This is not the latest version of this item. The latest version can be found here.
Actuation of Janus Emulsion Droplets via Optothermally Induced Marangoni Forces
Name
PhysRevLett.127.144503.pdf
Description
Published version
Size
3.11 MB
Format
Adobe PDF
Checksum (MD5)
8e58fc889120cd69f77303df8e27250b
Author(s)
Nagelberg, Sara
Totz, Jan F
Mittasch, Matthäus
Sresht, Vishnu
Zeininger, Lukas
Swager, Timothy M
Kreysing, Moritz
Kolle, Mathias
Date Issued
October 1, 2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Nagelberg, Sara, Totz, Jan F, Mittasch, Matthäus, Sresht, Vishnu, Zeininger, Lukas et al. 2021. "Actuation of Janus Emulsion Droplets via Optothermally Induced Marangoni Forces." Physical Review Letters, 127 (14).
Version
Final published version
Abstract
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.
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
10.1103/physrevlett.127.144503
