Magnetically induced orientation of mesochannels in mesoporous silica films at 30 tesla.
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.
Yamauchi
Yusuke
Y
International Center for Young Scientists, National Institute for Materials Science, Tsukuba-shi, Ibaraki 305-0044, Japan. YAMAUCHI.Yusuke@nims.go.jp
Sawada
Makoto
M
Komatsu
Masaki
M
Sugiyama
Atsushi
A
Osaka
Tetsuya
T
Hirota
Noriyuki
N
Sakka
Yoshio
Y
Kuroda
Kazuyuki
K