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Type: Journal article
Title: Massive amplification of surface-induced transport at superhydrophobic surfaces
Author: Huang, D.
Cottin-Bizonne, C.
Ybert, C.
Bocquet, L.
Citation: Physical Review Letters, 2008; 101(6):1-4
Publisher: American Physical Soc
Issue Date: 2008
ISSN: 0031-9007
Statement of
David M. Huang, Cécile Cottin-Bizonne, Christophe Ybert, and Lydéric Bocquet
Abstract: We study electro- and diffusio-osmosis of aqueous electrolytes at superhydrophobic surfaces by means of computer simulation and hydrodynamic theory. We demonstrate that the diffusio-osmotic flow at superhydrophobic surfaces can be amplified by more than 3 orders of magnitude relative to flow in channels with a zero interfacial slip. By contrast, little enhancement is observed at these surfaces for electro-osmotic flow. This amplification for diffusio-osmosis is due to the combined effects of enhanced slip and ion surface depletion or excess at the air-water interfaces on superhydrophobic surfaces. This effect is interpreted in terms of capillary driven Marangoni motion. A practical microfluidic pumping device is sketched on the basis of the slip-enhanced diffusio-osmosis at a superhydrophobic surface.
Rights: ©2008 American Physical Society
DOI: 10.1103/PhysRevLett.101.064503
Appears in Collections:Aurora harvest
Chemistry and Physics publications

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