Active particle in a very thin interfacial droplet
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911177205874688 |
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| author | Kato, Airi N. Xie, Kaili Gorin, Benjamin Rampnoux, Jean-Michel Kellay, Hamid |
| author_facet | Kato, Airi N. Xie, Kaili Gorin, Benjamin Rampnoux, Jean-Michel Kellay, Hamid |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_09652 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Active particle in a very thin interfacial droplet Kato, Airi N. Xie, Kaili Gorin, Benjamin Rampnoux, Jean-Michel Kellay, Hamid Soft Condensed Matter 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. |
| title | Active particle in a very thin interfacial droplet |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2501.09652 |