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 24 for “"Diffusion kinetics"”.
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Surface Diffusion Kinetics on Amorphous Silicon
In addition, the parameters for self-diffusion on amorphous silicon at processing temperatures (above 635°C) are determined by analyzing our own series of HSG growth experiments using chemical vapor deposition. The results of this study are compared to HSG growth data obtained from MBE growth …
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Diffusion kinetics and phase separation phenomena during asymmetric membrane formation
In this thesis, both mathematical modeling and experimental analysis of the dynamics of the phase inversion process for forming asymmetric membrane structure have been carried out. A comprehensive model combining the evaporation and quench steps of phase inversion has been developed by using an …
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Study of gold diffusion kinetics in p/p+ epitaxial silicon
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1998.
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Argon and Neon Diffusion in Lunar Impact Glass & The Development of the Electron Microprobe Zircon Fission-Track Dating Technique
… experiments and modeling to determine the diffusion kinetics of Ar and Ne in lunar impact glass.</p>
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Characterization of photocurable networks in real-time and post-exposure
… to shift the crosslinking rate from reaction kinetics controlled to diffusion kinetics controlled. The effect of exposure intensity and exposure time on chemical conversion was ascertained via Fourier transform infrared microspectroscopy mapping experiments. The relationship between exposure …
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Characterization of heat-treated nickel and gold films on silicon single crystals
… were identified as NiSi<sub>2</sub>.</p> <p>Diffusion appeared to be important to the formation of the NiSi<sub>2</sub>. Therefore, in-depth Auger electron spectroscopy was used to study the diffusion kinetics of nickel in silicon. The activation energy for diffusion of nickel in silicon was …
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Hydrogen storage in zeolites: activation of the pore space through incorporation of guest materials
… of bulk lithium borohydride, but with slower kinetics, implying diffusion effects of occlusion into the host. Adsorption showed reduced uptakes of hydrogen at 77 K compared with the host zeolite, which was consistent with the degree of loading. Limited hydrogenation was achieved with milder …
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DESIGN AND SYNTHESIS OF STAINLESS-STEEL NANOPARTICLES: OXIDATION BEHAVIOR AND MORPHOLOGICAL EVOLUTION
… shell thickness and shell-deposition routes, and diffusion data for Fe/Cr, Fe/Ni, and Fe/CrNi core/shell NP systems is provided. In chapter 3, I describe the synthesis of cube-shaped FexCr1-x alloy NPs, oxidation and the subsequent formation of internal voids. HRTEM images of oxidized alloy NPs …
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Modellierung und Validierung zeitabhängiger mikrochemischer Prozesse in Aluminium Knetlegierungen
… quenched in a solid solution, due to their slow diffusion kinetics. Therefore the as-cast condition is far from thermodynamic equilibrium. One of the main goals of the industrial process of pre-heating is to precipitate Mn and Fe and to eliminate microsegregations.During heating of the as-cast …
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Defect equilibria and electrode kinetics in Prx̳Ce1̳-̳x̳O2̳-̳[̳d̳e̳l̳t̳a̳]̳ mixed conducting thin films : an in-situ optical and electrochemical investigation
… of oxygen defect equilibria and transport kinetics in oxides is essential for achieving enhanced performance and longevity in many oxide-based practical applications. The ability to diagnose a material's behavior in a thin film structure under operating conditions (in operando), ideally in …
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Investigation into reliability and performance of an implantable closed-loop insulin delivery device
… designs. To study insulin delivery mechanism and kinetics from the device, fluorescently labelled human insulin (FITC-insulin) was synthesised and characterised using RP-HPLC and MS, to produce a product with predominantly di-labelled conjugate (>75%) with no unreacted FITC or native insulin. …
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Cryopreservation of pancreatic islets
… and need for long incubation. Investigation of diffusion kinetics demonstrated that a minimal incubation time of 6 h at 37 °C is required to enable diffusion of solutes into the islet core. This finding implies that current clinical viability assessment protocols only survey the periphery of …
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Development of adsorption-based atmospheric water harvesting and thermal energy storage technologies
… important aspects (e.g., inter/intracrystalline diffusion kinetics). This thesis provides a generalized framework to select the materials, design, and develop sorption-based energy and water systems. First, this thesis presents the design and demonstration of a device based on porous MOF-801 [Zr …
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Insights on the synthesis, properties, and performance of high-nickel layered oxide cathodes
… limiting single-crystal performance is poor diffusion kinetics. However, the elimination of intergranular boundaries elicits surprising phase transition behavior; despite sluggish diffusion, nucleation-controlled transformations are maintained to much higher current draws due to the larger …
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Zircon (U-Th)/He Dates from Radiation Damaged Crystals: A New Damage-He Diffusivity Model for the Zircon (U-Th)/He Thermochronometer
… chemical compositions with a single set of ⁴He diffusion kinetics derived from only a handful of crystals (Reiners et al., 2004). However, it has become increasingly clear that a "one-size-fits-all" approach to these kinetics is inadequate, leading to erroneous conclusions and incongruent data. …
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Fundamental Studies of the Uptake and Diffusion of Sulfur Mustard Simulants within Zirconium-based Metal-Organic Frameworks
… capabilities, the adsorption mechanism, diffusion energetics, and diffusion kinetics of HD simulants were determined. For 2-chloroethyl ethyl sulfide (2-CEES), a widely used HD simulant, infrared spectroscopy revealed that adsorption within Zr-MOFs primarily proceeded through hydrogen …
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A Computational Study on the Structure, Dynamics and Mechanoelectric Transduction of Vestibular Hair cell
… I have extended this approach by adding channel kinetics and structural dynamics to the FE structural model of the hair cell. I have expanded the previous static and passive model to a dynamic and active model. It is the most detailed hair cell structural model and includes up-to-date knowledge …
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Gating of water channels (aquaporins) in plants: effects of osmotic and oxidative stresses and the role of unstirred layers
… estimated from ratios between osmotic ( ) and diffusional (Pd) water flow as derived from measurements of hydraulic and isotopic water flows, which represent the number of water molecules (N) in a single-file pore transporting water. Values of N ranged between 35 and 60, which referred to …
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Control of glucose and xylose utilization by Clostridium thermohydrosulfuricum Rt8.B1
… (high Vₘₐₓ) system for xylose uptake and the kinetics were indicative of facilitated diffusion. The xylose isomerase of Cl. thermohydrosulfuricum Rt8.B1 had a high Kₘ for xylose (low-affinity) and xylulokinase had a low Kₘ for xylose (high-affinity). The Kₘ for xylulokinase was lower than the …
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Cross-Laminated Timber made of Unmodified and Thermally Modified Yellow-Poplar Lumber
… layer; (2) predicting long-term moisture diffusion performance using hygrothermal simulations; (3) establishing correlations between moisture-induced strain and water vapor diffusion to provide input for physics-informed modeling; and (4) developing a predictive model for water vapor …
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