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25 Jun 2012

Volume 100, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 100, 261104 (2012); http://dx.doi.org/10.1063/1.4711253 (4 pages)

Marcelo Davanço, Jun Rong Ong, Andrea Bahgat Shehata, Alberto Tosi, Imad Agha, Solomon Assefa, Fengnian Xia, William M. J. Green, Shayan Mookherjea, and Kartik Srinivasan
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Biotemplated hierarchical surfaces and the role of dual length scales on the repellency of impacting droplets

Matthew McCarthy, Konstantinos Gerasopoulos, Ryan Enright, James N. Culver, Reza Ghodssi, and Evelyn N. Wang

Appl. Phys. Lett. 100, 263701 (2012); http://dx.doi.org/10.1063/1.4729935 (5 pages) | Cited 1 time

Online Publication Date: 28 June 2012

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We fabricated biomimetic hierarchical superhydrophobic surfaces using the Tobacco mosaic virus and investigated the role of each length scale during droplet impact by decomposing the micro and nanoscale components. We found that 10 μl water droplets rebounded at impact velocities greater than 4.3 m/s on the hierarchical surfaces, outperforming the nanostructured surfaces, which underwent an observable wetting transition at an impact velocity of 2.7 m/s. This finding demonstrates that each length scale plays a distinct, but complementary, role in maximizing water repellency during droplet impact and, thus, provides insight into the evolutionary development of highly water-repellant hierarchical plant leaves.
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47.55.dr Interactions with surfaces
68.08.Bc Wetting
87.17.-d Cell processes
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