Abstract
Abstract We have employed a variational method for the solution of the three point extension hypernetted chain/mean spherical approximation (HNC/MSA) equations for the distribution of ions between two charged plates of infinite extent, a system of great interest in colloid physics. We have previously shown, for the case of a single charged plate, that this method of solution has several features which make it convenient for use in applications. The calculated electrolyte structure within this model slit pore can be used to find the net pressure between the two plates. Comparisons are made throughout the paper with the classical Verwey-Overbeek theory of interacting electrical double layers. Additionally we will compare our theoretical results with experimental clay swelling pressure data. Finally, some results for hard sphere fluids confined to an uncharged pore are presented.
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