Colloidal Behaviour Of Materials With Ionizable Group Surfaces

Abstract

Classic DLVO descriptions of coagulation are cast in terms of mean interfacial potentials developed in self-consistent physical terms by a general surface charge. An alternative approach is to begin by identifying an array of well defined, chemically distinguishable surface groups. The charging of such groups is controlled through equilibrium constants by bulk aqueous solution parameters. Subsequent definition of the mean potential of the array of ionizable groups is then a first approximation towards the more difficult task of defining local potentials. Nevertheless, the combination of specific group charge plus a mean potential allows new approaches to be made towards understanding interaction of biological surfaces and model (eg, latex)colloids, particularly in concentrated suspensions. © 1980, Walter de Gruyter. All rights reserved.