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Control of morphology and surface wettability of anodic niobium oxide microcones formed in hot phosphate-glycerol electrolytes
| 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 | | Superhydrophobicity |
| 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) |
| URI: | http://hdl.handle.net/2115/47358 |
| 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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Submitter: 幅崎 浩樹
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