Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Chemistry, Physical and theoretical"”.
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Asymmetric hydrogenation catalysed by platinum and iridium
… of this thesis was (a) to gain a greater understanding of the kinetics of asymmetric hydrogenation of methyl pyruvate (MeCOCOOMe) to methyl lactate (MeCH(OH)COOMe) over cinchonidine modified EUROPT-1, (b) to diversify the reaction, by variation of the metal, modifier and reactant and (c) to test …
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Microemulsion and macroemulsion behaviour of systems containing oil, water and nonionic surfactant
… properties of microemulsions with the formation and stability of macroemulsions. Studies have been mainly limited to water-in-oil (W/O) systems stabilised by pure nonionic surfactants of the poly-oxyethylene alkyl ether (CnEm) type. Initially however, a brief account is presented of the behaviour …
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Ultralow interfacial tensions and microemulsion formation in oil-water-surfactant systems
… thesis is concerned with aspects of the surface and colloid chemistry of various oil+water systems containing pure surfactants. In alkane plus aqueous NaCI systems containing the surfactant diethylhexyl sodium sulphosuccinate (AOT) , the alkane-aqueous solution interfacial tension becomes …
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Electroless deposition of group eight metals
… temperature within narrow limits of composition and concentration: small deviations in composition from the optimum results in solution decomposition.Characterisation of electroless palladium-boron coatings indicates that the inclusion of boron decreases the corrosion resistance of the coating. …
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The structure and kinetics of oil-in-water microemulsions stabilised by nonionic surfactants
… the effect of the different constituents n, m, and alkane oil chain length (x).Initially the limiting temperature phase boundaries of the 10 region were established by measurements of turbidity. Turbidity was found to be at a minimum at the lower temperature phase boundary (the solubilisation …
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Solubilisation and emulsification of silicone oils in aqueous surfactant systems
Solubilisation and emulsification of polydimethylsiloxane (PDMS) oils into aqueous surfactant solutions have been investigated with a series of nonionic surfactants and an anionic surfactant (AOT).For nonionic surfactants at oil-water interfaces, the effect of temperature, surfactant structure, …
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Self-organization in systems of anisotropic particles
… of systems is studied, with the goal of understanding both the nonequilibrium and the equilibrium properties of this important process. In Chapter 2, we study the self-assembly of asymmetric Janus colloidal particles. We identify and systematically describe the effect of the ratio of hydrophobic …
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A structural and thermodynamic study of non-aqueous solvent/wax systems
… gel has been assessed via solubility studies and measurement of the solvent vapour pressure. A new technique for the measurement of vapour pressure in these systems has been developed. The operation of the apparatus has been made almost completely automatic by the use of modern control …
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Multi-Photon Spectroscopic Studies of Molecule/Metal Interfaces and Graphene
… studies on molecule/metal interfaces and graphene. Two different aspects of these ultrathin molecular or atomic materials were investigated: (1) the electronic structure of molecule/metal interfaces and (2) nonlinear optical properties of graphene. For the case (1), two-photon …
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Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens
… dye molecule rhodamine 6G adsorbed on graphene, and the type IV pili and c-type cytochromes produced by the dissimilatory metal-reducing bacterium Geobacter sulfurreducens. Although these systems are quite different in some ways, they can all be considered examples of nanomaterials. A …
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The optical cubic susceptibility dispersion of some transparent thin films.
… nonlinear susceptibility dispersion of molecules and polymers in order to estimate their purely electronic nonlinear response and in particular their optical Kerr nonlinear susceptibility in the 1 to 2 μm infrared spectral region. We have been successful in modeling with a four level system the …
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A multireference coupled-cluster method using a single-reference formalism.
… (CC) equations including single, double, triple and quadruple excitations (CCSDTQ) are qraphically derived using Feynman diagrams. These equations are programmed and an iterative reduced linear equation method is used to solve these equations. A few points on the potential curves for the …
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Computers for chemistry and chemistry for computers: From computational prediction of reaction selectivities to novel molecular wires for electrical devices
… of cutting-edge technologies in computational and experimental chemistry, my Ph. D. research aimed to bridge both of these chemical subdivisions. Therefore, while part I of this dissertation focuses on new structure-based computational methodologies to predict selectivities of organic and …
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Coupled-cluster methods for open-shell molecular and other many-fermion systems
… (Ph. D.)--Michigan State University. Dept. of Chemistry, 2010
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Tailoring the (bio)activity of polymeric and metal oxide nano- and microparticles in biotic and abiotic environments
Polymeric and metal oxide micro- and nanoparticles are being increasingly introduced into biomedical applications such as tissue engineering as well as in consumer products, which has boosted extensive research towards developing predictive paradigms of their (bio-)activity. The core hypotheses …
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Study of interaction between polyphenolic compounds and protein using computational and capillary electrophoresis techniques
… of the Degree of Master of Technology: Chemistry, Durban University of Technology, Durban, South Africa, 2012.
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Influence of growth locations on physicochemical properties of starch and flour from amadumbe (Colocasia esculenta) genotypes
… for the Master’s Degree in Food Science and Technology, Durban University of Technology, Durban, South Africa, 2017.
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Functional Imaging Through Dark State Dynamics
… fluorophores, both endogeneous in cells/tissue and externally introduced for mapping of chemical micro-environments including factors such as ion concentration and microviscosity. A novel technique for directly detecting the dynamics and population of dark states, such as the lowest triplet …
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Diffusion related processes in nanoconfined liquids and in proteins under force
… in acetonitrile confined in silica nanopores, and in modeling single molecule forced rupture experiments of biomacromolecules. Based on a method used to calculate the position-dependent diffusion coefficients in inhomogeneous liquids, we apply absorbing boundary conditions in the analysis of …
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Excess molar volume and isentropic compressibility for binary or ternary ionic liquid systems
… of the Degree of Doctor of Technology: Chemistry, Durban University of Technology, Durban, South Africa, 2010.
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