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Browsing Natural and Agricultural Sciences by Supervisor "Focke, Walter Wilhelm"
Now showing items 1-19 of 19
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(University of Pretoria, 2008-08-19)Synthetic graphite is an important industrial material, used in nuclear reactors, electrodes and many other applications. Graphitisation of coke is the solid-state transformation of the disordered carbon atoms into a ...
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(University of Pretoria, 2012-11-22)Pitches are important precursors for carbon materials. They are usually obtained by thermal treatment of petroleum and coal fractions. Pitches have higher carbon content and are capable of developing into graphitisable ...
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(University of Pretoria, 2009-12-08)The intercalation of surfactant anions, namely sodium dodecyl sulphate, sodium benzene sulphonate and lauric acid, into commercial layered double hydroxides (LDH-CO3) with approximate composition [Mg0.654AI0.346 ...
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(University of Pretoria, 2009-04-16)Refcoal is a carbon precursor obtained by alkali-mediated extraction of coal with aprotic solvents such as DMF. Refcoal can be converted into a graphitic material through appropriate heat treatment. Graphitisable materials ...
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(University of Pretoria, 2006-09-07)Purging compounds allow for rapid colour and material changes in plastics converting machines. They have both a cleaning and a purging action. The cleaning action refers to the removal of contaminants, e.g. carbon deposits, ...
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(University of Pretoria, 2008)The aim of this research was to develop a solid dosage form containing 1.5 g of the pesticide cypermethrin. The dosage should be stable in a tropical climate. In addition, it is to disintegrate and disperse in 10 L of tap ...
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(University of Pretoria, 2011-10-25)Conventional processes for the manufacture of exfoliated natural vermiculite employ temperatures exceeding 800 °C and the onset temperature is above 450 °C. In many applications, notably fire retardants, it is desirable ...
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(University of Pretoria, 2008)Surfactant-mediated intercalation of aliphatic fatty acids into a commercial,layered double hydroxide (LDH) with the approximate composition of [Mg0.689Al0.311(OH2)] (CO3)0.1569nH2O was explored. The reactions were conducted ...
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(University of Pretoria, 2015)The potential of magnesium hydroxide, hydromagnesite and layered double hydroxides (LDHs) as heat stabilisers and flame retardants for plasticised poly (vinylchloride) (PVC) was studied. These inorganic hydrated fillers ...
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(University of Pretoria, 2003)Please read the abstract in the section 00front of this document
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(University of Pretoria, 2007-03-06)Water-in-oil (w/o) microemulsion systems, stabilised by either an anionic surfactant or a cationic surfactant were studied. The anionic system consisted of ethoxylated nonylphenol phosphate esters (Atpol), Shellsol oil and ...
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(University of Pretoria, 2007-06-18)The energy demands by the industrial world are continuing to rise, while the rate of new oil discoveries is falling. Within the next 30 years, available petroleum supplies are likely to fail to meet the demand, and oil ...
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(University of Pretoria, 2015)Polymeric materials are increasingly used in several applications. However, their relatively high flammability presents a danger to people and property. Their use therefore requires that they are made more resistant to ...
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(University of Pretoria, 2013)The Pebble Bed Modular Reactor (PBMR) is a high temperature graphite-moderated nuclear reactor that uses helium as a coolant. The triple coated (TRISO) particles contain enriched uranium oxide fuel which is coated with ...
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(University of Pretoria, 2007-08-22)Sequential injection analysis (SIA) that was developed in 1990 is a simple, versatile and automated technique based on precise aspiration of small volumes of reagents and samples into a single channel. It is economical in ...
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(University of Pretoria, 2008-08-12)Stearate anions were successfully intercalated into the layered double hydroxide Mg4Al2(OH)12CO3.3H2O (LDH-CO3) by several methods to form LDH-SA. The intercalation method which involved the acid-base reaction between ...
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(University of Pretoria, 2009-12-08)The formation and development of mesophase from different pitches under carbonisation conditions was investigated. Members of the pyrolysis series were prepared from four pitches. A temperature range between 380 and 500°C ...
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(University of Pretoria, 2013)This research aimed to develop technology and processes to further beneficiate two southern African bentonites for applications in polymer/clay nanotechnology. The bentonites were from the Koppies mine in South Africa, ...
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(University of Pretoria, 2012)Titanium dioxide or titania is applied in paints, in the paper industry, fibbers, cosmetics, sunscreen products, toothpaste, foodstuffs, optical coatings, beam splitters and anti-reflection coatings. It is also used as ...
Now showing items 1-19 of 19