THE APPLICATION OF THE MPB4 THEORY TO THE INTERFACE BETWEEN 2 IMMISCIBLE ELECTROLYTE-SOLUTIONS .1. THE DIFFERENTIAL CAPACITANCE OF THE WATER NITROBENZENE INTERFACE

We use the MPB4 theory to calculate the differential capacitance of th e interface between NaBr + water and tetrabutylammoniumtetraphenyl bor ate (TBATPB) + nitrobenzene at electrolyte concentrations of 0.01 M, 0 .02 M and 0.05 M. In addition to the effects of ion size and image for ce, we consider the influence of the electrolyte concentration, the su rface charge density and the solvent effect on the potential distribut ion of the inner layer. The influence can be ascribed to ionic penetra tion into the opposite solution and ion-ion correlations across the in terface. Our results are in better agreement with the experimental val ues than are other theoretical values. We conclude that the MPB4 theor y-describes the structure of the water nitrobenzene interface well pro vided that the influence of the electrolyte concentration, the surface charge density and the solvent effect on the inner-layer potential di stribution are included in the calculation.