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A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

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Title: A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid
Authors: Nakajima, Daiki Browse this author
Kikuchi, Tatsuya Browse this author →KAKEN DB
Yoshioka, Taiki Browse this author
Matsushima, Hisayoshi Browse this author →KAKEN DB
Ueda, Mikito Browse this author →KAKEN DB
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Natsui, Shungo Browse this author
Keywords: aluminum
anodizing
pyrophosphoric acid
superhydrophilicity
alumina nanofiber
Issue Date: Nov-2019
Publisher: MDPI
Journal Title: Materials
Volume: 12
Issue: 21
Start Page: 3497
Publisher DOI: 10.3390/ma12213497
Abstract: A superhydrophilic aluminum surface with fast water evaporation based on nanostructured aluminum oxide was fabricated via anodizing in pyrophosphoric acid. Anodizing aluminum in pyrophosphoric acid caused the successive formation of a barrier oxide film, a porous oxide film, pyramidal bundle structures with alumina nanofibers, and completely bent nanofibers. During the water contact angle measurements at 1 s after the water droplet was placed on the anodized surface, the contact angle rapidly decreased to less than 10 degrees, and superhydrophilic behavior with the lowest contact angle measuring 2.0 degrees was exhibited on the surface covered with the pyramidal bundle structures. As the measurement time of the contact angle decreased to 200-33 ms after the water placement, although the contact angle slightly increased in the initial stage due to the formation of porous alumina, at 33 ms after the water placement, the contact angle was 9.8 degrees, indicating that superhydrophilicity with fast water evaporation was successfully obtained on the surface covered with the pyramidal bundle structures. We found that the shape of the pyramidal bundle structures was maintained in water without separation by in situ high-speed atomic force microscopy measurements.
Rights: https://creativecommons.org/licenses/by/4.0/
Type: article
URI: http://hdl.handle.net/2115/76617
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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