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Journal of Sol-Gel Science and Technology

, Volume 8, Issue 1–3, pp 177–181 | Cite as

The production of ultrafine silica powders from silicon tetrachloride: Control of the primary particle size

  • James R. Heley
  • David Jackson
  • Peter F. James
Article

Abstract

Ultra fine silica powders were prepared by hydrolysis of SiCl4 using aqueous ammonia solution followed by supercritical drying. Using different methods of combining the SiCl4 and ammonia solution, to vary the initial and final pH of the solution, large silica powders surface areas (271–905 m2/g), fine average particle diameters (3.5–17) nm and low tapping densities (0.02–0.05 g/cm2) could be prepared. Powders with characteristics similar to pyrogenic silica, and with similar thermal stability at temperatures up to 1000°C, could be produced.

Key words

silicon tetrachloride particle size silica aerogel powders 

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References

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    C.J. Brinker and G.W. Scherer,Sol-Gel Science, (Academic Press, London, 1990).Google Scholar
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    M.A. Butler and P.F. James,Topical Issues In Glass (Society of Glass Technology Lonsdale Press, London, England, 1993), Vol. 1, p. 59.Google Scholar
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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • James R. Heley
    • 1
  • David Jackson
    • 1
  • Peter F. James
    • 1
  1. 1.Department of Engineering MaterialsThe University of SheffieldSheffieldUK

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