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Applied Physics Letters / Volume 96 / Issue 26 / INTERDISCIPLINARY AND GENERAL PHYSICS

Appl. Phys. Lett. 96, 264101 (2010); http://dx.doi.org/10.1063/1.3456391 (3 pages)

Droplet actuation on a liquid layer due to thermocapillary motion: Shape effect

Ehsan Yakhshi-Tafti1, Hyoung J. Cho1,2, and Ranganathan Kumar1

1University of Central Florida, Orlando, Florida 32816, USA
2Sungkyunkwan University, Jangan-Gu, Suwon, Gyeonggi-Do 440-746, Korea

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(Received 13 February 2010; accepted 28 May 2010; published online 30 June 2010)

In the thermocapillary migration of droplets on the free surface of immiscible liquids, we observe that the lens-shaped drops move from warm toward cooler regions while spherical drops move in the opposite direction. We explain this dual behavior using an analysis of surface deformation and velocity profiles of thin liquid layers subject to a lateral thermal gradient. Liquid platforms allow thermocapillary transport of drops with higher migration speeds than solid substrates and lower internal temperature fluctuation. Such conditions may be exploited in biochemical microsystems where droplet evaporation, contamination, and surface pinning need to be avoided.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

capillarity, drops

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3456391

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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