J. Phys. IV France
Volume 123, March 2005
Page(s) 337 - 340

J. Phys. IV France 123 (2005) 337-340

DOI: 10.1051/jp4:2005123061

Electrokinetic properties of the fluorinated montmorillonite "rassoul" particles in aqueous medium

A.Khaldoun1, F. González-Caballero2, J.G. López-Durán2, N. Benajiba3 and M.L. Kerkeb3

1  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

Rassoul is clay extracted from Atlas Mountains in North Africa, characterized by its high capacity of adsorption and ionic exchange. The high stability of the rassoul particles suspension is closely linked to their capacity to interact by electrostatic and thermodynamic interactions within the aqueous medium. A fundamental contribution to the energy of interaction between colloidal particles in suspension is electrostatic. The aim of this work is to estimate the variation of the potential $\zeta $ of the aqueous suspension of Rassoul particles as well as the potential zeta of edges and faces. We measured the electrophoretic mobility of the suspension as a function of pH at constant ionic straight of the solution. The zeta potential were estimated by the means of the sample Helmotz Smoluchowski equation [1].

© EDP Sciences 2005