IMAGE FORCES INFLUENCING CAPACITANCE AND INTERACTION OF DOUBLE-LAYERS

We assess modifications of the capacitance and interaction of planar double layers due to image forces. These forces come from the polarization induced at the salt solution/electrode interface by the ions in the aqueous phase. For both metallic and low dielectric electrodes, image forces have a small (<10%) effect both on the charge density necessary to maintain a given surface potential and on the pressure acting between a pair of electrodes immersed in a salt solution.