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Control of morphology and surface wettability of anodic niobium oxide microcones formed in hot phosphate-glycerol electrolytes

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Title: Control of morphology and surface wettability of anodic niobium oxide microcones formed in hot phosphate-glycerol electrolytes
Authors: Yang, Shu Browse this author
Habazaki, Hiroki Browse this author →KAKEN DB
Fujii, Takashi Browse this author
Aoki, Yoshitaka Browse this author
Skeldon, Peter Browse this author
Thompson, George E. Browse this author
Keywords: Anodizing
Nanoporous oxide
Hierarchical surface
Issue Date: 1-Sep-2011
Publisher: Elsevier
Journal Title: Electrochimica Acta
Volume: 56
Issue: 22
Start Page: 7446
End Page: 7453
Publisher DOI: 10.1016/j.electacta.2011.07.005
Abstract: We report the fabrication of superhydrophobic surfaces with a hierarchical morphology by self-organized anodizing process. Simply by anodizing of niobium metal in hot phosphate-glycerol electrolyte, niobium oxide microcones, consisting of highly branched oxide nanofibers, develop on the surface. The size of the microcones and their tip angles are controlled by changing the applied potential difference in anodizing and the water content in the electrolyte. Reduction of the water content increases the size of the microcones, with the nanofibers changing to nanoparticles. The size of microcones is also reduced by increasing the applied potential difference, without influencing the tip angle. The hierarchical oxide surfaces are superhydrophilic, with static contact angles close to 0°. Coating of the anodic oxide films with a monolayer of fluoroalkyl phosphate makes the surfaces superhydrophobic with a contact angle for water as high as 175° and a very small contact angle hysteresis of only 2°. The present results indicate that the larger microcones with smaller tip angles show the higher contact angle for water.
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: 幅崎 浩樹

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