Crossover behavior in fluids with Coulomb interactions

O. V. Patsahan (), J.-M. Caillol and I. M. Mryglod

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 58, issue 4, 449-459

Abstract: According to extensive experimental findings, the Ginzburg temperature t G for ionic fluids differs substantially from that of nonionic fluids [W. Schröer, H. Weigärtner, Pure Appl. Chem. 76, 19 (2004)]. A theoretical investigation of this outcome is proposed here by a mean field analysis of the interplay of short and long range interactions on the value of t G . We consider a quite general continuous charge-asymmetric model made of charged hard spheres with additional short-range interactions (without electrostatic interactions the model belongs to the same universality class as the 3D Ising model). The effective Landau-Ginzburg Hamiltonian of the full system near its gas-liquid critical point is derived from which the Ginzburg temperature is calculated as a function of the ionicity. The results obtained in this way for t G are in good qualitative and sufficient quantitative agreement with available experimental data. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 05.70.Jk Critical point phenomena; 64.60.Fr Equilibrium properties near critical points; critical exponents (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00247-7

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