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Microscale Marangoni Surfers

Dietrich, K; Jaensson, N; Buttinoni, I; Volpe, G; Isa, L; (2020) Microscale Marangoni Surfers. Physical Review Letters , 125 (9) , Article 098001. 10.1103/PhysRevLett.125.098001. Green open access

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Abstract

We apply laser light to induce the asymmetric heating of Janus colloids adsorbed at water-oil interfaces and realize active micrometric “Marangoni surfers.” The coupling of temperature and surfactant concentration gradients generates Marangoni stresses leading to self-propulsion. Particle velocities span 4 orders of magnitude, from microns/s to cm/s, depending on laser power and surfactant concentration. Experiments are rationalized by finite elements simulations, defining different propulsion regimes relative to the magnitude of the thermal and solutal Marangoni stress components.

Type: Article
Title: Microscale Marangoni Surfers
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.125.098001
Publisher version: https://doi.org/10.1103/PhysRevLett.125.098001
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10109786
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