Browsing Masters Degrees (Chemistry) by Title
Now showing items 80-99 of 246
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Formulation of the anisotropic coarsening theory and applications to the liquid-phase sintering of Si3N4.
(2002)We have developed a new coarsening theory that more completely describes grain growth of a system of anisotropic particles such as completely faceted crystals by Ostwald ripening. Our model takes the anisotropy of surface ... -
The functionalisation of thenyl carbamates.
(1996)The carbamate functionality has always been associated with a major class of biocides because of its ability to function as an inhibitor of the enzyme acetylcholinetransferase. However, carbamates are not limited to ... -
A green, solvent-free one-pot synthesis of disubstituted quinolines via A3-coupling using 1 mol% FeCl3.
(2016)Quinoline derivatives are important compounds due to their broad range of applications in medicinal, synthetic and industrial chemistry. However, current synthetic techniques such as the classical Skraup, Döebner-Miller, ... -
Growth and physical-chemical properties of carbon nanotube arrays for energy conversion devices.
(2015)Energy demand has been on the increase globally whilst there has been continuous depletion of energy sources. This has prompted investigative research towards sustainable energy through the synthesis of carbon nanotubes ... -
Heterogenisation of selective ethylene tetramerisation catalysts.
(2013-11-27)The aim of the study was to heterogenise existing tetramerisation catalysts by supporting the bis(diphenylphosphino)amine ligands on polymer. The polymer of choice was Merrifield’s resin which was functionalized to enable ... -
Homogeneous dioxoruthenium(VI) catalysts for the oxidation of alcohols.
(2000)Compounds of the form RuO2(Y-py)2CI2 1 (py = pyridine, Y = H, 4-t-Bu, 3-CN, 4-CN, 2-Br, 3-Br, 4-Br, 4-Cl, 4-Me, 4-C(O)C6H5, 3-COOH, 4-COOH), RuO2ZCI2 2(Z = bipyridine, phenanthroline) and RuO2(OH)2(Y-py)2 3 (py = pyridine, ... -
Homoisoflavonids and stilbenoids from Scilla species.
(1998)Bulbs of Scilla natalensis Planch, Scilla nervosa (Burch.) Jessop, Scilla dracomontana Hilliard and Burt and Scilla kraussii Bak. (Hyacinthaceae) were investigated. The plants are widely used by the local African people ... -
Identification and quantification of chelidonic acid and other ligands with potential for Ni uptake in the hyperaccumulator, Berkheya coddii.
(2014)B. coddii is a known nickel hyperaccumulator, a plant that is able to take up high levels of Ni (< 37 000 mg kg -1) without exhibiting toxic effects. It grows in serpentine soil and is endemic to the Barberton Region, ... -
Immunological studies of thymine dimer quantitation.
(1992)Ultraviolet irradiation of DNA induces the formation of a number of mutagenic lesions. The most prolific of these is the cis-syn thymine dimer (formed maximally at 260 nm) and this has been implicated in the reaction ... -
The influence of physicochemical reaction parameters on the synthesis of multi-walled carbon nanotubes for use as catalyst supports.
(2012)Multi-walled carbon nanotubes (MWCNTs) and other shaped carbon nanomaterials (SCNMs) were synthesized by the floating catalyst chemical vapour deposition (CVD) method, using either ferrocene [1] as the catalyst at 2.5 ... -
The influence of surfactants on the solubility of acenaphthene and phenanthrene and their extraction from spiked soils.
(2005)In the first phase of the study, the effect of five Safol surfactants on the aqueous solubility of phenanthrene and acenaphthene was determined. The fixed variables were temperature and ionic strength, while surfactant ... -
Investigating the standard method used by Umgeni Darvill Waste Water Works for the determination of pseudo total metal concentrations in their sewage sludge.
(2016)Abstract available in PDF file. -
An investigation into air stable analogues of Wilkinson's catalyst.
(2014-05-22)Since the discovery of Wilkinson’s catalyst and its usefulness in the homogeneous hydrogenation of olefins many investigations have been carried out on trivalent, tertiary phosphine–rhodium complexes.¹ Studies have shown ... -
An investigation into the antimalarial activity of metal chelators
(2008)Malaria remains one of the greatest problems facing developing nations, especially in sub-Saharan Africa. Part of the problem stems from increased resistance to current treatments hence there is a large drive to develop ... -
An investigation into the influence of substituents and extended π-conjugation on the substitution reactions of bifunctional platinum (II) complexes.
(2015)Abstract available in PDF file. -
An investigation of a heterogeneous aminohydroxylation catalyst.
(2010)Os-Zn-Al hydrotalcite-like compounds (HTlc’s) were synthesised by the co-precipitation method and characterised using different techniques (powder XRD, ICP-OES, FT-IR spectroscopy, BET-surface area measurements, SEM and ... -
An investigation of acetone-photosensitised DNA kinetics.
(1992)Ultraviolet (UV) radiation is a potent DNA-damaging agent and a known inducer of mutations and skin cancer. The increasing incidence of skin cancer has emphasised the importance of understanding the mechanistic ...