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Constraint dependence of active depletion forces on passive particles
Physical Review Letters ( IF 9.227 ) Pub Date : 
Peng Liu, Simin Ye, Fangfu Ye, Ke Chen, and Mingcheng Yang

Using simulations and experiments, we demonstrate that the effective interaction between passive particles in an active bath substantially depends on external constraint suffered by the passive particles. Particularly, the effective interaction between two free passive particles, which is directly measured in simulation, is qualitatively different from the one between two fixed particles. Moreover, we find that the friction experienced by the passive particles – a kinematic constraint – similarly influences the effective interaction. These remarkable features are in significant contrast to the equilibrium cases, and mainly arise from the accumulation of the active particles near the concave gap formed by the passive spheres. This constraint dependence not only deepens our understanding of the "active depletion force", but also provides an additional tool to tune the effective interactions in an active bath.
更新日期:2020-03-26

 

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