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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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Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095, USA.


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).

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