Abstract
A Poisson-Boltzmann equation (PBE) is derived with hydration forces acting on the ions in an interface. The equation is solved numerically for different concentrations of NaF and with different surface potentials. The main differences from the Gouy—Chapman theory are the following: lowering of the surface ion concentrations; breaking of the linear connection between the surface charge and the surface electrical field; bending of the differential capacity curves of the double layer; separating in adsorptions of the ion species of the univalent polyelectrolyte. It is shown that for a mixture of the alkali metal chlorides the adsorption increases in the order Li < Na < K < Rb <Cs.
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