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 25 for “"oxygen exchange"”.
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High-throughput characterization of surface oxygen exchange kinetics in combinatorial oxide thin films
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Mechanism of sarcoplasmic reticulum Ca-ATPase and multidrug resistance P-glycoprotein probed by Pi-HOH oxygen exchange
Bibliography: leaves 135-146.
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Benthic oxygen exchange across soft and hard bottoms using the new Eddy Correlation technique: Case studies from the tropics to the Arctic
… of organic material at the sediment surface in oxygenated sediments, and equally the release of O2 represents benthic primary production. Many important biological processes are regulated by the availability of O2 at the seabed including: fauna composition and activity, phosphate exchange, …
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Relating multiscale structure and chemistry with oxygen exchange kinetics in low-thermal-budget Sr(Ti,Fe)O3-d and high-throughput combinatorial thin films
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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I. An oxygen-17 NMR study on oxygen exchange in yttrium barium(2) copper(3) oxygen(7-x). II. Synthesis of transition metal polysulfide complexes from metal powders
Covellite, $\rm Cu\sp{I}\sb2(S\sb2)Cu\sp{II}S$ (T$\sb{\rm c}$ = 1.66 K) and $\rm YBa\sb2Cu\sp{II}\sb2Cu\sp{III}O\sb{7-x}\ (T\sb{c}$ = 92 K) are similar in that both are superconductors containing layered structures and mixed valent copper centers. Our studies on YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ …
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Mass spectrometric characterization of remotely charged amino acids and peptides
… In particular, phenoxide formation by nitrogen–oxygen exchange is observed with both isomers. Oxygen atom abstraction by NO is also observed with both isomers. Very significant differences in the reactivity are observed in the reactions of the two isomers with carbon disulfide. The reactivity of …
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Electrochemomechanics in Mixed Ionic Electronic Conductors and solid oxide cells
… characteristics in solid oxide cells with oxygen surface exchange and results are compared with experimental cell operation. The model is used to study the effect of oxygen surface exchange and the bulk diffusion of defects on the performance of solid oxide cell. In the fourth chapter, the …
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Integrated Microfluidic Culture Media Oxygenator for Organ-on-a-Chip Applications
… the in vivo physiological microenvironment. Oxygen is a key element for maintaining cell viability and function in MPS devices. Thus, this thesis presents the design, fabrication, and testing of a microfluidic oxygenator chip, or "Oxychip", for providing control of oxygen concentration in MPS …
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Development of an integrated microfluidic platform for oxygen sensing and delivery
… technology was developed capable of generating oxygen directly from water present in blood plasma. This technology is intended to provide a self-contained, mobile oxygen supply suitable for implantation or extracorporeal oxygenation in support of an acute or chronically disabled lung. The core …
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Optical Imaging Of Tissue Physiology With Exogenous Contrast Agents
… and bothintravascular- and extravascular-tissue oxygen concentration in a rat brain during functional activation; the new instrumentation needed to collect this information used contrast agent phosphorescence lifetime to determine oxygen concentration and speckle contrast imaging to probe blood …
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Uncovering Biological Mechanisms of Immunomodulatory Biomaterials for Encapsulated Cell Therapies
… immune attack while allowing for nutrient and oxygen exchange. While this approach holds greats potential, the immune response to biomaterials remains a major challenge to the field. Upon implantation of a material, the immune system will initiate the foreign body response, a cascade of …
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Thermodynamic stability of perovskite and lanthanum nickelate-type cathode materials for solid oxide fuel cells
… the polarization resistance associated with the oxygen reduction reaction(ORR) at the cathodes. Hence, improving the cathode design will greatly enhance the overall performance of SOFCs. Lanthanum nickelate, La2NiO4+δ (LNO), is a mixed ionic and electronic conductor that has competitive surface …
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Fundamental studies of heterostructured oxide thin film electrocatalysts for oxygen reduction at high temperatures
… for active and cost-effective catalysts for oxygen electrocatalysis is essential for the development of efficient clean electrochemical energy technologies. Perovskite oxides are active for surface oxygen exchange at evaluated temperatures and they are used commonly in solid oxide fuel cells …
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Fundamental studies of perovskite related oxide thin films for oxygen electrocatalysis at intermediate temperatures
… currently utilized for applications including oxygen permeation membranes and solid oxide fuel cells (SOFCs), but alternative materials with higher catalytic activity and stability are required for intermediate temperature (500 - 700 °C) oxide electrocatalysts. In this thesis, two promising …
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The effect of Niobium on the defect chemistry and corrosion kinetics of tetragonal ZrO₂ : a density functional theory study
… by a ~5 times decrease in the doubly charged oxygen vacancy concentration was found due to the presence of Niobium in the high oxygen partial pressure (p02) regime corresponding to oxide/water interface. This change implies slowing down of oxygen diffusion from surface to bulk, while …
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External field effects on electronic and ionic defects in functional oxides: Experiments and simulations
… the nonlinear dielectric response of neutral oxygen vacancies, composed of strongly localized electrons at an oxygen vacancy site, in perovskite oxides of the form ABO₃. Our approach implements a computationally-efficient local Hubbard U correction in density functional theory simulations. …
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$^{17}$O Solid-State NMR Spectroscopy of Functional Oxides for Energy Conversion
… details of oxide-ion motion and sublattice exchange in a novel family of promising SOFC electrolyte materials based on $\delta$-Bi$_{2}$O$_{3}$. In the first section, $^{17}$O magic-angle spinning (MAS) NMR spectra of the paramagnetic MIEC, La$_{2}$NiO$_{4+\delta}$, are presented and …
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Designing Electrocatalysts for the Production and Oxidation of Liquid Fuels
… into value-added chemicals or fuels is the oxygen evolution reaction (OER), which is found in nearly every process. The plentiful nature of OER’s main reactant, water, and moderate thermodynamic potential of 1.23 V vs. the reversible hydrogen electrode, make OER an ideal reaction to pair …
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Characterization and control of non-stoichiometry in Pr₀.₁Ce₀.₉O₂-[d̳e̳l̳t̳a̳] thin films : correlation with SOFC electrode performance
… oxide thin films often depend strongly on oxygen nonstoichiometry (6), there have been few means available for its measurement and control in a reliable and in-situ fashion. In this work, we investigate means for extracting the oxygen nonstoichiometry of dense oxide thin films as a function …
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