Aggregate morphology of active Brownian particles on porous, circular walls

Abstract

We study the motility-induced aggregation of active Brownian particles (ABPs) on a porous, circular wall. We observe that the morphology of aggregated dense-phase on a static wall depends on the wall porosity, particle motility, and the radius of the circular wall. Our analysis reveals two morphologically distinct, dense aggregates; a connected dense cluster that spreads uniformly on the circular wall and a localized cluster that breaks the rotational symmetry of the system. These distinct morphological states are similar to the macroscopic structures observed in aggregates on planar, porous walls. We systematically analyze the parameter regimes where the different morphological states are observed. We further extend our analysis to motile circular rings. We show that the motile ring propels almost ballistically due to the force applied by the active particles when they form a localized cluster, whereas it moves diffusively when the active particles form a continuous cluster. This property demonstrates the possibility of extracting useful work from a system of ABPs, even without artificially breaking the rotational symmetry.

arXiv comment10 pages, 10 figures

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Cited by in corpus (8)

• Effect of polydispersity on the dynamics of active Brownian particles
• Activity-controlled clogging and unclogging of micro-channels
• Influence of interaction softness in phase separation of active particles
• Active particles with polar alignment in ring-shaped confinement
• Active Matter Shepherding and Clustering in Inhomogeneous Environments
• Collective dynamics of active dumbbells near a circular obstacle
• Active wetting transitions induced by rotational noise at solid interfaces
• Percolation transitions in the binary mixture of active Brownian particles with different softness