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

超亲水性 阳极氧化 接触角 材料科学 氧化物 蒸发 复合材料 多孔性 冶金 热力学 物理
作者
Daiki Nakajima,Tatsuya Kikuchi,Taiki Yoshioka,Hisayoshi Matsushima,Mikito Ueda,Ryosuke O. Suzuki,Shungo Natsui
出处
期刊:Materials [Multidisciplinary Digital Publishing Institute]
卷期号:12 (21): 3497-3497 被引量:24
标识
DOI:10.3390/ma12213497
摘要

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°, and superhydrophilic behavior with the lowest contact angle measuring 2.0° 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°, 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.
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