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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 275 for “"Fluorinated"”.
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Stable Fluorinated Antimicrobial Coatings
… with copolyoxetane soft blocks consisting of fluorinated and quaternary ammonium side chains can act as good antimicrobials. However, stabilizing the positive charge on the surface has been a challenge. The dissertation is aimed at creating a surface modifier that would confer a stable contact …
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Heavily fluorinated electronic polymers
Building blocks, containing majority fluorine content by weight, for PPEs and PPVs have been synthesized. Some of the monomers were shown to give exclusively fluorous-phase soluble polymers, the syntheses of which were achieved by fluorous biphasic polymerization conditions. Perfluoroalkylated PPEs …
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Fluorinated amino acid derivatives
A new approach in the syntheses of 3-bromo-2-butanone and 2-bromo-3-fluorobutane has been developed. All attempts to alkylate the sodium salt of diethyl malonate, ethyl acetoacetate, or diethyl acetamidomalonate with 2-bromo-3-fluorobutane failed. New phosphonoacetates, tert-butyl and benzyl …
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Characterization of fluorinated carbon nanotubes
Reaction temperatures and time are probed to get the optimal fluorination conditions in order to produce C2F carbon nanotubes. Possible fluorotube structures are optimized with molecular mechanics calculation. Results show that fluorines would like to add along the circumference of the tubes …
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Partially-Fluorinated Polyimides using Aliphatic Diamines
Two series of polyimides were created in order to address several of the existing problems with gas permeation membranes used today. These issues include the lack of flexibility and inverse ratio that exists between selectivity and permeation. The approach taken in order to solving the flexibility …
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Biosynthesis of Fluorinated Natural Product Nucleocidin
Nucleocidin is a fluorinated adenosine analogue produced by Streptomyces calvus. It is one of only six known fluorinated natural products. The 4’-fluorine substituent on nucleocidin requires a unique two-step fluorination mechanism: C-H bond cleavage followed by stereospecific glycosylation of the …
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Fluorinated Organic Molecules for Medicinal Applications
<p>The significant applications of fluorinated molecules in the pharmaceutical, agrochemical, and material sciences make them attractive synthetic targets. Difluoromethylation methods are of exceptional value and a limited number of techniques are available to perform that transformation. The …
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Fluorinated boranes in dehydrocoupling and hydroboration
This thesis describes the chemistry of the Lewis adducts of mono- and bis-(pentafluorophenyl)borane (LB·BHn(C6F5)3−n; n = 1, 2; LB = SMe2, NH3) as it applies to the development of novel perfluoroarylboranes. Chapter 2 details the use of Me2S·BHn(C6F5)3−n in the preparation of the pentafluorophenyl …
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Uranium Enrichment Signatures of Fluorinated Epoxy
… in the glass transition temperature in UV cured fluorinated epoxy (a material which can be used uranium enrichment cascades) at doses equivalent to enriching enough uranium to make on the order of 1 significant quantity (IAEA standard). This change in the glass transition temperature is likely …
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Fluorinated Metal Complexes as MRI Contrast Agents
Magnetic resonance imaging (MRI) is a vital tool in today’s modern healthcare system. MRI is preferred over positron emission tomography (PET) and X-ray computed tomography (CT) because it is non-invasive, non-radioactive, and provides 3-D imaging directly in vivo. Contrast agents are used in order …
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FLUORINATED RESPONSIVE LANTHANIDE COMPLEXES FOR MAGNETIC RESONANCE
A series of novel fluorinated lanthanide complexes has been synthesised for use as responsive probes for 19F MRS and MRI. The careful positioning of the CF3 group within 6.5 Å from the metal ion caused the fluorine longitudinal and transversal relaxation rates to be strongly enhanced. This allows …
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Ionisation studies of chlorinated and fluorinated compounds
Ionisation processes in gas-phase polyatomic molecules have been studied using threshold photoelectron photoion coincidence and selected ion flow tube techniques for cations and an electron attachment mass spectrometer for anions. Cation formation has been studied for fluoroform (CHF\(_3\)), …
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Synthesis and characterization of fluorinated cellulose derivatives
The synthesis of fluorinated cellulose derivatives was pursued for the purpose of investigating the effects of fluorine on the interfacial properties of cellulose derivatives, in multiphase materials. Synthetic approaches included: 1) the replacement of hydroxyl groups on cellulose with fluorine …
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Synthesis of Highly Fluorinated Diels-Alder Polyphenylenes
… and oleophobic character, as compared to non-fluorinated analogues. Meanwhile, Diels-Alder polyphenylenes (DAPPs) are known for thermal stability as well as their rigid structure and glassy physical characteristics, which have led to a variety of film and membrane applications. This …
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Thermochemical properties of fluorinated hydrocarbons, hydroperoxides, and fluorinated hydroperoxides; thermochemistry and kinetics on dissociation and association reactions of oxiranyl radical
Thermochemical properties on fluorinated hydrocarbons, alcohol, hydroperoxides, and alkyl hydroperoxides are determined. Reaction kinetics and modeling on the three member ring cyclic ether radical, oxiranyl radical, are studied under atmospheric and combustion environments. Molecular geometries, …
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Hydrophobic, fluorinated silica xerogel for low-k applications.
A new hydrophobic hybrid silica film was synthesized by introducing one silicon precursor (as modifiers) into another precursor (network former). Hybrid films have improved properties. Hydrolysis and condensation of dimethyldiethoxysilane (DMDES) (solvent (EtOH) to DMDES molar ratio R = 4, water to …
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Fluorinated Metallo Phthalocyanines for Chemical and Biological Catalysis
… generating the 3<sup>rd</sup> generation fluorinated phthalocyanines. Fluorophthalocyanines exhibiting a ratio, ρ, of aliphatic/aromatic fluoro groups, ρ, ρ does not equal to 1.0 constitute the 2<sup>nd</sup> generation fluorinated phthalocyanines.</p> <p>The amino functionalized complexes …
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Electrical characterization of fluorinated and oxynitrided gate-oxides
… processes. There are various ways to fabricate fluorinated and oxynitrided SiO 2 films. In this work, fluorination is done by shallow F-ion implantation through polysilicon gate, followed by thermal diffusion into the underlying gate oxide. Oxynitridation is done by a heat treatment in N 2 O …
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