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Active fluids near walls create repulsive forces on asymmetric objects, guiding them to specific locations. This interaction is mediated by the fluid and depends on object asymmetry, not microscopic details.

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Area of Science:

  • Physics of active matter
  • Soft condensed matter physics
  • Fluid dynamics

Background:

  • Active fluids exhibit complex behaviors due to self-propelling particles.
  • Interactions between passive objects and confining boundaries in active fluids are not fully understood.
  • Asymmetric objects may respond differently to fluid-mediated forces compared to symmetric ones.

Purpose of the Study:

  • To investigate the forces exerted by confining walls on asymmetric passive objects within active fluids.
  • To determine the nature and range of these forces.
  • To explore the implications of these forces for object localization.

Main Methods:

  • Theoretical modeling of active fluid-wall-object interactions.
  • Application of a generalized image theorem to compute forces.
  • Analysis of object behavior in confining geometries, specifically circular cavities.

Main Results:

  • Confining walls generate nonconservative, long-ranged forces on asymmetric passive objects.
  • These repulsive forces are independent of the object's microscopic properties and orientation.
  • Asymmetric objects are repelled from walls, potentially localizing at the center of circular cavities.

Conclusions:

  • Walls in active fluids act as sources of generalized forces on embedded asymmetric objects.
  • The observed repulsion and localization phenomena highlight the distinct behavior of asymmetric objects in active environments.
  • This work provides a framework for understanding and predicting the dynamics of asymmetric objects in active confined systems.