On the surface potentials of unimolecular films. Part IV.—The effect of the underlying solution and transition phenomena in the film

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Abstract
In previous papers of this series (1) it was shown that the method of surface potentials could be developed to give quantitative measurements of the physico-chemical properties of unimolecular films at an air liquid interface. Several problems of fundamental importance arise when a closer investigation is made of the true meaning of the phrase “surface potential of a unimolecular film.”