Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science

Adsorption at solid-liquid interfaces. II. Models of the electrical double layer at the oxide-solution interface

HJL Wright and RJ Hunter

Australian Journal of Chemistry 26(6) 1191 - 1206
Published: 1973


An extension has been made to Gouy-Stern-Grahame models of the double layer on mineral oxide surfaces.1 In this work and an earlier paper,2 the Stern isotherm is used for adsorption of p.d. ions at the surface. This is essentially an inversion of the modified Nernst equation given by Levine and Smith.3 The development of the surface charge and potential is considered by two different but related methods. Comprehensive calculations show that the zeta potential of oxide systems may be reasonably simulated with such models but the calculated surface charge is much less than that found experimentally. It is suggested that a model in which this surface charge is incorporated into a gel layer may be more appropriate.

© CSIRO 1973

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