Summary
An equation is derived on the basis of the Gouy-Chapman theory relating the double layer potential, surface charge density and electrolyte concentration in a liquid film stabilised by an ionic surfactant. The validity of the constant potential model for a soap film is shown to be inconsistent with known properties of films, monolayers and micelles, and it is suggested that a constant surface charge density model is more realistic.
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Jones, M.N. The relationship between surface charge density and double layer potential in soap films. Kolloid-Z.u.Z.Polymere 230, 236–240 (1969). https://doi.org/10.1007/BF01521986
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DOI: https://doi.org/10.1007/BF01521986