The effect of geometrical confinement on the interaction between charged colloidal suspensions

Details The effect of geometrical confinement on the interaction between charged colloidal suspensions The effect of geometrical confinement on the interaction between charged colloidal suspensions

1999-04-29

arxiv.org/abs/cond-mat/9904425v2

Physics

Condensed Matter

Soft Condensed Matter

27 pages of Latex text, 16 Postscript figures, e-mail address of author corrected

Scientific paper

10.1103/PhysRevE.60.3199

The effective interaction between charged colloidal particles confined between two planar like-charged walls is investigated using computer simulations of the primitive model describing asymmetric electrolytes. In detail, we calculate the effective force acting onto a single macroion and onto a macroion pair in the presence of slit-like confinement. For moderate Coulomb coupling, we find that this force is repulsive. Under strong coupling conditions, however, the sign of the force depends on the distance to the plates and on the interparticle distance. In particular, the particle-plate interaction becomes strongly attractive for small distances which may explain the occurrence of colloidal crystalline layers near the plates observed in recent experiments.

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