Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication and Network Strengthening of Monolithic Silica Aerogels Using Water Glass

물유리를 이용한 모노리스 실리카 에어로젤의 제조 및 구조강화

  • Han, In-Sub (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Park, Jong-Chul (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Kim, Se-Young (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Hong, Ki-Seog (Energy Materials Research Center, Korea Institute of Energy Research) ;
  • Hwang, Hae-Jin (Department of Materials Science and Engineering, Inha University)
  • 한인섭 (에너지재료연구센터 한국에너지기술연구원) ;
  • 박종철 (에너지재료연구센터 한국에너지기술연구원) ;
  • 김세영 (에너지재료연구센터 한국에너지기술연구원) ;
  • 홍기석 (에너지재료연구센터 한국에너지기술연구원) ;
  • 황해진 (인하대학교 재료공학과)
  • Published : 2007.03.31
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Abstract

Silica wet gels were prepared ken water glass ($29\;wt%\;SiO_{2}$) by using Amberlite as a ion exchange resin. After washing in distilled water, the wet gels were further aged in a solution of TEOS/EtOH to strengthen of 3-dimensional network structure. As increase TEOS content in aging solution, BET surface area and porosity of the ambient dried silica aerogels were significantly decreased, and average pore diameter was also decreased 30 nm to -10 nm. Also, higher density and compressive strength were obtained in case of higher TEOS content. This is due to precipitation of $SiO_{2}$ nano particles by TEOS. Hence, TEOS addition plays an important role of both strengthening and stiffness of silica wet gel network. By adding over 30 vol% TEOS, a crack-free monolithic silica aerogel tiles were obtained and its density, compressive strength, and thermal conductivity were shown $0.232g/cm^{3}$, 7.3 MPa, and 0.029 W/mk, respectivly.

Keywords

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