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http://dx.doi.org/10.12925/jkocs.2014.31.1.83

Preparation and characterization of nanoporous monolith with high thermal insulation performance  

Choi, Hyun-Muk (Department of Chemical Engineering, Kyonggi University)
Kim, Seong-Woo (Department of Chemical Engineering, Kyonggi University)
Publication Information
Journal of the Korean Applied Science and Technology / v.31, no.1, 2014 , pp. 83-91 More about this Journal
Abstract
In this study, we synthesized two different silica monoliths by using sol-gel, solvent exchange, surface modification, ambient pressure drying processes, and surfactant-based templating technique followed by calcination process. All of the prepared two silica monoliths showed crack-free appearance with fairly good transparency, and furthermore were confirmed to have extremely high porosity, specific surface area, and mean pore size below 30 nm. The silica aerogel sample exhibited finer and more homogeneous nano-sized pore structure due to spring back effect caused by surface modification, which resulted in better thermal insulation performance. Based on measured thermal conductivities and theoretical relationship, multi-layered glass window system in which silica monolith prepared in this study was inserted as a middle layer was revealed to have superior thermal insulation performance compared to conventional air-inserted glass window system.
Keywords
silica monolith; nano-sized pore; thermal insulation performance; glass window;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 K. I. Jensen, J. M. Schultz, and F. H. Kristiansen, Development of windows based on highly insulating aerogel glazings, J. Non-Cryst. Solids, 350, 351 (2004).   DOI   ScienceOn
2 S. D. Bhagat, C. S. Oh, Y. H. Kim, Y. S. Ahn, and H. G. Yeo, Methyltrimethoxysilane based monolithic silica aerogel via ambient pressure drying, Microporous and Mesoporous Meterials, 100, 350 (2007).   DOI   ScienceOn
3 T. Y. Wei, T. F. Chang, and S. Y. Lu, Preparation of Monolithic Silica Aerogel of Low Thermal Conductivity by Ambient Pressure Drying, J. Am. Ceram. Soc., 90, 2003 (2007).   DOI   ScienceOn
4 J. L. Gurav, D. Y. Nadargi, A. V. Rao, Effect of mixed Catalysts system on TEOS-based silica aerogels dried at ambient pressure, Appl. Surf. Sci, 255, 3019, (2008)   DOI   ScienceOn
5 S. W. Ryu, S. S. Kim, and Y. J. Oh, Influence of solvent on the nano porous silica aerogels prepared by ambient drying process, J. Korean Sensors Society, 15, 371 (2006).
6 H. S. Kim, S. K. Jeong, and S. H. Jeong, Experimental Research about Thermal insulation Performance of Various Powder Insulation Methods, J. Kor. Inst. Appl. Supercond. Cryog., 12, 49 (2010).
7 J. E. Fesmire and S. D. Augustynowicz, Thermal Performance Testing of Glass Microspheres under Cryogenic Vacuum Conditions, Transactions of the Crygenic Engineering Conference, 49, 612 (2004).
8 R. G. Baumgartner, E. A. Myers, J. E. Fesmire, D. L. Morries, and E. R. Sokalski, Demonstration of Microsphere Insulation in Cryogenic Vessels, Transactions of the Crygenic Engineering Conference, 51, 1351 (2006).
9 N. Y. Kim, Y. W. Chang and S. W. Kim, Thermal Insulation Property of UV Cure Coatings Using Hollow Micro-Spheres, Korean Chem. Eng. Res., 50, 621 (2012).   DOI   ScienceOn
10 Y. W. Chang and S. W. Kim, UV curable transparent urethane-acrylate/clay nanocomposite coating materials with thermal barrier property, Surf. & Coat Technol. 232, 294 (2013).
11 S. S. Kistler, Coherent Expanded Aerogels and Jellies, Nature, 127, 741 (1931).
12 M. Schmidt and F. Schwertfeger, Application for silica aerogel products, J. Non-Cryst. Solids, 225, 364 (1998).   DOI   ScienceOn
13 I. S. Han, J. C. Park, S. Y. Kim, K. S. Hong, and H. J. Hwang, Fabrication and Network Strengthening of Monolithic Silica Aerogels Using Water Glass, J. Kor. Ceram. Soc., 44, 162 (2007).   DOI
14 P. H. Tewart, A. J. Hunt, and K. D. Loffus, Mater. Lett., 3, 363 (1985).   DOI   ScienceOn