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Effect of pH on the rheological behavior of pure and interstratified smectite clays

Published online by Cambridge University Press:  01 January 2024

Saoussen Laribi*
Affiliation:
Laboratoire de Mécanique, CNRS UMR 8579, Ecole Centrale Paris, Châtenay-Malabry, France Institut National de la Recherche Scientifique et Technique, Hammam-Lif, Tunisia
Jean-Marie Fleureau
Affiliation:
Laboratoire de Mécanique, CNRS UMR 8579, Ecole Centrale Paris, Châtenay-Malabry, France
Jean-Louis Grossiord
Affiliation:
Laboratoire de Physique Pharmaceutique, CNRS UMR 8612, Faculté de Pharmacie, Université Paris Sud, Châtenay-Malabry, France
Nejia Kbir-Ariguib
Affiliation:
Institut National de la Recherche Scientifique et Technique, Hammam-Lif, Tunisia
*
*E-mail address of corresponding author: saoussen.laribi@ecp.fr

Abstract

The effects of pH and ionic strength on the rheological behavior of aqueous suspensions of both crude and purified Wyoming bentonite and natural interstratified illite-smectite from Tunisia were investigated. Flow tests were performed on the four clay suspensions at a 10% clay concentration at different pH values. They showed that the rheological properties were highly sensitive to pH and the nature of the clay. The evolution of the yield stress as a function of pH is characterized by the presence of maxima and minima attributed to changes in the mode of association of the particles. The effect of pH on the behavior of clay suspended in NaCl solutions was also studied. The results show that the presence of NaCl has very little effect on the pH and yield stress values of the four materials.

Type
Research Article
Copyright
Copyright © 2006, The Clay Minerals Society

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