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Open AccessArticle

Patternable Poly(chloro-p-xylylene) Film with Tunable Surface Wettability Prepared by Temperature and Humidity Treatment on a Polydimethylsiloxane/Silica Coating

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State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
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Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics, Chengdu 610207, China
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Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, China
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Authors to whom correspondence should be addressed.
Materials 2018, 11(4), 486; https://doi.org/10.3390/ma11040486
Received: 17 January 2018 / Revised: 13 March 2018 / Accepted: 19 March 2018 / Published: 23 March 2018
(This article belongs to the Section Smart Materials)
Poly(chloro-p-xylylene) (PPXC) film has a water contact angle (WCA) of only about 84°. It is necessary to improve its hydrophobicity to prevent liquid water droplets from corroding or electrically shorting metallic circuits of semiconductor devices, sensors, microelectronics, and so on. Herein, we reported a facile approach to improve its surface hydrophobicity by varying surface pattern structures under different temperature and relative humidity (RH) conditions on a thermal curable polydimethylsiloxane (PDMS) and hydrophobic silica (SiO2) nanoparticle coating. Three distinct large-scale surface patterns were obtained mainly depending on the contents of SiO2 nanoparticles. The regularity of patterns was mainly controlled by the temperature and RH conditions. By changing the pattern structures, the surface wettability of PPXC film could be improved and its WCA was increased from 84° to 168°, displaying a superhydrophobic state. Meanwhile, it could be observed that water droplets on PPXC film with superhydrophobicity were transited from a “Wenzel” state to a “Cassie” state. The PPXC film with different surface patterns of 200 μm × 200 μm and the improved surface hydrophobicity showed wide application potentials in self-cleaning, electronic engineering, micro-contact printing, cell biology, and tissue engineering. View Full-Text
Keywords: Poly(chloro-p-xylylene); surface wettability; polydimethylsiloxane; silica nanoparticles; superhydrophobic coating Poly(chloro-p-xylylene); surface wettability; polydimethylsiloxane; silica nanoparticles; superhydrophobic coating
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MDPI and ACS Style

Yu, Y.; Shao, H.; He, Z.; Tang, C.; Yang, J.; Li, Y.; Wang, C.; Li, X.; Shuai, M.; Mei, J. Patternable Poly(chloro-p-xylylene) Film with Tunable Surface Wettability Prepared by Temperature and Humidity Treatment on a Polydimethylsiloxane/Silica Coating. Materials 2018, 11, 486.

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