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Paper   IPM / Physic / 12021
School of Physics
  Title:   Dressed Counterions: Polyvalent and Monovalent Ions at Charged Dielectric Interfaces
  Author(s): 
1.  M. Kanduc
2.  A. Naji
3.  J. Forsman
4.  R. Podgornik
  Status:   Published
  Journal: Phys. Rev. E
  Vol.:  84
  Year:  2011
  Pages:   011502
  Supported by:  IPM
  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 generalized 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. Limitations and applicability of this theory are examined by comparing the results with simulations.

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