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Colloidal dynamics on disordered substrates.

C Reichhardt1, C J Olson

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

Physical Review Letters
|August 23, 2002
PubMed
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Driven colloids exhibit a sharp transition from ordered to disordered states as substrate strength increases. This crossover reveals critical behavior and leads to the formation of flow channels in the disordered regime.

Area of Science:

  • Condensed matter physics
  • Soft matter physics
  • Statistical mechanics

Background:

  • Colloidal systems are widely studied for their complex behaviors.
  • Understanding particle dynamics in disordered environments is crucial for material science.
  • The peak effect in superconductors provides a relevant analogy for phase transitions.

Purpose of the Study:

  • To investigate the depinning dynamics of driven colloids in quenched disordered substrates.
  • To characterize the transition from elastic depinning to inhomogeneous depinning.
  • To analyze the critical behavior and transient dynamics in colloidal systems.

Main Methods:

  • Langevin simulations were employed to model the colloidal system.
  • System parameters were varied to study the effect of substrate strength.

Related Experiment Videos

  • Velocity-force relationships and transient responses to driving force pulses were analyzed.

    • Main Results:

    • A sharp crossover from ordered elastic depinning to inhomogeneous depinning was observed with increasing substrate strength.
    • A significant increase in depinning force, analogous to the superconducting peak effect, was identified.
    • Criticality at depinning was evidenced by changes in scaling exponents at the order-disorder transition.
    • Pronounced, long-lived colloidal flow channels formed during transient responses in the disordered regime.

    Conclusions:

    • The study reveals a distinct order-to-disorder transition in driven colloids within quenched disorder.
    • Colloidal systems exhibit critical phenomena and unique transient dynamics, including flow channel formation.
    • The findings offer insights into particle transport in disordered media and parallels with superconductivity.