Wall-Mediated Forces between Like-Charged Bodies in an Electrolyte

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Abstract
The Poisson-Boltzmann model of colloidal bodies in electrolyte is the basis of a recent numerical calculation predicting attraction between two colloidal spheres confined in a cylinder. The present study formulates an analytical proof that this model cannot predict attraction. Our exact result, not contingent upon approximations, suggests that a new model is needed to explain experimental results.