Abstract
A model is described for the potential distribution across a charged membrane surface. This model assumes that membrane-fixed charges are distributed through a surface layer of non-zero thickness d and that electrolyte ions can penetrate the surface layer. Along the lines of this model, we discuss various interfacial electric phenomena-potential distribution across a membrane, electrophoresis, and electrostatic interaction of membranes-in comparsion with results predicted from the conventional model assuming d=0. The Donnan potential is shown to play a fundamental role in the electric behavior of membranes.
