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Showing 1 to 20 of 25 for “"zwitterion"”.
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Anion-induced zwitterion formation in gas-phase arginine
… naturally occurring amino acids are known to be zwitterionic in solution, whereas most adopt canonical structures in the gas-phase. However, complexation with solvent molecules and cations can induce zwitterion formation. This thesis presents experimental and theoretical results that provide …
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Synthesis and Characterization of Zwitterion-Containing Acrylic (Block) Copolymers for Emerging Electroactive and Biomedical Applications
… (BDMAEMA MS), respectively, yielded zwitterionomers and cationomers of comparable chemical structures. Differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), and atomic force microscopy (AFM) revealed that zwitterionomers promoted more well-defined …
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Fading of carbonless copying paper
… when adsorbed on Fulacolor, to give a blue zwitterion. CVL (1) was also shown to adsorb as the unchanged lactone which could be photochemically ring opened. The zwitterion could be displaced readily by water vapour. When a high surface acidity was kept, the zwitterion was more resistant to …
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Functionalized carbon nanotube thin-film nanocomposite membranes for water desalination applications
… The objective of this research was to combine zwitterion-functionalized carbon nanotubes with traditional thin film polyamide (PA) to fabricate a novel desalination membrane which has both high permeability as well as selectivity. Zwitterion functional groups in CNTs act as molecular …
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Functionalized Single Walled Carbon Nanotube/Polymer Nanocomposite Membranes for Gas Separation and Desalination
… selectivities, SWNTs were functionalized with zwitterionic functional groups. Gas sorption in zwitterion functionalized SWNTs was very low compared to in COOH functionalized SWNTs. This result showed that the zwitterionic functional groups are kinetically blocking the gas molecules from …
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Arsonium and phosphonium-functionalized gold nanoparticles for mitochondria targeted therapeutics
… arsonium- and phosphonium- alkylthiosulfate zwitterions and thioacetate salts and gold nanoparticles functionalized with triphenylarsoniumpropylthiolate ligands. Chapter 1 presents a systematic literature review of the preparation of functionalized gold nanoparticles, their biomedical …
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Transport of 5-methyltetrahydrofolic Acid Across the Rat Jejunum
… fall in the concentration of permeable zwitterion at the surface of the epithelial cell. It was found that the radioactive mucosal efflux from the everted sacs of rat jejunum preloaded with the labelled d-methyltetrahydrofolic acid was stimulated in the presence of mucosal unlabelled …
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The Role of Charge Transfer Induced Spin Crossover Complexes on Charge-Separated State Lifetime in Photoelectrochemical Devices
… rates. Two methods were explored 1) the use of zwitterionic ligands, 2) the formation of a multi-component molecularly sensitized interface with [M(pzb)2] (M= Mn, Fe, and Co). In the first approach, the Lewis base of the zwitterion ligand affects redox potential and the magnetic properties. By …
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Synthesis and Assembly of Dihydroindolizines on Gold Surfaces for Light Induced Work Function Alterations
… was found to be related to the stability of the zwitterion before the electrocyclization to the spiro species.</p>
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The crystal landscape and cocrystallization of primary aromatic sulfonamides
… their cocrystallization with a range of neutral, zwitterionic and ionic coformers has been carried, with a strong focus on coformers that have the potential for sulfonamide drug development. Chapter One discusses and illustrates the literature for the solid-state and supramolecular chemistry of …
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Phosphinimide complexes of titanium: Synthesis and reactivity studies of a new family of organometallic compounds.
… 3] 95 was shown to be zwitterionic in nature. Some titanium-phosphinimide complexes were titrated with MAO to elucidate possible catalyst activation and deactivation pathways. It was determined that reaction of trimethylaluminum with certain titanium-phosphinimide alkyls …
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Molecular insights on the solvent effect of methanol additive in glycine polymorph selection
… for hydrogens attached to a-carbon in glycine zwitterion. Solution and interface simulations in water and 50% v/v water-methanol solutions reveal the mechanism through which methanol additive results in the crystallization of the least stable [Beta]-glycine polymorph. Free energy calculations …
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Understanding the Role of Anisotropy on the Optoelectronic and Colloidal Properties of Quantum Rods for Programmable Self-Assembly with DNA Origami
… their surface with both lipoic acid-appended zwitterion (LA-ZW) ligands using a photo-ligation route, and single-stranded DNA (ssDNA) using a protection-deprotection strategy. The resulted rods had good colloidal stabilities with the optical properties well-preserved in aqueous environments. …
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Stabilization of electron-deficient sulfur by neighboring sulfur and oxygen groups.
… the acid/base chemistry of the α-amino acid. The zwitterion shows the strongest neighboring group participation. Controlled potential electrolysis led to the formation of two diastereomeric sulfoxides in a two electron process. The diastereomer ratio was suggestive of participation by the …
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Advancing Forward Osmosis for Energy-efficient Wastewater Treatment towards Enhanced Water Reuse and Resource Recovery
… membrane modification (i.e., surface coating of zwitterion-functionalized carbon nanotubes). Significantly reduced RSF (> 50% reduction) was obtained in both approaches with minor energy/material investment. With two major bottlenecks being properly addressed for energy-efficient water …
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Novel Poly(N-substituted glycine)s : synthesis, post-modification, and physical properties
… competing side reactions to occur (eg. zwitterion monomer mechanisms). A bulk-polymerization strategy provided molecular weights up to 11 kDa within 24 hours but suffered from low monomer conversions (ca. 25%). Likewise, a preliminary study towards alcohol promoted ROP of NNCAs suffered …
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Effects of Functionality and Charge in the Design of Acrylic Polymers
… amphiphilic polymer products. For the first time zwitterion-containing copolymers were electrospun to form nanoscale fibers with diameters as low as 100 nm. Free radical copolymerization of nBA and sulfobetaine methacrylamide produced zwitterionic copolymers with 6-13 mol % betaine. Dynamic …
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Development of Novel High Temperature Mixed Matrix Membranes (MMMs) for Oil Sands Wastewater Treatment
… (MMMs) prepared by mixing super-hydrophilic zwitterionic materials and inorganic nanoparticles into the host membrane are anticipated as a next membrane generation for OSPW treatment by achieving multi-functionalities beyond excellent fouling resistance, such as, improved water permeability, …
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Synthesis and characterization of aminated perfluoro polymer electrolytes
… attributed to the formation of a predominately zwitterionic polymer when exposed to a strong base. Removal of the sulfonamide proton following counterion exchange with a strong base and formation of a zwitterion was confirmed by FTIR with the absence of a primary amine stretch between 3000-3600 …
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Studies of catalysis of the hydrolysis of phenyl glycinate and some related esters
… formation. The possibility of hydrolysis at the zwitterion stage is considered. New data are also reported for 4-nitrobenzaldehyde catalysis for comparison with those of the phenyl and 4-methoxyphenyl esters.
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