Defect dynamics in clusters of self-propelled rods in circular confinement

Wang, Zhengjia; Si, Tieyan; Hao, Junhua; Guan, Yu; Qin, Feng; Yang, Bin; Cao, Wenwu

doi:10.1140/epje/i2019-11911-y

Cited by 6 publications

(6 citation statements)

References 67 publications

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“…The motion of topological defects for HP is driven by the active push by the surrounding SPRs. The Brownian motion of the 1/2 defect core on the circular boundary is suppressed by the increasing active stress under increasing self-propelled force F a , the diffusivity of defect core decreases with increasing F a [39].…”

Section: Results and Discussion -mentioning

confidence: 95%

“…First, the weak activity (small F a ) is considered. In the previous study, it is found that SPRs spontaneously organize into a steady vortex in circular confinement with the rods concentrating at the circular boundary for intermediate concentration, long rod length, and weak activity [39]. Here the parameters for a steady VP in circular confinement are adopted.…”

Section: Results and Discussion -mentioning

confidence: 99%

“…Therefore the SPRs have a high probability to accumulate near the boundary surface, even though fluctuating torques on boundary also randomly reorients the SPR away from the boundary [30,31]. When active particles slide along the boundary in a collective order, usually a vortex pattern (VP) shows up in the circular confinement [32][33][34][35][36][37][38][39][40]. Further study reveals that the combined effect of polar alignment and the collision lead to the global pattern in circular confinement.…”

mentioning

confidence: 98%

“…The HP remains steady as the activity is large enough. The generation and annihilation of different topological defects for SPRs in circular confinement rely on the critical rod length, rod concentration, and self-propelled force [39].…”

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confidence: 99%

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Defect dynamics for self-propelled rods in a doublet of circular confinement

Wang¹,

Hao²,

Xu³

et al. 2020

EPL

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Rod-shaped active micro/nano-particles, such as bacterial and bipolar metallic micro/ nano-motors, exhibit emergent collective phenomena far from equilibrium state compared to passive particles. We apply a simulation approach —dissipative particle dynamics (DPD)— to explore the collectively ordered states of self-propelled rods (SPRs) which rely on the defect dynamics in the rod cluster. The SPRs are confined in a doublet of circular confinement and repel each other when two rods touch each other. When the rod flow in the connecting passage of the circles is suppressed, namely the small passage width, the steady vortex pattern is obtained in the two circles for weak activity. In binary-passage system, long single-passage system, and short single-passage system, ferromagnetic vortices (FMV), uncorrelated vortices (UV), and anti-ferromagnetic vortices (AFMV) can be obtained, respectively. For intermediate activity, a regular periodic oscillation of the rod number n r in one circle can be seen clearly. For strong activity, mixing of high- and low-frequency oscillation is observed. The amplitude of the rod current in the passage I p follows the relation , where F a denotes the self-propelled force.

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Section: Results and Discussion -mentioning

confidence: 95%

Section: Results and Discussion -mentioning

confidence: 99%

mentioning

confidence: 98%

mentioning

confidence: 99%

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Defect dynamics for self-propelled rods in a doublet of circular confinement

Wang¹,

Hao²,

Xu³

et al. 2020

EPL

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“…44 The SPRs sliding along the boundary inevitably collide with each other; thereby, a hedgehog cluster with 1/2 topological defect is created at the boundary. [45][46][47][48] As a result, the detention of the cluster at the corner of the channel impairs the particle transport efficiency in the asymmetric periodic channel. 49 It is revealed that rod-like passive particles have a great capacity in the biomedical field.…”

Section: Introductionmentioning

confidence: 99%