Katumba, GMakiwa, GOlumekor, LForbes, A2008-01-312008-01-312008-01Katumba, 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 549-5511610-1634http://hdl.handle.net/10204/1997Copyright: 2008 John Wiley & Sons LtdIt 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.enCarbon nanoparticlesSolarMatricesUniversity of ZimbabweCSIRSolar absorbersSol-gel techniquesSilica matrixCoatingsArticleKatumba, G., Makiwa, G., Olumekor, L., & Forbes, A. (2008). Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices. http://hdl.handle.net/10204/1997Katumba, G, G Makiwa, L Olumekor, and A Forbes "Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices." (2008) http://hdl.handle.net/10204/1997Katumba G, Makiwa G, Olumekor L, Forbes A. Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices. 2008; http://hdl.handle.net/10204/1997.TY - Article AU - Katumba, G AU - Makiwa, G AU - Olumekor, L AU - Forbes, A AB - 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. DA - 2008-01 DB - ResearchSpace DP - CSIR KW - Carbon nanoparticles KW - Solar KW - Matrices KW - University of Zimbabwe KW - CSIR KW - Solar absorbers KW - Sol-gel techniques KW - Silica matrix KW - Coatings LK - https://researchspace.csir.co.za PY - 2008 SM - 1610-1634 T1 - Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices TI - Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices UR - http://hdl.handle.net/10204/1997 ER -