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Confinement-induced alternating interactions between inclusions in an active fluid.

Mahdi Zarif1, Ali Naji2,3

  • 1Department of Physical and Computational Chemistry, Shahid Beheshti University, Tehran 19839-9411, Iran.

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Summary

Active particle baths create tunable interactions between colloidal particles. Confinement in narrow channels leads to novel attractive and repulsive forces, influencing particle arrangement.

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Area of Science:

  • Soft matter physics
  • Statistical mechanics
  • Colloidal science

Background:

  • Depletion interactions in equilibrium systems arise from excluded volume effects.
  • Active particle systems exhibit unique emergent behaviors due to self-propulsion.
  • Confinement significantly alters particle-mediated interactions.

Purpose of the Study:

  • Investigate effective interactions between colloidal inclusions mediated by an active particle bath.
  • Analyze the impact of planar confinement on these active depletion interactions.
  • Explore the role of inclusion orientation and bath activity.

Main Methods:

  • Simulations of active Brownian particles in a 2D channel.
  • Modeling interactions between two fixed, disk-shaped inclusions.
  • Varying system parameters like channel width and inclusion configuration.

Main Results:

  • Active particle baths induce tunable attractive and repulsive interactions.
  • Confinement leads to alternating interaction profiles (attraction/repulsion) in narrow channels.
  • Inclusion orientation and channel width modulate interaction strength and range.

Conclusions:

  • Confinement effects are governed by active particle layering near surfaces.
  • Narrow channels promote complex, wave-like structuring of active particles.
  • Active depletion interactions are highly sensitive to geometric constraints.