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Thermodynamics and phase behavior of a triangle-well model and density-dependent variety

J. Chem. Phys. 130, 014502 (2009); doi:10.1063/1.3049399

Published 5 January 2009

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Shiqi Zhou
School of Physics Science and Technology, Central South University, Changsha, Hunan 410083, China
A hard sphere+triangle-well potential is employed to test a recently proposed thermodynamic perturbation theory (TPT) based on a coupling parameter expansion. It is found that the second-order term of the coupling parameter expansion surpasses by far that of a high temperature series expansion under a macroscopic compressibility approximation and several varieties. It is also found that the fifth-order version displays best among all of the numerically accessible versions with dissimilar truncation orders. Particularly, the superiority of the fifth-order TPT from other available liquid state theories is exhibited the most incisively when the temperature of interest obviously falls. We investigate the modification of the phase behavior of the hard sphere+triangle-well fluid resulting from a density dependence imposed on the original potential function. It is shown that (1) the density dependence induces polymorphism of fluid phase, particularly liquid-liquid transition in metastable supercooled region, and (2) along with enhanced decaying of the potential function as a function of bulk density, both the liquid-liquid transition and vapor-liquid transition tend to be situated at the domain of lower temperature, somewhat similar to a previously disclosed thumb rule that the fluid phase transition tends to metastable with respect to the fluid-solid transition as the range of the attraction part of a density-independence potential is sufficiently short compared to the range of the repulsion part of the same density-independence potential. ©2009 American Institute of Physics
History: Received 28 August 2008; accepted 24 November 2008; published 5 January 2009
Permalink: http://link.aip.org/link/?JCPSA6/130/014502/1
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KEYWORDS and PACS

Keywords
PACS
  • 64.70.Ja
    Liquid-liquid transitions
  • 64.70.F-
    Liquid-vapor transitions
  • 61.20.Gy
    Theory and models of liquid structure
  • 65.20.-w
    Thermal properties of liquids
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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