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Open AccessArticle

Development of Hybrid Surfaces with Tunable Wettability by Selective Surface Modifications

by Hyun-Joong Lee 1 and Keun Park 2,*
1
Graduate School of Mechanical Design and Robot Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
2
Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Chang-Hwan Choi
Materials 2016, 9(3), 136; https://doi.org/10.3390/ma9030136
Received: 18 January 2016 / Revised: 19 February 2016 / Accepted: 22 February 2016 / Published: 26 February 2016
(This article belongs to the Special Issue Superhydrophobicity of Materials)
Recent advances in micro/nano technology have driven artificial modifications of surface wettability by mimicking biological surfaces, such as superhydrophobic and water-harvesting surfaces. In this study, surface wettability of polycarbonate (PC) films was modified using various surface treatments: micropatterning using ultrasonic imprint lithography, fluorinate silane coating, and electron beam irradiation. To modify surface wettability selectively in a specified region, these three treatments were performed using profiled masks with the corresponding shapes. Various combinations of these treatments were investigated in terms of wettability changes, by measuring contact angle (CA). The semi-hydrophobic PC film (CA: 89.2°) was modified to create a super- hydrophobic state (CA: 155.9°) by virtue of the selective micropatterning and coating. The electron beam irradiation had an opposite effect, reducing the CA (48.2°), so that the irradiated region was modified to create a hydrophilic state. Two combinations of the proposed surface modifications made it possible to have a great difference in CA on a single surface (107.7°), and to have four different wetting states on a single surface. Various water-drop experiments proved that the developed hybrid surfaces were selectively wettable and showed water-collecting capability. View Full-Text
Keywords: wettability; superhydrophobic; hydrophilic; ultrasonic imprinting; electron beam; water collection; micropattern wettability; superhydrophobic; hydrophilic; ultrasonic imprinting; electron beam; water collection; micropattern
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Lee, H.-J.; Park, K. Development of Hybrid Surfaces with Tunable Wettability by Selective Surface Modifications. Materials 2016, 9, 136.

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