Binding of oppositely charged membranes and membrane reorganization

We consider the electrostatic interaction between two rigid membranes, with different surface charge densities of opposite sign, across an aqueous sol ution without added salt. Exact solutions to the nonlinear Poisson-Boltzman n equation are obtained and their physical meaning discussed. We also calcu late the electrostatic contribution to the free energy and discuss the reno rmalization of the area per head group of the charged lipids arising from t he Coulomb interaction.