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Polymorphism in simple liquids: a Gibbs ensemble Monte Carlo study.

Benedetto Pellicane1, Giuseppe Pellicane, Gianpietro Malescio

  • 1Istituto Nazionale per la Fisica della Maleria (INFM) and Dipartimento di Fisica, Università di Messina, Contrada Papardo, CP 50, 98166 Messina, Italy.

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

Gibbs ensemble Monte Carlo simulations reveal two phase equilibria in hard sphere systems with attractive and repulsive interactions. Critical parameters for liquid-gas separation are lower than for liquid-liquid separation.

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Area of Science:

  • Statistical Mechanics
  • Computational Physics
  • Materials Science

Background:

  • Understanding phase behavior in systems with competing interactions is crucial for materials design.
  • Previous studies have explored phase equilibria in various.');
  • The specific system of hard spheres with a repulsive shoulder and attractive well requires detailed investigation.

Purpose of the Study:

  • To investigate the phase equilibria of a one-component system of hard spheres with a repulsive shoulder and attractive well.
  • To determine the critical parameters for both liquid-gas and liquid-liquid phase transitions.
  • To assess the influence of finite size effects on simulation results.

Main Methods:

  • Gibbs ensemble Monte Carlo (GEMC) simulations were employed.

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  • The simulations focused on a one-component system of hard spheres.
  • Analysis involved interpolation of binodal points to estimate critical parameters.
  • Main Results:

    • The study confirmed the existence of two distinct phase equilibria: liquid-gas and liquid-liquid.
    • Finite size effects had a minimal impact on the GEMC estimates of critical parameters.
    • The critical temperature and pressure for liquid-gas separation were found to be lower than those for liquid-liquid separation.

    Conclusions:

    • The investigated system exhibits complex phase behavior with two coexisting equilibria.
    • GEMC simulations provide reliable critical parameter estimates, minimally affected by system size.
    • The findings offer insights into the interplay of repulsive and attractive forces in determining phase transitions.