The double-layer of penetrable ions: an alternative route to charge reversal

Abstract

We investigate a double-layer of penetrable ions near a charged wall. We find a new mechanism for charge reversal that occurs in the weak-coupling regime and, accordingly, the system is suitable for the mean-field analysis. The penetrability is achieved by smearing-out the ionic charge inside a sphere, so there is no need to introduce non-electrostatic forces and the system in the low coupling limit can be described by a modified version of the Poisson-Boltzmann equation. The predictions of the theory are compared with the Monte Carlo simulations.

References in corpus (3)

• A close look into the excluded volume effects within a double layer
• Ultrasoft primitive model of polyionic solutions: structure, aggregation, and dynamics
• Colloidal charge reversal: Dependence on the ionic size and the electrolyte concentration

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