Abstract
Improvements in the technique for the determination of the electric potential at the interface between a non‐conducting solid and an aqueous solution of an electrolyte (commonly called the zeta‐potential) have been developed and are described in detail. Zeta‐potentials of vitreous silica capillaries in contact with three dilute solutions of potassium chloride (10−3, 10−4, 10−5N) have been determined. These data have been used for the interpretation of the surface tension data of Jones and Ray by using Langmuir's theory for the thickness of wetting films as a function of the zeta‐potential.

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