Slippage of water past superhydrophobic carbon nanotube forests in microchannels

Details Slippage of water past superhydrophobic carbon nanotube forests in microchannels Slippage of water past superhydrophobic carbon nanotube forests in microchannels

2006-09-02

arxiv.org/abs/cond-mat/0609043v1

Phys. Rev. Lett. vol 97 art. 156104 (2006)

Physics

Condensed Matter

Soft Condensed Matter

under review

Scientific paper

10.1103/PhysRevLett.97.156104

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.

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