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 40 for “"wide-angle x-ray scattering"”.
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Synthesis and basic characteristics of segmented poly(arylene ether sulfone)-poly(arylate) copolymers
… scanning calorimetry, optical microscopy, and wide angle X-ray scattering were used to probe the copolymer morphology. The chemical structures of the segmented copolymers were studied through the use of Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy (both …
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Pale black dot: a field trip to the multidimensional world of metal halide perovskites
… capabilities at Grazing-Incidence Wide-Angle X-ray Scattering synchrotron facilities via a series of technical developments. We worked our way up from simple static measurements, to in situ lightsoaking and annealing studies, to finally achieve operando full device studies …
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X-ray Scattering Study Of Capillary Condensation In Mesoporous Silica
… by the fluid inside the pores. In-situ small and wide angle x-ray scattering(S/WAXS) were used to study the deformation with respect to relative vapor pressure of the fluid. Periodic mesoporous silica such as MCM-41 and SBA-15 were synthesized and used as the samples with water as the capillary …
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Multiscale Modeling and Mechanistic Analysis of Crystallization and Particulate Processes
… MOFs can be resolved through extended X-ray absorption fine structure (EXAFS); and nucleation and growth of MOF thin films can be resolved with in situ grazing incidence wide-angle X-ray scattering (GIWAXS) coupled with mechanistic modeling; and that continuum-scale crystal size …
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Studies of blends containing liquid crystalline polymers with PET and related investigations of hydroquinone/biphenol polysulfone systems
… analysis, polarizing hot-stage microscopy, wide angle x-ray scattering and mechanical testing were utilized in this investigation
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Thermodynamical, structural, and dynamical characterization of solvent mixtures of technological interest: experimental and computational studies
… by using molecular) dynamics (MD) simulations, wide angle X ray scattering experiments, and density measurements. The reason of why a density maximum is observed experimentally is explained. As an extension of the previous study we further investigated NMP Water mixtures by a combined use of NMR …
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Morphological studies of polymeric systems with liquid crystalline order
… (TEM), atomic force microscopy (AFM), small angle X-ray scattering (SAXS), and wide angle X-ray scattering (WAXS) are the tools employed. Two-dimensional Ndel inversion walls formed in a nematic monodomain during magnetic realignment of a highly elastically anisotropic thermotropic liquid …
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Determining the role of charges in ionic polymer blend systems
… optical microscopy (POM) and grazing-incidence wide-angle x-ray scattering (GI-WAXS). From DSC, the blends were found to melt at the same temperatures as the homopolymers but crystallize at much lower temperatures (at least a 20°C shift) due to slower kinetics. The blend kinetics were studied …
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Melting and crystallization studies in a partially excluding copolymer
… then studied using hot stage optical microscopy, scattering (small and wide angle X-ray scattering) and thermal analysis techniques (differential scanning calorimetry). It has been demonstrated that, upon changing from an alternating to a non-alternating structure, substantial amounts of 224 …
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Semiconductor nanocrystal colloids : manganese doped cadmium selenide, (core)shell composites for biological labeling, and highly fluorescent cadmium telluride
… are characterized by absorption, emission, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), small angle X-ray scattering (SAXS), and wide angle X-ray scattering (W AXS). The maximum quantum yield is achieved when the core is protected from oxidation by a complete …
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High Shear Flow Properties of Nanocellulose
… analysis using atomic force microscopy (AFM), wide-angle x-ray scattering (WAXS), and conductometric titration assist identification of morphological and chemical changes that affect the CNMs after they have been subjected to industry-relevant shear rates. These studies demonstrate that …
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Rheological characterizaton, and the development of molecular orientation and texture during flow for a liquid crystalline copolymer of para- hydroxybenzoic acid and polyethylene terephthalate
… which develops during shear flow. However, wide angle x-ray scattering (WAXS) and scanning electron microscope (SEM) studies reveal that shear flow has little effect on the development of molecular orientation during flow. In addition, any orientation produced during flow may be lost within …
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Effect of intermediate solvents on poly(ether ether ketone)
… differential scanning calorimetry (DSC), and wide angle X-ray scattering (WAXS). Dynamic solvent uptake measurements were performed on each film with the three solvents. Methylene chloride swelled both amorphous and semi-crystalline PEEK to high degrees, while tetrahydrofuran and acetone …
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Elevated temperature mechanical properties of line pipe steels
… phase analyses were performed using synchrotron wide-angle x-ray scattering. Both pipeline steels exhibited evidence of DSA under similar testing conditions. The DSA temperature regime for the X70 steel was slightly smaller than the DSA regime for the X52 steel. Manifestations of DSA during …
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Growth dynamics, charge density, and structure of polyamide thin-film composite membranes
… diffuse reflectance spectroscopy, Rutherford backscattering spectrometry (RBS), and atomic force microscopy (AFM); (2) quantifying the effects of trimesoyl choride (TMC) and m-phenylenediamine (MPD) monomer concentrations on the polyamide charge concentration in the near-surface region by X-ray …
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Novel carbon materials with hierarchical porosity : templating strategies and advanced characterization
… materials were studied in detail using a novel wide-angle x-ray scattering model that allowed precise information about the nature of the carbon building units (graphene stacks). Different carbon precursors were evaluated regarding their potential use for the synthesis shown in this work, …
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Solution Conformations and Structural Thermodynamics of Type I DNA Polymerases from Escherichia coli and Thermus aquaticus
… (analytical ultracentrifugation) and small/wide angle X-ray scattering techniques and then compared to their known crystal structures to assess the similarities and differences in the overall structure of these enzymes and enzyme complexes within a solution environment. These studies address …
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The Effect of Morphology on Carrier Dynamics in Solution Processed Solar Cells
… ring on the side chain yet Grazing Incidence Wide Angle X-ray Scattering measurements show a significant change in their packing. It is proposed that the decrease in packing distance with the addition of the thiophene ring is responsible for the measured increase in mobility of PBDTTT-EFT …
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Exciton Dynamics in Organic and Inorganic Nanoscale Materials
… explored through fluorescence measurements and wide angle X-ray scattering to demonstrate that the increase in quantum yield is associated with a change of structure. This leads to the development of a population of shielded or trapped excitons due to the formation of large polarons. …
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Investigation of Phase-Separated Polymeric Materials via X-ray Scattering Techniques
… characterization via ultra-small, small, and wide-angle X-ray scattering methods (USAXS/SAXS/WAXS). Specifically, these experimental techniques are employed to investigate the phase separated morphologies that impart unique properties to each class of materials and allow for their use in …
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