Title: Ion size effects in a primitive level model of the diffuse double layer
Authors: W.R.Fawcett, T.G.Smagala (Department of Chemistry University of California Davis, CA 95616)

An analytical expression is developed for the potential drop across the diffuse layer Φ^d in terms of a cubic polynomial in the corresponding estimate in the Gouy-Chapman approximation φ^d_GC. The coefficients of this polynomial are defined in terms of the hard sphere volume fraction η and the MSA dimensionless reciprocal distance parameter Γ. The resulting expression is shown to describe the Monte-Carlo estimates of Φ^d obtained in a primitive level simulation of diffuse layer properties.

Key words: double layer theory, diffuse double layer, ion size effects
PACS: 05.20.Jj, 05.10.Zn