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Browsing by UP Author "Badenhorst, Heinrich"
Now showing items 1-19 of 19
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Badenhorst, Heinrich (3rd Southern African Solar Energy Conference, South Africa, 11-13 May, 2015., 2015)Paper presented to the 3rd Southern African Solar Energy Conference, South Africa, 11-13 May, 2015.
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Focke, Walter Wilhelm; Badenhorst, Heinrich; Mhike, Washington; Kruger, Hermanus Joachim; Lombaard, Dewan (Elsevier, 2014-05)Thermal analysis and other techniques were employed to characterize two expandable graphite samples. The expansion onset temperatures of the expandable graphite’s were ca. 220 °C and 300 °C respectively. The key finding ...
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Badenhorst, Heinrich; Focke, Walter Wilhelm (Elsevier, 2013-11)Two unidentified powdered graphite samples, from a natural and a synthetic origin respectively, were examined. These materials are intended for use in nuclear applications, but have an unknown treatment history since ...
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Badenhorst, Heinrich; Cabeza, Luisa F. (Elsevier, 2017-04)Energy storage is a key challenge to a sustainable energy supply. To design new storage systems accurate and representative thermal property measurements are essential. The T-history method is quick and uncomplicated, ...
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Bohmer, Thomas Simon; Sonnendecker, Paul Walter; Badenhorst, Heinrich (Elsevier, 2019-06)Additive manufacturing (3D printing), combined with computer aided design, is transforming the modern manufacturing industry. Using high temperature techniques such as “selective laser sintering”, fabricators are given ...
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Badenhorst, Heinrich; Rand, Brian; Focke, Walter Wilhelm (Elsevier, 2013-06)The ICTAC-recommended approach was used to characterize the gasification of high-purity, highly crystalline, large natural graphite flakes in oxygen. The average activation energy was found to be 157.7 ± 4.2 kJ mol−1. ...
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Badenhorst, Heinrich; Focke, Walter Wilhelm (Springer, 2012-06)The oxidation, in a neat oxygen atmosphere, of high-purity and highly crystalline natural graphite and synthetic Kish graphite was investigated. The physico-geometric model function of the kinetic rate equation was ...
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Focke, Walter Wilhelm; Badenhorst, Heinrich; Ramjee, Shatish; Kruger, Hermanus Joachim; Van Schalkwyk, Riaan; Rand, Brian (Elsevier, 2014-07)Graphite foams were prepared from a coal tar pitch that was partially converted into mesophase. Expandable graphite was used instead of an inert gas to ‘‘foam’’ the pitch. The resulting foam was subjected to a series of ...
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Badenhorst, Heinrich (Taylor and Francis, 2017-02)The deductions regarding the differences and similarities between natural and synthetic graphite would not have been possible without the combination of oxidation and high surface resolution SEM. The true behaviours of ...
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Van Heerden, Xandra; Badenhorst, Heinrich (Elsevier, 2015-07)The characteristics of exfoliated graphite derived from three intercalation methods: gas phase intercalation of iron (III) chloride, modified Hummers method and an electrochemical technique, were compared. Despite the ...
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Badenhorst, Heinrich (Elsevier, 2014-01)The estimation of the active surface area (ASA) of various macrocrystalline graphitic materials is industrially valuable but the microstructures of these materials are still contestable. This in turn has led to difficulties ...
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Badenhorst, Heinrich; Rand, Brian; Focke, Walter Wilhelm (Springer, 2010)A natural graphite recommended for use in nuclear applications was analyzed using thermogravimetric analysis. The oxidation behaviour was unlike that expected for flake-like particles. The dynamic data displayed an apparent ...
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Badenhorst, Heinrich (Elsevier, 2016-11)This study presents an innovative new alternative for utilizing phase change materials as energy storage media in solar power towers. The solar power tower prilling or granulation concept combines the existing molten ...
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Badenhorst, Heinrich; Sandrock, Carl (Elsevier, 2016-05)Rapid thermal conductivity measurement of porous solids and composites remains a challenge. A modified steady state technique has been proposed which uses two heat flux sensors instead of one. The parameter estimation ...
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Badenhorst, Heinrich (Elsevier, 2013)The active surface area progression which takes place in natural graphite flakes during oxidation is difficult to model analytically. A probability based simulation was developed to represent the observed behaviour. The ...
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Badenhorst, Heinrich (Elsevier, 2015-09)The characterization of thermal properties continues to be a challenge facing the development of composite phase change materials. To overcome the practical issues of current techniques a new experimental method was ...
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Delport, Matthys R.; Badenhorst, Heinrich (Springer, 2016-07)The objective of the investigation was to produce a high mesophase content pitch from low cost anthracene oil without the use of catalysts. The pitch product was then used to produce graphitic artefacts using only a low ...
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Mhike, Washington; Focke, Walter Wilhelm; Mackenzie, Jodi; Mills, Edward J.; Badenhorst, Heinrich (Elsevier, 2018-05)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 ...
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Badenhorst, Heinrich; Fox, Natasha; Mutalib, Ashraf (Elsevier, 2016-04)Graphite foams of varying composition and density were prepared using a low cost, local pitch material and expandable graphite for use in solar energy capture. The foams have a high degree of graphitization but exhibit ...
Now showing items 1-19 of 19