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Phys Rev Lett. 2006 Feb 17;96(6):066001. Epub 2006 Feb 16.

Large slip of aqueous liquid flow over a nanoengineered superhydrophobic surface.

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1
Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095, USA. chchoi@ucla.edu

Abstract

While many recent studies have confirmed the existence of liquid slip over certain solid surfaces, there has not been a deliberate effort to design and fabricate a surface that would maximize the slip under practical conditions. Here, we have engineered a nanostructured superhydrophobic surface that minimizes the liquid-solid contact area so that the liquid flows predominantly over a layer of air. Measured through a cone-and-plate rheometer system, the surface has demonstrated dramatic slip effects: a slip length of approximately 20 microm for water flow and approximately 50 microm for 30 wt % glycerin. The essential geometrical characteristics lie with the nanoposts populated on the surface: tall and slender (i.e., needlelike) profile and submicron periodicity (i.e., pitch).

PMID:
16606011
DOI:
10.1103/PhysRevLett.96.066001
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