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 3390 for “"Electron microscopy"”.
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Mathematical Challenges in Electron Microscopy
Development of electron microscopes first started nearly 100 years ago and they are now a mature imaging modality with many applications and vast potential for the future. The principal feature of electron microscopes is their resolution; they can be up to 1000 times more powerful than a visible …
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Dynamic environmental transmission electron microscopy
… of a dynamic environmental transmission electron microscope (DETEM) at the University of Illinois Urbana Champaign is documented in this thesis. The proposed apparatus is the first of its kind, combining the power of high-resolution electron imaging and diffraction of TEM, the time …
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Quantitative high resolution transmission electron microscopy
High resolution transmission electron microscopy (HRTEM) has been extensively used as a structure characterization technique in materials and biological science. In the past, qualitative use of HRTEM has been primarily employed.
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Drift correction for scanning-electron microscopy
Scanning electron micrographs at high magnification (100,000x and up) are distorted by motion of the sample during image acquisition, a phenomenon called drift. We propose a method for correcting drift distortion in images obtained on scanning electron and other scanned-beam microscopes by …
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Quantitative electron microscopy of supported subnanometer clusters
… depends upon their size, which determines their electronic structure. Therefore, it is vital to reliably understand particle size distribution, and variation, which occurs due to fragmentation and sintering. In this research, I present a refined electron microscopy approach to study particle size …
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Multi-dimensional Data Analysis in Electron Microscopy
… applied across a range of scanning transmission electron microscope (STEM) experiments. As a result, the Stark effect in quantum disks was mapped in a cathodoluminescence STEM experiment, and fully quantifiable 3D atomic distributions of a complex boron nitride core-shell nanoparticle were …
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Next generation tools for smart electron microscopy
Smart Electron Microscopy (SmartEM) is a new generation EM imaging technology that promises to revolutionize microscopy. In this research, we explore the integration of advanced techniques to enhance this technology further. These include alternative characterization of high-resolution rescanning, …
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Transmission Electron Microscopy Studies In Shape Memory Alloys
… microstructural observations from transmission electron microscopy (TEM). Specifically, the goals were to examine (i) the effect of mechanical cycling and plastic deformation in superelastic NiTi; (ii) the effect of thermal cycling during loading in shape memory NiTi; (iii) the distribution of …
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Transmission Electron Microscopy Study of Domains in Ferroelectrics
… polarisation in that region. The chemical and electronic heterogeneity of the ceramic was linked to the changes in potential barrier at the grain boundary, theorised by the Heywang-Jonker model. It was inferred that the confined PbTiO<sub>3</sub> rich grain boundary region would have a higher …
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Affinity cryo-electron microscopy: Methods development and applications
<p>Single particle cryo-electron microscopy (cryo-EM) is an emerging powerful tool for structural studies of macromolecular assemblies. Although less concentrated and smaller amounts of samples are required for single particle cryo-EM compared to X-ray crystallography, it remains challenging to …
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Direct ray tracing for low energy electron microscopy
… is concerned with the accurate simulation of electron trajectory paths in electron optics. In particular, it investigates the use of a direct ray tracing method that employs the Cash-Karp 5th order Runge-Kutta technique in combination with a Fourier series fit to axial magnetic/electric field …
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Structural characterisation of V-ATPases by electron microscopy
… of V-ATPase complexes was explored through electron microscopy of single particles and their subsequent digital image processing. Three-dimensional (3D) maps were calculated of the plant V-ATPase – both in the presence and the absence of a non-hydrolysable ATP analogue (AMP-PNP) – and the …
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Cryo-electron microscopy studies of pluripotency factor Nanog
… of Nanog drives self-renewal, cryo-electron microscopy and single particle analysis were utilised to determine a 3D structure of Nanog. By performing size exclusion chromatography and analytical ultracentrifugation, it was discovered that Nanog forms large oligomers of 860 kDa which …
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Electron Microscopy Studies of Hybrid Perovskite Solar Cells
… up the cell. STEM-EDX (Scanning Transmission Electron Microscopy - Energy Dispersive X-ray spectroscopy) was employed to resolve at the nanoscale the morphology and the elemental composition of the devices. Firstly, a powerful procedure, involving FIB (Focus Ion Beam) sample preparation, the …
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Low-dimensional carbon allotropes: an electron microscopy investigation
… was performed using a wide range of transmission electron microscopy (TEM) techniques, from conventional imaging and diffraction, to advanced interferometric methods, like electron holography and Geometric Phase Analysis (GPA), using a low-voltage optical set-up, to reduce radiation damage in the …
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