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Biomimetics 2017, 2(1), 1; doi:10.3390/biomimetics2010001

Plasma-Textured Teflon: Repulsion in Air of Water Droplets and Drag Reduction Underwater

1
Department of Mechanics, Mathematics and Management, Politecnico di Bari, v.le Japigia 182, 70126 Bari, Italy
2
Department of Civil and Environmental Engineering and Chemistry, Politecnico di Bari, via Orabona 4, 70126 Bari, Italy
3
CNR-NANOTEC, via Orabona 4, 70126 Bari, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Josep Samitier
Received: 6 December 2016 / Revised: 17 January 2017 / Accepted: 17 January 2017 / Published: 23 January 2017
(This article belongs to the Special Issue Micro- and Nano-Structured Bio-Inspired Surfaces)
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Abstract

A superhydrophobic behavior can be obtained by properly modifying the surface topography of Teflon or other fluorinated polymers having an inherent hydrophobic character. According to this strategy, we have micro/nanotextured Teflon both as plane material (sheets) and as three-dimensional (3D) object (spheres) with a single step plasma process. The obtained textured Teflon samples were compared with those made of pristine Teflon in air, in terms of repulsion of impacting water droplets, and underwater, in terms of air layer behavior under static and dynamic conditions. The latter case was investigated by subjecting the spheres to a vertical fall in water. Modified surfaces present nanofilaments on the top of micrometric vertical structures, which can increase the air retaining capacity, resulting in a biomimicry effect due to a similarity with the Salvinia molesta leaf. On this surface, repulsion of impacting water droplets can be as fast as previously reached only on heated solids. Also, the air layer over the modified spheres underwater is shown to play a role in the observed reduction of hydrodynamic drag onto the moving object. View Full-Text
Keywords: Teflon; Salvinia; superhydrophobic; air-retaining; drop impact; air plastron; drag reduction Teflon; Salvinia; superhydrophobic; air-retaining; drop impact; air plastron; drag reduction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Di Mundo, R.; Bottiglione, F.; Notarnicola, M.; Palumbo, F.; Pascazio, G. Plasma-Textured Teflon: Repulsion in Air of Water Droplets and Drag Reduction Underwater. Biomimetics 2017, 2, 1.

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