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Spectrally selective and adaptive surfaces for protection against radiative heating: ITO and VO2
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2014 (English)In: Fire and Materials, ISSN 0308-0501, E-ISSN 1099-1018, Vol. 38, no 1, 111-124 p.Article in journal (Refereed) Published
Abstract [en]

Two surface materials for reducing absorptivity of heat radiation from fires have been investigated. The first is VO2, which is a thermochromic material. When the temperature of a VO2 surface increases over a certain temperature, it switches, ideally, from infrared (IR)-absorbing to IR-reflecting. VO2 window coatings are still on a research level, yet to be commercialized. In this study, VO2 powder available on the market was investigated. The thermochromic effect could be identified but was not large enough to significantly improve the fire properties of treated surfaces. Some thoughts concerning how to improve the performance of VO2 are discussed. The second investigated material is indium tin oxide (ITO), which is a so called low-e coating, which means that it has low emissivity and absorptivity in the IR part of the spectrum. ITO is spectrally selective in the sense that it transmits visible light while reflecting a large fraction of the IR radiation, which is a rare property for surfaces in general but a typical property of thin electrically conducting non-metallic films. It is shown that the application of ITO to poly(methyl methacrylate) (PMMA) significantly improves its fire properties. ITO coating is a mature technology already in widespread use today in the electronics industry.

Place, publisher, year, edition, pages
2014. Vol. 38, no 1, 111-124 p.
Keyword [en]
spectral absorptivity, radiative heat transfer, low-e coating, indium tin oxide, thermochromicity, VO2
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-218960DOI: 10.1002/fam.2167ISI: 000329855700009OAI: oai:DiVA.org:uu-218960DiVA: diva2:698178
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2017-12-06Bibliographically approved

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Zhao, ShuxiRoos, Arne

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