Steric Effects in Electrolytes: A Modified Poisson-Boltzmann Equation

Details Steric Effects in Electrolytes: A Modified Poisson-Boltzmann Equation Steric Effects in Electrolytes: A Modified Poisson-Boltzmann Equation

1998-03-21

arxiv.org/abs/cond-mat/9803258v1

Phys. Rev. Lett. 79, 435 (1997)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.79.435

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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