Screened electrostatic interactions between clay platelets

Details Screened electrostatic interactions between clay platelets Screened electrostatic interactions between clay platelets

2000-04-20

arxiv.org/abs/cond-mat/0004358v1

Physics

Condensed Matter

Soft Condensed Matter

23 pages, 10 figures, created with Revtex. To appear in Molecular Physics

Scientific paper

10.1080/002689700417493

An effective pair potential for systems of uniformly charged lamellar colloids in the presence of an electrolytic solution of microscopic co- and counterions is derived. The charge distribution on the discs is expressed as a collection of multipole moments, and the tensors which determine the interactions between these multipoles are derived from a screened Coulomb potential. Unlike previous studies of such systems, the interaction energy may now be expressed for discs at arbitrary mutual orientation. The potential is shown to be exactly equivalent to the use of linearized Poisson-Boltzmann theory.

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