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Thursday, 26 November 2020
Raw materials & technologies, Technologies, Nanotechnology

Solar spectral performance of nanopigments

Wednesday, 4 January 2017

Solar spectral behaviour of nanopigments has been an important issue in many practical relevance due to their tunable properties.

Solar spectral performance of nanopigments. Source: moorhenne/

Solar spectral performance of nanopigments. Source: moorhenne/

There are extensive literatures on radiative transfer through pigmented coating but they are generally restricted to a small range of materials with specific properties and particular applications.

Fundamental characteristics of nanopigments

Current study, on the other hand, concerns with a comprehensive look at contribution of fundamental characteristics of nanopigments on spectral behaviour of the pigmented coatings. In order to accomplish this goal, a Discrete Ordinate Method (DOM), known as Multi Flux (MF) model in colour science, has been applied on spherical particles embedded in nonabsorbing medium, and their optical responses including reflectance, transmittance and absorption has been studied over solar spectrum, with special emphasis on VIS region.

Promising for spectrally selective pigmented coatings

The effect of various indices of refraction, particle sizes and volume fractions has been further investigated. Obtained results reveal that, pigments with different fundamental and morphological structures represent interesting optical behaviour which is very promising in optimisation of spectrally selective pigmented coatings. The results from MF model were subsequently validated using spectrophotometric measurements on titanium dioxide nanopigments coated on white polyester substrate, which represented a good agreement with collected data from MF model.

The study is published in: Solar Energy Materials and Solar Cells, Volume 162, April 2017, Pages 72–82

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