Hydration interactions: aqueous solvent effects in electric double layers
摘要
A model for ionic solutions with an attractive short-range pair interaction between the ions is presented. The short-range interaction is accounted for by adding a quadratic non-local term to the Poisson-Boltzmann free energy. The model is used to study solvent effects in a planar electric double layer. The counter-ion density is found to increase near the charged surface, as compared with the Poisson-Boltzmann theory, and to decrease at larger distances. The ion density profile is studied analytically in the case where the ion distribution near the plate is dominated only by counter-ions. Further away from the plate the density distribution can be described using a Poisson-Boltzmann theory with an effective surface charge that is smaller than the actual one.
引用
@article{arxiv.cond-mat/0004098,
title = {Hydration interactions: aqueous solvent effects in electric double layers},
author = {Yoram Burak and David Andelman},
journal= {arXiv preprint arXiv:cond-mat/0004098},
year = {2009}
}
备注
11 Figures in 13 files + LaTex file. 20 pages. Accepted to Phys. Rev. E. Corrected typos and references