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Related Experiment Videos

Directional locking effects and dynamics for particles driven through a colloidal lattice.

C Reichhardt1, C J Olson Reichhardt

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 1, 2004
PubMed
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We discovered novel dynamical locking behaviors in colloidal systems where a driven particle interacts with a distortable lattice. This interaction leads to complex particle motion and potential applications in particle segregation.

Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Nonlinear Dynamics

Background:

  • Understanding particle dynamics in ordered media is crucial for materials science.
  • Colloidal lattices offer a tunable platform to study driven particle behavior.
  • The response of a lattice to a driven particle can lead to complex emergent phenomena.

Purpose of the Study:

  • To investigate the dynamics of a single colloidal particle driven through a deformable colloidal lattice.
  • To explore the influence of drive angle and particle-lattice interaction on dynamical locking phenomena.
  • To identify potential applications of these phenomena, such as particle segregation.

Main Methods:

  • Simulating the motion of a driven colloidal particle within a distortable colloidal lattice.

Related Experiment Videos

  • Systematically varying the angle of the applied drive relative to the lattice orientation.
  • Analyzing particle velocity, drag forces, and lattice distortions under different conditions.

    • Main Results:

    • Observed rich dynamical locking phenomena, including motion not aligned with the drive.
    • Identified anomalies in velocity-force curves, such as steps and negative differential resistance.
    • Demonstrated enhanced directional locking with increased particle-lattice interaction and lattice distortion.
    • Found that lattice distortion leads to richer behaviors compared to fixed substrates.

    Conclusions:

    • The distortable nature of the colloidal lattice significantly impacts driven particle dynamics, enabling complex locking behaviors.
    • These findings suggest potential applications in particle segregation based on charge-dependent locking angles.
    • Pronounced locking effects are expected to persist up to the colloidal lattice's melting transition temperature.