Chemistry
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The structure and synthesis of trimeric and related dimeric Proteracacinidins from Acacia heteroensis.
(University of the Free State, 2002-07)English: The presence of 4', 7,8-trihydroxyl substituted flavanoids in plant material is limited to Acacia galpinii and Acacia caffra in Southern Africa. The existence of pyrogallol-type A-ring oligomers in these trees was ... -
The structure and synthesis of trimeric and related dimeric Proteracacinidins from Acacia heteroensis.
(University of the Free State, 2002-07)English: The presence of 4', 7,8-trihydroxyl substituted flavanoids in plant material is limited to Acacia galpinii and Acacia caffra in Southern Africa. The existence of pyrogallol-type A-ring oligomers in these trees was ... -
Analysis of zirconium containing materials using multiple digestion and spectrometric techniques
(University of the Free State, 2014-10)English: The preparation of pure zirconium metal for nuclear applications is difficult due to the non-reactivity of zirconium minerals, such as zircon. The ability to accurately analyse zirconium-containing materials across ... -
Preparation and characterization of ethylene vinyl acetate copolymer/poly(lactic acid)/sugarcane bagasse composites for water purification
(University of the Free State (Qwaqwa Campus), 2016-01)Excessive release of heavy metals into the environment due to industrialization and urbanization has posed a great problem to the world. Heavy metal ions do not degrade, therefore they can give bad effect to human body ... -
Comparison of the influence of CeYAG and MCM-41 as nanofillers on the properties of polycarbonate and poly( methyl methacrylate)
(University of the Free State (Qwaqwa Campus), 2016-01)This study reports on the morphology of poly( methyl methacrylate) (PMMA) and polycarbonate (PC) filled with mesoporous silica (MCM-41) and cerium doped yttrium aluminum garnet (Ce:YAG) at contents in the range of 0.1 ... -
Totaalsintese en toksisiteit van 'n nuwe 12a-O-metielrotenoied: fitochemie van verwante isoflavonoiede
(University of the Free State, 1976-12)Afrikaans: Hierdie proefskrif behels die chemiese ondersoek van 'n reeks verwante natuurprodukte, waaronder 'n aantal fisiologies aktiewe rotenoïede, uit die bol van Neorautanenia amboensis. Tydens die ondersoek is daar ... -
Preparation and characterisation of polymer composites with bloodmeal
(University of the Free State (Qwaqwa Campus), 2016-01)This research focuses on the fabrication of composites produced by the combination of BM (bloodmeal) with HOPE (high-density polyethylene). HOPE was chosen because it is amongst the most widely used synthetic plastic ... -
Sintese en struktuur van Pirano-isoflavanoïede
(University of the Free State, 1977-01)Afrikaans: Die medisinale gebruik (waarskynlik as antiseptikum) van die bas van Dalbergia nitidula Welw. ex Bak. (Leguminosae) deur inboorlinge het tot die huidige chemiese ondersoek aanleiding gegee. Hierdie ondersoek ... -
Biflavonoied diastereo-isomere en hul biogenetiese voorlopers uit Berchemia SPP.: pogings tot sintese van analoe
(University of the Free State, 1976-02)Afrikaans: Hierdie studie behels die struktuurondersoek, omskakelingsreaksies en pogings tot sintese van sommige van die mono- en biflavonoïede uit die kernhout van Berchernia zeyheri met 'n aanvullende studie op die ... -
Iridium carbonyl complexes as model homogeneous catalysts
(University of the Free State, 2010-05)English: The aim of this study was to investigate model iridium carbonyl complexes as homogeneous catalyst precursors for processes such as olefin hydroformylation. The hydroformylation of alkenes is one of the most ... -
Structural and chemical relationships in metal phosphine complexes relevant to homogeneous catalysis
(University of the Free State, 2010-03)English: The aim of this research work was to improve the fundamental understanding of the role selected tertiary bicyclic and conventional phosphine ligands play in modified cobalt-catalyzed hydroformylation. Selected ... -
Computational and characterization studies of homogeneous and heterogeneous tris(beta-diketonato) complexes with catalytic applications
(University of the Free State, 2017-06)English: Nine [Mn(β-diketonato)3] [β-diketonato = dipivaloymethanato (dpm), 1; acetylacetonato (acac), 2; benzoylacetonato (ba), 3; dibenzoylmethanato (dbm), 4; trifluoroacetylacetonato (tfaa), 5; thenoyltrifluoroacetonato ... -
Synthesis, chemical kinetics, thermodynamic and structural properties of phenyl-containing beta-diketonato complexes of rhodium (I)
(University of the Free State, 2007-01)Abstract available in full text PDF -
Flammability studies on biopolymers and their blends
(University of the Free State (Qwaqwa Campus), 2016-01)The effect of commercial expandable graphite (EG) on the flammability and thermal decomposition characteristics of two systems based on poly(lactic acid) (PLA) and poly(lactic acid)/poly(ε-caprolactone) (PLA/PCL) blend was ... -
Properties evaluation of electrospun alginate-based nanofibrous membranes for filtration applications
(University of the Free State (Qwaqwa Campus), 2016-12)This study entails the electrospinning of a sodium alginate (SA) natural polymer with the aid of an electrospinnable synthetic polymer, polyethylene oxide (PEO), in order to develop nanofibrous-based membranes for wastewater ... -
The constitution of oligomeric benzofuranoids
(University of the Free State, 1999-05)English: Berchemia zeyheri is known for its unique red heartwood, a property that was probably responsible for the first phytochemical investigation into the flavonoid content of this tree. The heartwood contains a unique ... -
New ring closing metathesis based methodology for the synthesis of monomeric flavonoids
(University of the Free State, 2017-02)Although the physiological activity of flavonoids stimulated investigations into more efficient synthetic methods for the preparation of these compounds, many of these routes entail multiple steps and require the utilization ... -
Multiple chromisms associated with dithizone
(University of the Free State, 2016)Ever since discovery of the intensely colored dithizone ligand, H2Dz, in the late 1800s it had been used extensively in aqueous solution trace metal analyses. However, hardly any effort had gone into developing the ... -
Improvement of thermo-switch properties in polyolefin/carbon black composites through the addition of wax
(University of the Free State (Qwaqwa Campus), 2016-03)Conductive polymer composites (CPCs) based on LDPE, HDPE and iPP filled with carbon black (CB) and Zn micro-particles and blended with medium-soft wax were studied. The aim of this study was to investigate the effect of ... -
Encapsulation of selected metallated phthalocyanines in aluminium aminoterephthalate framework, NH₂-MIL-101(Al), with heterogeneous catalytic and hydrogen storage applications
(University of the Free State, 2017-01)English: The amine-functionalised metal organic framework (MOF), NH2-MIL-101(Al) was successfully synthesised and optimised with a benchtop method. A newly developed activation method to evacuate the pores of the MOF, ...
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