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Showing 1 to 20 of 55 for “"Perfluorinated"”.
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Radon Solubility in Perfluorinated Compounds
Made available in DSpace on 2017-07-06T18:55:07Z (GMT). No. of bitstreams: 3 Lewis_Christopher_J_MS.pdf: 51074267 bytes, checksum: f00a3efbc1f4f166fe98af904a1bd2e2 (MD5) Lewis_Christopher_J_MS_ABS.pdf: 850751 bytes, checksum: 1bd26357977699db68bfe3e2fe93562c (MD5) license.txt: 4813 bytes, checksum: …
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Hydrolysis and Atmospheric Oxidation Reactions of Perfluorinated Carboxylic Acid Precursors
… followed by loss of isocyanic acid to give a perfluorinated radical. The perfluorinated radical then produces PFCAs by a series of known atmospheric reactions. Finally, the biological hydrolysis of the polyfluoroalkyl phosphate monoesters (monoPAPs) were studied in vitro using a bovine …
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Catalytic Decomposition of a Perfluorinated Carbon Proxy Using Alumina-based Catalysts
Alumina (Al2O3) from a range of sources have been investigated as potential catalysts for the destruction of fluorocarbon gases produced in the aluminium smelting process. Alumina is the feed used in aluminium production and contains Lewis acid sites on its surface. Under calcined aluminas, such as …
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Comparison of transport effects of perfluorinated and hydrocarbon surfactants on environmental co-contaminants
… OF TRANSPORT EFFECTS OF PERFLUORINATED AND HYDROCARBON SURFACTANTS ON ENVIRONMENTAL CO–CONTAMINANTSByRashad Najee Simmons The use of groundwater as drinking water justifies efforts for the prevention and remediation of groundwater contamination by environmental …
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Influence of Sidechain Structure and Interactions on the Physical Properties of Perfluorinated Ionomers
The focus of this dissertation was to investigate the influence of sidechain structure and sidechain content on the morphology and physical properties of perfluorosulfonic acid ionomer (PFSA) membranes. One of the primary objectives was to characterize the thermomechanical relaxations for short …
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Counterion identity effects on the self-assembly processes in a series of perfluorinated surfactant - water mixtures
The effects of counterion on the lyotropic liquid crystalline phase behaviour of some quaternary ammonium salts of perfluorodecanoic acid in water have been studied using a combination of optical polarising microscopy (OPM), deuterium nuclear magnetic resonance (211 NMR) and cryo-transmission …
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Extraction, transport, and transformation of poly- and perfluoroalkyl substances in soils impacted by aqueous film-forming foam
Poly- and perfluorinated alkyl substances (PFASs) are a class of recalcitrant environmental contaminants used in a variety of industries and consumer products. Use of aqueous film-forming foams (AFFF) at military bases and airports is one significant source of PFAS contamination to groundwater and …
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REMOVAL OF EMERGING CONTAMINANTS FROM AQUEOUS SOLUTION BY OZONE -BASED PROCESSES
… were tested. For this study 1-4, dioxane, perfluorinated compounds (PFCs), N,N-Diethyl-metatoluamide, and three pharmaceuticals sulfamethoxazole, trimethoprim and carbamazepine have been selected. The effect of different process parameters such as chemical dosages, ozone weight percent, …
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Ultra-High Vacuum Studies of Model Boundary Layer Lubricants
… of a set of straight-chain carboxylic acids and perfluorinated carboxylic acids onto the Ag(110) surface. The carboxylic acids are found to desorb reversibly from the clean Ag(110) surface. For monolayer coverages of the acids, the corresponding peak temperature maximum in the Temperature …
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Functionalized single-walled carbon nanotubes for composite applications and radiation studies
… and alkylated chains that have also been perfluorinated. In addition to these materials, F-SWNTs have been modified with amino acids and silanes of various lengths. Finally, the F-SWNTs, Urea-F-SWNTs, and alkylated and perfluorinated SWNTs have been further employed in new composite …
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Polymeric nanocarriers with dendritic core-shell architectures
… to stabilise metal nanoparticles in water and in perfluorinated phases after appropriate functionalisation.
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BRIDGING EXPERIMENT AND THEORY IN PORPHYRIN CHEMISTRY: DEVELOPING MATERIALS FOR SENSING, OPTICAL, AND CATALYTIC TECHNOLOGIES
… (University of Milan), in which ZnTPP and its perfluorinated analogue ZnTPPF20 had been compared, we broadened this effort to evaluate our newly synthesized β-substituted porphyrins in chemoresistive SnO2-based sensors. After optimizing the synthesis of the target porphyrins, we assessed their …
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Properties and Performance of Polymeric Materials Used in Fuel Cell Applications
… development. First, the correlation between perfluorinated ionomer membranes and processing/performance issues in fuel cell systems was investigated. As confirmed by small-angle X-ray scattering data, impedance analysis, and dynamic mechanical analysis, solution processing with mixed …
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Rational design of proton exchange membranes: perfluoro polymers with sulfonic acid and heteropoly acid functionalities
The state of the art in the field of perfluorinated sulfonic acid (PFSA) membranes is dictated by our understanding of pure PFSA ionomer materials like Nafion®, which performs well at saturated conditions but fails at low relative humidity and high operating temperatures (80-120 C). The motivation …
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Chemical and physical aspects of wear processes in polymers
… conditions. The resulting fragmentation of the perfluorinated compound is discussed and a simplified degradation mechanism suggested.
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An investigation of nafion electrospray emitter tips
… for this work was to investigate Nafion, a perfluorinated sulfonic acid ionomer, as an alternative to the porous materials currently used for electrospray emitters. A common, repeatable method of manufacturing Nafion single emitter tips and arrays with different mixture ratios of Nafion and …
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Investigation of Biotransformation of 6:6 PFPiA into C6 PFPA during Anaerobic Digestion of Sludge
The biotransformation of perfluorinated phosphinic and phosphonic acids (PFPiAs & PFPAs) have been studied in animal and plant models, but not in wastewater treatment plant sludge. This is concerning since the toxicity and general research into PFPiAs and PFPAs is lacking and biosolids, a …
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Fluorocarbene, Fluoroalkyl, and Fluoride Complexes of First-Row Transition Metals
… important metathesis/polymerization reactions of perfluorinated alkenes. While considerable work is still needed to make these proposed reactions a reality, this thesis outlines contributions from our research group. We showed that cobalt fluorocarbene complexes CpCo(=CFRF)(PPh2Me) (RF = F, CF3) …
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Synthesis of fluorinated polymers in supercritical carbon dioxide (scCO₂)
… dioxide (scCO₂) at 120 °C and 1500 bar. Using perfluorinated hexyl iodide as CTA, polymers of low polydispersity ranging from 1.5 to 1.2 at the highest iodide concentration of 0.25 mol·L-1 were obtained. Electrospray ionization- mass spectroscopy (ESI-MS) indicates the absence of initiator …
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