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Phase behavior of a fluid with competing attractive and repulsive interactions

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posted on 09.10.2014 by Andrew Archer, Nigel B. Wilding
Fluids in which the interparticle potential has a hard core, is attractive at moderate separations, and repulsive at large separations are known to exhibit unusal phase behavior, including stable inhomogeneous phases. Here we report a joint simulation and theoretical study of such a fluid, focusing on the relationship between the liquid-vapor transition line and any new phases. The phase diagram is studied as a function of the amplitude of the attraction for a certain fixed amplitude of the long ranged repulsion. We find that the effect of the repulsion is to substitute the liquid-vapor critical point and a portion of the associated liquid-vapor transition line, by two first-order transitions. One of these transitions separates the vapor from a fluid of spherical liquidlike clusters; the other separates the liquid from a fluid of spherical voids. At low temperature, the two transition lines intersect one another and a vapor-liquid transition line at a triple point. While most integral equation theories are unable to describe the new phase transitions, the Percus-Yevick approximation does succeed in capturing the vapor-cluster transition, as well as aspects of the structure of the cluster fluid, in reasonable agreement with the simulation results.

Funding

A.J.A. gratefully acknowledges support from RCUK.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

PHYSICAL REVIEW E

Volume

76

Issue

3

Pages

? - ? (14)

Citation

ARCHER, A.J. and WILDING, N.B., 2007. Phase behavior of a fluid with competing attractive and repulsive interactions. Physical Review E, 76 (3), 031501.

Publisher

© The American Physical Society

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2007

Notes

This article was published in the journal, Physical Review E [© The American Physical Society].

ISSN

1539-3755

Language

en

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