Effect of self-propulsion on equilibrium clustering

被引:39
作者
Mani, Ethayaraja [1 ]
Loewen, Hartmut [2 ]
机构
[1] Indian Inst Technol, Dept Chem Engn, Polymer Engn & Colloid Sci Lab, Madras 600036, Tamil Nadu, India
[2] Univ Dusseldorf, Inst Theoret Phys Weiche Materie 2, D-40225 Dusseldorf, Germany
来源
PHYSICAL REVIEW E | 2015年 / 92卷 / 03期
基金
欧洲研究理事会;
关键词
ACTIVE BROWNIAN PARTICLES; PHASE-SEPARATION; HYDRODYNAMICS; BEHAVIOR; COLLOIDS; MOTION;
D O I
10.1103/PhysRevE.92.032301
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
In equilibrium, colloidal suspensions governed by short-range attractive and long-range repulsive interactions form thermodynamically stable clusters. Using Brownian dynamics computer simulations, we investigate how this equilibrium clustering is affected when such particles are self-propelled. We find that the clustering process is stable under self-propulsion. For the range of interaction parameters studied and at low particle density, the cluster size increases with the speed of self-propulsion (activity) and for higher activity the cluster size decreases, showing a nonmonotonic variation of cluster size with activity. This clustering behavior is distinct from the pure kinetic (or motility-induced) clustering of self-propelling particles which is observed at significantly higher activities and densities. We present an equilibrium model incorporating the effect of activity as activity-induced attraction and repulsion by imposing that the strength of these interactions depend on activity superlinearly. The model explains the cluster size dependence of activity obtained from simulations semiquantitatively. Our predictions are verifiable in experiments on interacting synthetic colloidal microswimmers.
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页数:7
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