Active particle in a very thin interfacial droplet
arXiv:2501.09652 · doi:10.1103/882l-mzr2
Abstract
A single light-driven Janus particle confined in a very thin oil droplet at an air--water interface displays intriguing dynamics. While laser activation induces rapid horizontal motion (1mm/s--1cm/s) by thermal Marangoni flow, the particle exhibits unexpected periodic circular motions or intermittent irregular motions. We show that the periodic trajectories are the result of a coupling between the self-propulsion of the particle and the spatiotemporal droplet thickness changes. We propose a simple model where the properties of the active particle trajectories are governed by capillary forces and torques due to the confinement of the particle in the thin droplet.
7 pages, 4 figures; supplementary information: 11 pages, 10 figures, 5 videos
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