Chemistry
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Chemical analysis and evaluation of a homemade pest control mixture used by a local farmer from Maloti-A-Phofung municipality of the Afromontane region in the Free State
(University of the Free State, 2022)The indigenous community of the Afromontane region has developed and adopted strategies for survival to reduce diseases and eliminate ticks and pests on crops at a lower cost. Biopesticides are efficient in eradicating ... -
A review on graphene (GN) and graphite oxide (GO) based biodegradable polymer composites and their usage as selective adsorbents for heavy metals in water
(MDPI, 2023)Water pollution due to heavy metal ions has become a persistent and increasing problem globally. To combat this, carbonaceous materials have been explored as possible adsorbents of these metal ions from solution. The problem ... -
Tuneable blue to orange phosphor from Sm3+ doped ZnAl2O4 nanomaterials
(Elsevier, 2022)Undoped and Sm3+ doped ZnAl2O4 nanopowders were synthesized using the co-precipitation method and annealed at 750 ℃ for 3.5 h. The aim of this study was to investigate the effect of varying the Sm3+ concentration on the ... -
A crystallographic investigation of multidentate ligand hafnium(IV) halido complexes
(University of the Free State, 2021-11)Hafnium, the chemical element with atomic number 72 in the titanium-triad on the periodic table, was first discovered by Dirk Coster and George von Hevesy in 1923 by analysing X-Ray spectra of Norwegian zircon samples (sea ... -
Spectroscopic behaviour of copper(II) complexes containing 2-hydroxyphenones
(MDPI, 2022)Theoretical investigations by density functional theory (DFT) and time-dependent DFT (TD-DFT) methods shed light on how the type of ligand or attached groups influence the electronic structure, absorption spectrum, electron ... -
Thermal fractionation and properties of different PE/wax blends
(University of the Free State, 2005-12)The influence of paraffin wax type and content on the properties of its blends with HDPE, LOPE and LLDPE was investigated. Differential scanning calorimetry, thermal fractionation and surface free energy results were used ... -
Redox data of tris(polypyridine)manganese(II) complexes
(MDPI, 2022)Very little cyclic voltammetry data for tris(polypyridine)manganese(II) complexes, [MnII(N^N)3]2+, where N^N is bipyridine (bpy), phenanthroline (phen) or substituted bpy or phen ligands, respectively; are available in the ... -
Preparation and characterization of EVA-sisal fibre composites
(University of the Free State, 2005-01)The main focus of this research project was on sisal fibre as organic filler and the effect of its content on the thermal and mechanical properties of EVA. Sisal is a promising reinforcement for use in composites on account ... -
Preparation and characterization of EVA-wood fibre composites
(University of the Free State, 2006-04)Ethylene vinyl acetate copolymer (EVA) and wood fibre (WF) composites, compatibilized with ethylene-glycidyl methacrylate copolymer (EGMA) were investigated. The study is divided into two systems, i.e. EVA-WF (uncompatibilized ... -
The influence of oxidized paraffin wax on the physical properties of LLDPE/wax and LDPE/wax blends
(University of the Free State, 2002-02)In this work, the characterization, thermal and mechanical properties of mechanically and extrusion mixed LLDPE/wax and LDPE/wax blends were investigated. Mechanically and extrusion mixed samples were melt pressed into ... -
Thermal and mechanical properties of polymers filled with copper powder
(University of the Free State, 2005-02)The aim of this study was to prepare LOPE-Cu and LLOPE-Cu composites containing different amount of copper, and to determine the morphology, surface free energy, thermal and mechanical properties, as well as thermal and ... -
Contribution to preparation of polymer conjugates containing ferrocene derivatives
(University of the Free State, 2000-11)Cancer is one of the major killer-diseases in the whole world. It is a well known fact that the causes of cancer vary from person to person, they include, inter alia, exposure to carcinogenic substances like smoking, ... -
The influence of types and amounts of wax on the thermal and mechanical properties of PE/Wax blends
(University of the Free State, 2005-11)The influence of three different waxes on the thermal and mechanical properties of lowdensity (LOPE) and linear low-density (LLDPE) polyethylenes was investigated. The samples were prepared through melt blending in a ... -
Influence of the presence and amount of metal nanoparticles on the thermal and mechanical properties of iPP/soft paraffin wax phase change materials for thermal energy storage
(University of the Free State, 2014-12)Nanocomposites based on iPP and an iPP/wax phase change blend with Ag nanoparticles were studied. The aim of this study was to correlate the thermal and electrical conductivity, as well as dynamic mechanical properties, ... -
The effects of peroxide treatment on composites of linear low density polyethylene and short sisal fibre
(University of the Free State, 2003)In this work sisal fibre (Agave sisalana) was used as reinforcement in LLDPE-sisal fibre reinforced composites. In recent years there has been an increasing interest in finding new applications for sisal fibre as reinforcement ... -
Photocatalytic decomposition of an ago dye using transition-metal-doped tungsten and molybdenum carbides
(American Chemical Society, 2022)The preparation, characterization, and photocatalytic application of tungsten or molybdenum carbides (Ni-WC, 1, Co-WC, 2, Ni-MoC, 3, Co-MoC, 4, NiCo-WC, 5, NiCo-MoC, 6, NiFe-WC, 7, and NiFe-MoC, 8) doped with transition ... -
Trends in coordination of rhenium organometallic complexes in the Protein Data Bank
(IUCr, 2022)Radiopharmaceutical development has similar overall characteristics to any biomedical drug development requiring a compound's stability, aqueous solubility and selectivity to a specific disease site. However, organometallic ... -
Kinetic study of the crystallization of LLDPE and wax in LLDPE/wax phase change blends used for thermal energy storage
(University of the Free State, 2014-12)The main purpose of this research was to kinetically study the influence of each component in an LLD PE/wax blend on the crystallization behaviour of the other component, and also to evaluate the effectiveness of wax as a ... -
Investigation of thermal and physical properties of crosslinked LLDPE/w ax blends in the presence of dibenzoyl peroxide
(University of the Free State, 2002-01)In this work, the thermal and mechanical properties of uncross-linked and cross-linked LLDPE/wax blends were investigated. The mechanically mixed samples were melt-pressed into sheets, from which the analyses were done. ... -
UV-Vis spectroscopy, electrochemical and DFT study of tris(β-diketonato)iron(III) complexes with application in DSSC: role of aromatic thienyl groups
(MDPI, 2022)A series of tris(β-diketonato)iron(III) complexes, with the β-diketonato ligand bearing different substituent groups, have been synthesized and characterized by Fourier transform infrared (FT-IR), ultraviolet-visible ...
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