화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.27, No.4, 1301-1309, July, 2010
DOI10.1007/s11814-010-0173-z  Export Citation
Influence of aging conditions on textural properties of water-glass-based silica aerogels prepared at ambient pressure
Pradip Bhikaji Sarawade, Jong-Kil Kim, Askwar Hilonga, and Hee Taik Kim†
  • Department of Chemical Engineering, Hanyang University, 2-260, Ansan, Gyeonggi-do 426-791, Korea
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The experimental results of aging time and temperature on the textural properties of water-glass (sodium silicate)-based silica aerogels are reported and discussed. Aging of the hydrogel for different times and temperatures led to an ability to increase the stiffness and strength of the networks. These improvements enabled the gel to withstand ambient pressure drying (APD) and, consequently, preserve the highly porous silica network without collapse. The pore size and volume increased with increasing aging temperature and time, while the specific surface area decreased. Monolithic aerogels with extremely low bulk density (~0.069 g/cm3), high specific surface area (820 m2g-1), large cumulative pore volume (3.8 cm3g-1), and high porosity (~96%) were obtained by aging at 60 ℃ for 18 hours. Therefore, easy synthesis of monolithic silica aerogels at ambient pressure is achievable using a relatively inexpensive silica precursor (sodium silicate).
Keywords:Silica Aerogels;Sodium Silicate;Ambient Pressure;Monolithic
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