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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1997

Title: Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices
Authors: Katumba, G
Makiwa, G
Olumekor, L
Forbes, A
Keywords: Carbon nanoparticles
Solar
Matrices
University of Zimbabwe
CSIR
Solar absorbers
Sol-gel techniques
Silica matrix
Coatings
Issue Date: Jan-2008
Publisher: John Wiley & Sons Ltd
Citation: Katumba, G et al. 2008. Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices. Physica Status Solidi C Conferences, Vol. 5(2), pp 549-551
Abstract: It is possible to design an optical material, through control of the substrate and coatings, to absorb a large fraction of the solar spectrum and to emit very little radiation energy in the near and far infra-red wavelength range. This requires a coating structure that transmits in the ultraviolet and visible, but reflects in the near and far infrared, with a sharp drop in transmission near 2 μm. In this paper, the authors report on selective solar absorber coatings of carbon nano-particles embedded in SiO2, ZnO and NiO matrices, fabricated by a sol-gel technique. The coatings were tested on aluminium substrates. UV-VIS and FTIR spectroscopies were used to determine the spectral response of the composite coatings, from which the solar absorptance and thermal emittance were determined. It is shown that the NiO matrix samples have the best solar selective behaviour, and suggest a theoretical evaluation framework for future comparison of such materials.
Description: Copyright: 2008 John Wiley & Sons Ltd
URI: http://hdl.handle.net/10204/1997
ISSN: 1610-1634
Appears in Collections:Laser physics and technology
General science, engineering & technology

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