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 “"dark-field"”.
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Quantitative High-angle Annular Dark Field Scanning Transmission To Electron Microscopy For Materials Science
… and defect structures. High-angle annular dark field (HAADF) STEM imaging using atomic number (Z) contrast has proven capable of resolving atomic structures with better than 2 A lateral resolution. In this work, the HAADF STEM imaging mode is used in combination with multislice simulations. …
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A machine vision-based in situ probe for automated on-line measurement of cell density and viability by dark field microscopy, image processing and pattern recognition
… the system complexity, a special probe based on dark field microscopy has been proposed in this work. A reflective condenser has been designed and built to achieve dark field illumination and high contrast images. The imaging system of the probe is also designed and configured in accordance with …
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Deformation and Transformation Mechanisms of Polybutene and Poly(vinylidene Fluoride)
… form. Potassium permanganate etching and dark field microscopy of fresh thick and thin films reveal that the lateral crystal size of the tetragonal form crystals in the fresh film is significantly reduced upon transformation to the hexagonal crystals during aging. Dark field microscopy and …
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The Structure and Composition of Metal Surfaces
… Monolayer thickness changes have been imaged in dark field on (111) Au films and a comparison of calculated and experimental values for bright field intensity changes identifies hillocks or depressions in the surfaces. Severe limitations are imposed on the imaging of surface steps by diffraction …
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Interferometric light microscopy for wafer defect inspection and three-dimensional object reconstruction
… both the phase and amplitude of the scattered field from the wafer. To detect deep sub-wavelength defects, we further reduced the noise in the images by developing an image post-processing method, called 2DISC (2nd-order image difference, image stitching, and convolution). With the 2DISC …
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Disorder and nanopatterning in ordered binary alloys: in situ ion irradiation and kinetic Monte Carlo simulation
… through in situ electron diffraction and dark-field transmission electron microscopy. Under irradiation with 500 keV Ne+ ions, our diffraction analysis reveals a similar, but steeper, trend in disordering rate as previously reported by resistivity. Further investigations by superlattice, …
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Phase Transformations in Lanthanide Calcium Manganese Oxide: Charge Ordering and Phase Competition
… in-situ electron diffraction and high resolution dark field images were carried out to investigate the phase competitions between CO and other phases during the phase transformations. Different scenario of phase transformations were found in differently doped La1-x CaxMnO3. Correlations between …
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Investigation of the hardening behaviour and ordering transformation in Pt 14 at. % Cu
… than for the initially quenched specimens. Dark field images of initially cold worked specimens after heat treatment showed smaller ordered regions than the initially quenched specimens. This suggests that smaller, more numerous ordered regions impede dislocations to a greater degree than …
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Evolution Of Lamellar Structures In Al-ag Alloys
… the medium-magnification high-angle annular dark-field contrast in scanning transmission electron microscopy. This calibration allows for the quantitative measurement of plate thicknesses from high-angle annular dark-field scanning transmission electron micrographs of Ag2Al plates inclined to …
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Mirror-Coupled Nanoantennas with Hexagonal-Boron Nitride Spacers
… confined by the nanoparticle. Comparing dark-field scattering with reflection spectroscopies shows plasmonic and Fabry-Perot-like enhancements magnify subtle interference contributions, which lead to unexpected redshifts in the dark-field spectra, explained by the presence of these new …
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Strain at surface and interface steps
… comparison of experimental and simulated dark field images. Employing this technique has allowed for the measurement of strain at surface and interface steps for the first time. It will be shown that a Si(111) 7 x 7 surface step possesses appreciable long range strain. This strain …
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Imaging the dynamics of soft materials at microscale and nanoscale
… In this thesis, imaging tools such as bright-field and dark-field optical microscopes and liquid-phase transmission electron microscope, have been utilized to capture the dynamics of three distinct yet typical soft materials in situ at different length scales: colloids, polymeric chains, and …
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Interferometric-spatial-phase imaging for sub-nanometer three-dimensional positioning
… viewed with specialized oblique-incidence, dark-field optical microscopes. Alignment detectivity is <0.5 nm, and detection range is >500 gm. Unlike amplitude-based interferometers, this spatial-phase-encoding interferometer achieves high alignment detectivity without sensitivity to …
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Probing light-matter interactions with differential polarizations: From chiral nanostructures to molecular sensing
… thesis utilizes plasmonic nanostructures and dark-field scattering to elucidate how differentially polarized light distinguishes between left- and right-handed chiral architectures, and how this discrimination can be utilized for molecular sensing. Leveraging the polarization sensitivity and …
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Crack Healing in Polymers (Fracture, Reptation, Tack)
… was described phenomenologically, from dark-field optical microscopy and light transmission measurements. For the healing of bulk polymer surfaces, molecular-level models were coupled with experiments to investigate the effects of healing time t, temperature T, and molecular weight M. …
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Discovering novel platinum structures
… (Tc). Electron diffraction patterns and dark field images were obtained from transmission electron microscopy to characterize the Pt[8]Zr phase. Microhardness measurements and light microscopy were used to investigate the Pt[8]Zr ordered phase and its effects on hardness and …
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Lyme disease in Indiana : isolation of Borrelia burgdorferi-like organisms from Dermacentor variabilis
… burgdorferi, of Lyme disease (LD), using dark-field and immunofluorescence microscopy, and tissue samples cultured in BSK II medium for 7 to 21 days. Spirochetes were isolated in the BSK II medium from pools of midgut diverticula from 6 D. variabilis from Martin County and pools of midgut …
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Studying DNA-Directed Nanoassembly, Hybridization and Mismatch-Discrimination via Plasmon Scattering of Gold Nanoparticles
… plasmon resonance (LSPR) coupling of nAu via dark field microscopy. The particular role of bulky nAu was exploited for distinguishing target DNA having single-base mismatches. Here, a head-to-tail nAu-DNA alignment was found to confer the head- and tail-probe with distinctly different …
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Untangling energy dependent radiation damping and chemical interface damping in gold nanorods
… To address this, we employed single-particle dark field scattering to systematically study the plasmon linewidth of gold nanorods. By coating gold nanorods with an insulating material, we can isolate radiation damping contributions and fully account for energy-dependent radiation damping with …
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