Charged hard dumbbell in the binding mean-spherical approximation |
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| Authors: | J W JIANG L BLUM O BERNARD |
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| Institution: | 1. Department of Chemistry and Biochemistry , University of South Carolina , Columbia, SC, 29208, USA;2. Department of Physics , University of Puerto Rico , P.O. Box 23343, Rio Piedras, PR, 00931, USA;3. Laboratoire Liquides Ioniques et Interfaces Chargées, Boite postale 51, Université Pierre et Marie Curie , 4, Place Jussieu, 75252, Paris Cedex 05, France |
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| Abstract: | A simple model for charged hard dumbbell is proposed in the binding mean-spherical approximation (BIMSA). The thermodynamic properties are analytical solutions of the unique screening parameter ΓB with full association. Critical point and vapour-liquid coexistence curve are identical to those of Kalyuzhnyi, Yu. V., 1998, Molec. Phys., 94, 735, where a site-site integral equation has to be solved. Substituting Γ without association for ΓB, the BIMSA reduces to the simple interpolation scheme (SIS). A simple interpolation between the SIS and the BIMSA is proposed: this gives the critical point (Tc? = 0.0525, p?c = 0.0640) which, for the time being, is the closest to the computer simulation results. Similarity between the charged hard dumbbell and the restricted primitive model of electrolyte is also addressed. |
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