Ambient-pressure Drying Synthesis of High-performance Silica Aerogel Powders by Controlling Hydrolysis Reaction of Water Glass

Sang-Eun Lee; Young-Soo Ahn; Jin-Suk Lee; Churl-Hee Cho; Chang Kook Hong; Oh-Hoon Kwon

doi:http://dx.doi.org/

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자료유형: 학술저널

저자정보: Sang-Eun Lee (Advanced Materials and Devices Laboratory Korea Institute of Energy Research Daejeon 305-343 Korea) Young-Soo Ahn (Advanced Materials and Devices Laboratory Korea Institute of Energy Research Daejeon 305-343 Korea) Jin-Suk Lee (Advanced Materials and Devices Laboratory Korea Institute of Energy Research Daejeon 305-343 Korea) Churl-Hee Cho (Graduate School of Energy Science and Technology Chungnam National University Daejeon 305-764 Korea) Chang Kook Hong (School of Chemical Engineering Chonnam National University Gwangju 500-757 Korea) Oh-Hoon Kwon (Department of Chemistry School of Natural Science Ulsan National Institute of Science and Technolog)

저널정보: 한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제18권 제11호

발행연도: 2017.11

수록면: 777 - 782 (6page)

DOI: http://dx.doi.org/

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Silica aerogel powders were synthesized from inexpensive water glass under ambient-pressure drying (APD). Silica sol was synthesized by using adding hydrochloric acid (HCl) to diluted water glass, the silica sol was rapidly formed hydrogel by the addition of isopropyl alcohol (IPA), a new gelation agent. After solvent exchange and surface modification, silica aerogel powders were obtained by ambient-pressure drying the chemically treated hydrogel. This study especially investigates how the amount of added HCl affects properties of the silica aerogel powders, namely the tap density, specific surface area, pore size and volume, microstructure, and hydrophobicity. The aerogel powders size and density were found to decrease and the specific surface area, pore size and pore volume increase with increasing amounts of added HCl. The aerogel powders synthesized with the largest amount of HCl (volume ratio of HCl to water glass: 0.53) showed the tap density, specific surface area, pore size, pore volume, and thermal conductivity of 0.10 g/cm3, 819 m2/g, 12.00 nm, 3.14 cm3/g, and 0.023 W/mK, respectively. Also, it showed good hydrophobicity and thermal stability. It was evident that HCl addition amount can be one of key parameters to control the physical and thermal properties of silica aerogel.

#Aerogel #Inorganic acid #Alcohol #Water glass #Ambient-pressure drying.

참고문헌 (30)

참고문헌 신청

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L.W. Hrubesh / 1998 / J. Non-Cryst. Solids 225:335~342

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Sang-Eun Lee

소속기관 Advanced Materials and Devices Laboratory Korea Institute of Energy Research Daejeon 305-343 Korea