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Magnetically Induced Orientation of Mesochannels in Mesoporous Silica Films at 30 Tesla
Author(s) -
Yamauchi Yusuke,
Sawada Makoto,
Komatsu Masaki,
Sugiyama Atsushi,
Osaka Tetsuya,
Hirota Noriyuki,
Sakka Yoshio,
Kuroda Kazuyuki
Publication year - 2007
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200700244
Subject(s) - pulmonary surfactant , mesoporous silica , chemical engineering , mesoporous material , materials science , magnetic field , chemistry , nanotechnology , organic chemistry , physics , catalysis , quantum mechanics , engineering
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.