Preparation and structure of microporous silica membranes

Balagopal N. Nair, J.W. Elferink, K. Keizer, H. Verweij

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)
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Silica sols have been prepared in an alcoholic solution by hydrolysis and condensation of TEOS (tetra-ethyl-ortho-silicate) molecules as a function of water and nitric acid concentration. The polymers are intended as precursors for ceramic, gas separation membranes. These molecules show fractal behavior as determined by SAXS (Small Angle X-ray Scattering). Microporosity of dried and calcined silica polymers is determined by N2-adsorption at 77 K. Fractal dimension and porosity increase with increasing acid concentration. Both the sol structure and the drying kinetics determine the porosity values. N2-adsorption isotherms are not very suitable for the determination of pore size distributions of microporous silica.
Original languageEnglish
Pages (from-to)471-475
Number of pages5
JournalJournal of sol-gel science and technology
Issue number1-3
Publication statusPublished - 1997


  • Polymeric sol
  • Microporous silica
  • Membranes
  • N2-adsorption
  • Fractals


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