TEM observation of hydrogen permeable Si-M-O (M = Ni or Sc) membranes synthesized on mesoporous anodic alumina capillary tubes
- 74 Downloads
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.
KeywordsNickel Transmission Electron Microscopy Heat Treatment Processing Technique Capillary Tube
Unable to display preview. Download preview PDF.
- 1.H. M. Van Veen, M. Bracht, E. Hamoen and P. T. Alderliesten, in “Inorganic Membrane Science and Technology, Membrane Science and Technology Series,” edited by A. J. Burgraaf and L. Cot (Elsevier, Amsterdam, 1996) Vol 4, p. 641.Google Scholar
- 6.S. Kitao, H. Kameda and M. Asaeda, Membrane 15(4) (1990) 222.Google Scholar
- 10.B. N. Nair, T. Okubo and S.-I. Nakao, Membrane 25 (2003) 73.Google Scholar
- 16.M. Nomura, K. Ono, S. Gopalakrishnan, T. Sugawara and S.-I. Nakao, ibid. (in press).Google Scholar
- 17.Y. H. Ikuhara, H. Mori, Y. Iwamoto, N. Uno, S. Yamazaki and T. Saito, J. Mater. Res. (submitted).Google Scholar
- 18.H. Mori, T. Inada and Y. Iwamoto, JP patent 2004-090662.Google Scholar
- 19.M. Asaeda and M. Kashimoto, in Proceedings of the Fifth International Conference Inorganic Membranes (Nagoya, 1998) p. A-405.Google Scholar
- 22.T. Ohnishi, H. Koike, T. Ishitani, S. Tomimatsu, K. Umemura and T. Kamino, in Proceedings of the 25th International Symposium for Testing and Failure Analysis (Santa Clara, November 1999) p. 449.Google Scholar