Bioinspired Self-Repairing Slippery Surfaces with Pressure-Stable Omniphobicity

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Entry by Emily Redston, AP 226, Spring 2012

  • Work in progress*

Reference

Bioinspired self-repairing slippery surfaces with pressure-stable omniphobicity by T.S. Wong, S.H. Kang, S.K.Y. Tang, E.J. Smythe, B.D. Hatton, A. Grinthal, and J. Aizenberg. Nature 477, 443-447 (2011)

Keywords

omniphobicity, biomimetics, self-repair, surface texture,

Introduction

Results

Figure 1. Omniphobicity and high-pressure stability of SLIPS. a, Time-sequence images comparing mobility of pentane droplets ((γA= 517.260.5mN m-1, volume ~ 30 μl) on a SLIPS and a superhydrophobic, air-containing Teflon porous surface. Pentane is repelled on the SLIPS, but it wets and stains the traditional superhydrophobic surface. b, Comparison of contact angle hysteresis as a function of surface tension of test liquids (indicated) on SLIPS and on an omniphobic surface reported in ref. 9. In the inset, the advancing and receding contact angles of a liquid droplet are denoted as θadv, and θrec, respectively. SLIPS 1, 2 and 3 refer to the surfaces made of Teflon porous membrane (SLIPS 1), an array of epoxy posts of Pressure (atm) geometry 1 (pitch ~ 2 μm, height ~ 5 μm, post diameter ~ 300 nm) (SLIPS 2) and an array of epoxy posts of geometry 2 (pitch~900 nm, height~500 nm–2 μm, post diameter ~300 nm) (SLIPS 3). Error bars indicate standard deviations from three independent measurements. c, A plot showing the high pressure stability of SLIPS, as evident from the low sliding angle of a decane droplet (γA = 23.6 ± 0.1 mN m-1, volume ~ 3 μl) subjected to pressurized nitrogen gas in a pressure chamber. Error bars indicate standard deviations from at least seven independent measurements.

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