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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 57 for “"Crystal phase"”.
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Solution History Effects and Crystal Phase Transformation in Polybutene-1 and Domain Morphology in Polyurethanes
Isotactic polybutene-1 (PB-1) can crystallize in four different crystal forms in which the molecules assume three different helical conformations. When PB-1 crystallizes from a dilute solution the crystal form which precipitates is determined by the thermal history imposed on the solution and the …
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I. Stereochemical Control of Chiral Assembly and Liquid Crystal Phase Formation of Nonamphiphilic Molecules in Water II. Control Bacterial Quorum Sensing and Quorum Sensing-mediated Activities Using Small Unnatural Molecules
… of stereochemical control on assembly and liquid crystal formation by nonamphiphilic molecules. Three stereoisomers of a disodium chromonyl carboxylate derivative, 5´DSCG-diviol, were designed and synthesized. The chiral stereoisomers formed chiral nematic liquid crystals while the achiral …
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Aerosol Route Synthesis and Applications of Doped Nanostructured Materials
… nanomaterial synthesis in a single-step gas phase reactor to continuously produce doped metal oxides was demonstrated. Copper-doped TiO2 nanomaterial properties: composition, size, and crystal phase) were independently controlled based on nanoparticle formation and growth mechanisms dictated …
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Co-crystal screening of poorly water-soluble active pharmaceutical ingredients. Application of hot stage microscopy on curcumin-nicotinamide system and construction of ternary phase diagram of fenbufen-nicotinamide-water co-crystal system.
… and rapid neutral-alkaline degradation. Co-crystal of curcumin is one option under exploration, motivated by the fact that a number of active pharmaceutical ingredient (API) co-crystals with improved dissolution have recently been synthesized. Hence, co-crystallization technique highlights …
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Development and Evaluation of Photocatalytic Linear Engineered Titanium Dioxide Nanomaterials for the Removal of Disinfection Byproduct Precursors from Drinking Water
… settleability, surface characteristics, crystal phase structure, available surface area, photonic efficiency, and propensity to form hydroxyl radicals. The LENs were also evaluated in terms of their ability to remove disinfection byproduct (DBP) precursors from two natural surface water …
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Investigating the orientational order in smectic liquid crystals.
… The first one is the investigation of a reversed phase sequence, which subsequently leads to the discovery of a novel Smectic-C liquid crystal phase. The 10OHFBBB1M7 (10OHF) compound shows a reversed phase sequence with the SmC∗ d4 phase occurring at a higher temperature than the SmC∗ phase. This …
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ΠΑΡΑΓΩΓΗ ΑΙΘΥΛΕΝΙΟΥ ΜΕ ΚΑΤΑΛΥΤΙΚΗ ΑΤΜΟΠΥΡΟΛΥΣΗ Κ-ΕΞΑΝΙΟΥ
… DUE TO PEROXIDIC OXYGEN THAT IS PRESENT. IN THE CRYSTAL PHASE OF THE CATALYST. A SIMPLIFIED FIRST ORDER MODEL WAS USED TO DESCRIBE THE OVERALL DECOMPOSITION REACTION OF N-HEXANE. A MECHANISTIC MODEL WAS PROPOSED FOR THE SIMULATION OF N-HEXANE THERMAL ANDCATALYTIC CRACKING. THE REACTION THEME …
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Novel Segment Deformable Mirror Based Adaptive Attenuator Used In Wavelength Division Multiplexed Optical Communications Network
… shown that the total electric field and relative phase delay of each beam form a Fourier transform pair. Thus methods and properties of Fourier analysis are applicable in multi-beam interference analysis and design. Fourier transform based design is presented. Novel devices that apply such design …
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Growth of narrow band gap semiconductor nanowires on silicon and graphitic substrates by droplet epitaxy
… axial growth. Furthermore, Sb-induced crystal phase evolution is elucidated as a function of Sb content. Although, pure InAs NWs show a mixture of Wurtzite (WZ) and Zinc-Blende (ZB) phases, a crystal phase evolution from a highly polytypic InAs to a quasi-pure WZ InAsSb NWs (2-4% Sb …
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Gain effect waveguide optical amplifiers for Si microphotonics
… at 4 K, attributed to a metastable FCC or HCP phase. We showed the thermodynamically stable BCC crystal phase has PL emission lines at 1537 nm and 1550 nm, and metastable FCC and HCP crystal phases result in PL emission lines at 1542 nm and 1533 nm. Upconversion coefficient measurements on the …
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Contemporary Problems in Aerosol Aggregation and Gelation
… flow rates. Control of the morphology and crystal phase of the TiO2 was achieved by exploiting the dependencies of monomer sintering and crystal phase transformation on temperature.
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Phase behaviour and crystal nucleation in complex multicomponent system
The continuing research and use of co-crystallisation for separation, purification and modification of pharmaceutical materials in multiple industrial sectors can be attributed to the potential for high control of product quality attributes. Nucleation is a key phenomenon in crystallisation that …
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Application Of Scanning Hall Probe Microscopy For High Throughput Characterization Of Combinatorial Magnetic Materials
… magnetic fields. Specifically, we have studied phase diagrams of Co-Fe-Ni binary and ternary alloys, as well as weak itinerant ferromagnet MnSi. The Co-Fe-Ni alloys were fabricated by annealing three metal blocks placed in intimate contact at high temperatures to allow thermal interdiffusion to …
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Laser photocatalysis.
… in TiO2 were induced on laser irradiation with a crystal phase change from anatase to rutile occurring. In the destruction of methylene blue, the modified TiO2 photocatalyst showed faster initial destruction rate than P25 TiO2. From the results, the laser modified TiO2 appeared to have several …
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An investigation of liquid crystalline and semiconducting blends for applications in photovoltaics
We investigated a number of novel liquid crystalline semiconductors which have been synthesised in house at the University of Hull. The electrochemical and optical properties of these materials were studied, in order to assess their suitability as donor or acceptor materials for photovoltaic (PV) …
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Novel nanomanufacturing methods for bottom-up III-V nanowires and van der Waals epitaxy of monolayer MoS2
… for industrial use. For MoS2, obtaining a single-crystal phase with a wafer-scale uniform monolayer is needed in order for the material to be mass fabricated. Although wafer scale monolayer MoS2 has successfully been grown, it contained a high density of grain boundaries which would cause …
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The confined self-assembly of photonic pigments: from synthetic polymer brushes to sustainable cellulosic colloids
… materials. The first system uses cellulose nanocrystals (CNCs), extracted from wood or cotton, which can self-organise as a cholesteric liquid crystal phase to form a helicoidal nano-architecture that reflects the visible light. CNCs are sustainable and biocompatible, but these large anisotropic …
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Chiral self-assembly of cellulose nanocrystals for photonic films
… example is the self-assembly of cellulose nanocrystals (CNCs) into nanostructured films. CNCs are elongated colloidal particles that spontaneously form a cholesteric liquid crystal phase in aqueous suspension. This helicoidal configuration can be preserved as the suspension dries, resulting in …
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Hyperelastic continuum modeling of cubic crystals based on first-principles calculations
… hyperelastic response of cubic-symmetry single crystals up to large volumetric and deviatoric deformations in the region of stability of the equilibrium crystal phase. For the first time, we combine the formalism of continuum mechanics invariant theory with the predictive capability of quantum …
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