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Effect of accelerated thermal ageing on the selective solar thermal harvesting properties of multiwall carbon nanotube/nickel oxide nanocomposite coatings

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dc.contributor.author Roro, Kittessa T
dc.contributor.author Mwakikunga, Bonex W
dc.contributor.author Tile, N
dc.contributor.author Yalisi, B
dc.contributor.author Forbes, A
dc.date.accessioned 2012-07-02T09:15:57Z
dc.date.available 2012-07-02T09:15:57Z
dc.date.issued 2012-05
dc.identifier.citation Roro, KT, Mwakikunga, B, Tile, N, Yalisi, B and Forbes, A. 2012. Effect of accelerated thermal ageing on the selective solar thermal harvesting properties of multiwall carbon nanotube/nickel oxide nanocomposite coatings. International Journal of Photoenergy, doi:10.1155/2012/678394 en_US
dc.identifier.issn 1110-662X
dc.identifier.uri http://www.hindawi.com/journals/ijp/2012/678394/
dc.identifier.uri http://hdl.handle.net/10204/5963
dc.description Copyright © 2012 Kittessa T. Roro et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. en_US
dc.description.abstract 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, from such selective solar absorbers shows that the optimum efficiency of 71% can be attained when about 10 mg of MWCNTs are composited with NiO. One such absorber was subjected to thermal ageing tests. The performance criterion (PC) limit for passing the test when simulated for 25 years is (- a+0.25 e)=0.05. It was found that the typical absorber had a PC value of -0.01. This value is much better than the passing limit. Raman spectra of the typical absorber before and after the thermal ageing test showed a reduced intensity in the D and G bands of disordered and graphitic carbon, respectively but an enhancement of the NiO bands indicating loss of carbon atoms due to thermal ageing tests. Simple equations are derived determining the proportion of carbon atoms that are lost and the proportion of carbon atoms that remains in the absorber; both of these are in agreement with the original carbon composition before the thermal ageing test. It is reported that the typical absorber will retain 63% of the carbon after 25 years. en_US
dc.language.iso en en_US
dc.publisher Hindawi Publishing Corporation en_US
dc.relation.ispartofseries Workflow;9190
dc.subject Multiwalled carbon nanotubes en_US
dc.subject Solar thermal harvesting en_US
dc.subject Composite materials en_US
dc.subject Nanostructured composite films en_US
dc.title Effect of accelerated thermal ageing on the selective solar thermal harvesting properties of multiwall carbon nanotube/nickel oxide nanocomposite coatings en_US
dc.type Article en_US


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