Dressed Counterions: Poly- and monovalent ions at charged dielectric interfaces

Abstract

We investigate the ion distribution and overcharging at charged interfaces with dielectric inhomogeneities in the presence of asymmetric electrolytes containing polyvalent and monovalent ions. We formulate an effective "dressed counterion" approach by integrating out the monovalent salt degrees of freedom and show that it agrees with results of explicit Monte-Carlo simulations. We then apply the dressed counterion approach within the framework of the strong-coupling theory, valid for polyvalent ions at low concentrations, which enables an analytical description for salt effects as well as dielectric inhomogeneities in the limit of strong Coulomb interactions on a systematic level. Limitations and applicability of this theory are examined by comparing the results with simulations.

9 pages, 5 figures

References in corpus (4)

• Statics and Dynamics of Strongly Charged Soft Matter
• Dielectric decrement as a source of ion specific effects
• Strong Coupling Electrostatics in the Presence of Dielectric Inhomogeneities
• Simulation of charge reversal in salty environments: Giant overcharging?

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