Chemical modification of carbon-coated anodic alumina films and their application to membrane filter

Takashi Kyotani, Wei Hua Xu, Yu Yokoyama, Junichi Inahara, Hidekazu Touhara, Akira Tomita

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

An anodic aluminum oxide film that has uniform and straight nanochannels was exposed to propylene at 800°C, resulting in uniform carbon deposition on the inner-surface of the channels as well as the external surface of the film. The carbon-coated aluminum oxide film was then chemically modified by either fluorination or HNO3 treatment. The change in channel structure due to the carbon deposition and the subsequent chemical modification was analyzed. Gas permeation behavior through these films was examined by using He and N2. Furthermore, the films were applied to pervaporation separation of water/ethanol mixture and it was found that water preferentially permeated the fluorinated film. The present study demonstrated that even a membrane whose pore size is as large as 24nm exhibits selectivity in pervaporation.

Original languageEnglish
Pages (from-to)231-239
Number of pages9
JournalJournal of Membrane Science
Volume196
Issue number2
DOIs
Publication statusPublished - 2002 Feb 28

Keywords

  • Anodic aluminum oxide film
  • Carbon coating
  • Chemical modification
  • Fluorination
  • Pervaporation

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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