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Self-propulsion in 2D confinement: phoretic and hydrodynamic interactions.

Akash Choudhary1,2, K V S Chaithanya1, Sébastien Michelin3

  • 1Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600036, India.

The European Physical Journal. E, Soft Matter
|July 20, 2021
PubMed
Summary
This summary is machine-generated.

Chemically active Janus particles exhibit new self-propulsion behaviors in confined environments. This study reveals novel oscillation and centerline-seeking dynamics due to boundary interactions.

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Area of Science:

  • Physics
  • Chemical Engineering
  • Biophysics

Background:

  • Chemically active Janus particles self-propel via surface concentration gradients.
  • Studies primarily focus on unbounded domains, with limited research in confined, biologically relevant settings.

Purpose of the Study:

  • Investigate Janus particle motion under weak confinement between two planar walls.
  • Analyze the impact of confinement on phoretic and hydrodynamic interactions.
  • Identify novel dynamical states and behaviors.

Main Methods:

  • Utilized the method of reflections to model interactions with confining boundaries.
  • Simulated Janus sphere motion at arbitrary positions and orientations.
  • Analyzed particle trajectories using phase diagrams based on activity and solute interactions.

Main Results:

  • Identified near-wall states like 'sliding' and 'hovering'.
  • Discovered new confined states: channel-spanning and damped centerline oscillations.
  • Observed distinct behaviors for inert-facing versus active-facing Janus particles.

Conclusions:

  • Confinement significantly alters Janus particle dynamics, introducing new oscillation modes.
  • Boundary interactions are crucial for understanding self-propelled particle behavior in confined spaces.
  • Surface properties and interactions influence long-range sensing in biological and artificial swimmers.