4.7 Article

Collective dynamics and rheology of confined phoretic suspensions

Journal

JOURNAL OF FLUID MECHANICS
Volume 943, Issue -, Pages -

Publisher

CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2022.366

Keywords

collective behaviour; active matter

Funding

  1. European Research Council (ERC) under the European Union [714027]
  2. European Research Council (ERC) [714027] Funding Source: European Research Council (ERC)

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By studying autochemotactic Janus particles, this research reveals the effects of flow and chemical induction, as well as the influence of confinement, on collective behavior.
Similarly to their biological counterparts, suspensions of chemically active autophoretic swimmers exhibit a non-trivial dynamics involving self-organisation processes as a result of inter-particle interactions. Using a kinetic model for a dilute suspension of autochemotactic Janus particles, we analyse the effect of a confined pressure-driven flow on these collective behaviours and the impact of chemotactic aggregation on the effective viscosity of the active fluid. Four dynamic regimes are identified when increasing the strength of the imposed pressure-driven flow, each associated with a different collective behaviour resulting from the competition of flow- and chemically induced reorientation of the swimmers together with the constraints of confinement. Interestingly, we observe that the effect of the pusher (respectively puller) hydrodynamic signature, which is known to reduce (respectively increase) the effective viscosity of a sheared suspension, is inverted upon the emergence of autochemotactic aggregation. Our results provide new insights into the role of the collective dynamics in complex environments, which are relevant to synthetic as well as biological systems.

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