Ionic fluids: charge and density correlations near gas-liquid criticality

Details Ionic fluids: charge and density correlations near gas-liquid criticality Ionic fluids: charge and density correlations near gas-liquid criticality

2005-05-17

arxiv.org/abs/cond-mat/0505402v2

Journal of Physics: Condensed Matter 17 (2005) L251

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1088/0953-8984/17/25/L02

The correlation functions of an ionic fluid with charge and size asymmetry are studied within the framework of the random phase approximation. The results obtained for the charge-charge correlation function demonstrate that the second-moment Stillinger-Lovett (SL) rule is satisfied away from the gas-liquid critical point (CP) but not, in general, at the CP. However in the special case of a model without size assymetry the SL rules are satisfied even at the CP. The expressions for the density-density and charge-density correlation functions valid far and close to the CP are obtained explicitely.

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