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 15 of 15 for “"hydroperoxy"”.
-
Effects of Water Vapor on the Kinetics of the Methylperoxy Radical Self-reaction and Reaction with Hydroperoxy
The gas phase reactions of CH3O2 + CH3O2, HO2 + HO2, and CH3O2 + HO2 in the presence of water vapor have been studied at temperatures between 263 and 303 K using laser flash photolysis coupled with UV time-resolved absorption detection at 220 nm and 260 nm. Water vapor concentration was quantified …
-
Modeling of an upper Midwest forest boundary layer and vehicle indoor air quality
… chemistry begins with the hydroxyl and hydroperoxy radicals. Recent research suggests that there is still considerable uncertainty in our understanding of the sources of these radicals and their role as sinks. The work detailed in this thesis describes a computational approach to …
-
A study of the thermal decomposition of allyl t-butyl peroxide and 3-hydroperoxy-1-propene (allyl hydroperoxide) in toluene /|nby Krishnankutty Nair V. G. -- 260 St. Catharines [Ont. : s. n.],
… decompositions of allyl-t-butyl peroxide and 3-hydroperoxy- l-propene (allyl hydroperoxide ) in tolune were investigated. Decompositions of allyl-t-butyl peroxide in toluene at 130-1600 followed first order kinetics with an activation energy of 32.8 K.cals/mol and a log A factor of 13.65. The …
-
Mechanisms and Intermediates of Iron Bleomycin Catalyzed Oxidations
… The ability of ferric bleomycin to use hydroperoxy compounds and mediate the oxidation of small organic substrates in vitro has been utilized in the design of mechanistic studies which probe the chemical mechanisms and reactive intermediates involved in iron bleomycin catalyzed …
-
Evaluating the Utility of an Atmospheric Pressure Chemical Ionization Mass Spectrometer for Detecting Organic Peroxides During Beta-Pinene Ozonolysis Experiments
… to protonated organic peroxides containing a hydroperoxy moiety. Given this observation, the NLS analysis mode was used to selectively detect organic peroxides formed during β-pinene ozonolysis experiments. Overall, six organic peroxide structures were proposed. Further product-ion scan …
-
Study of elementary reactions of combustion importance at elevated temperatures and pressures
… of O(^1D) and hydroxyl with H_2O_2 produce hydroperoxy radicals. Temporal profiles of CH_3 and HO_2 are recorded via absorption at 216.4 and 224 nm, using xenon arc lamp and a spectrograph, OH radicals are monitored via transient absorption of light from a dc discharge H_2O/Ar low pressure …
-
Synthesis, Characterization, And Properties Of Peroxo-Based Oxygen-Rich Compounds For Potential Use As Greener High Energy Density Materials
… velocity (7130 m/s) was obtained for 1,4-bis(dihydroperoxymethyl)benzene, which has the highest crystalline density (1.648 g/cm3). This detonation velocity is greater than the secondary explosive 2,4,6-trinitrotoluene (TNT). The sensitivities of these oxygen-rich geminal hydroperoxides are lower …
-
Detailed Kinetic Modelling of the Oxidation and Combustion of Large Hydrocarbons Using an Automatic Generation of Mechanisms
… rules to the code, such as ketone reactions, hydroperoxy cyclic-ether formations and additional reactions of alkenes, (3) inclusion of small oxygenates, produced by the code but not included in the handwritten C1-C4 sub-mechanism yet, to the handwritten C1-C4 sub-mechanism. In order to …
-
Methyl esterification of fatty acids and eicosanoids with a novel reagent trimethylsilyldiazomethane for analysis by gas chromatography-mass spectrometry
… (LOX) enzymes convert arachidonic acid into hydroperoxy derivatives of PUFAs termed leukotrienes, which play a role in asthma and allergies. The reagent trimethyl silyl diazomethane (TMSD) which is less toxic and explosive than other reagents such as diazomethane, has been developed for use …
-
MEASUREMENTS AND MODEL PREDICTIONS OF HYDROXYL RADICAL, PEROXY RADICALS, AND NITROUS ACID: EVIDENCE OF MISSING SOURCES OR SINKS IN FORESTED AND INDOOR ENVIRONMENTS
… by OH propagates a radical cycle between OH, the hydroperoxy radical (HO2), and organic peroxy radical (RO2). Due to its importance in the atmosphere, there is a substantial body of literature investigating ROX (≡ OH + HO2 + RO2) chemistry in the outdoor environment, but few measurements occurring …
-
Thermochemistry and kinetics in pyrolysis and oxidation reaction of oxygenate chlorocarbons, neopentane, and ortho-xylene
… alkoxy, hydroxy alkyl radicals, peroxy and hydroperoxy alkyl radicals are determined by ab initlo and density functional calculations for modeling and optimization of complex chemical processes for combustion or incineration of chlorinated hydrocarbons. The entropy and heat capacities from …
-
MEASUREMENTS OF ATMOSPHERIC RADICALS IN AMBIENT AND INDOOR ENVIRONMENTS: OUTDOOR-INDOOR RELATIONSHIPS, INDOOR FORMATION MECHANISMS, AND INSTRUMENTAL ANALYSIS
Hydroxyl (OH), hydroperoxy (HO2), and peroxy (RO2) radicals are key to atmospheric oxidation, critically altering the chemistry of the air we breathe. Radical reactions initiate oxidation of volatile organic compounds (VOCs), which in the presence of nitrogen oxides (NOx) can form ozone and …
-
The reaction pathways of hydrogen peroxide in the presence of scavengers and its transition metal catalyzed oxidation of disulfide bridge containing peptides
… breakdown of a proposed intermediate, 2-hydroxy-hydroperoxy-propanoate. Samples of 13C-enriched sodium pyruvate were used to verify the formation of the intermediate and identify its structure by the heteronuclear multiband correlation spectroscopy NMR method. The observed chemical shifts have …
-
Modeling polymerization-based amplification
… oxygen. This reaction results in an unreactive hydroperoxy species and the regeneration of ground state eosin which can then produce even more radicals that undergo propagation. The simulation results indicated that the additional eosin regeneration reaction did explain eosin's ability to …
-
A single-crystal EPR study of radiation-induced defects in selected silicates
… at room temperature for three months reveal a hydroperoxy radical HO2 with complex proton hyperfine and superhyperfine structures. The single-crystal EPR spectra of this HO2 radical, measured from 4 K to 275 K, confirm two reversible phase transitions at ~98 K and ~21 K. Spin-Hamiltonian …