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Tunable depletion force in active and crowded environments.

Fane Feng1, Ting Lei1, Nanrong Zhao1

  • 1Department of Physical Chemistry, College of Chemistry, Sichuan University, Chengdu 610065, China.

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Summary
This summary is machine-generated.

Active particle size, crowding, and chirality tune interactions between colloids. Simulations reveal transitions from repulsion to attraction, with chirality inducing oscillations in active depletion forces.

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Area of Science:

  • Soft matter physics
  • Statistical mechanics

Background:

  • Understanding interactions between particles is crucial in soft matter.
  • Active matter systems exhibit unique collective behaviors distinct from passive systems.

Purpose of the Study:

  • Investigate effective interactions between passive colloids in an active particle bath.
  • Explore the influence of active particle size, crowding-activity coupling, and chirality on these interactions.

Main Methods:

  • Utilized two-dimensional Langevin dynamics simulations.
  • Analyzed the effective forces acting on passive colloids.

Main Results:

  • Observed a transition from repulsive to attractive depletion forces by altering active particle size.
  • Demonstrated that increased volume fraction leads to a repulsion-to-attraction transition due to competing activity and crowding effects.
  • Discovered an oscillatory active depletion force in a chiral bath, varying with chirality.

Conclusions:

  • Active particle size, activity, and chirality offer tunable control over active depletion forces.
  • Findings suggest strategies for manipulating colloidal interactions in active environments.