Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2000-04-06
Phys. Rev. E. 62, 5296 (2000)
Physics
Condensed Matter
Soft Condensed Matter
11 Figures in 13 files + LaTex file. 20 pages. Accepted to Phys. Rev. E. Corrected typos and references
Scientific paper
10.1103/PhysRevE.62.5296
A model for ionic solutions with an attractive short-range pair interaction between the ions is presented. The short-range interaction is accounted for by adding a quadratic non-local term to the Poisson-Boltzmann free energy. The model is used to study solvent effects in a planar electric double layer. The counter-ion density is found to increase near the charged surface, as compared with the Poisson-Boltzmann theory, and to decrease at larger distances. The ion density profile is studied analytically in the case where the ion distribution near the plate is dominated only by counter-ions. Further away from the plate the density distribution can be described using a Poisson-Boltzmann theory with an effective surface charge that is smaller than the actual one.
Andelman David
Burak Yoram
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