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 10 of 10 for “"organic radical"”.
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Studies of Radiation Effects in Three High Polymers
… resonance (EPR) was used to determine the total organic radical densities in the materials 0.5 hr after irradiation. Total organic radical densities of approximately 10<sup>18</sup>spins/g were recorded in all three materials. Additional postirradiation EPR radical density measurements were made …
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Developing novel polymer architectures for applications In magnetic resonance imaging and self-assembly
… approach is first utilized in the development of organic radical contrast agents (ORCAs) for magnetic resonance imaging (MRI). These ORCAs are composed of macromonomers bearing long polyethylene glycol chains and sterically hindered bis(spirocyclohexyl) nitroxide free radicals. This approach …
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Structural studies of radical enzymes in bacterial central metabolism
… nutrients in diverse ecosystems, degradation of organic compounds, and as key members of the human gut microbiome. The absence of oxygen limits the chemistry that bacteria can perform; however, these organisms do make use of organic radical cofactors that are oxygen sensitive. This thesis …
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Dinitroxides in Rapid Scan Electron Paramagnetic Resonance Imaging
… termed, “probes.” These probes are often organic free-radicals such as triarylmethyl (Trityl) radicals or nitroxides. Attention is given here to an example of a nitroxide that has been structured to provide longer intercellular retention time. In addition to the use of nitroxides as …
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Science and Engineering of Spin Triplet Excitons in Luminescent Molecular Semiconductors
… attractive for optoelectronic devices, such as organic light-emitting diodes (OLEDs). Maximising the luminescence from OLEDs requires careful management of spin-triplet excitons, which are typically non-emissive. For successful management, the formation and harvesting dynamics of triplet …
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Addition and recombination reactions of unsaturated radicals using a novel laser kinetics spectrometer
… allowing for the detection of a wide array of organic radical species. Paired with a temperature-and pressure-controlled flow reactor equipped with a Herriott-type optical multiple pass cell, transient absorptions of ~0.0001 can be measured, corresponding to cross section - concentration …
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Exciton dynamics in organic semiconductors for efficient electroluminescent devices
… exciton energy transfer and charge transport in organic semiconductors. In the first part of the thesis, ‘hyperfluorescence’, which is the concept that thermally activated delayed fluorescence (TADF) materials are exploited as an exciton sensitiser to a fluorescent emitter, is investigated. …
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Permanganate oxidations of aromatic hydrocarbons in aqueous and organic solution
… strength. This type of correlation is typical of organic radical reactions. Permanganate's ability to react by hydrogen atom transfer is rationalized on the basis of its ability to form a strong bond to H$\cdot.$In neutral aqueous solution, toluene is oxidized by permanganate over three orders of …
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Phenazine: A Building Block for Multinuclear and Heterometallic Complexes, Where the Ligand Acts as an Electron Acceptor and Radical Abstractor
… (DSSCs). They are the core components in the organic light-emitting devices (OLEDs) due to their ability to emit light with the wavelengths largely red- shifted from their absorption wavelength. Ruthenium based sensitizers have been tagged “molecular light switches” because, although the …
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Radiation biophysical modeling of the FLASH effect: from mechanistic understanding towards clinical endpoint prediction
… (i) transient hypoxia due to O2 depletion, (ii) organic radical recombination, (iii) inter-track effects, or (iv) the immune system-driven effect. However, some of these have been discredited by further experiments. Based on these mechanisms, several mathematical models have been proposed. …