Journal of Materials Science

, Volume 41, Issue 9, pp 2679–2683 | Cite as

TEM observation of hydrogen permeable Si-M-O (M = Ni or Sc) membranes synthesized on mesoporous anodic alumina capillary tubes

  • S. Yamazaki
  • N. Uno
  • H. Mori
  • Y. H. Ikuhara
  • Y. Iwamoto
  • T. Kato
  • T. Hirayama

Microstructures of Si-M-O (M = Ni or Sc; M/Si = 0.5) membranes synthesized on a mesoporous anodic alumina capillary (MAAC) tube using chemical processing techniques were characterized by transmission electron microscopy. The chemical composition of the membranes was analyzed by energy-dispersive X-ray spectroscopy. An as-synthesized Si-Ni-O membrane was found to be formed as a thin amorphous layer with a thickness of 400 nm on the MAAC tube, and in the mesopore channels of the MAAC tube, amorphous Si-Ni-O was also formed. The EDS analysis indicated a compositional gradient of Ni/Si for the Si-Ni-O membrane. The ratio of Ni/Si increased the further in depth from the surface of the membrane. After heat treatment in a hydrogen flow, a multilayered structure was formed, and nickel and nickel oxides were precipitated in the membrane. In the Si-Sc-O membrane, neither precipitation nor compositional gradient of Sc/Si were observed. The compositional change and precipitating behaviors of the Si-Ni-O and Si-Sc-O membrane are discussed in terms of the stability of the silica-dopant metal network and the hydrogen permselectivity of the membranes.


Nickel Transmission Electron Microscopy Heat Treatment Processing Technique Capillary Tube 
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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • S. Yamazaki
    • 1
    • 2
  • N. Uno
    • 1
  • H. Mori
    • 1
  • Y. H. Ikuhara
    • 1
  • Y. Iwamoto
    • 1
  • T. Kato
    • 1
  • T. Hirayama
    • 1
  1. 1.Materials R&D LaboratoryJapan Fine Ceramics CenterNagoyaJapan
  2. 2.Materials Research LaboratoryNGK Insulators, Ltd.NagoyaJapan

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