Multiple liquid-liquid critical points and anomalies in core-softened potentials

The relation between liquid-liquid phase transitions and waterlike density anomalies in core-softened potentials of fluids was investigated in an exactly solvable one dimensional lattice model and a in a three dimensional fluid with fermi-like potential, the latter by molecular dynamics. Both system...

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Bibliographic Details
Published inarXiv.org
Main Authors Barbosa, Marco Aurélio A, Salcedo, Evy, Barbosa, Marcia
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 19.06.2012
Subjects
Anomalies
Computational fluid dynamics
Critical point
Density
Liquid phases
Molecular dynamics
Phase transitions
Physics - Soft Condensed Matter
Thermal expansion
Three dimensional models
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Summary:The relation between liquid-liquid phase transitions and waterlike density anomalies in core-softened potentials of fluids was investigated in an exactly solvable one dimensional lattice model and a in a three dimensional fluid with fermi-like potential, the latter by molecular dynamics. Both systems were shown to present three liquid phases, two liquid-liquid phase transitions closely connected to two distinct regions of anomalous density increase. We propose that an oscillatory behavior observed on the thermal expansion coefficient as a function of pressure can be used as a signature of the connection between liquid-liquid phase and density.
ISSN:2331-8422
DOI:10.48550/arxiv.1206.1572