期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.144503
关键词
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资金
- National Science Foundation's CBET programme on Particulate and Multiphase Processes [1804241]
- US Army Research Office through the Institute for Soldier Nanotechnologies at MIT [W911NF-13-D-0001]
- Feodor Lynen Fellowship of the Alexander von Humboldt Foundation
- European Research Council [853619]
- Vannevar Bush Faculty Fellowship [N000141812878]
- German Research Foundation (DFG) [ZE1121/1-1]
- DFG Emmy Noether grant [ZE1121/3-1]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1804241] Funding Source: National Science Foundation
- European Research Council (ERC) [853619] Funding Source: European Research Council (ERC)
The article presents a mechanism for controlling droplet orientation using optically induced thermal gradients to generate interfacial tension differential, resulting in Marangoni flows and a net torque for predictable and controllable reorientation. This optothermally induced Marangoni dynamics offer a promising mechanism for controlling droplet-based micro-optical components in small thermal gradients.
Microscale Janus emulsions represent a versatile material platform for dynamic refractive, reflective, and light-emitting optical components. Here, we present a mechanism for droplet actuation that exploits thermocapillarity. Using optically induced thermal gradients, an interfacial tension differential is generated across the surfactant-free internal capillary interface of Janus droplets. The interfacial tension differential causes droplet-internal Marangoni flows and a net torque, resulting in a predictable and controllable reorientation of the droplets. The effect can be quantitatively described with a simple model that balances gravitational and thermal torques. Occurring in small thermal gradients, these optothermally induced Marangoni dynamics represent a promising mechanism for controlling droplet-based micro-optical components.
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