[Interaction of membranes with constant surface charge]

A system of two plane charged bilayers in electrolyte solution is considered. Equilibrium criteria of such system under the effect of van der Waals attractive forces and electrostatic repulsive force were obtained, as well as aggregation criteria (it is assumed that surface charge density on the membrane is constant). Relationships between the membrane inner field, surface potential differences, as well as resulting forces and energies and the distances between the membranes were analysed.