2005
DOI: 10.1088/0953-8984/17/3/001
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Density anomaly in a competing interactions lattice gas model

Abstract: Water and other tetrahedral liquids are characterized by a density anomaly whose origin is not well understood. A very simple model of a short-range attraction followed by an outer shell repulsion is proposed as a test potential for the density anomaly. We show that these competing interactions when applied to a two-dimensional lattice gas leads to the formation of two liquid phases and to the appearance of a density anomaly. The coexistence line between the two liquid phases meets a critical line between the … Show more

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Cited by 29 publications
(29 citation statements)
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References 38 publications
(47 reference statements)
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“…Averaged over orientational degrees of freedom, our model can be seen as some kind of shoulder potential, with the liquid-liquid coexistence line being present only for a repulsive¨van der for which, however, the density anomaly is absent. On the other hand, a density anomaly has been observed in a number of shoulder-like lattice models in which the major ingredient is the competition between two scales [31,32,33]. This feature is present in our case.…”
Section: Results and Conclusionsupporting
confidence: 44%
“…Averaged over orientational degrees of freedom, our model can be seen as some kind of shoulder potential, with the liquid-liquid coexistence line being present only for a repulsive¨van der for which, however, the density anomaly is absent. On the other hand, a density anomaly has been observed in a number of shoulder-like lattice models in which the major ingredient is the competition between two scales [31,32,33]. This feature is present in our case.…”
Section: Results and Conclusionsupporting
confidence: 44%
“…They possess a repulsive core that exhibits a region of softening where the slope changes dramatically. This region can be a shoulder or a ramp [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36].…”
Section: Introductionmentioning
confidence: 99%
“…They possess a repulsive core that exhibits a region of softening where the slope changes dramatically. This region can be a shoulder or a ramp [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32]. Unfortunately, these models, even when successful in showing density anomaly and two liquid phases, fail in providing the connection between the isotropic effective potential and the realistic potential of water.…”
Section: Introductionmentioning
confidence: 99%