Synthesis of silica glass using solventless sol-gel process - Code: HP10

Kun Hong Lee, Yung Pyo Koh, Jae Gon Lim

Research output: Contribution to journalArticlepeer-review

Abstract

Silica glass was synthesized form TEOS and deionized water using sol-gel process. To introduce the physicochemical effects of ultrasonic waves, an ultrasonic homogenizer was used to mix reactants instead of adding cosolvents. 2-step method was chosen to separate hydrolysis reaction and condensation reaction, and thus to control the microstructure of wet gels. Wet gels were dried in 5-8 hours without cracks using supercritical drying with ethanol at 300°C and 10.34 MPa. Aerogels thus obtained have hydrophobic surfaces due to the reesterification reactions during supercritical drying. Aerogels were sintered in a tube furnace in the changing atmosphere from N2 through O2 to He. Sudden volume change was started at 1050°C and sintering was completed at 1100°C as expected. Large pores of aerogels allowed fast sintering in 16 and a half hours. Incomplete extraction in supercritical drying step produced crystals during sintering.

Original languageEnglish
Pages (from-to)907-912
Number of pages6
JournalJournal of Sol-Gel Science and Technology
Volume2
Issue number1-3
DOIs
StatePublished - Jan 1994

Keywords

  • aerogel
  • silica glass
  • sonogel
  • synthesis

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