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Slippage of water past superhydrophobic carbon nanotube forests in microchannels | | P Joseph
; C Cottin-Bizonne
; J-M Benoît
; C Ybert
; C Journet
; P Tabeling
; L Bocquet
; | | Date: |
13 Oct 2006 | | Journal: | Phys Rev Lett, 97 (15), 156104 | | Abstract: | 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. | | Source: | PubMed, pmid17155344 | | Other source: | [GID 556225] cond-mat/0609043 | | Services: | Forum | Review | Favorites | |
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