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Light scattering materials for energy-related application: Determination of absorption and scattering coefficients.
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.
Universidad Polytechnica Salesiana, Guayaquil, Ecuador..
Universidad de Costa Rica.
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Many smart materials with applications in the fields of solar energy and energy-efficient buildings are structured and exhibit significant light scattering. To facilitate optical design of materials and devices for these applications, knowledge of their basic optical parameters, describing light scattering and absorption is necessary. Previous methods to extract these coefficients from experimental data either relied on unverified approximations or required extensive computational effort. In certain cases the obtained scattering and absorption coefficients could even not accurately reproduce the experimental spectra.

In this paper we present a novel method for determining scattering (S) and absorption (K) coefficients from total transmittance and reflectance measurements by inversion of the Kubelka-Munk theory. The reflectance parameters appearing in this theory depend on the angular distribution of scattered light inside the material. We present an approximation for this distribution that was verified by comparison with angle resolved scattering measurements. The versatility of our method is demonstrated by a reanalysis of experimental data for several materials of interest in energy-related applications. Specifically we report spectra of S and K for: (a) pigmented polymer foils for radiative cooling applications; (b) suspended particle devices for smart windows; (c) selective solar absorbing paints for solar collectors and (d) solar reflecting TiO2-pigmented paints.

Place, publisher, year, edition, pages
2019. article id R 7.2
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-395213OAI: oai:DiVA.org:uu-395213DiVA, id: diva2:1361184
Conference
E-MRS Spring Meeting 2019. IUMRS-ICAM International Conference on Advanced Materials, Nice, France, May 27-31, 2019.
Available from: 2019-10-15 Created: 2019-10-15 Last updated: 2019-10-15

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