Leidenfrost liquid droplets on micro/nano ratchets

Document Type

Conference Proceeding

Publication Date

1-1-2008

Abstract

Ratchets provide directionality in the motion of matter. We report motion of liq-uid droplets in the Leidenfrost regime whose directionality is rectified by topological ratchets. Topologically ratcheted gratings with the period ranging from millimeter down to sub-micrometer were fabricated using micromachining techniques. Water droplets dispensed on the ratcheted gratings start to move in a direction perpendicu-lar to the gratings when the surface temperature reaches the Leidenfrost temperature. At relatively low temperature ranges above the Leidenfrost temperature, the average velocity of water droplet motion increases exponentially as the period of the ratchets decreases. At the high temperature ranges, the velocity does not depend on the ratchet size any more, maintaining a constant value of a few cm/s.

Publication Source (Journal or Book title)

12th International Conference on Miniaturized Systems for Chemistry and Life Sciences - The Proceedings of MicroTAS 2008 Conference

First Page

1672

Last Page

1674

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