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Related Experiment Videos

Liquid-liquid phase transitions for soft-core attractive potentials.

A Skibinsky1, S V Buldyrev, G Franzese

  • 1Center for Polymer Studies and Department of Physics, Boston University, Boston, Massachusetts 02215, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 13, 2004
PubMed
Summary
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This study reveals a novel potential with two critical points: a gas-liquid critical point and a liquid-liquid critical point. The liquid-liquid critical point

Area of Science:

  • Thermodynamics and Statistical Mechanics
  • Computational Physics
  • Materials Science

Background:

  • Molecular dynamics simulations are crucial for understanding phase transitions in matter.
  • Discontinuous potentials, combining repulsive and attractive forces, model complex fluid behaviors.
  • Previous work identified two metastable gas-liquid critical points for a specific potential.

Purpose of the Study:

  • To systematically investigate the effect of potential parameters on the phase diagram of a one-component system.
  • To determine the conditions under which both gas-liquid and liquid-liquid critical points exist.
  • To develop a theoretical model that explains the behavior of these critical points.

Main Methods:

  • Event-driven molecular dynamics simulations of spherical particles.

Related Experiment Videos

  • Systematic variation of parameters for a discontinuous potential (repulsive square soft core and attractive square well).
  • Development and application of a modified van der Waals equation.

    • Main Results:

    • A broad range of potential parameters yields both a gas-liquid critical point (C1) and a liquid-liquid critical point (C2).
    • Critical temperature and pressure derivatives for C1 resemble those of standard liquids.
    • For C2, critical pressure decreases with increasing critical temperature, limiting its existence to a finite positive pressure range.

    Conclusions:

    • The studied soft-core potential can exhibit both gas-liquid and liquid-liquid phase transitions.
    • A modified van der Waals equation qualitatively reproduces the behavior of both critical points.
    • This model has implications for understanding phase behavior in colloids, proteins, and liquid metals.