Evidence for a Rigid Multilayer at a Solid-Liquid Interface

The assumption of an immobile hydrous multilayer at a wall of fixed potential was used in deriving equations relating zeta potentials, concentrations of univalent salt solution, wall potential, and thickness of the immobile layer. Calculations were made using data taken from published papers of various experimenters. Values of 8A to 63A were obtained for the thickness of the immobile layer. The values of wall potential and film thickness were considered sufficiently consistent for each set of data to justify the original assumption.