The sol-gel preparation and characterization of nanoporous silica membrane with controlled pore size

Tomoyuki Fujii, Toshimasa Yano, Kozo Nakamura, Osato Miyawaki

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

A thin nanoporous silica membrane was prepared by the two-step sol-gel method. First, silica membrane was formed onto the α-alumina support as an intermediate layer with fibrous silica colloid. Then, silica nanoparticles were deposited on the first layer of silica membrane surface again by the sol-gel method. It is generally found that gelation process, as liquid evaporates during drying, begins with the formation of fractal aggregates. Since an aggregate having the higher fractal dimension has the more complex void space than the aggregate having the lower fractal dimension, the silica nanoparticle concentration in the coating solution for the second step modification was selected low enough to avoid the aggregates with the higher fractal dimension. Thus, the prepared membrane had a dense skin layer with a nanospace as interparticle void space, which was proved by the AFM surface image analysis and the result from nitrogen adsorption porosimetry.

Original languageEnglish
Pages (from-to)171-180
Number of pages10
JournalJournal of Membrane Science
Volume187
Issue number1-2
DOIs
Publication statusPublished - 2001 Jun 15
Externally publishedYes

Keywords

  • Atomic force microscopy
  • Dynamic light scattering
  • Fractal
  • Sol-gel method
  • Surface topography

ASJC Scopus subject areas

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

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