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Browsing by Author "Yalisi, B"

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Antiferromagnetic–paramagnetic state transition of NiO synthesized by pulsed laser deposition

Author: Nkosi, SS ; Yalisi, B ; Motaung, DE ; Keartland, J ; Sideras-Haddad, E ; Forbes, A ; Mwakikunga, Bonex W Date: Jan 2013 Thin films of nickel oxide (NiO) were deposited on Al substrates at different substrate temperatures using pulsed laser deposition (PLD). Microwave power absorption measurements at 9.4 GHz (X-band) were carried out on these PLD grown films. ... Read more
Carbon nanotube/nickel oxide nanocomposite thin films for selective solar absorber

Author: Roro, Kittessa T ; Mwakikunga, Bonex W ; Forbes, A ; Tile, N ; Yalisi, B Date: Sep 2010 Multi-walled carbon nanotube (MWCNT)/Nickel oxide nanocomposites were prepared on aluminum substrates for selective solar absorber applications. MWCNTs are functionalized in order to disperse in water and ethanol. Results from the characterization ... Read more
Effect of accelerated thermal ageing on the selective solar thermal harvesting properties of multiwall carbon nanotube/nickel oxide nanocomposite coatings

Author: Roro, Kittessa T ; Mwakikunga, Bonex W ; Tile, N ; Yalisi, B ; Forbes, A Date: May 2012 Varying amounts of dispersed multiwalled carbon nanotubes in NiO have been used to develop composites that absorb the solar energy very well but lose very little through emission. Determination of absorptance, asol, and emissivity, ether, ... Read more
Effect of heating temperature on the optical properties of sol-gel synthesized C/NiO nanocomposite thin films

Author: Roro, Kittessa T ; Tile, N ; Yalisi, B ; Forbes, A Date: May 2011 For efficient photo-thermal conversion of solar energy a spectrally selective solar absorber surfaces are widely used. An ideal selective surface should have a high absorptance (low reflectance) in the solar wavelength range (0.3 to 2.5 µm) ... 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
Properties of pulsed laser deposited NiO/MWCNT thin films

Author: Yalisi, B ; Roro, Kittessa T ; Forbes, A Date: May 2011 Pulsed laser deposition (PLD) is a thin-film deposition technique, which uses short and intensive laser pulses to evaporate target material. The technique has been used in this work to produce selective solar absorber (SSA) thin film composites ... Read more
Pulsed laser deposition of multiwall carbon nanotube/NiO nanocomposite thin films

Author: Yalisi, B ; Roro, Kittessa T ; Tile, N ; Forbes, A Date: Jul 2011 Due to their excellent properties CNTs is believed to be the best candidate to be an absorbing elements in the composite. “Stoichiometric transfer” makes PLD a suitable candidate for the composite growth. PLD experimental setup is discussed. ... Read more
Selective solar absorber coating research at the CSIR (South Africa)

Author: Roro, Kittessa T ; Tile, N ; Yalisi, B ; De Gama, M ; Wittes, T ; Roberts, T ; Forbes, A Date: May 2011 A sol-gel technique has been established at a laboratory scale for low cost production of high efficient selective solar absorbers comprising a composite material of nano-structured carbon in a nickel oxide matrix. In order for these materials ... Read more
Solar absorption and thermal emission properties of multiwall carbon nanotube/nickel oxide nanocomposite thin films synthesized by sol-gel process

Author: Roro, Kittessa T ; Tile, N ; Mwakikunga, Bonex W ; Yalisi, B ; Forbes, A Date: May 2012 Multiwall carbon nanotubes (MWCNTs)/nickel oxide (NiO) nanocomposites were successfully prepared by a sol–gel process and coated on an aluminium substrate. The MWCNTs were chemically functionalized and then added into NiO alcogels, and magnetic ... Read more

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Browsing by Author "Yalisi, B"

Browsing by Author "Yalisi, B"

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