(722a) Electric Double Layers: Effect of Asymmetry in Electrolyte Valence on Finite Ion Size Effects, Dielectric Decrement and Ion-Ion Correlations

We study the effect of asymmetry in electrolyte valence (i.e. non z:z electrolyte) on mean field theory of electrical double layers. More specifically, we study the effect of valence asymmetry on finite ion size effects, the dielectric decrement and ion-ion correlations. For a model configuration of an electrolyte near a charged surface, we present analytical and numerical results for potential distribution, electrode charge density, capacitance, and dimensionless salt uptake. We emphasize that the asymmetry in electrolyte valence significantly influence the diffuse-charge relations and prior results reported in literature are readily extended to non z:z electrolytes. We develop scaling relations and invoke physical arguments to examine the relative importance of asymmetry in electrolyte valence on the aforementioned effects. We conclude by providing implications of our findings on diffuse-charge dynamics and other electrokinetic phenomena.