megias-Alguacil
Characterization of the linear viscoelastic region in suspensions of zirconium oxide: Cohesive energy obtained from the critical parameters

Appl. Rheol. 14:3 (2004) 126-132

The linear viscoelastic regions (L.V.R.) of suspensions of zirconium oxide particles were determined and characterized through the so-called 'critical parameters'. These are the values of shear-stress and strain at the crossover between the linear and the non-linear viscoelastic responses. From these magnitudes, the cohesive energy between the particles is calculated as a function of volume fraction of solids and at different electrolyte concentrations. The oscillatory measurements were carried out using a constant-stress rheometer at a fixed frequency of 1 Hz and increasing shear-stress. The suspensions cover a volume fraction range between 3% - 25% with electrolyte (sodium chloride) concentrations of 10-1 M, 10-2 M, 10-3 M and 10-5 M. Two different kinds of ZrO2 particles were used: commercially obtained -with no defined geometry- and spheres synthesized by us following the method described by Aiken, Hsu and Matijevic.

Cite this publication as follows:
Megias-Alguacil D: Characterization of the linear viscoelastic region in suspensions of zirconium oxide: Cohesive energy obtained from the critical parameters, Appl. Rheol. 14 (2004) 126.

Walter Richtering
Viscosity (Howard Barnes)

Appl. Rheol. 14:3 (2004) 125

Cite this publication as follows:
Richtering W: Viscosity (Howard Barnes), Appl. Rheol. 14 (2004) 125.


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