The effects of competing interactions on the liquid-vapor transition in continuous systems have been studied by considering a simple hard-core model fluid with a two-Yukawa tail potential which is attractive at a short distance and repulsive at a long distance. We find that the size of the temperature-density region where the system experiences large density fluctuations without undergoing phase separation is greatly increased with respect to a fluid with a purely attractive tail potential. Moreover, in this region one observes a remarkable enhancement of the short-range correlations up to distances that can be more than one order of magnitude larger than the particle size. These effects are related with the occurrence of clouds of strongly correlated particles as a consequence of the competition between the attractive and the repulsive part of the interaction.

Enhanced density fluctuations in fluid systems with competing interactions / D. Pini, G. Jialin, A. Parola, L. Reatto. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - 327:3/4(2000 Sep), pp. 209-215. [10.1016/S0009-2614(00)00763-6]

Enhanced density fluctuations in fluid systems with competing interactions

D. Pini
Primo
;
L. Reatto
Ultimo
2000

Abstract

The effects of competing interactions on the liquid-vapor transition in continuous systems have been studied by considering a simple hard-core model fluid with a two-Yukawa tail potential which is attractive at a short distance and repulsive at a long distance. We find that the size of the temperature-density region where the system experiences large density fluctuations without undergoing phase separation is greatly increased with respect to a fluid with a purely attractive tail potential. Moreover, in this region one observes a remarkable enhancement of the short-range correlations up to distances that can be more than one order of magnitude larger than the particle size. These effects are related with the occurrence of clouds of strongly correlated particles as a consequence of the competition between the attractive and the repulsive part of the interaction.
comnpeting interactions ; 2-Yukawa potential ; density fluctuations ; correlations ; self-consistent Ornstein-Zernike approximation ; hierarchical reference theory
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/188644
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