Directing Droplets Using Microstructured Surfaces

Directing Droplets Using Microstructured Surfaces

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 hav...

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Veröffentlicht in:Langmuir 2006-07, Vol.22 (14), p.6161-6167
Hauptverfasser: Shastry, Ashutosh, Case, Marianne J, Böhringer, Karl F
Format: Artikel
Sprache:eng
Schlagworte:
Chemistry
Exact sciences and technology
General and physical chemistry
Hydrophobic and Hydrophilic Interactions
Models, Chemical
Phase Transition
Vibration
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container_title Langmuir
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creator Shastry, Ashutosh
Case, Marianne J
Böhringer, Karl F
description 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.
doi_str_mv 10.1021/la0601657
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subjects Chemistry
Exact sciences and technology
General and physical chemistry
Hydrophobic and Hydrophilic Interactions
Models, Chemical
Phase Transition
Vibration
title Directing Droplets Using Microstructured Surfaces
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