Magnetically induced orientation of mesochannels in mesoporous silica films at 30 Tesla

Yusuke Yamauchi, Makoto Sawada, Masaki Komatsu, Atsushi Sugiyama, Tetsuya Osaka, Noriyuki Hirota, Yoshio Sakka, Kazuyuki Kuroda

Research output: Contribution to journalArticle

47 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1505-1512
Number of pages8
JournalChemistry - An Asian Journal
Volume2
Issue number12
DOIs
Publication statusPublished - 2007 Dec 17

Keywords

  • High magnetic fields
  • Magnetically induced orientation
  • Mesoporous materials
  • Silicates
  • Thin films

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry

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