The static capacitor method of measuring the effective dipole moment of surfactant molecules

Abstract

On the basis of a general theory the electrical phenomena above a dipolar monolayer on a water surface are described. This theory leads to an equation that permits discussion of the “ionizing gap method” as well as of the “vibrating plate method.” Both methods are commonly used for measuring the effective dipole moment of surfactant molecules. Using the same equation, a new method is described, which is referred to as the “static capacitor method.” Its limitations and possibilities are briefly discussed.