The Poisson-Boltzmann Theory for Two Parallel Uniformly Charged Plates

Details The Poisson-Boltzmann Theory for Two Parallel Uniformly Charged Plates The Poisson-Boltzmann Theory for Two Parallel Uniformly Charged Plates

2010-10-24

arxiv.org/abs/1010.4943v1

Physics

Classical Physics

17 pages, 9 eps figures

Scientific paper

We solve the nonlinear Poisson-Boltzmann equation for two parallel and likely charged plates both inside a symmetric elecrolyte, and inside a 2 : 1 asymmetric electrolyte, in terms of Weierstrass elliptic functions. From these solutions we derive the functional relation between the surface charge density, the plate separation, and the pressure between plates. For the one plate problem, we obtain exact expressions for the electrostatic potential and for the renormalized surface charge density, both in symmetric and in asymmetric electrolytes. For the two plate problems, we obtain new exact asymptotic results in various regimes.

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