| Issue |
J. Phys. IV France
Volume 123, March 2005
|
|
|---|---|---|
| Page(s) | 341 - 344 | |
| DOI | https://doi.org/10.1051/jp4:2005123062 | |
J. Phys. IV France 123 (2005) 341-344
DOI: 10.1051/jp4:2005123062
Rheological behaviour of the condensed suspension of fluorinated montmorillonite "rassoul" particles in aqueous medium
A. Khaldoun1, F. González-Caballero2, J.G. López-Durán2, N. Mahrach3 and M.L. Kerkeb31 Van der Waals-Zeeman Institute, University of Amsterdam Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands
2 Department of Applied Physics, Faculty of Sciences, University of Granada, 18071 Granada, Spain
3 Department of Physics, Faculty of Sciences, Abdelmalek Essaadi University, 93000 Tetouan, Morocco
Abstract
In this article, we describe the rheology of a
condensed suspension of FNaMt particles 5w% as a function of pH, at
constant ionic strength. The steady-state viscosimerty measurements showed
that the yield stress increase up to an order of magnitude between pH3 and
pH6, with a much slower rate of increase in the 6 to 9 pH interval.
Concerning the dynamic (oscillatory) measurements, it is found that both the
elastic G' and viscous G" are practically independent of frequency. It is
also demonstrated that G'>G", the difference being larger at basic pH
values. These results suggest the existence of an elastic, coagulated
structure at pH acid, whereas as the pH is decreased such structure is more
relaxed.
© EDP Sciences 2005