Dynamic clustering of passive colloids in dense suspensions of motile bacteria

Abstract

Mixtures of active and passive particles are predicted to exhibit a variety of nonequilibrium phases. Here we report a dynamic clustering phase in mixtures of colloids and motile bacteria. We show that colloidal clustering results from a balance between bond breaking due to persistent active motion and bond stabilization due to torques that align active particle velocity tangentially to the passive particle surface. Furthermore, dynamic clustering spans a broad regime between diffusivity-based and motility-induced phase separation that subsumes typical bacterial motility parameters.

arXiv comment16 pages, 16 figures

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Cited by in corpus (5)

• Phase Separation Driven by Active Flows
• Ostwald-like ripening in the two-dimensional clustering of passive particles induced by swimming bacteria
• Phase Ordering in Binary Mixtures of Active Nematic Fluids
• Transient Pattern Formation in an Active Matter Contact Poisoning Model
• Self-organised structures in mixed active-passive suspensions due to hydrodynamic interactions