A simple fabrication method for mechanically robust superhydrophobic surface by hierarchical aluminum hydroxide structures |
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Authors: | Handong Cho Dongseob Kim Changwoo Lee Woonbong Hwang |
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Institution: | 1. Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Pohang, Kyungbuk 790-784, Republic of Korea;2. Graduate School of Engineering Masterships, Pohang University of Science and Technology, San 31, Pohang, Kyungbuk 790-784, Republic of Korea |
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Abstract: | Superhydrophobic surfaces with uniformly superhydrophobic surface where nano-scale structures were fabricated by alkali surface modification method and self-assembled monolayer coating. To enhance mechanical durability of the superhydrophobicity, we propose the fabrication process for dual-scale hierarchical structures combining both microstructure via sandblasting techniques and the nanostructured aluminum hydroxide layer. The superhydrophobic surfaces fabricated by both methods exhibited a high water contact angle and very low contact angle hysteresis. By forming the hierarchical structure, the mechanical durability of superhydrophobic aluminum hydroxide surface was improved. The resulting hierarchical structures are suitable for diverse applications of aluminum in various industrial areas, including self-cleaning, anti-frosting, and microfluidic devices for rigorous environments. |
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