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Browsing by Subject "Solar absorbers"

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Annealing effect on the structural and optical properties of Cr/ -Cr2O3 monodispersed particles based solar absorbers

Author: Khamlich, S ; McCrindle, R ; Nuru, ZY ; Cingo, N ; Maaza, M Date: Jan 2013 A cost-effective and environmentally friendly green chemical method, the so-called aqueous chemical growth (ACG) method, was used to deposit chromium/alpha-chromium(III) oxide, Cr/a-Cr2O3, monodispersed particles, for solar absorbers applications. ... Read more
Annealing effect on the structural and optical properties of Cr/a-Cr2O3 monodispersed particles based solar absorbers

Author: Khamlich, S ; McCrindle, R ; Nuru, ZY ; Cingo, N ; Maaza, M Date: Jan 2013 A cost-effective and environmentally friendly green chemical method, the so-called aqueous chemical growth (ACG) method, was used to deposit chromium/alpha-chromium(III) oxide, Cr/a-Cr2O3, monodispersed particles, for solar absorbers applications. ... Read more
Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectic properties - SAIP Poster

Author: Katumba, G ; Baisitse, T ; Forbes, A ; Olumekor, L ; Wackelgard, E Date: Jul 2006 The Bruggeman and Maxwell-Garnett effective medium approximations (EMAs) have been used to investigate optical properties of composite materials. The EMA assumptions are based on random unit cell models in which metal particles are embedded ... Read more
Carbon-in-silica composite selective solar absorbers: a determination of composition and dielectric properties

Author: Katumba, G ; Forbes, A Date: Aug 2009 The Bruggeman and Maxwell-Garnett effective medium approximations have been used widely to investigate optical properties of many different composite materials. In most cases, the effective medium approximation assumptions are based on random ... Read more
Cr/alpha-Cr2O3 monodispersed spherical core-shell particles based solar absorbers

Author: Khamlich, S ; Nuru, ZY ; Nemutudi, R ; Nemraoui, O ; Roro, Kittessa T ; Mongwaketsi, N ; McCrindle, R ; Cingo, N ; Maaza, M Date: Jul 2011 Monodispersed spherical core-shell particles of Cr/alpha-Cr2O3 cermet ACG coatings investigated within this contribution could be successfully employed in thermal converters. Their selectivity depends on their chemical, physical and structural ... Read more
Fabrication and characterisation of selective solar absorber surfaces prepared by sol-gel technique

Author: Katumba, G ; Olumekor, L ; Forbes, A ; Wackelgard, E Date: Jul 2006 The investigation and development of carbon-silica composites has been going on for some time. Different applications such as adsorbents, biosensors, templates and solar absorbers have emanated from these studies. The concept of using solar ... Read more
Fabrication of MWCNT/NiO nanocomposite thin films for optically selective solar absorbers

Author: Roro, Kittessa T Date: Jul 2011 This presentation explores solar thermal energy for harnessing solar energy for thermal energy (heat). Solar thermal collectors for water heating use a spectrally selective surface that absorb sunlight and convert it to heat. The presentation ... Read more
Fabrication of selective solar absorbers using pulsed laser deposition

Author: Yalisi, B ; Katumba, G ; Forbes, A ; Pillay, SR Date: Jun 2009 Selective solar absorbers are devices that have been designed to absorb as much as possible of the solar radiation which is in the wavelength range of 0.3 to 2.5 µm and to minimise thermal emittance in the wavelength range from 2.5µm to the ... Read more
Femtosecond laser surface structuring and oxidation of chromium thin coatings: black chromium.

Author: Kotsedi, L ; Nuru, ZY ; Mthunzi-Kufa, Patience ; Muller, TFG ; Eaton, SM ; Julies, B ; Manikandan, E ; Ramponi, R ; Maaza, M Date: Dec 2014 In view of their potential applications as selective solar absorbers, chromium coatings on float glass substrates were nano/micro structured by femtosecond laser in air. Raman and X-rays diffraction investigations confirmed the formation of ... Read more
Scanning and transmission electron microscopy investigation of multiwall carbon nanotube/nickel oxide nanocomposite thin films

Author: Roro, Kittessa T ; Mwakikunga, Bonex W ; Tile, N ; Forbes, A Date: Dec 2011 Owing to their unique electronic and optical properties, nanocomposite thin films are widely used for converting solar radiation therapy into other conventional energy forms, such as heat and electricity. Carbon nanotube-based composites which ... Read more
Solar selective absorber functionality of carbon nanoparticles embedded in SiO2, NiO and ZnO matrices

Author: Katumba, G ; Makiwa, G ; Olumekor, L ; Forbes, A Date: Jan 2008 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 ... Read more
Synthesis and optical characterization of C-SiO2 and C-NiO sol-gel composite films for use as selective solar absorbers

Author: Makiwa, G ; Katumba, G ; Olumekor, L Date: Aug 2008 The authors present a cheaper and environmentally friendly method to fabricate efficient spectrally selective solar absorber materials. The sol-gel technique was used to fabricate carbon-silica (C-SiO2) and carbon-nickel oxide (C-NiO) composite ... Read more

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Browsing by Subject "Solar absorbers"

Browsing by Subject "Solar absorbers"

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