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Lightweight and Thermally Insulating Aerogel Glass Materials

Gao, Tao; Jelle, Bjørn Petter; Gustavsen, Arild; He, Jianying
Journal article, Peer reviewed
Published version
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Lightweight+and+Thermally+Insulating+Aerogel+Glass+Materials.pdf (Locked)
URI
http://hdl.handle.net/11250/2468001
Date
2014
Metadata
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  • Institutt for arkitektur og teknologi [607]
  • Institutt for bygg- og miljøteknikk [5147]
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  • Publikasjoner fra CRIStin - NTNU [41946]
Original version
Applied Physics A: Materials Science & Processing. 2014, 117 (2), 799-808.   10.1007/s00339-014-8609-7
Abstract
Glass represents an important and widely used building material, and crucial aspects to be addressed include thermal conductivity, visible light transmittance, and weight for windows with improved energy efficiency. In this work, by sintering monolithic silica aerogel precursors at elevated temperatures, aerogel glass materials were successfully prepared, which were characterized by low thermal conductivity [k ≈ 0.17–0.18 W/(mK)], high visible transparency (Tvis ≈ 91–96 % at 500 nm), low density (ρ ≈ 1.60–1.79 g/cm3), and enhanced mechanical strength (typical elastic modulus Er ≈ 2.0–6.4 GPa). These improved properties were derived from a series of successive gelation and aging steps during the desiccation of silica aerogels. The involved sol → gel → glass transformation was investigated by means of thermo-gravimetric analysis, scanning electron microscopy, nanoindentation, and Fourier transform infrared spectroscopy. Strategies of improving further the mechanical strength of the obtained aerogel glass materials are also discussed.
Publisher
Springer Verlag
Journal
Applied Physics A: Materials Science & Processing

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