General Physiology and Biophysics Vol.30, No.2, p.130

General Physiology and Biophysics Vol.30, No.2, p.130–137, 2011

Founded: 1982
ISSN 1338-4325 (online)
ISSN 0231-5882 (print)
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General Physiology and Biophysics Vol.30, No.2, p.130–137, 2011
Title: Langevin Poisson-Boltzmann equation: point-like ions and water dipoles near a charged surface
Author: Ekaterina Gongadze, Ursula van Rienen, Veronika Kralj-Iglič, Aleš Iglič

Abstract: Water ordering near a charged membrane surface is important for many biological processes such as binding of ligands to a membrane or transport of ions across it. In this work, the mean-field Poisson-Boltzmann theory for point-like ions, describing an electrolyte solution in contact with a planar charged surface, is modified by including the orientational ordering of water. Water molecules are considered as Langevin dipoles, while the number density of water is assumed to be constant everywhere in the electrolyte solution. It is shown that the dielectric permittivity of an electrolyte close to a charged surface is decreased due to the increased orientational ordering of water dipoles. The dielectric permittivity close to the charged surface is additionally decreased due to the finite size of ions and dipoles.

Keywords: Electric double layer — Langevin Poisson-Boltzmann equation — Dielectric permittivity — Orientational ordering of water — Langevin-Bikerman equation

Year: 2011, Volume: 30, Issue: 2	Page From: 130, Page To: 137
doi:10.4149/gpb_2011_02_130
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