Optical Transparency and Microstructure of $TiO_2-SiO_2$ Binary Aerogels

$TiO_2-SiO_2$ 이성분계 Aerogel의 광학적 투명성과 미세구조

  • 이종혁 (연세대학교 세라믹공학과) ;
  • 최수영 (연세대학교 세라믹공학과) ;
  • 김창은 (연세대학교 세라믹공학과) ;
  • 김구대 (한국과학기술원 세라믹스연구부) ;
  • 이해욱 (가야요업대학 전자세라믹공학과)
  • Published : 1995.03.01

Abstract

Homogeneous and monolithic TiO2-SiO2 binary aerogels were prepared by supercritical drying. Optical transparency was increased with adding acid catalyst during two step hydrolysis and with decreasing water content. These differences in optical transparency were related to microstructures of gel network formed through polycondensation reaction during supercritical drying process, rather than the final composition of aerogel.

Keywords

References

  1. Better Ceramics Through Chemistry Ⅱ. Difference between Gel-derived Melts and those Produced by Batch Melting A.R. Cooper;C.J. Brinker(ed.);D.E. Clark(ed.);D.R. Ulrich(ed.)
  2. J. Non-Cryst. Solids v.100 Attempts to Avoid Cracks During Drying T. Mizuno;H. Hagata;S. Manabe
  3. J. Am. Ceram. Soc. v.75 no.8 Aerogels J. Fricke;A. Emmerling
  4. Structure and Bonding 77: Chemistry, Spectroscopy and Applications of Sol-Gel Glasses Aerogels, Preparation, Properties, Applications J. Fricke;A. Emmerling;R. Reisfeld(ed.);C.K. J$\"{o}$rgensen(ed.)
  5. Chem. Rev. v.89 Aerogels and Related Porous Materials H.D. Gesser;P.C. Goswami
  6. J. Mat. Sci. v.25 Glasses from Aerogels T. Woignier;J. Phalippou;M. Prassas
  7. J. Non-Cryst. Solids v.86 Comparison of Ethyl versus Methyl Sol-Gels for Silica Aerogels Using Polar Nephelometry R.E. Russo;A.J. Hunt
  8. UD Patent 4,610,863 Process for Forming Transparent Aerogel Insulating Arrays P.H. Tewari;A.J. Hunt
  9. Aerogels;Springer Proc. Phys. v.6 Preparation, Densification and Characterization of Autoclave Dried SiO₂ Gels C.A.M. Mulder;J.G. van Lierop;J. Fricke(ed.)
  10. J. Sol-Gel Sci. and Tech. v.2 Ultra-low Expansion Glass from Gels R.D. Shoup
  11. Sol-Gel Optics v.1328 Sol-Gel Derived Gradient Index Optical Materials T.M. Che;J.B. Caldwell;R.M. Mininni;J.D. Mackenzie(ed.);D.R. Ulrich(ed.)
  12. Electronic Letters v.22 no.21 r-GRIN TiO₂-SiO₂ Glass Rods Prepared by Sol-Gel Method K. Shingyouchi;S. Konishi;K. Susa;I. Matsuyama
  13. J. Mat. Sci. v.18 Preparation of Titania-Silica Glasses by the Gel Method T. Hayashi;T. Yamada;H. Saito
  14. J. Non-Cryst. Solids v.104 Preparation of Monolithic SiO₂-TiO₂ Gels by Condensation Polymerization of Silicic Acid and Titanium Chelates Y. Abe;N. Sugimoto;Y. Nagao;T. Misono
  15. Better Ceramics Through Chemistry Ⅲ. Structural Investigation of the Hydrolysis-Condensation Process of a Modified Titanium Alkoxide F. Babonneau;A. Leaustic;J. Livage;C.J. Brinker(ed.);D.E. Clark(ed.);D.R. Ulrich(ed.)
  16. J. Am. Ceram. Soc. v.48 no.11 Infrared Absorption Spectrum of Silicon Dioxide R. Hanna
  17. J. Non-Cryst. Solids v.145 Structural Investigation of the Silica-Titania Gel/Glass Transition M. Beghi;P. Chiurlo;L. Costa;M. Palladino;M.F. Pirini
  18. Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing C.J. Brinker;G.W. Scherer
  19. Better Ceramics Through Chemistry Ⅱ. Thermal, Acoustical and Structural Properties of Silica Aerogels J. Fricke;G. Reichenauer;C.J. Brinker(ed.);D.E. Clark(ed.);D.R. Ulrich(ed.)
  20. Powder Surface Area and Porosity(2nd Ed.) S. Lowell;J. E. Shields
  21. J. Am. Chem. Soc. v.62 On a Theory of Van der Waals Adsorption of Gases S. Brunauer;L.S. Deming;W.S. Deming;E. Teller
  22. Aerogels;Springer Proc. Phys. v.6 Microstructural Properties of Transparent Silica Aerogels P.H. Tewari;A.J. Hunt;J.G. Lieber;K. Lofftus;J. Fricke(ed.)
  23. Ultrastructure Processing of Advanced Ceramics Chemistry of Multicomponent Alkoxide Precursors to Ultrastructure Processes J.D. Basil;Chia-Cheng Lin;J.D. Mackenzie(ed.);D.R. Ulrich(ed.)