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 11 of 11 for “"transmission X-ray microscopy"”.
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An Investigation of the Microstructure and Properties of a Cryogenically Mechanically Alloyed Polycarbonate-Poly(Ether Ether Ketone) System
… using a variety of techniques including microscopy and thermal analysis. Cryogenically mechanically alloyed powders processed for 10 hours were shown to have a sub-micron level two-phase microstructure. These powders were processed into testable coupons using a mini ram-injection molder; …
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The productive reuse of coal, biomass and co-fired fly ash
… characterization of these materials by scanning transmission X-ray microscopy analysis revealed the heterogeneity of the aluminosilicate phase composition of the co-fired fly ash geopolymer gel at the nano- to micro-scale.
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Physical and Chemical Properties of Matrix in Primitive Chondrites
… of discrete grains in their matrix. Micro X-ray diffraction was also used for mineralogical phase identification of the matrix constituents allowing the estimation of their modal mineralogy. MIL 0768 and Acfer 094 were also investigated using Scanning Transmission X-ray Microscopy (STXM) …
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Investigation of Size Specific Fe2O3 nanoparticles: Towards Single Nanoparticle Resolved Spectro-ptychography
… ptychography imaging detector is sensitive to X-rays at this energy. Therefore, iron oxide nanoparticles were ideal to study with spectro-ptychography and to identify challenges within the acquisition, dataflow, and analysis. Here, we first compare conventional Scanning Transmission X-ray …
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Photochemical transformation of particulate organic carbon and its impact on mercury cycling in aqueous systems
… state were performed using synchrotron-based X-ray adsorption spectroscopy (XAS) and scanning transmission x-ray microscopy (STXM). These revealed a marked decrease in POM-reduced sulfur following irradiation, leading to fewer R-SH groups capable of strongly binding Hg. However, decreased Hg …
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Correlated NanoSIMS, TEM, and XANES Studies of Presolar Grains
… Secondary Ion Mass Spectrometry (NanoSIMS), Transmission Electron Microscopy (TEM), and Scanning Transmission X-ray Microscopy (STXM) utilizing X-ray Absorption Near Edge Structure (XANES), with a focus on connecting these correlated laboratory studies to astrophysical phenomena. The …
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Tiny Space Magnets: X-ray Microscopy and Nanopaleomagnetism of Meteoritic Metal
… microstructures was imaged using synchrotron X-rays. Magnetic contrast is generated using X-ray magnetic circular dichroism. The dimensions of tetrataenite islands within the cloudy zone directly correlate with cooling rates. Cooling rates vary from ~0.5–10,000°C/Myr and correspond to island …
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Diffraction and Spectroscopy of Marine Calcite Biominerals: Insights into Structure and Geochemistry
… Amphistegina lessonii using scanning transmission X-ray microscopy (STXM). Na in the test of A. lessonii is incorporated in a spatially heterogeneous manner, showing banding in a mode comparable to that seen previously for B and Mg. The near edge X-ray absorption fine structure …
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Effect of Surface Moisture Condition on Substrate-Repair Concrete Overlay Transition Zone
… or qualitative in nature. In recent years, transmission X-ray microscopy (TXM) has been employed to non-destructively track diffusion and develop diffusion coefficients. The work presented in this thesis surrounds the efforts of incorporating TXM experiments at Virginia Tech. This work …
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Durability of Cementitious Materials in Arctic Regions: Investigating Freeze-Thaw Damage and Chloride Ingress Diffusion Mechanisms
… also utilized a non-destructive technique, transmission X-ray microscopy (TXM), to quantify the diffusion coefficient (Dc) as a function of F-T cycles for the first time in the literature. The results emphasize the importance of the air void system in reducing F-T damage and chloride …
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Design and synthesis of Ni-rich and low/no-Co layered oxide cathodes for Li-ion batteries
… evolution of the LNO cathode. We use in situ transmission X-ray microscopy (TXM) to track the Mn tomography inside the LNO particle and Ni oxidation state evolution at various temperatures below 700 °C. We further reveal chemical and structural changes induced by different extents of Mn …