Journal
CHEMISTRY-AN ASIAN JOURNAL
Volume 2, Issue 12, Pages 1505-1512Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.200700244
Keywords
high magnetic fields; magnetically induced orientation; mesoporous materials; silicates; thin films
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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. Hexade-cyltrimethylammonium 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.
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