Surface-induced layer formation in polyelectrolytes

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Abstract
We analyze, by means of a random phase approximation (RPA) calculation, the conditions under which a mixture of oppositely weakly charged polyelectrolytes can microsegregate in the neighborhood of a charged surface creating a layered structure. A number of stable layers can be formed if the surface is sufficiently strongly charged even at temperatures at which the bulk of the mixture is homogeneous. The wave-length of the induced concentration fluctuation is proportional to 1/f1/2 near the microphase transition, where f is the charge density of the polyelectrolytes.
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