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Magnetically Induced Orientation of Mesochannels in Mesoporous Silica Films at 30 Tesla |
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| Authors: | Yusuke Yamauchi Dr. Makoto Sawada Masaki Komatsu Atsushi Sugiyama Prof. Tetsuya Osaka Prof. Noriyuki Hirota Dr. Yoshio Sakka Prof. Kazuyuki Kuroda Prof. |
| Affiliation: | 1. International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), Tsukuba‐shi, Ibaraki 305‐0044, Japan, Fax: (+81)?29‐860‐4706;2. Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Shinjuku‐ku, Tokyo 169‐0051, Japan;3. Department of Applied Chemistry and Majors in Applied Chemistry and Nanoscience and Nanoengineering, Waseda University, Shinjuku‐ku, Tokyo 169‐8555, Japan;4. Waseda Institute for Advanced Study, Waseda University, Shinjuku‐ku, Tokyo 169‐8050, Japan;5. Nano Ceramics Center, National Institute for Materials Science (NIMS), Tsukuba‐shi, Ibaraki 305‐0047, Japan;6. CREST, Japan Science and Technology Agency, Kawaguchi‐shi, Saitama 332‐0012, Japan |
| Abstract: | We demonstrate the magnetically induced orientation of mesochannels in mesoporous silica films prepared with low‐molecular‐weight surfactants under an extremely high magnetic field of 30 T. This process is principally applicable to any type of surfactant that has magnetic anisotropy because such a high magnetic field provides sufficient magnetic energy for smooth magnetic orientation. Hexadecyltrimethylammonium bromide (CTAB) and polyoxyethylene‐10‐cetyl ether (Brij 56) were used as cationic and nonionic surfactants, respectively. According to XRD and cross‐sectional TEM, mesochannels aligned perpendicular to the substrates were observed in films prepared with low‐molecular‐weight surfactants, although the effect was incomplete. The evolution of these types of films should lead to future applications such as highly sensitive chemical sensors and selective separation. |
| Keywords: | high magnetic fields magnetically induced orientation mesoporous materials silicates thin films |