Phys. Rev. Lett. 96, 066001 (2006) [4 pages]

Large Slip of Aqueous Liquid Flow over a Nanoengineered Superhydrophobic Surface

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Chang-Hwan Choi^* and Chang-Jin Kim
Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095, USA

Received 14 September 2005; published 16 February 2006

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 ∼20 μm for water flow and ∼50 μm 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).

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.96.066001

DOI:

10.1103/PhysRevLett.96.066001

PACS:

83.50.Rp, 47.45.Gx, 68.08.Bc, 81.40.Pq

^*To whom correspondence should be addressed.

Electronic address: chchoi@ucla.edu

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Phys. Rev. Lett. 96, 066001 (2006) [4 pages]

Large Slip of Aqueous Liquid Flow over a Nanoengineered Superhydrophobic Surface

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