Salty solutions near a charged modulated interface
Department of Physics and Astronomy, Iowa State University and Ames Laboratory, IA 50011, Ames, USA
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Accepted: 2 June 2005
Published online: 23 August 2005
Charged monolayers at a liquid-vapor interface may be found in a crystalline state, resulting in a surface density of charge that displays periodic modulations. In this paper we discuss how these modulations affect different thermodynamical and mechanical properties (compared with the equivalent uniform charge density) of a system consisting of the charged monolayer and a bulk solution including a finite concentration of counter-ions and co-ions. It is shown that very accurate results for low and moderate salt concentrations are possible within an expansion in the Fourier modes of the modulations, the Weak Amplitude Perturbation (WAP), if the finite size of the ions are included as a Stern layer. We conclude by discussing the implications and the relevance of these results for both theoretical studies and experiments.
PACS: 82.60.Lf Thermodynamics of solutions – / 61.20.Qg Structure of associated liquids: electrolytes, molten salts, etc. – / 68.03.Cd Surface tension and related phenomena –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2005