Dynamic clustering of passive colloids in dense suspensions of motile bacteria.
basic_science · Level V
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- Record sourced from PubMed, PMID 35706283.
- Also identified by DOI 10.1103/PhysRevE.105.054605.
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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.