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 108 for “"microcrystalline"”.
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Chlorhexidine Interaction with Microcrystalline Cellulose
… Liquid Chromatography (HPLC). By examining microcrystalline cellulose as a model, we will investigate the mechanisms of staining and toxicity. Identifying these reaction products will improve our understanding of chlorhexidine’s interactions with bleach and textiles, guiding safer use in …
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Adsorption of hydrogen chloride on microcrystalline silica
The National Aeronautics and Space Administration's Space Shuttle employs a solid rocket propellant. Combustion of the solid propellant produces hydrogen chloride as one of the major products. In this thesis, the hydrogen chloride/silica system was investigated. Silica was chosen as a model …
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Thermally stimulated currents and photoconductivity in microcrystalline silicon
This thesis focuses on the characterization of microcrystalline silicon ( c-Si:H) samples by numerically simulated and experimental thermally stimulated currents (TSC). TSC measurements and simulations demonstrate in detail two different retrapping regimes (strong and weak). A combined experiment - …
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Fabrication and characterization of microcrystalline silicon solar cells
In this study, single junction p-i-n uc-Si:H solar cells were prepared using plasma of silane diluted by hydrogen in a low-cost, single chamber, non-load-locked RF-PECVD system. Direct structural characterization of uc-Si:H solar cells, rather than stand-alone films, was conducted using Raman …
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The properties of amorphous and microcrystalline Ni - Nb alloys.
Thesis: Metal. E., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1978
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Modeling, design and fabrication of thin-film microcrystalline silicon solar cells
… design and fabrication of low-cost thin-film microcrystalline silicon(ucSi) solar cells is studied in this thesis. The cell, considered in this investigation, utilizes low-cost glass as the substrate and microcrystalline Si (uc-Si) as the active layer. A comprehensive refractive index (n) and …
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A real-time study of hydrogenated amorphous silicon, microcrystalline silicon, and amorphous silicon carbide growth by optically enhanced infrared reflectance spectroscopy
… of hydrogenated amorphous silicon (a-Si:H), microcrystalline silicon ($\mu$c-Si:H), and hydrogenated amorphous silicon carbide $\rm (a-Si\sb{1-x}C\sb{x}$:H) thin films by reactive magnetron sputtering. Complimentary information about the film microstructure is obtained from real time …
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Examining Molecular Interactions of Proteins by Isotopic Labeling, Sample Formulation and Solid-State NMR Spectroscopy
… and molecular interactions of membrane or microcrystalline protein formulations. In this work, we developed techniques to examine molecular interactions in microcrystalline proteins and have begun efforts to identify mechanistic details of large membrane proteins by SSNMR. We first …
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Synthesis, Consolidation, and Mechanical Testing of Nanophase Metals
… specimens showed a higher creep rate than their microcrystalline counterparts, exhibiting creep even at room temperature. The activation energies for both specimens are lower than activation energy for grain boundary diffusion in microcrystalline materials. A model is proposed to explain the …
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Phase transitions in superionic PbSnF₄
… milling results in a phase transition, giving microcrystalline disordered $\mu\gamma$-PbSnF$\sb4$, a cubic $\beta$-PbF$\sb2$ like phase. Tests were performed to make sure the $\mu\gamma$-PbSnF$\sb4$ samples are indeed microcrystalline cubic PbSnF$\sb4$ and not a mixture of microcrystalline …
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Effect of surface modifications on biodegradation of nanocellulose and microbial response
… were grown under anaerobic conditions with microcrystalline cellulose as the sole carbon substrate over a period of 246 days before being aliquoted to microcosms for subsequent biodegradation assays. Various forms of nanocellulose were spiked into the microcosms and compared with …
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Depositing highly crystalline thin film silicon for photovoltaic solar cells utilizing metal surface wave plasmas
… tandem junction morphologies, ranging from microcrystalline to amorphous silicon films. This validates MSWPs as a robust PECVD source to deposit thin films quickly, yet flexible enough to deposit both amorphous and microcrystalline silicon.
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Bio based photocurable polymers for advanced applications
… of purification, and a selective route producing microcrystalline cellulose with properties comparable to commercial grades. These materials served as the basis for subsequent material design strategies. Cellulose was employed as an active component in three different functional photocurable …
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Characterization of Sentinel Butte Petrified Wood and Host Lithology Associations
… phases involved in the petrification, include microcrystalline quartz (chert), fibrous chalcedony and megaquartz. Silica fills tracheids and also pervasively replaces organic material. Permineralization is the dominant mode of fossilization observed, with silica filling tracheids and other …
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Experimental diagenesis of lime mud
Textures similar to those found in natural microcrystalline limestones (micrites) were produced by closed-system (70-200$\sp\circ$C/1-15.6 bars/1-486 days) and open-system (90-95$\sp\circ$C/1 bar/63-311 days; 10-200 mL/day) hydrothermal experiments on a variety of lime muds ($<$25 $\mu$m size …
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Characterisation of thin-film semiconductors for device application
Microcrystalline silicon films prepared over a range of deposition conditions have been investigated using dark- and photo-conductivity measurements, constant photocurrent method and transient photoconductivity. The dark conductivity was measured as a function of temperature; the photoconductivity …
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