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Materials 2017, 10(3), 254; doi:10.3390/ma10030254

Wettability and Contact Time on a Biomimetic Superhydrophobic Surface

1
Key Laboratory of Bionic Engineering (Ministry of Education, China), Jilin University, Changchun 130025, China
2
State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China
3
School of Mechatronical Engineering, Changchun University of Science and Technology, Changchun 130022, China
*
Author to whom correspondence should be addressed.
Academic Editor: Xu Deng
Received: 15 December 2016 / Revised: 27 February 2017 / Accepted: 28 February 2017 / Published: 2 March 2017
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Abstract

Inspired by the array microstructure of natural superhydrophobic surfaces (lotus leaf and cicada wing), an array microstructure was successfully constructed by high speed wire electrical discharge machining (HS-WEDM) on the surfaces of a 7075 aluminum alloy without any chemical treatment. The artificial surfaces had a high apparent contact angle of 153° ± 1° with a contact angle hysteresis less than 5° and showed a good superhydrophobic property. Wettability, contact time, and the corresponding superhydrophobic mechanism of artificial superhydrophobic surface were investigated. The results indicated that the micro-scale array microstructure was an important factor for the superhydrophobic surface, while different array microstructures exhibited different effects on the wettability and contact time of the artificial superhydrophobic surface. The length (L), interval (S), and height (H) of the array microstructure are the main influential factors on the wettability and contact time. The order of importance of these factors is H > S > L for increasing the apparent contact angle and reducing the contact time. The method, using HS-WEDM to fabricate superhydrophobic surface, is simple, low-cost, and environmentally friendly and can easily control the wettability and contact time on the artificial surfaces by changing the array microstructure. View Full-Text
Keywords: wettability; array microstructure; apparent contact time; superhydrophobic; biomimetic wettability; array microstructure; apparent contact time; superhydrophobic; biomimetic
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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

Liang, Y.; Peng, J.; Li, X.; Huang, J.; Qiu, R.; Zhang, Z.; Ren, L. Wettability and Contact Time on a Biomimetic Superhydrophobic Surface. Materials 2017, 10, 254.

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