Effective interactions and phase behaviour for a model clay suspension in an electrolyte

Details Effective interactions and phase behaviour for a model clay suspension in an electrolyte Effective interactions and phase behaviour for a model clay suspension in an electrolyte

2002-07-02

arxiv.org/abs/cond-mat/0207075v1

J. Phys.: Condens. Matter 14, 9339 (2002)

Physics

Condensed Matter

Soft Condensed Matter

LaTeX, 12 pages, 11 figures

Scientific paper

10.1088/0953-8984/14/40/322

Since the early observation of nematic phases of disc-like clay colloids by Langmuir in 1938, the phase behaviour of such systems has resisted theoretical understanding. The main reason is that there is no satisfactory generalization for charged discs of the isotropic DLVO potential describing the effective interactions between a pair of spherical colloids in an electrolyte. In this contribution, we show how to construct such a pair potential, incorporating approximately both the non-linear effects of counter-ion condensation (charge renormalization) and the anisotropy of the charged platelets. The consequences on the phase behaviour of Laponite dispersions (thin discs of 30 nm diameter and 1 nm thickness) are discussed, and investigation into the mesostructure via Monte Carlo simulations are presented.

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