Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers
Although anodization is an essential technology that has supported the aluminum industry for nearly a century, the atomistic structure of the formed alumina films has not completely understood. Here we used NMR spectroscopy to clarify the factors affecting local structure of anodic porous alumina fi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-01-01
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| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379722007987 |
| _version_ | 1797950713551126528 |
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| author | Hideki Hashimoto Yuki Fujita Koji Yazawa Hidetaka Asoh |
| author_facet | Hideki Hashimoto Yuki Fujita Koji Yazawa Hidetaka Asoh |
| author_sort | Hideki Hashimoto |
| collection | DOAJ |
| description | Although anodization is an essential technology that has supported the aluminum industry for nearly a century, the atomistic structure of the formed alumina films has not completely understood. Here we used NMR spectroscopy to clarify the factors affecting local structure of anodic porous alumina films prepared under various electrolytic conditions. For anion-free amorphous alumina films prepared using chromic acid, the local structure does not depend on electrolytic factors. For films prepared using phosphoric acid, the average coordination number was lower than that of anion-free alumina. On the other hand, films prepared using oxalic and sulfuric acids showed the average coordination numbers higher than that of anion-free alumina. We reveal that aluminum coordination number of anodic porous alumina are affected by anion species and anion content. In addition, the depth of anion incorporation into cell walls, or compositional uniformity, is quite important for accurate interpretation of NMR spectra. |
| first_indexed | 2024-04-10T22:19:32Z |
| format | Article |
| id | doaj.art-26b738d987ee4643a822b8878c424148 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-10T22:19:32Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-26b738d987ee4643a822b8878c4241482023-01-18T04:30:41ZengElsevierResults in Physics2211-37972023-01-0144106177Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbersHideki Hashimoto0Yuki Fujita1Koji Yazawa2Hidetaka Asoh3Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan; Corresponding author.Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, JapanJEOL RESONANCE Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, JapanDepartment of Applied Chemistry, School of Advanced Engineering, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, JapanAlthough anodization is an essential technology that has supported the aluminum industry for nearly a century, the atomistic structure of the formed alumina films has not completely understood. Here we used NMR spectroscopy to clarify the factors affecting local structure of anodic porous alumina films prepared under various electrolytic conditions. For anion-free amorphous alumina films prepared using chromic acid, the local structure does not depend on electrolytic factors. For films prepared using phosphoric acid, the average coordination number was lower than that of anion-free alumina. On the other hand, films prepared using oxalic and sulfuric acids showed the average coordination numbers higher than that of anion-free alumina. We reveal that aluminum coordination number of anodic porous alumina are affected by anion species and anion content. In addition, the depth of anion incorporation into cell walls, or compositional uniformity, is quite important for accurate interpretation of NMR spectra.http://www.sciencedirect.com/science/article/pii/S2211379722007987Amorphous aluminaAnodic porous aluminaAnion incorporationSolid-state NMRCoordination number |
| spellingShingle | Hideki Hashimoto Yuki Fujita Koji Yazawa Hidetaka Asoh Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers Results in Physics Amorphous alumina Anodic porous alumina Anion incorporation Solid-state NMR Coordination number |
| title | Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers |
| title_full | Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers |
| title_fullStr | Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers |
| title_full_unstemmed | Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers |
| title_short | Effects of anion incorporation on the local structure of porous-type amorphous alumina prepared by anodization: NMR study of Al coordination numbers |
| title_sort | effects of anion incorporation on the local structure of porous type amorphous alumina prepared by anodization nmr study of al coordination numbers |
| topic | Amorphous alumina Anodic porous alumina Anion incorporation Solid-state NMR Coordination number |
| url | http://www.sciencedirect.com/science/article/pii/S2211379722007987 |
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