title: Langevin Poisson-Boltzmann equation: point-like ions and water dipoles near a charged surface.
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.
authors: Institute of General Electrical Engineering, University of Rostock, Justus-von-Liebig Weg 2, D-18059 Rostock, Germany.
authors: Ekaterina
authors: E
authors: Gongadze
authors: Ursula
authors: U
authors: van Rienen
authors: Veronika
authors: V
authors: Kralj-Iglič
authors: Aleš
authors: A
authors: Iglič