Mutual Antagonism in a 1?1 Plus 2?1 Electrolyte Mixture: An Exact Solution of the Poisson-Boltzmann Equation

The stability properties of two charged plate-like parallel colloidal particles immersed in an aqueous solution containing a 1-1 plus 2-1 electrolyte mixture is considered where the first-mentioned ion is the coagulating one. It is found that the relation between the coagulating concentrations of the two binary electrolytes is such as to predict a very weak mutual antagonism, even in the absence of a Stern inner region, when the plate potentials are above 250 mV at 25�C.