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 19 of 19 for “"Conversion Reaction"”.
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Structural evolution of α-Fe2O3 nanowires during lithiation/delithiation and electrochemical property improvement
… abundance, low cost and biocompatibility. Its reaction with lithium ion is accepted as conversion reaction. In this paper, single crystal α-Fe2O3 nanowires were prepared by an electrical resistive heating method under ambient conditions. Transmission electron microscopy characterized the anode …
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Investigation of non-intercalation electrode materials for next-generation batteries
… with high energy density increase dramatically. Conversion and alloying electrodes for secondary rechargeable batteries have been studied intensively as alternatives to intercalation materials as they can provide 2 to 5 times larger gravimetric capacities. However, there are many challenges …
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Design and Synthesis of New Systems for Photoprotection and Solar Energy Storage
… This work mainly focuses on the catalyzed back-conversion reaction and heat release measurements, obtaining a record system and the computational exploration of the ruling mechanisms.
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Purification of the proteins that bind to the gp-2 promoter in Dictyostelium discoideum
… effect of pH and phosphatase inhibitors on a "conversion" between the 0.32 and 0.40 Rf bands was examined. The results suggest that phosphorylation may be involved in the "conversion" reaction. This study suggests that the purified protein may be a trans-acting factor that is involved in …
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Microwave plasma synthesis of nano-sized silicon carbide at atmospheric pressure
… Hydrogen served as an added reductant for the conversion reaction, and argon served as the MTS carrier gas. The parameters studied were the H2:MTS molar ratio and the total enthalpy, in the ranges 0 to 10 and 70 to 220 MJ/kg respectively. X-ray diffraction studies confirmed the presence of …
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Nuclear magnetic resonance studies of simple molecules on metal surfaces
We have used NMR to study the structure and reactions of acetylene and ethylene adsorbed on small catalyst particles. By monitoring $\sp{13}$C-$\sp{13}$C and $\sp{13}$C-$\sp1$H dipolar couplings we found the carbon-carbon bond length to be 1.44 $\pm$ 0.02A for acetylene adsorbed on Rh clusters at …
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Hybrid nanostructure designs facilitated by M13 virus for lithium ion battery and lithium air battery electrodes
… investigated. First, the power performance of conversion reaction cathode materials, bismuth oxyfluorides, was improved. By rationally designing genetic sequences of the M13 virus, graphene sheets were homogeneously distributed throughout bismuth oxyfluorides cathodes as conducting paths. …
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Design and Modular Optimization of Components in Molecular Solar Thermal (MOST) Systems
… couple, focusing on the optimization of the back-conversion reaction through heterogeneous catalysis and the improvement of the system's sustainability. In the first stage of the research, a lack of standardized methods for evaluating the efficiency of heat release processes was identified. To …
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Autonome Parvoviren
… accepted that viral gene transcription needs the conversion of single-stranded Summary 134 DNA into double-stranded monomeric replicative form. Most probably this conversion reaction is disordered in A9 cells for the H1 genome. A defective double-stranded conversion might be due to an interaction …
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Thin Film Energy Devices
… materials that store Li through reversible conversion reactions, RuO2 was found to have a relatively large voltage hysteresis, which limits its cycling energy efficiency. Investigation of the mechanism of this reaction provided insights for further optimization of RuO2 for TF-LIBs. The …
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Electrochemical and spectroscopic insights into the electroreduction of carbon dioxide to value added chemicals
… the electrocatalytic mechanisms for the CO2 conversion reaction through spectrochemical studies. Chapter 2 reports several high surface area Cu-based catalysts, prepared by the electro-deposition of Cu, Cu/Ag, and Cu/Sn alloy films with the addition of 3,5-diamino-1,2,4-triazole (DAT) as an …
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Part I: Synthesis and Ring Opening Polymerization of Macrocyclic Monomers for Production of Engineering Thermoplastics
… to the high viscosity created in the first stage reaction. The latter stage leads to incomplete polymerization at the low initiator concentrations (1-3 mol%). At high initiator concentrations (5-7 mol%), 100% conversion is reached due to improved initiator distribution in macrocycles; however, …
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Thermal conductivity switching of polymers and lithium-ion battery electrode materials in response to external stimuli
… materials were studied during electrochemical reaction with Li+ ions. Five electrode materials with three electrochemical phase transition mechanisms with Li+ ions were chosen: Fe2O3 and NiO as conversion reaction systems, V2O5 and TiO2 as intercalation systems and Sb as an alloying reaction …
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Design and characterization of aromatic thermosetting copolyester resin for polymer matrix nanocomposites
… oligomers during condensation polymerization reaction regulate thermal-mechanical properties of self-generated foam morphologies. Aluminum foam layered aromatic thermosetting copolyester foam sandwich structures demonstrate outstanding impact energy absorption characteristics. High-performance …
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Computer Simulation and Optimization of the NOx Abatement System at the Radford Facility and Army Ammunition Plant
… series by a selective catalytic reduction (SCR) reaction vessel in their NOx abatement system. We use as the method of study computer simulations within ASPEN Plus, a process simulation software package for chemical plants. We develop three different models with which to characterize NOx …
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Synthesis of Novel CYP1 Activated Heterocyclic Anticancer Prodrugs
… activity, but are labile to photoisomerisation reactions converting the potent trans isomer to the less toxic cis isomer. Several heterocyclic ring systems were incorporated across the α,β-unsaturated moiety of the chalcones to produce rigid structures, eliminating the possibility of …
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Interrogating electrocatalytic mechanisms and developing nano-porous catalysts for energy conversion reactions: I. Oxygen evolution reaction, and II. Carbon dioxide reduction reaction
… and develop new nano-porous catalysts for energy conversion reactions including the oxygen evolution reaction (OER) and carbon dioxide reduction reaction (CRR). First, I examined the oxygen evolution reaction in basic electrolytes using in situ electrochemical surface stress measurements. Second, …
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Surface studies of Li-ion and Mg battery electrodes
… Lithiation of Thin Film and Multilayer Conversion Li-ion Battery Anodes: Oxide conversion reactions are an alternative approach for high capacity Li-ion batteries, but are known to suffer from structural irreversibility associated with the phase separation and reconstitution of reduced …
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Synthesis and characterization of nanostructured materials for Li-ion secondary batteries
… account, each of them presenting a different reaction mechanisms towards lithium. To overcome the specific problems related to each material different synthesis approaches were considered and structural-morphological aspects were modified to optimise the final electrochemical performance. The …