Stearyl alcohol/palm triple pressed acid-graphite nanocomposites as phase change materials

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dc.contributor.author Mhike, Washington
dc.contributor.author Focke, Walter Wilhelm
dc.contributor.author Mackenzie, Jodi
dc.contributor.author Mills, Edward J.
dc.contributor.author Badenhorst, Heinrich
dc.date.accessioned 2018-07-18T06:05:50Z
dc.date.issued 2018-05
dc.description.abstract Mixtures of stearyl alcohol with palm triple pressed acid (essentially a mixture of palmitic and stearic acid derived from palm oil) were prepared and characterized to assess their phase change thermal energy storage utility. Unlike the other mixtures, the 35 mol% stearyl alcohol mixture showed a single crystallization exotherm peak, albeit with a small shoulder, in differential scanning calorimetry. The enthalpy associated with this phase change was 158 ± 5 kJ kg−1 and the crystallization peak temperature was 46 °C. Inclusion of 10 wt.% graphite nanoplatelets increased the solid state and melt state thermal conductivities by factors of approximately six and twelve respectively. This nanocomposite showed no deterioration in thermal properties after hundred heating and cooling cycles between the end-temperatures of 30 °C and 60 °C when scanned at a rate of 10 °C min−1. There was also no evidence of graphite platelet sedimentation in the molten liquid after two months at 80 °C. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.embargo 2019-05-10
dc.description.librarian hj2018 en_ZA
dc.description.sponsorship The South African Research Chairs Initiative of the Department of Science and Technology and the National Research Foundation (NRF) of South Africa (Grant No. 97994 ), the African Laser Centre (ALC) and the Energy Institutional Research Theme of the University of Pretoria . en_ZA
dc.description.uri http://www.elsevier.com/locate/tca en_ZA
dc.identifier.citation Mhike, W., Focke, W.W., Mackenzie, J. et al. 2018, 'Stearyl alcohol/palm triple pressed acid-graphite nanocomposites as phase change materials', Thermochimica Acta, vol. 663, pp. 77-84. en_ZA
dc.identifier.issn 0040-6031 (print)
dc.identifier.issn 1872-762X (online)
dc.identifier.other 10.1016/j.tca.2018.03.014
dc.identifier.uri http://hdl.handle.net/2263/65773
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2018 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Thermochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Thermochimica Acta, vol. 663, pp. 77-84, 2018. doi : 10.1016/j.tca.2018.03.014. en_ZA
dc.subject Phase change en_ZA
dc.subject Thermal energy storage en_ZA
dc.subject Stearyl alcohol en_ZA
dc.subject Stearic acid en_ZA
dc.subject Graphite en_ZA
dc.subject Thermal conductivity en_ZA
dc.subject Single melting en_ZA
dc.subject Crystallization en_ZA
dc.subject Phase change material (PCM) en_ZA
dc.title Stearyl alcohol/palm triple pressed acid-graphite nanocomposites as phase change materials en_ZA
dc.type Postprint Article en_ZA


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