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Synthesis of window glazing coated with silica aerogel films via ambient drying
Authors:Gun-Soo Kim  Sang-Hoon Hyun  
Affiliation:

School of Materials Science and Engineering, Yonsei University, 134, Schinchon-dong, Sudaemoon-ku, Seoul 120-749, South Korea

Abstract:An ambient drying process (1 atm, 270 °C) has been developed in order to synthesize window glazing coated with silica aerogel films. The aerogel film could be manufactured by this process of wet gel films obtained via a dip-/spin-coating of the silica sol on a glass slide. Before drying, the isoproponol solvent in wet gels was exchanged with n-heptane to minimize the drying shrinkage. The thickness, refractive index, and porosity of silica films were 0.16–10 μm, 1.08–1.09, and 80–84%, respectively. The transmittance of window glazing was over 90% and we could predict that the optimal thermal conductivity (0.2 W/(m K)) of the window glazing would be obtained at the aerogel thickness of 100 μm (0.016 W/(m K)).
Keywords:
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