Light scattering materials for energy-related applications: Determination of absorption and scattering coefficients

Junxin Wang, Annica M. Nilsson, David Barrios, William E. Vargas, Ewa Wäckelgård, Gunnar A. Niklasson

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

To facilitate optical design of energy-efficient materials and devices, a detailed knowledge of their basic optical parameters is necessary. 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. 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) solar reflecting TiO2-pigmented paints and (d) selective solar absorbing paints for solar collectors.

Original languageEnglish
Pages (from-to)2474-2480
Number of pages7
JournalMaterials Today: Proceedings
Volume33
DOIs
StatePublished - 2019
Event2019 Fall Meeting Metal Oxide- and Oxyhydride-based Nanomaterials for Energy and Environment-related Applications, EMRS 2019 - Warsaw, Poland
Duration: 16 Sep 201919 Sep 2019

Bibliographical note

Funding Information:
This work was supported by the Swedish Research Council grant 2016-03713 . We thank Cricursa S. A. for supplying SPD devices and Peter Greenwood for supplying the TiO 2 paints. We also acknowledge Tuquabo Tesfamichael and Torbjörn Nilsson for part of the reanalyzed experimental data.

Publisher Copyright:
© 2019 Elsevier Ltd. All rights reserved.

Keywords

  • Absorption coefficient
  • Kubelka-Munk theory
  • Light scattering
  • Paint
  • Pigmented polymer
  • Scattering coefficient
  • Suspended particle device

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