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Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis
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Active matter ratchets with an external drift.

C Reichhardt1, C J Olson Reichhardt1

  • 1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 4, 2014
PubMed
Summary
This summary is machine-generated.

Active matter ratchets in asymmetric funnel arrays show enhanced effects with external drives. Different particle run lengths can lead to opposing movement directions, demonstrating tunable transport properties.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Active matter systems, like swimming bacteria, exhibit unique transport phenomena.
  • Ratchet effects in asymmetric structures can generate directed motion without external forces.
  • Previous studies focused on 1D arrays and passive particles or external fields.

Purpose of the Study:

  • To investigate active ratchets in 2D asymmetric funnel and L-shaped arrays.
  • To explore the influence of externally applied DC drives on ratchet effects.
  • To analyze the impact of particle-particle steric interactions on transport.

Main Methods:

  • Theoretical examination of active ratchets in 2D funnel and L-shaped geometries.
  • Simulation of run-and-tumble particles with varying run lengths.
  • Inclusion of external DC drift forces and particle-particle steric interactions.

Main Results:

  • Strong enhancement of ratchet effects observed under specific conditions with DC drives.
  • Separation of particle populations based on run length, leading to opposite directional movement.
  • Transverse rectification observed in L-shaped arrays, perpendicular to the applied drift.
  • Steric interactions can either enhance or suppress ratchet effects, dependent on geometry and particle properties.

Conclusions:

  • 2D active ratchets offer enhanced control over particle transport compared to 1D systems.
  • Tunable separation of particles with different run lengths is achievable.
  • External drives and steric interactions provide additional mechanisms for controlling active matter transport.