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Fabrication of anodic porous alumina via galvanostatic anodizing in alkaline sodium tetraborate solution and their morphology

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Title: Fabrication of anodic porous alumina via galvanostatic anodizing in alkaline sodium tetraborate solution and their morphology
Authors: Kikuchi, Tatsuya Browse this author →KAKEN DB
Kunimoto, Kaito Browse this author
Ikeda, Hiroki Browse this author
Nakajima, Daiki Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Natsui, Shungo Browse this author →KAKEN DB
Keywords: Aluminum
Porous alumina
Sodium tetraborate
Issue Date: 1-Aug-2019
Publisher: Elsevier
Journal Title: Journal of electroanalytical chemistry
Volume: 846
Start Page: 113152
Publisher DOI: 10.1016/j.jelechem.2019.05.034
Abstract: The anodizing of aluminum in an alkaline sodium tetraborate (Na2B4O7) solution was investigated with respect to the nanostructural characterization of anodic porous alumina. Electropolished aluminum specimens were galvanostatically anodized under various conditions in 0.1-0.5 M sodium tetraborate solutions at 293-353 K and a current density of 2.5-400 A m(-2). Anodic oxide with numerous flower-like defects was formed by anodizing in a 0.1 M Na2B4O7 solution due to the film breakdown with continuous visible sparking. On the other hand, a uniform porous alumina film without any breakdown was successfully obtained by anodizing a more concentrated solution than 0.3 M at 333 K. The anodic oxide was almost pure alumina and consisted of a thin outer layer with numerous small pits and a thick inner layer with typical porous alumina cells. The pore walls possessed continuous bumpy surfaces measuring 10-20 nm in roughness. As the temperature further increased to 353 K, the regularity of the porous alumina improved due to the high current density of more than 150 A m(-2) during anodizing. Slippery superhydrophobic and sticky superoleophobic aluminum surfaces could be easily fabricated via high temperature anodizing and subsequent self-assembled monolayer modification.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
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)

Submitter: 菊地 竜也

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