Slippage of water past superhydrophobic carbon nanotube forests in microchannels

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 necessa...

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Published in:Physical review letters 2006-10, Vol.97 (15), p.156104-156104, Article 156104
Main Authors: Joseph, P, Cottin-Bizonne, C, Benoît, J-M, Ybert, C, Journet, C, Tabeling, P, Bocquet, L
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Language:English
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Condensed Matter
Fluid Dynamics
Physics
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cited_by cdi_FETCH-LOGICAL-c393t-16665860716b849d33fbb12bd0f66d9a4448e6e8fa5a952e5256edb009b6a74c3
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container_issue 15
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container_title Physical review letters
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creator Joseph, P
Cottin-Bizonne, C
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description 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.
doi_str_mv 10.1103/PhysRevLett.97.156104
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subjects Condensed Matter
Fluid Dynamics
Physics
title Slippage of water past superhydrophobic carbon nanotube forests in microchannels
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