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 16 of 16 for “"Crystalline particles"”.
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Post precipitation treatment of copper sulphide particles to improve settleability
In various attempts at producing metal sulphide particles from synthetic solutions, prodigious quantities of nuclei which grow only to colloidal dimensions have been frequently reported. This copious nucleation is promoted by high levels of supersaturation which characterises most precipitation …
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Optical and Electronic Properties, Nanoscale Structural Order, and Transformation Kinetics of Phase Change Materials
… have supercritical nuclei that later grow into crystalline grains. The crystallization speeds of the annealed states are indeed higher than that of the as-deposited states. The greatly different effects of annealing on Ge2Sb2Te5 and AgInSbTe were explained by the difference in the nucleation …
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Computer simulation of confined and flexoelectric liquid crystalline systems.
… Thesis, the study of confined systems of liquid crystalline particles has been addressed. Computation of the anchoring phase diagrams for three different surface interaction models showed that the hard needle wall and rod-surface potentials induce both planar and homeotropic alignment separated …
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Surface Functionalisation and Characterisation of Cellulose Nanocrystals
… nanocrystals (CNCs) are elongated nanoscale crystalline particles able to be extracted from cellulose. They are noted for their combination of strength, stiffness, low density, and biodegradability, as well as emergent properties, such as forming birefringent liquid crystals. CNCs have found …
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Liquid crystal films confined between patterned substrates.
… thesis, the study of confined systems of liquid crystalline particles has been addressed. Using the hard needle wall and hard gaussian overlap potentials, homeotropic and planar alignment of model molecules on the substrates has been induced. We have then extended the study of confined liquid …
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Cubosome and Hexosome Microparticles: Shape, Rheology, and Templating
Cubosomes and hexosomes are soft particles of cubic and hexagonal phases, formed by self-assembled amphiphilic lipids. They have attracted great attention because of applications in drug delivery. Cubosomes and hexosomes have been produced at the nanoscale, exhibiting unique shapes and symmetries, …
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Excited State Dynamics of Dyes Bound to Nanocrystals
… end, colloidal nanocrystals (NCs), which are crystalline particles dispersed in a solvent medium, are used. These colloidal NCs present a more homogenous environment for dye-binding, and this reduced heterogeneity can make it easier to elucidate the molecular excited-state dynamics. In …
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Nichtwässrige Synthese und Bildungsmechanismus von Übergangsmetalloxid-Nanopartikeln = Nonaqueous synthesis of transition-metal oxide nanoparticles and their formation mechanism
… synthesis of binary and ternary metal oxide nanoparticles is investigated for a number of technologically important materials. A strong focus was put on studying the reaction mechanisms leading to particle formation upon solvothermal treatment of the precursors, as an understanding of the …
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An Investigation Into The Mineral And Mechanical Properties Of The Canine Intervertebral Disc And Its Clinical Implications
… state within the disc and that the formation of crystalline particles of hydroxyapatite occurs prior to disc extrusion. AFM identified crystalline agglomerates consistent with hydroxyapatite as well as extracellular matrix structures such as individual collagen fibres, in addition to …
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Green synthesis of Europium (III) Oxide nanoparticles using Hibiscus sabdariffa flower extract
… order to obtain biocompatible and harmless nanoparticles. Green chemistry approach is the eco-friendly process which has taken the researchers attention globally due to its advantages over conventional methods. This ecological method has potential in transforming the inorganic metal ions into …
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Controlled emulsion droplet solvent evaporation for particle production
… work, we are motivated by the need to produce particles of well-controlled size, shape and morphology for general application in catalysis, environmental remediation, nanomedicine, pharmaceuticals, the development of new materials, and other fields. Moreover, our approaches are guided by the …
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A novel view on the early stage of crystallization
… at this pH-value. Nucleated calcium carbonate particles are amorphous at first and subsequently become crystalline. At high binding strength in clusters, only calcite (the thermodynamically stable polymorph) is finally obtained, while with decreasing binding strength in clusters, vaterite (the …
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Mechanisms of Microbial Formation and Photodegradation of Methylmercury in the Aquatic Environment
… molecules, polynuclear clusters, amorphous nanoparticles and after long term aging, bulk-scale crystalline particles. The methylation potential of these mercury species were examined using both pure cultures of SRB and sediment slurry microcosms. The results of these experiments indicated that …
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Ultra-fine particle formation using principle of rapid expansion of supercritical solutions`
… industries that the reduction in size of a crystalline particle can lead to better performance of the drug compound, particularly for water insoluble drugs, in the final dosage form. Many particle formation techniques have been investigated in recent years by researchers to obtain desired …
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Synthesis and characterization of N-alkylthiourea and N, N -dialkylthiourea complexes of Cu, Cd and Pb, and their use as single source precursors for the synthesis of metal sulfide nanoparticles
… to prepare surface capped metal sulfide nanoparticles. Some of the complexes have been used as single-source molecular precursors in the preparation of copper sulfide, cadmium sulfide and lead sulfide nanoparticles by a process driven by thermal decomposition. Good crystalline particles were …