Vapour-liquid coexistence for purely repulsive point-Yukawa fluids

被引:35
作者
Dijkstra, M
van Roij, R
机构
[1] Ecole Normale Super Lyon, Ctr Europeen Calcul Atom & Mol, F-69364 Lyon 07, France
[2] Ecole Normale Super Lyon, Phys Lab, CNRS, URA 1325, F-69364 Lyon, France
关键词
D O I
10.1088/0953-8984/10/6/005
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Using a simple mean-field theory and MC simulations we demonstrate the existence of a vapour-liquid transition in a fluid with purely repulsive Yukawa pair interactions and a density-dependent screening parameter. This transition does not fit into the classical Van der Waals picture, as the mechanism of liquid condensation is not caused by long-ranged attractions. The phase separation is, instead, driven by the enhanced screening at higher densities, which leads to ideal-gas behaviour at sufficiently high densities. A fluid at intermediate densities can thus reduce its free energy by separating into a dilute vapour and a high-density liquid.
引用
收藏
页码:1219 / 1228
页数:10
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