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Bouncing, chasing or pausing: asymmetric collisions of active droplets

Abstract : Chemically-active droplets exhibit complex avoiding trajectories. While heterogeneity is inevitable in active matter experiments, it is mostly overlooked in their modelling. Exploiting its geometric simplicity, we fully-resolve the head-on collision of two swimming droplets of different radii and demonstrate that even a small contrast in size critically conditions their collision and subsequent dynamics. We identify three fundamentally-different regimes. The resulting high sensitivity of pairwise collisions is expected to profoundly affect their collective dynamics.
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Submitted on : Wednesday, April 8, 2020 - 12:42:59 PM
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Kevin Lippera, Michael Benzaquen, Sébastien Michelin. Bouncing, chasing or pausing: asymmetric collisions of active droplets. Physical Review Fluids, American Physical Society, 2020, 5 (3), ⟨10.1103/PhysRevFluids.5.032201⟩. ⟨hal-02536806⟩

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