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Crossover from intermittent to continuum dynamics for locally driven colloids.

C Reichhardt1, C J Olson Reichhardt

  • 1Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|February 21, 2006
PubMed
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We simulated charged colloids moving through disordered systems. The driven particle

Area of Science:

  • Soft Matter Physics
  • Statistical Mechanics
  • Computational Physics

Background:

  • Understanding the dynamics of driven particles in disordered media is crucial for soft matter systems.
  • Interactions and charge heterogeneity significantly influence particle transport properties.
  • Previous studies often focused on simplified models or specific interaction regimes.

Purpose of the Study:

  • To investigate the influence of charge mismatch on the dynamics of a driven colloid in a disordered environment.
  • To characterize the velocity-force relationship and velocity fluctuations under varying charge conditions.
  • To elucidate the underlying dynamic regimes and predict transient responses.

Main Methods:

  • Numerical simulations of a single colloid driven through a disordered assembly of interacting colloids.

Related Experiment Videos

  • Systematic variation of the charge of the driven colloid (q(d)) relative to the background colloids (q).
  • Analysis of velocity-force relations, velocity fluctuations, and their statistical properties (e.g., intermittency, Gaussianity).

    • Main Results:

    • When driven colloid charge q(d) is approximately equal to background charge q, a nonlinear velocity-force relation and intermittent 1/f velocity fluctuations are observed.
    • For q(d) much greater than q, the average velocity decreases, the velocity-force relation becomes linear, and fluctuations transition to Gaussian.
    • A crossover between strongly intermittent heterogeneous dynamics and continuum dynamics is identified.

    Conclusions:

    • The charge ratio between a driven particle and its disordered environment dictates the nature of particle transport.
    • Distinct dynamic regimes characterized by different statistical properties of velocity fluctuations exist.
    • The findings provide a framework for predicting transient behaviors in complex colloidal systems.