Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-03-20
Journal of Chemical Physics volume 126, 244510 (2007)
Physics
Condensed Matter
Soft Condensed Matter
29 pages, 10 figures
Scientific paper
10.1063/1.2748043
Using computer simulations and a thermodynamically self consistent integral equation we investigate the phase behaviour and thermodynamic anomalies of a fluid composed of spherical particles interacting via a two-scale ramp potential (a hard core plus a repulsive and an attractive ramp) and the corresponding purely repulsive model. Both simulation and integral equation results predict a liquid-liquid de-mixing when attractive forces are present, in addition to a gas-liquid transition. Furthermore, a fluid-solid transition emerges in the neighbourhood of the liquid-liquid transition region, leading to a phase diagram with a somewhat complicated topology. This solidification at moderate densities is also present in the repulsive ramp fluid, thus preventing fluid-fluid separation.
Almarza Noe G.
Lomba Enrique
Martin Chris
McBride Cameron
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