Abstract
The consequences of assigning different size Stern layers to the anions and cations within a simple Debye-Hückel theory of the diffuse electrical double layer are examined. Analytic expressions for the mean electrostatic potential and solvation force between two charged surfaces are obtained and found to be in quantitative agreement with a density functional theory of non-uniform electrolytes at medium to low bulk concentrations, especially for surface charges with correspond to preferential adsorption of the smaller ion.
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