Liquid Polymorphism and Density Anomaly in a Lattice Gas Model

Abstract

We present a simple model for an associating liquid in which polymorphism and density anomaly are connected. Our model combines a two dimensional lattice gas with particles interacting through a soft core potential and orientational degrees of freedom represented through thermal \char`\"{}ice variables\char`\"{} . The competition between the directional attractive forces and the soft core potential leads to a phase diagram in which two liquid phases and a density anomaly are present. The coexistence line between the low density liquid and the high density liquid has a positive slope contradicting the surmise that the presence of a density anomaly implies that the high density liquid is more entropic than the low density liquid.

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Cited by in corpus (28)

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• Metastable liquid-liquid coexistence and density anomalies in a core-softened fluid
• Anomalies in a waterlike model confined between plates
• Thermodynamic, Dynamic and Structural Anomalies for Shoulder-like potentials
• A water-like model under confinement for hydrophobic and hydrophilic particle-plate interaction potentials
• Liquid Polymorphism and Double Criticality in a Lattice Gas Model
• Thermodynamic and Dynamic Anomalies for Dumbbell Molecules Interacting with a Repulsive Ramp-Like Potential
• Density anomaly in a competing interactions lattice gas model
• Phase diagram of a two-dimensional lattice gas model of a ramp system
• Liquid polymorphism and density anomaly in a three-dimensional associating lattice gas
• Liquid crystal phase and waterlike anomalies in a core-softened shoulder-dumbbells system
• Liquid polymorphism, order-disorder transitions and anomalous behavior: a Monte Carlo study of the Bell-Lavis model for water
• Diffusion Anomaly in a three dimensional lattice gas
• Diffusion Anomaly in an Associating Lattice Gas Model
• Thermodynamic, Dynamic, Structural and Excess Entropy Anomalies for core-softened potentials
• Solution of an associating lattice gas model with density anomaly on a Husimi lattice
• Dynamic Transitions in a Two Dimensional Associating Lattice Gas Model
• General approach for studying first-order phase transitions at low temperatures
• Exploiting a semi-analytic approach to study first order phase transitions
• Relation between occupation in the first coordination shells and Widom line in Core-Softened Potentials
• Hierarchical Lattice Models of Hydrogen Bond Networks in Water
• Order-disorder transition in a two-dimensional associating lattice gas
• Thoroughly analysis of the phase diagram for the Bell-Lavis model: An entropic simulational study
• Phase Diagram and Thermodynamic and Dynamic Anomalies in a Pure Repulsive Model
• Hydration and anomalous solubility of the Bell-Lavis model as solvent
• Efficient simulated tempering with approximated weights: Applications to first-order phase transitions
• Phase diagram and critical properties of a two-dimensional associating lattice gas