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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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