Steric effects in electrolytes: A modified Poisson-Boltzmann equation

被引：826
|
作者：
Borukhov, I [1 ]
Andelman, D [1 ]
Orland, H [1 ]
机构：
[1] CTR ETUD SACLAY,SERV PHYS THEOR,F-91191 GIF SUR YVETTE,FRANCE
来源：
PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 03期
关键词：
D O I：
10.1103/PhysRevLett.79.435
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The adsorption of large ions from solution to a charged surface is investigated theoretically. A generalized Poisson-Boltzmann equation which takes into account the finite size of the ions is presented. We obtain analytical expressions for the electrostatic potential and ion concentrations at the surface, leading to a modified Grahame equation. At high surface charge densities the ionic concentration saturates to its maximum value. Our results are in agreement with recent experiments.
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收藏
页码：435 / 438
页数：4
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