ABSTRACT The electrostatic interactions between two planar double layers described by the classical Poisson-Boltzmann equation are discussed. Then, the approximate models for calculating interactions of flat plate’s interfaces are exposed, specially, the application of the extended Langmuir’ method to high surface potential or large values of the valency of the ions is first discussed in some detail. The results of the approximate models are compared with the exact numerical solution for two dissimilar plates.
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