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Depletion forces on circular and elliptical obstacles induced by active matter
L R Leite1,2, D Lucena2, F Q Potiguar3
1Universidade da Integração Internacional da Lusofonia Afro-Brasileira, Campus dos Palmares, 62785-000 Acarape, Ceará, Brazil.
Physical Review. E
|January 14, 2017
Summary
A bath of active particles can exert forces on passive objects, influencing their movement. The shape and orientation of these objects determine whether the forces are repulsive or attractive, with implications for particle self-propulsion dynamics.
Area of Science:
- Soft matter physics
- Statistical mechanics
- Active matter systems
Background:
- Self-propelled particles create unique dynamic environments.
- Interactions between active and passive particles are crucial for understanding emergent behaviors.
Purpose of the Study:
- To investigate depletion forces exerted by self-propelled particles on passive objects.
- To analyze the influence of passive object shape and orientation on these forces.
Main Methods:
- Numerical simulations were employed to model particle interactions.
- System parameters included object shape (circular, elliptical), orientation, angular noise, and inter-object distance.
Main Results:
- Active particle baths can induce both repulsive and attractive forces on passive objects.
- Forces are sensitive to the passive object's shape and orientation (horizontal vs. vertical ellipses).
- Repulsive forces increase with distance up to one active particle diameter, then decrease.
Conclusions:
- The shape and orientation of passive objects significantly dictate force interactions in active particle systems.
- Attractive forces can emerge for specific configurations (vertical ellipses) under certain conditions (high area fraction).
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