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Journal of Sol-Gel Science and Technology

, Volume 13, Issue 1–3, pp 189–193 | Cite as

Sol-Gel Formation of Reticular Methyl-Silicate Materials by Hydrogen Peroxide Decomposition

  • J. Gun
  • O. Lev
  • O. Regev
  • S. Pevzner
  • A. Kucernak
Article

Abstract

A new method for the formation of reticular silicate and organically modified silicate is introduced. Monoliths were prepared by incorporating a few percent hydrogen peroxide in the sol-gel starting solution. For example, incorporation of 6–10% (v) hydrogen peroxide in base catalyzed sol-gel precursors of methyl-Ormosil yielded macroporous monoliths with a bi-modal pore size distribution. The average characteristic pore diameters were approximately 1.2 nm and 0.7 μm, depending on the sol-gel precursors used and the preparation protocol. The specific surface area was approximately 160 m2/g, contributed mainly by the microporous structure. A similar preparation procedure without hydrogen peroxide yielded only fractured or powdery materials. Presumably, the decomposition of the hydrogen peroxide yielded microbubbles, which formed templates for the polycondensation reaction. SEM, nitrogen adsorption isotherms and small angle X-ray spectroscopy were used to characterize the reticular materials.

chromatography foams macroreticular 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • J. Gun
    • 1
  • O. Lev
    • 1
  • O. Regev
    • 2
  • S. Pevzner
    • 2
  • A. Kucernak
    • 3
  1. 1.Fredy and Nadine Herrmann School of Applied ScienceThe Hebrew University of JerusalemJerusalemIsrael
  2. 2.Chemical Engineering DepartmentBen Gurion University of NegevBeer ShevaIsrael
  3. 3.Department of ChemistryImperial College of Science, Technology and MedicineLondonUK

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