STERIC EFFECTS IN ELECTROLYTES - A MODIFIED POISSON-BOLTZMANN EQUATION

Authors
BORUKHOV I ANDELMAN D ORLAND H
Citation
I. Borukhov et al., STERIC EFFECTS IN ELECTROLYTES - A MODIFIED POISSON-BOLTZMANN EQUATION, Physical review letters, 79(3), 1997, pp. 435-438
Citations number
22
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
79
Issue
3
Year of publication
1997
Pages
435 - 438
Database
ISI
SICI code
0031-9007(1997)79:3<435:SEIE-A>2.0.ZU;2-G
Abstract
The adsorption of large ions from solution to a charged surface is inv estigated theoretically. A generalized Poisson-Boltzmann equation whic h takes into account the finite size of the ions is presented. We obta in analytical expressions for the electrostatic potential and ion conc entrations 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.