One-step modification method to fabricate wettability patterns on aluminium substrate

Huanxi Zheng; Shuai Huang; Jiyu Liu; Faze Chen; Xiaolong Yang; Xin Liu; Jing Sun; Wenji Xu

One-step modification method to fabricate wettability patterns on aluminium substrate

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Author(s): Huanxi Zheng ¹ ; Shuai Huang ¹ ; Jiyu Liu ¹ ; Faze Chen ¹ ; Xiaolong Yang ¹ ; Xin Liu ¹ ; Jing Sun ¹ ; Wenji Xu ¹
- Affiliations: 1: School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
Source: Volume 11, Issue 11, November 2016, p. 697 – 701
DOI: 10.1049/mnl.2016.0187 , Online ISSN 1750-0443

Received 13/04/2016, Accepted 29/06/2016, Revised 27/06/2016, Published 01/11/2016

Since there is currently no method to selectively fabricate superhydrophobic regions on superhydrophilic surfaces of metal substrates, wettability patterns on metal substrates are prepared via the three-step technique including superhydrophilic, superhydrophobic and selectively superhydrophilic modifications. Here, an innovative method that can selectively lower surface energy of superhydrophilic surfaces, and thereby makes it more convenient to fabricate the wettability patterns, is proposed. Chemical etching is used to formulate micro/nanoscale rough structures and fabricate superhydrophilic aluminium (Al) surface, which is then covered by patterned mask whose main composition is siloxane. Removing the mask after 80°C water bath heating for 20 s, the covered Al surface has been modified to become superhydrophobic (contact angles >165°, sliding angles <1.5°), while the uncovered region is still superhydrophilic, and wettability patterns are therefore obtained. Fourier transform infrared spectrophotometer and Raman spectra indicate that the change of wettability is induced by hydrophobic groups on the modified surfaces. The superhydrophobic surfaces fabricated by this method have excellent high-temperature resistance. The method proposed is simple, rapid and environmental-friendly.

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One-step modification method to fabricate wettability patterns on aluminium substrate

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