Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Characterization of Type-VI Silica by Sol-Gel Method

졸-겔법을 이용한 Tape-VI형 실리카 에어로겔의 제조 및 특성분석

  • 김성철 (연세대학교 세라믹공학과) ;
  • 최대원 (연세대학교 세라믹공학과) ;
  • 최용수 (연세대학교 세라믹공학과) ;
  • 이종혁 (삼성전관 기초연구소) ;
  • 이해욱 (가야대학교 공학부 세라믹공학과) ;
  • 김창은 (연세대학교 세라믹공학과)
  • Published : 1998.03.01
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Abstract

The effect of catalytic condition on the properties of SiO2 aerogels has been investigated and then the dri-ed aerogels were partially densified to induce mechanical strength by heat treatment in order to prepare Type-VI silica by Sol-Gel method. Aerogel made by 1-step base process had the highest skeletal density lowest shrinkage and the smallest particle size. But in case of using acid catalyst in both 1st and 2nd step had the lowest skeletal density highest shrinkage and the largest particle size The aerogel synthesized by 1-step base process was most transparent because of its homogeneous microstructure. During heat treatments cracks occurred below 200$^{\circ}C$ for aerogel with the skeletal density lower than 1.9 g/cm3 but the with the higher skeletal density did not cracked up to 800$^{\circ}C$ shrinkage and skeletal density increased as heating temperature increased due to condensation and viscous sintering mechanism.

Keywords

References

  1. J. Non-Cryst. Sol. v.5 Properties and Structural of Vitreous Silica Br ckner R.
  2. Journal of Sol-Gel Science and Technology v.6 Drying and Sintering of Sol-Gel Derived Large SiO₂Monoliths Kirkbir F.;Murata H.;Meyers D.;Sarkar A.
  3. Multifunctional Materials 878 Gel-Silica Optics Hench L.L.;Wang S.h.;Nogues J.L.;Robert L.(ed.);Gunshor(ed.)
  4. J. Non-Cryst. Sol. v.121 Processing of Gel-silica Monoliths for Optics Hench L.L.;Wilson M.J.R.
  5. Sol-Gel Optics Ⅱ Micro-optical Arrays by Laser Densification of Gel-Silica Matrices Chia T.;Hench L.L.;J.D. Mackenzie
  6. J .Am. Ceram. Soc. v.71 no.12 Nogues J.L.;Majewski S.;Walker J.K.;Bowen M.;Wojcik R.;Moreshead M.V.
  7. Sol-Gel Optics Gel-Silica Hybrid Optics West J.K.;Zhu B.F.;Hench L.L.;Ochoa R.;J.D. Mackenzie(ed.);D.R. Ulrich(ed.)
  8. Ceramic Transactions, 19 Advanced Composite Materials Optical Composites Hench L.L.;M.D. Sacks
  9. Nature v.127 no.741 Kistler S.S.
  10. Sol-Gel Optics Large Silica Monolith S. Ray Chaudhuri;Amab Sarkar
  11. The Chemistry of Silica R.K. Iler
  12. Sol-Gel Science C. Jeffrey Brinker;George W. Scherer
  13. Langmuir v.5 R.H. Ottewill
  14. Science of Ceramic Chemical Processing R.H. Heistand Ⅱ;Y. Oguri;H. Okamura;H.K. Bowen;L.L. Hench(ed.);D.R. Ulrich(ed.)
  15. Sol-Gel Science C. Jeffrey Brinker;Geroge W. Scherer
  16. Phys. Rev. Lett. v.47 no.1400 T.A. Witten;L.M. Sander
  17. Better Ceramics Through Chemistry Ⅱ K.D. Keefer;L.L. Hench(ed.);D.R. Ulich(ed.)
  18. Silica aerogel process modeling and Experimental Investigation Kevin Daniel Lofftus
  19. Relaxation in Glasses and Composite G.W. Scherer