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Langmuir. 2006 Jul 4;22(14):6161-7.

Directing droplets using microstructured surfaces.

Author information

1
Department of Electrical Engineering, University of Washington, Seattle, Washington 98195, USA. ashutosh@washington.edu

Abstract

Systematic variation of microscale structures has been employed to create a rough superhydrophobic surface with a contact angle gradient. Droplets are propelled down these gradients, overcoming contact angle hysteresis using energy supplied by mechanical vibration. The rough hydrophobic surfaces have been designed to maintain air traps beneath the droplet by stabilizing its Fakir state. Dimensions and spacing of the microfabricated pillars in silicon control the solid-liquid contact area and are varied to create a gradient in the apparent contact angle. This work introduces the solid-liquid contact area fraction as a new control variable in any scheme of manipulating droplets, presenting theory, fabricated structures, and experimental results that validate the approach.

PMID:
16800671
DOI:
10.1021/la0601657
[Indexed for MEDLINE]
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