Excluded volume effect and orientational ordering near charged surface in solution of ions and Langevin dipoles
Ales Iglic1, Ekaterina Gongadze, Klemen Bohinc
1Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana, Trzaska 25, SI-1000 Ljubljana, Slovenia. ales.iglic@fe.uni-lj.si
Abstract:
The influence of a finite volume of ions and orientational ordering of water Langevin dipoles on the dielectric permittivity profile in the vicinity of charged surface is studied theoretically via a numerical solution of the modified Poisson-Boltzmann equation. It is shown that the dielectric permittivity profile close to the charged surface is mainly determined by two mechanisms; specifically, the depletion of dipoles at the charged surface due to accumulated counterions and the increased orientational ordering of the water dipoles.
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