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Manipulation of the Superhydrophobicity of Plasma-Etched Polymer Nanostructures

1
Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA
2
Department of Chemistry, University of California-Berkeley, Berkeley, CA 94720, USA
3
Northrop Grumman Mission Systems, Advanced Technology Labs, Linthicum, MD 21090, USA
*
Author to whom correspondence should be addressed.
Micromachines 2018, 9(6), 304; https://doi.org/10.3390/mi9060304
Received: 15 May 2018 / Revised: 11 June 2018 / Accepted: 15 June 2018 / Published: 18 June 2018
(This article belongs to the Special Issue Plasma-Based Surface Engineering)
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Abstract

The manipulation of droplet mobility on a nanotextured surface by oxygen plasma is demonstrated by modulating the modes of hydrophobic coatings and controlling the hierarchy of nanostructures. The spin-coating of polytetrafluoroethylene (PTFE) allows for heterogeneous hydrophobization of the high-aspect-ratio nanostructures and provides the nanostructured surface with “sticky hydrophobicity”, whereas the self-assembled monolayer coating of perfluorodecyltrichlorosilane (FDTS) results in homogeneous hydrophobization and “slippery superhydrophobicity”. While the high droplet adhesion (stickiness) on a nanostructured surface with the spin-coating of PTFE is maintained, the droplet contact angle is enhanced by creating hierarchical nanostructures via the combination of oxygen plasma etching with laser interference lithography to achieve “sticky superhydrophobicity”. Similarly, the droplet mobility on a slippery nanostructured surface with the self-assembled monolayer coating of FDTS is also enhanced by employing the hierarchical nanostructures to achieve “slippery superhydrophobicity” with modulated slipperiness. View Full-Text
Keywords: polymer; plasma etching; nanostructures; droplet mobility; superhydrophobicity polymer; plasma etching; nanostructures; droplet mobility; superhydrophobicity
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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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Du, K.; Jiang, Y.; Liu, Y.; Wathuthanthri, I.; Choi, C.-H. Manipulation of the Superhydrophobicity of Plasma-Etched Polymer Nanostructures. Micromachines 2018, 9, 304.

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