Journal of Sol-Gel Science and Technology

, Volume 19, Issue 1, pp 495–499

Comparative Study of Structure of Silica Gels from Different Sources

  • Kanichi Kamiya
  • Ai Oka
  • Hiroyuki Nasu
  • Tadanori Hashimoto
Article

DOI: 10.1023/A:1008720118475

Cite this article as:
Kamiya, K., Oka, A., Nasu, H. et al. Journal of Sol-Gel Science and Technology (2000) 19: 495. doi:10.1023/A:1008720118475

Abstract

The medium-range-network structure of silicas from different sources was comparatively examined by X-ray diffraction, IR and NMR analyses. Silica gels made through the conventional sol-gel route were found to have a different structure from silica glass, and considered to be composed of 4-fold siloxane ring units, irrespective of preparation conditions. Amorphous silicas in rice-hulls and bamboo leaves showed structure data close to silica glass, being suggested to consist mainly of 6-fold siloxane ring units. The modified sol-gel method, in which siloxane oligomers containing cyclic siloxane tetramers may have been ring-opened and polymerized under the catalytic reaction of NaOH or NH4F in the water-free solution, provided the silica gel of which structure was very similar to silica glass.

sol-gel silicas biology X-ray diffraction IR NMR 

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Kanichi Kamiya
    • 1
  • Ai Oka
    • 1
  • Hiroyuki Nasu
    • 1
  • Tadanori Hashimoto
    • 1
  1. 1.Department of Chemistry for Materials, Faculty of EngineeringMie UniversityMie-kenJapan

Personalised recommendations