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

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

2011-01-07

arxiv.org/abs/1101.1362v2

Phys. Rev. E 84, 011502 (2011)

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 5 figures

Scientific paper

10.1103/PhysRevE.84.011502

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.

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