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.
|Number of pages||7|
|Journal||Materials Today: Proceedings|
|State||Published - 2019|
|Event||2019 Fall Meeting Metal Oxide- and Oxyhydride-based Nanomaterials for Energy and Environment-related Applications, EMRS 2019 - Warsaw, Poland|
Duration: 16 Sep 2019 → 19 Sep 2019
Bibliographical noteFunding 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.
© 2019 Elsevier Ltd. All rights reserved.
- Absorption coefficient
- Kubelka-Munk theory
- Light scattering
- Pigmented polymer
- Scattering coefficient
- Suspended particle device