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Influence of the diffuse layer overcharging or undercharging on the stability of charged interfaces: a restricted
1CRMD, CNRS, 1B rue de la Férollerie, 45071 Orléans Cedex 02, France. delville@cnrs-orleans.fr
Abstract:
We have applied a restricted grand canonical Monte Carlo procedure to describe, in the framework of the primitive model, the counterion exchange mechanism between diffuse layers of counterions surrounding segregated charged lamellae. The net charge transfer between the dense and dilute domains is shown to vary as a function of the valence of the neutralizing counterions: undercharging of the dense interlayer is detected in the presence of monovalent counterions and overcharging with divalent counterions. Furthermore, no net reduction of the swelling pressure is detected for monovalent counterions, while a large enhancement of the net interlamellar attraction is found for charged lamellae neutralized by divalent counterions.
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