Towards a mean electrostatic potential treatment of an ion-dipole mixture or a dipolar system next to a plane wall

The basic equations are formulated for a mean electrostatic potential treatment of a mixture of charged hard spheres and dipolar hard spheres or solely dipolar hard spheres near a uniformly charged plane wall. The Kirkwood hierarchy of equations are closed using an approximation analogous to that of Loeb for the primitive model electrolyte. A linear form of the ion-dipole theory supports the mean spherical approximation that a damped oscillatory behaviour can occur in the charge density and polarization density which depends crucially upon the solvent molecules. The potential theory also appears to be useful technique for treating a pure dipolar fluid.