Microscale Marangoni Surfers.
- Dietrich K Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.
- Jaensson N Laboratory for Soft Materials, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.
- Buttinoni I Institut für Experimentelle Kolloidphysik, Heinrich-Heine Universität Düsseldorf, D-40225 Düsseldorf, Germany.
- Volpe G Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom.
- Isa L Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland.
- 2020-09-11
Published in:
- Physical review letters. - 2020
English
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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.125.098001
- PMID 32915612
- Persistent URL
- https://sonar.ch/global/documents/288502
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