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Article Dans Une Revue Physical Review E Année : 2023

Ostwald-like ripening in the two-dimensional clustering of passive particles induced by swimming bacteria

J. Bouvard
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F. Moisy
H. Auradou

Résumé

Clustering passive particles by active agents is a promising route for fabrication of colloidal structures. Here, we report the dynamic clustering of micrometric beads in a suspension of motile bacteria. We characterize the coarsening dynamics for various bead sizes, surface fractions and bacterial concentrations. We show that the time scale τ for the onset of clustering is governed by the time of first encounter of diffusing beads. At large time (t sim τ ), we observe a robust cluster growth as t^1/3, similar to the Ostwald ripening mechanism. From bead tracking measurements, we extract the short-range bacteria-induced attractive force at the origin of this clustering.
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Dates et versions

hal-04303819 , version 1 (12-01-2024)

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J. Bouvard, F. Moisy, H. Auradou. Ostwald-like ripening in the two-dimensional clustering of passive particles induced by swimming bacteria. Physical Review E , 2023, 107 (4), pp.044607. ⟨10.1103/PhysRevE.107.044607⟩. ⟨hal-04303819⟩
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