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Mixing effects for the structural relaxation in binary hard-sphere liquids.

G Foffi1, W Götze, F Sciortino

  • 1Dipartimento di Fisica and INFM Center for Statistical Mechanics and Complexity, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy.

Physical Review Letters
|October 4, 2003
PubMed
Summary

Binary hard sphere mixtures exhibit distinct glassy dynamics. Large size disparities accelerate long-time dynamics with more small particles, while small disparities slow them down, aligning with mode-coupling theory predictions.

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Area of Science:

  • Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding the behavior of complex fluids, such as binary mixtures, is crucial for various scientific and industrial applications.
  • Glassy dynamics in systems of interacting particles present a significant challenge in condensed matter physics.
  • Molecular dynamics simulations offer a powerful tool to probe the microscopic behavior of such systems.

Purpose of the Study:

  • To investigate the impact of mixing percentage and size disparity on the glassy dynamics of binary hard sphere mixtures.
  • To explore the evolution of dynamics over extended time scales using molecular dynamics simulations.
  • To compare simulation results with theoretical predictions, specifically mode-coupling theory.

Main Methods:

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  • Extensive molecular-dynamics simulations were performed.
  • Binary mixtures of hard spheres with varying size disparities and mixing percentages were studied.
  • Simulations covered packing fractions up to 0.605 and characteristic time intervals up to 5 orders of magnitude.

    • Main Results:

    • Two distinct scenarios for the evolution of glassy dynamics were observed upon mixing.
    • For large size disparities, increasing the proportion of smaller particles accelerates long-time dynamics.
    • Conversely, for small size disparities, increasing the proportion of smaller particles leads to a slowing down of dynamics.

    Conclusions:

    • The mixing of hard spheres significantly alters glassy dynamics in a manner dependent on size disparity.
    • Observed dynamics align with predictions from mode-coupling theory for ideal-glass transitions.
    • This study provides valuable insights into the complex interplay between composition and dynamics in multi-component systems.