THEORY OF INTERACTION OF DISSIMILAR ELECTRICAL DOUBLE-LAYERS AT EQUILIBRIUM IONIZATION OF THE SURFACE OF COLLOIDAL PARTICLES - LOW SURFACE-POTENTIALS

Based on the linearized Poisson-Boltzmann equation, the problem of the interaction of electrical double layers of dissimilar colloidal parti cles was solved under the assumption that the regime of particle surfa ce charging is in equilibrium. There are three types of charging of th e particle surface by electrolyte ions whose concentration is in the H enry region: (a) adsorption of cations (anions) on an initially unchar ged surface; (b) ion adsorption (ion exchange) on initially charged su rface; and (c) ion adsorption (ion exchange) on amphoteric surfaces we re considered. All three cases can be reduced to the last case when th e Nernst surface potentials are different. Analytical expressions for potentials, charge densities of the plates, and the electrostatic comp onent of particle interaction energy were derived as functions of the shortest distance between the particle surfaces and qualitatively stud ied.