Slippage of water past superhydrophobic carbon nanotube forests in microchannels

被引:384
|
作者
Joseph, P.
Cottin-Bizonne, C.
Benoit, J. -M.
Ybert, C.
Journet, C.
Tabeling, P.
Bocquet, L. [1 ]
机构
[1] Univ Lyon 1, CNRS, UMR 5586, Lab PMCN, F-69622 Villeurbanne, France
[2] ESPCI, CNRS, UMR 7083, F-75231 Paris, France
关键词
D O I
10.1103/PhysRevLett.97.156104
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present in this Letter an experimental characterization of liquid flow slippage over superhydrophobic surfaces made of carbon nanotube forests, incorporated in microchannels. We make use of a particle image velocimetry technique to achieve the submicrometric resolution on the flow profile necessary for accurate measurement of the surface hydrodynamic properties. We demonstrate boundary slippage on the Cassie superhydrophobic state, associated with slip lengths of a few microns, while a vanishing slip length is found in the Wenzel state when the liquid impregnates the surface. Varying the lateral roughness scale L of our carbon nanotube forest-based superhydrophobic surfaces, we demonstrate that the slip length varies linearly with L in line with theoretical predictions for slippage on patterned surfaces.
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页数:4
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