Phase behavior of a fluid with competing attractive and repulsive interactions
journal contributionposted on 2014-10-09, 13:41 authored by Andrew ArcherAndrew 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.
A.J.A. gratefully acknowledges support from RCUK.
- Mathematical Sciences
Published inPHYSICAL REVIEW E
Pages? - ? (14)
CitationARCHER, 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
- VoR (Version of Record)
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NotesThis article was published in the journal, Physical Review E [© The American Physical Society].