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 30 for “"X-ray microscopy"”.
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Nanoscale imaging of MXenes by X-ray microscopy
… with aqueous electrolytes. Scanning X-ray Microscopy (SXM) is a suitable technique for the investigation of the surface and core chemistry of MXenes, particularly for capturing post mortem the intercalation mechanisms of a Li-ion battery and during exposure to varying conditions …
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Data-driven Synchrotron X-ray Microscopy Characterization of Functional Thin Films
… electronics, and optics. Synchrotron X-ray microscopy offers spatially resolved, elementally sensitive mapping of materials structure at the nanoscale. Nonetheless, traditional data analysis methods struggle to process the high-dimensional datasets efficiently and precisely, often …
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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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High-bandwidth high-precision robust x-ray microscopy - a control systems approach
… positioning stages of Velociprobe X-ray microscope at Advanced Photon Source (APS) at Argonne National Laboratory (ANL) is presented. In particular, our focus is on maintaining a precise position of the optics scanning stages in the XY lateral plane relative to the sample stages, …
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Measurement of in situ protein concentrations in lymphatic capillaries by ultrasoft X-ray microscopy
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Biology, 1969.
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Scanning standing-wave illumination microscopy : a path to nanometer resolution in X-ray microscopy
X-ray microscopy can potentially combine the advantages of light microscopy with resolution approaching that of electron microscopy. In theory, x-ray microscopes can image unsectioned hydrated cells with nanometer resolution. In practice, however, the resolution of x-ray microscopes is limited to …
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Applications of Machine Learning to the Petrographic Analysis of Icelandic Gabbroic Xenoliths through Light, Electron and X-ray Microscopy
… segmentation of individual crystals fromoptical microscopy scans of thin sections; in this case focussing on Plagioclase crystals only.The second chapter builds on recent developments for the use of unsupervised machinelearning for the segmentation of Energy Dispersive Spectroscopy (EDS) from …
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Nanofocusing Refractive X-Ray Lenses
… of the production of nanofocusing refractive x-ray lenses. These optics made of either silicon or diamond are well-suited for high resolution x-ray microscopy. The goal of this work is the design of a reproducible manufacturing process which allows the production of silicon lenses with high …
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Nano-imaging to Determine the Interstitial Nature of Mn(II) Doping in 2D Halide Perovskites
… Torma By performing correlated nanoscale X-ray microscopy, temporally resolved photoluminescence measurements, and magnetic force microscopy on the inorganic 2D perovskite Cs2PbI2Cl2, we show that doping Mn2+ into the structure results in a lattice expansion. The observed lattice expansion …
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Study of microwave-assisted magnetization dynamics in magnetic films and structures
… been investigated in individual elements by X-ray microscopy techniques to temporally and spatially map the spin wave contribution to the reversal mechanism. The study showed that spin waves are the dominant driving mechanism of reversal in small elements. Finally, a novel electrical …
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Fabrication and Characterization of Three-Dimensional Magnetic Nanostructures
… the performance of synchrotron-based magnetic X-ray microscopy in 3D geometries and adapting existing magneto-optical techniques to rapidly probe 3D nanostructures in the lab. As a result of this work, new tools and skills are available in the field of 3D nano-magnetism, unlocking a path for the …
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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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Design and development of a 3D X-ray microscope
… response of an injection into real tissue. X-ray radiography, x-ray microscopy, and computerized tomography (CT) were identified as the most appropriate imaging techniques used for non-invasive imaging of opaque objects and an instrument was constructed, utilizing all of those techniques. The …
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Fabrication and Characterization of Three Dimensional Photonic Crystals Generated by Multibeam Interference Lithography
… process achieves excellent optical quality. X-ray microscopy provides non-destructive inspection of the fabricated crystals at nano-scale resolution. A reconstructed crystal model is generated by computed tomography which allows for comparison to a predicted structure's geometry and optical …
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Static and dynamic properties of magnetic Skyrmions in engineered multilayer films
… of the skyrmion nucleation process. By using X-ray microscopy, I performed the imaging of various magnetic textures in these multilayers and studied their current-induced generation and motion as a function of applied field and temperature. Finally, another goal of this work is to establish a …
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The productive reuse of coal, biomass and co-fired fly ash
… 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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Studying Electronic Textures with Coherent Lensless Imaging
X-ray microscopes have opened our collective eyes to the richness of nanoscale texture in systems such as correlated and quantum materials. These microscopes draw their power from the combination of short wavelengths, which provide high resolution, and interaction with atomic resonances, which …
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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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