Universal behavior of soft-core fluids near the threshold of thermodynamic stability

The Journal of Chemical Physics
G MalescioSanti Prestipino

Abstract

We study, by using liquid-state theories and Monte Carlo simulation, the behavior of systems of classical particles interacting through a finite pair repulsion supplemented with a longer range attraction. Any such potential can be driven Ruelle-unstable by increasing the attraction at the expense of repulsion, until the thermodynamic limit is lost. By examining several potential forms, we find that all systems exhibit a qualitatively similar behavior in the fluid phase as the threshold of thermodynamic stability is approached (and possibly surpassed). The general feature underlying the approach to Ruelle instability is a pronounced widening of the liquid-vapor binodal (and spinodal) line at low temperatures, to such an extent that at the stability threshold a vanishing-density vapor would coexist with a diverging-density liquid. We attempt to rationalize the universal pathway to Ruelle instability in soft-core fluids by appealing to a heuristic argument.

References

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Mar 5, 2004·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Igor StankovicMartin Kröger
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Jan 7, 2009·The Journal of Chemical Physics·Gianpietro MalescioSanti Prestipino
Mar 5, 2014·The Journal of Chemical Physics·Santi PrestipinoPaolo V Giaquinta
Aug 15, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Cristina SperanzaPaolo V Giaquinta
Dec 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Gianpietro Malescio, Santi Prestipino
Oct 17, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D M Heyes, G Rickayzen

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Citations

Aug 6, 2019··Andrés SantosJosé Luis Sánchez-Tena

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