Abstract
A method is proposed that combines the Stern theory of the double layer with the theory of interaction of colloidal particles developed by the author in earlier papers. Our theory avoids the difficult problem of integrating the force between the particles with respect to the distances. As an illustration, the case of two parallel plates and small surface potentials is treated. In the final formula for the mutual free energy of two plates, there are three terms, one of which has the same form as that obtained by Verwey and Overbeek and can be derived from the Lippmann equation. The two additional terms, which are examined in some detail, are by no means small compared with the expression of these authors.
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