Structured Surfaces for a Giant Liquid Slip

Choongyeop Lee, Chang-Hwan Choi, and Chang-Jin “CJ” Kim
Phys. Rev. Lett. 101, 064501 – Published 5 August 2008
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Abstract

We study experimentally how two key geometric parameters (pitch and gas fraction) of textured hydrophobic surfaces affect liquid slip. The two are independently controlled on precisely fabricated microstructures of posts and grates, and the slip length of water on each sample is measured using a rheometer system. The slip length increases linearly with the pitch but dramatically with the gas fraction above 90%, the latter trend being more pronounced on posts than on grates. Once the surfaces are designed for very large slips (>20μm), however, further increase is not obtained in regular practice because the meniscus loses its stability. By developing near-perfect samples that delay the transition from a dewetted (Cassie) to a wetted (Wenzel) state until near the theoretical limit, we achieve giant slip lengths, as large as 185μm.

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  • Received 10 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.064501

©2008 American Physical Society

Authors & Affiliations

Choongyeop Lee1, Chang-Hwan Choi2, and Chang-Jin “CJ” Kim1

  • 1Mechanical and Aerospace Engineering Department, University of California, Los Angeles (UCLA), California 90095, USA
  • 2Department of Mechanical Engineering, Stevens Institute of Technology, New Jersey 07030, USA

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Issue

Vol. 101, Iss. 6 — 8 August 2008

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