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.
Results
Showing 1 to 20 of 253 for “"Reaction mechanisms"”.
-
Surface Reaction Mechanisms in Plasma Etching Processes
Surface reactions occurring in fluorocarbon plasmas also influence plasma properties by consuming or generating plasma fluxes. Of particular interest is the effect that surfaces have on CF2 densities, as CF2 is a precursor for polymer formation. These processes were investigated with the integrated …
-
Surface Reaction Mechanisms for Plasma Processing of Semiconductors
… PS as ILDs. To investigate these issues, a reaction mechanism for plasma stripping of residual fluorocarbon polymer using oxygen-based chemistries has been developed and incorporated into the MCFPM. Stripping was less efficient from PS trenches having large pores and high interconnectivity, …
-
Real-time mass spectrometric analysis of catalytic reaction mechanisms
… in a fundamental study, the Suzuki-Miyaura (SM) reaction was investigated in detail. The first investigation revealed that published methods to degrade PFOS were ineffectual, with apparent decreases being associated with adsorption onto available surfaces. In the Suzuki-Miyaura reaction, a …
-
Combustion simulations in Diesel engines using reduced reaction mechanisms
… and which shows an increase at ignition. Its reaction rate was obtained from a detailed mechanism and combined with a presumed probability density function (pdf). The intrinsic low-dimensional manifold (ILDM) method was used as a chemistry model. It is an automatic reduction of a detailed …
-
Studies of Reaction Mechanisms Requiring Low Molecular Weight Thiol Cofactors
The methyl-transfer reaction between methylcobalamin and 2-mercapto-ethanesulfonic acid (Coenzyme M) was investigated. We propose that this reaction is a thiyl radical promoted homolytic cleavage of the cobalt-carbon bond rather than the nucleophilic attack by thiolate anion which has been pro
-
Reaction mechanisms of hydrothermal liquefaction of model compounds and biowaste feedstocks
… To further understand the fundamental mechanisms of HTL and to provide information for further developments of this technology, experiments with both model compounds and typical biomass (e.g. swine manure) as feedstock were conducted, the product distribution and the properties were …
-
Reaction mechanisms for catalytic partial oxidation systems : application to ethylene epoxidation
… in kinetic modeling, building elementary surface mechanisms have become vital to understand the complex chemistry for catalytic partial oxidation systems. Given that there is selected experimental knowledge on surface species and a large number of unknown thermochemical, rate parameters, the …
-
Dynamic mesh adaption for supersonic combustion waves modeled with detailed reaction mechanisms
… dimensions modeled with a detailed chemical reaction <br>mechanism. <br>To validate the whole numerical scheme, test cases with a single irreversible <br>reaction (reactive Euler equations) and hydrogen-oxygen combustion <br>(8 species plus diluent with detailed reaction mechanism) are …
-
Surface reaction mechanisms during the atomic layer deposition of silicon-based dielectrics
… primarily focused on understanding the surface reaction mechanisms during the ALD of Si-based dielectric films using in situ attenuated total reflection Fourier transform infrared spectroscopy. Initially, we looked at a baseline SiNx ALD process using alternating exposures of Si2Cl6 and NH3 …
-
Building robust chemical reaction mechanisms : next generation of automatic model construction software
Building proper reaction mechanisms is crucial to model the system dynamic properties for many industrial processes with complex chemical reaction phenomena. Because of the complexity of a reaction mechanism, computer-aided reaction mechanism generation software appeared in recent years to help …
-
Structure, morphology and reaction mechanisms of novel electrode materials for lithium-ion batteries
… the formation of a Cu1+ intermediate. Such side reaction prevents Cu from transforming back to CuF2, leading to negligible capacities in subsequent cycles and making this material challenging to use in a rechargeable battery.
-
Diagnosing Band-Mediated Electrochemical Half-Reaction Mechanisms and Identifying the Unique Features Thereof
… catalysts may proceed by electrochemical mechanisms. Furthermore, we aim to illustrate the distinctive characteristics of this reactivity paradigm in the hope that the unique features might be exploited in future redox catalyst design. In Chapter 2, we show that thermal oxidation of an …
-
Probing of reaction mechanisms, and development of polymeric materials for lithium-air batteries
… volatile and flammable liquid electrolytes, side reactions between the electrolyte/electrode with oxygen reduction products, and high charging over-potentials that lead to poor cycle life. We address these challenges by developing non-flammable polymeric-based electrolytes and electrodes, and …
-
CFD Simulation of Combustion Using Automatically Reduced Reaction Mechanisms : A Case for Diesel Engine
… from the ILDM chemistry. Low-temperature reactions lead to the slow formation of a radical pool after the fuel is injected in the engine. The concentration of this radical pool increases during the ignition-delay period due to chain reactions. After a critical mass of radicals is formed, …
-
Molecular-Level Understanding of Electrochemical Reaction Mechanisms and Electrode Interphases in Metal-CFx Batteries
… understanding of the electrochemical reaction mechanisms, how the materials are affected by radiation, and how the discharge products and electrode films and interfaces evolve with age. In addition, the origin of large overpotentials and possibility of rechargeability remain areas of …
-
Spectroscopic Studies and Reaction Mechanisms of Small Molecule Oxidation over Metal Oxide-Supported Catalysts
… Additionally, a fundamental understanding of reaction mechanisms that occur on novel material surfaces is required before improved materials can be developed. To this end, the oxidation of three simpler, smaller organic molecules were studied over a variety of materials in order to build up a …
-
Ultrahigh Vacuum Studies of the Kinetics and Reaction Mechanisms of Ozone with Surface-Bound Fullerenes
… Recent ultrahigh vacuum studies of the reaction of gasphase ozone with surface-bound fullerenes have made it possible to observe the formation and subsequent thermal decomposition of the primary ozonide (PO). As the use of nanomaterials, such as C₆₀, continues to increase, the exposure …
-
Elucidation of the reaction mechanisms involved in the catalysis mediated by glutamine synthetase in Escherichia coli
… form of the enzyme. Possible model mechanisms for the both the adenylylated and deadenylylated forms of the enzyme are proposed.
-
Ultrahigh Vacuum Studies of the Reaction Mechanisms of Ozone with Saturated and Unsaturated Self-Assembled Monolayers
… a more complete understanding of the interfacial reactions of ozone with vinyl-containing organic thin films, self-assembled monolayers that contain vinyl groups positioned precisely at the gas/surface interface were synthesized as model systems for atmospheric organic aerosols. To isolate the …
Page 1 of 13