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

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Cited by in corpus (49)

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• Traces of surfactants can severely limit the drag reduction of superhydrophobic surfaces
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• Electro-osmosis on anisotropic super-hydrophobic surfaces
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• Random-roughness hydrodynamic boundary conditions
• Tensorial slip of super-hydrophobic channels
• Texture-induced modulations of friction force: the fingerprint effect
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• Dynamics of a sphere with inhomogeneous slip boundary conditions in Stokes flow
• Molecular diffusion and slip boundary conditions at smooth surfaces with periodic and random nanoscale textures
• Exit time distribution in spherically symmetric two-dimensional domains
• The friction of a mesh-like super-hydrophobic surface
• Stable antiferromagnetic graphone
• 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
• Scaling laws for slippage on superhydrophobic fractal surfaces
• Near-wall hydrodynamic slip triggers swimming state transition of microorganisms
• Simulation of fluid flow in hydrophobic rough microchannels
• Nanometer-Resolved Collective Micromeniscus Oscillations through Optical Diffraction
• Anisotropic flow in striped superhydrophobic channels
• Effective slip-length tensor for a flow over weakly slipping stripes
• Flow past superhydrophobic surfaces with cosine variation in local slip length
• Hydrodynamic interaction with super-hydrophobic surfaces
• Rheological study of polymer flow past rough surfaces with slip boundary conditions
• Wall-bounded flow over a realistically rough superhydrophobic surface
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• Flow in channels with superhydrophobic trapezoidal textures
• Achieving large zeta-potentials with charged porous surfaces
• The rolling and slipping of droplets on superhydrophobic surfaces
• Giant Slip at Liquid-Liquid Interfaces Using Hydrophobic Ball Bearings
• Hydrokinetic simulations of nanoscopic precursor films in rough channels
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• Giant slip lengths of a simple fluid at vibrating solid interfaces
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• Porous Superhydrophobic Membranes: Hydrodynamic Anomaly in Oscillating Flows
• Slip effects in polymer thin films
• The Activation Energy for Wall Slip