Abstract
A simple method is given for calculating the potential energy of the diffuse double-layer interaction between two identical spherical colloidal particles in a symmetrical electrolyte solution with the help of Derjaguin's approximation. This method uses accurate analytic expressions for the corresponding interaction energy between two parallel similar plates obtained previously (Colloids Surf. A Physicochem. Eng. Asp.146, 213 (1999); J. Colloid Interface Sci.212, 130 (1999)). Agreement with numerical data provided by Honig and Mul (J. Colloid Interface Sci.36, 258 (1971)) is excellent particularly for small particle separations.
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