Slippage of water past superhydrophobic carbon nanotube forests in microchannels

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 micro-PIV (Particule 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.

under review

References in corpus (1)

• Comment on ``Large Slip of Aqueous Liquid Flow over a Nanoengineered Superhydrophobic Surface'' by C-H Choi and C Kim

Cited by in corpus (20)

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• Effective slip boundary conditions for flows over nanoscale chemical heterogeneities
• Evidence of thin-film precursors formation in hydrokinetic and atomistic simulations of nano-channel capillary filling
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• Giant Slip at Liquid-Liquid Interfaces Using Hydrophobic Ball Bearings
• How does an external electric field trigger the Cassie-Baxter-Wenzel wetting transition on a textured surface?
• The Activation Energy for Wall Slip
• Slip effects in polymer thin films