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 76 for “"pXRD"”.
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Quantification of fatigue damage in AISI 316L stainless steel using X-Ray powder diffraction (XRD)
… examination Power X-ray diffraction (PXRD). In industry, the evaluation of material deformation post cycling loading is often performed using microscopic techniques such as transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD). However, each of these …
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An investigation into the synthesis, structural characterisation, thermal and polymorphic behaviour of organic crystalline materials
… techniques via powder X-ray diffraction (pxrd) has played an ever increasing pivotal role. In this thesis a number of new multi-component materials; oxamic acid:nicotinamide, oxamic acid:isonicotinamide, fumaric acid:nicotinamide, maleic acid:nicotinamide and maleic acid:isonicotinamide, …
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Crystal engineering of mixed-ligand metal-organic frameworks
… temperature powder X ray diffraction (VT PXRD) analysis showed that the crystallinity of the compound was retained and the crystalline phase remained unchanged as the temperature was increased. Variable temperature single crystal X ray diffraction (VT SCXRD) analysis of 1 revealed that the …
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Enhancing the study of battery degradation using machine learning to get more out of data
… automatically analyse powder X-ray diffraction (PXRD) data and extract structural information from diffraction patterns in real time. This approach is validated on a real dataset of PXRD patterns collected on a cycling LiNi<sub>x</sub>Mn<sub>y</sub>Co<sub>(1-x-y)</sub>O<sub>2</sub> (NMC) cathode. …
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The co-crystallisation of sugars by the supersaturation process
… Calorimetry (DSC) and powder x-ray diffraction (PXRD). DSC analysis allowed information to be obtained on the thermal behaviour of the various co-crystalline materials, whilst PXRD permitted information on the structural aspects of the materials to be gained. These two forms of analysis were …
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Crystal isostructurality and X-ray diffraction studies of cyclodextrin inclusion compounds
… is an update on the isostructurality method of PXRD analysis (lsoPXRD), the last update having been published in 2001 The scope of the isostructurality part of this dissertation includes organic inclusion complexes of all three natural cyclodextrins (a-,
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Solubility Improvement by Solid Dispersion and Their Characterization: Indomethacin and Phenytoin
… Calorimetry (DSC), X-Ray Powder Diffraction (PXRD), Scanning Electron Microscopy (SEM) and in vitro dissolution studies. The DSC data showed thermograms for all the ingredients, physical mixtures and solid dispersions. It indicated that the physical mixtures tend to have the drugs in their …
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Evaluation of Dose-Exposure-Response Relationships of Miltefosine and Discovery of Multicomponent Crystal Forms of Artesunate
… characterised using Powder X-ray Diffraction(PXRD), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TGA), and Fourier Transform Infrared Spectroscopy (FTIR). Dehydration studies were performed in an oven at a specific temperature of 120°C for varying durations (24h to …
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The design and synthesis of mixed ligand metal organic frameworks for xylene inclusion
… (SCXRD) and powder X-ray diffraction (PXRD). Xylene inclusion experiments were performed on the MOFs and the resulting inclusion compounds were characterized using TGA, SCXRD and PXRD.
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Synthesis and Characterisation of Porous Mixed-Ligand Metal-Organic Frameworks for Sorption Studies
… diffraction (SCXRD), powder X-ray diffraction (PXRD) and variable temperature (VT-PXRD). The thermal stability of MOFs was determined using thermogravimetric analysis (TGA) and hot stage microscopy (HSM). SCXRD revealed that LMMOF01 and LMMOF03 are 3-D, LMMOF02 is 2-D while LMMOF04 and LMMOF05 …
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In situ study of Co₃O₄ morphology in the CO-PROX reaction
… in the in situ UCT-developed magnetometer and PXRD capillary cell instruments by induced reduction at temperatures between 50 and 450°C. Catalyst tests showed two distinct temperature regions with maximum activity. In the range of 150 – 175ᵒC, activity decreased from nanoparticles > amine …
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MULTIVARIATE FLEXIBLE METAL ORGANIC FRAMEWORKS: THE ROLE OF FUNCTIONALIZED LINKERS, HETEROGENEITY AND DEFECTS IN ADSORPTION PROCESSES
… high-resolution powder X-ray diffraction (HR-PXRD), advanced gas adsorption measurements and Monte Carlo simulations. In particular, the host-guest interactions during CO2 adsorption were studied via in situ HR-PXRD dosing CO2 in certain pressure ranges at different temperatures and compared …
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Crystallisation thermodynamics and random forest classification for the prediction of crystallisation outcomes
… considered by Powder X-ray Diffraction (PXRD)patterns. The solubility and nucleation of MFA were also explored in this thesis in an attempt to understand the thermodynamic and kinetic interactions during the crystallisation process of MFA. It was observed that the nucleation of MFA in …
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Design and synthesis of new materials for the protection, restoration, and conservation of carbonate stone artifacts of interest in the field of Cultural Heritage.
… characterised using FT–IR, 1H, 13C, and 31P NMR, PXRD, elemental analysis, and where possible, single–crystal X–ray diffraction (SC–XRD) and 3D electron diffraction (3D–ED). Their reactivity with calcite was tested by reacting them with calcium carbonate powder, and the resulting phases were …
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Macroporous Semiconductors Tantalum Oxide, (Oxy)nitride and Nitride for Photocatalytic Hydrogen Evolution
… was obtained by powder X-ray diffraction (PXRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM), BET surface area measurement and UV-Vis reflectance and absorbance spectroscopy. Pore sizes of macroporous Ta2O5, TaON and Ta3N5 are 370±10, 380±10 and 400±10 nm, …
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Macroporous Semiconductors Tantalum Oxide, (Oxy)nitride and Nitride for Photocatalytic Hydrogen Evolution
… was obtained by powder X-ray diffraction (PXRD), scanning electron microscopy(SEM), transmission electron microscopy (TEM), BET surface area measurement and UV-Vis reflectance and absorbance spectroscopy. Pore sizes of macroporous Ta2O5, TaON and Ta3N5 are 370±10, 380±10 and 400±10 nm, …
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Drug-Polymer and Drug-Lipid Miscibility for the Development of Amorphous Solid Dispersions and Solid Lipid Nanoparticles
… were characterized by powder X-ray diffraction (PXRD). Molecular interactions were determined using infrared and Raman spectroscopy and molecular modeling using Jaguar. Polymer precipitation inhibition efficiency and dissolution studies were conducted at 0.1 mg/mL and 0.05 mg/mL (70:30 …
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Design of Robust Heterogeneous Catalysts for Sustainable Chemistry
… materials were characterized (TGA, FT-IR, NMR, PXRD and TEM) and applied in catalytic hydrogenation reactions. The activity of the catalysts was found low because of the silicidation of metal and non-porous SiCN support. The issues of the low porosity of SiCN ceramics and the formation of metal …
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Encapsulation of iron(III) protoporphyrin IX and tetraphenylporphyrin in metal-organic frameworks for application as heterogeneous oxidation catalysts
… uptake by 2 was much lower (2 ± 1 mg.g-1 ) and PXRD indicated structural instability on exposure to water was the likely cause. Two methods for Fe(III)PPIX incorporation into 1 were investigated: soaking and encapsulation. Encapsulation was verified by SEM-EDS and showed comparable …
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In situ High Pressure and Temperature 13C NMR for the Study of Carbonation Reactions of CO2
… ex situ analysis on carbonate products using pXRD, Raman, and MAS NMR. Detailed discussion outlines how to use 13C NMR to study CO2 mineralization reactions.</p>
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