Electrical double layer interactions between dissimilar oxide surfaces with charge regulation and Stern-Grahame layers.
Models of surfaces with intrinsic ionisable amphoteric surface sites governed by the dissociation of acid-base potential determining ion species together with the capacity for the adsorption of anion and cations of the supporting electrolyte are required to describe both the results of electrokinetic and titration measurements of inorganic oxides. The Gouy-Chapman-Stern-Grahame (CGSG) model is one such model that has been widely used in the literature. The electrical double layer interaction between two dissimilar CGSG surfaces has been studied by Usui recently [S. Usui, J. Colloid Interface Sci. 280 (2004) 113] where erroneous discontinuities in the slope of the pressure-separation relation were observed. We revisit this calculation and provide a simple general methodology to analyse the electrical double layer interaction between dissimilar ionisable surfaces with ion adsorption.
Chan
Derek Y C
DY
Department of Mathematics and Statistics, University of Melbourne, Victoria 3010, Australia. d.chan@unimelb.edu.au
Healy
Thomas W
TW
Supasiti
Tharatorn
T
Usui
S
S