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http://dx.doi.org/10.6117/kmeps.2018.25.4.143

The Effect of Acetonitrile on the Texture Properties of Sodium Silicate Based Silica Aerogels  

Kim, Younghun (Department of Materials Science and Engineering, Yonsei University)
Kim, Taehee (Department of Materials Science and Engineering, Yonsei University)
Shim, Jong Gil (GLChem Co., ltd.)
Park, Hyung-Ho (Department of Materials Science and Engineering, Yonsei University)
Publication Information
Journal of the Microelectronics and Packaging Society / v.25, no.4, 2018 , pp. 143-148 More about this Journal
Abstract
Sodium silicate based silica aerogels are lower in cost than silica alkoxide based silica aerogels, but the demand is decreasing as their physical properties are lowered. In this research, acetonitrile as a drying control chemical additive (DCCA) is added in the sol state to improve the pore-structural properties of sodium silicate based silica aerogel by preventing the agglomeration of particles and cross-linked bond. The sodium silicate based silica aerogel by ambient pressure drying were prepared by sol-gel process. Acetonitrile/$Na_2SiO_3$ molar ratio of 0, 0.05, 0.1, 0.15, and 0.2 was added to the sol state. The physical properties of the final product were analyzed using Fourier transform infrared, contact angle measurement, Brunauer-Emmett-Teller and Barrett-Joyner-Halenda measurements and field emission scanning electron microscopy. It was confirmed that the sample with adding 0.15 molar ratio of acetonitrile and sodium silicate showed a high specific surface area ($577m^2/g$), a high pore volume (3.29 cc/g), and a high porosity (93%) comparable to the pore-structural properties of silica alkoxide based silica aerogels.
Keywords
acetonitrile; drying control chemical additive; sodium silicate; silica aerogel; ambient pressure drying;
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