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Journal Articles Nature Communications Year : 2024

How to steer active colloids up a vertical wall

Abstract

An important challenge in active matter lies in harnessing useful global work from entities that produce work locally, e.g., via self-propulsion. We investigate here the active matter version of a classical capillary rise effect, by considering a non-phase separated sediment of self-propelled Janus colloids in contact with a vertical wall. We provide experimental evidence of an unexpected and dynamic adsorption layer at the wall. Additionally, we develop a complementary numerical model that recapitulates the experimental observations. We show that an adhesive and aligning wall enhances the pre-existing polarity heterogeneity within the bulk, enabling polar active particles to climb up a wall against gravity, effectively powering a global flux. Such steady-state flux has no equivalent in a passive wetting layer.
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Dates and versions

hal-04282487 , version 1 (13-11-2023)
hal-04282487 , version 2 (07-03-2024)

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Adérito Fins Carreira, Adam Wysocki, Christophe Ybert, Mathieu Leocmach, Heiko Rieger, et al.. How to steer active colloids up a vertical wall. Nature Communications, 2024, 15, pp.1710. ⟨10.1038/s41467-024-45872-1⟩. ⟨hal-04282487v2⟩
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