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Preparation and 3D Tracking of Catalytic Swimming Devices
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Phase-separation models for swimming enhancement in complex fluids.

Yi Man1, Eric Lauga1

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, CB3 0WA, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 19, 2015
PubMed
Summary
This summary is machine-generated.

Microscopic swimmers can move faster in complex fluids due to phase separation. This creates low-viscosity layers near the swimmer, reducing friction and enhancing locomotion speed.

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Area of Science:

  • Fluid dynamics
  • Biophysics
  • Materials science

Background:

  • Microscopic swimmers navigate complex, non-Newtonian fluids.
  • Existing theories suggest hindered locomotion in such environments.
  • Experimental data indicates potential for locomotion enhancement.

Purpose of the Study:

  • Propose a physical mechanism for enhanced microswimmer locomotion in complex fluids.
  • Investigate the role of fluid phase separation near swimmer surfaces.
  • Quantify the impact of reduced viscosity layers on swimming speed.

Main Methods:

  • Modeling fluid phase separation near swimmer surfaces.
  • Employing two models: apparent slip length and explicit viscosity change.
  • Analyzing two canonical low-Reynolds number locomotion scenarios (2D sheet, 3D filament).

Main Results:

  • Phase separation leads to low-viscosity layers, promoting slip.
  • These layers significantly decrease viscous friction.
  • Locomotion speeds increased, potentially by orders of magnitude, for both analyzed setups.

Conclusions:

  • Phase separation in microstructured fluids enhances microswimmer locomotion.
  • The proposed mechanism explains observed experimental phenomena.
  • Further validation against recent experimental findings is discussed.