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Particle dynamics in fluids with random interactions.

Lenin S Shagolsem1, Yitzhak Rabin1

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We explored particle dynamics in a 2D Lennard-Jones fluid with all different particles (APD). Lowering temperature increases complexity due to particle differences and phase coexistence, impacting cell biology analysis.

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Area of Science:

  • Statistical mechanics
  • Condensed matter physics
  • Computational chemistry

Background:

  • Previous work characterized equilibrium properties of the all-particles-different (APD) system.
  • Understanding particle dynamics is crucial for complex fluids and biological systems.

Purpose of the Study:

  • Investigate the statistical properties of particle trajectories in a multi-component 2D Lennard-Jones fluid.
  • Compare dynamics of the APD system with a one-component Lennard-Jones fluid.
  • Analyze how temperature affects particle dynamics in fluid and solid-fluid coexistence regions.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Calculated mean-square displacement.
  • Analyzed displacement, angle, and waiting time distributions.

Main Results:

  • Particle dynamics in the APD system become more complex as temperature decreases.
  • Particle differences are amplified by neighborhood ordering and phase inhomogeneity.
  • Observed deviations from one-component fluid dynamics.

Conclusions:

  • The intrinsic differences between particles significantly influence dynamics in multi-component systems.
  • Findings have implications for interpreting protein tracking in living cells.
  • The study highlights the importance of particle identity in complex fluid dynamics.