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 11 of 11 for “"pulsed-field-gradient NMR"”.
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Microscopic diffusion measurements with nanoporous materials: complementary benefits of infrared microimaging and pulsed field gradient NMR
… namely infrared (IR) microimaging and pulsed field gradient (PFG) NMR. The dissertation contains mainly five chapters. The first chapter introduces diffusion phenomena in general and concisely explains the importance and the current challenges of the investigation of molecular diffusion …
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The measurement of the diffusion coefficient of water in poly (ethylene oxide) water solutions using a nuclear magnetic resonance pulsed field gradient technique
Nuclear magnetic resonance (NMR) techniques have often been used in studies of the interaction of water molecules with complex macromolecular structures such as proteins and polymers. We have measured the diffusion coefficient of protons in water/poly (ethylene oxide) solutions as a function of …
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Tuning polymeric chiral surfactants for enhanced enantiomeric recognition in micellar electrokinetic chromatography
… the polymeric surfactants was obtained by use of pulsed field gradient-NMR (PFG-NMR). A superior chromatographic performance in MEKC was demonstrated by the modified polymeric surfactants as compared to the non-modified polymeric surfactants. A correlation between the polarity and the size of the …
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EFFECTS OF OSMOLYTES ON THE CONFORMATIONAL STABILITY AND HYDRODYNAMIC RADII OF IMMUNITY PROTEIN 9 AND HUMAN SERUM ALBUMIN
… and hydrodynamic radii (Rh) were measured with pulsed-field gradient NMR. The unfolding curves of Im9 and HSA are shifted to higher urea concentration so that Urea1/2 and GH2O increased, as the osmolyte concentration was increased indicating that Im9 and HSA are more stable in the presence of …
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Process Applications of NMR
This thesis describes applications of NMR techniques to flowing liquid streams to obtain quantitative information about the contents of the streams. The quantitative accuracy of NMR spectroscopy for composition measurement of liquid mixtures is measured as ±0.34 mol% and ±1 mol% for static and …
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Acetate-based Electrolytes for Aqueous Zinc-ion Batteries: An Investigation of the Zinc Anode
… a combination of molecular dynamics simulations, pulsed-field-gradient NMR, and rotating-disk-electrode electrochemistry, I first show how increasing KOAc concentration from 5 m to 27 m transforms the solvation environment into an ion-coordinated network that dramatically slows HER/OER kinetics …
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Transport and Anisotropy inside Ionic Polymer Membranes
… of a standard protocol for calibrating high pulsed-field-gradient NMR. I show that high gradient calibration using low γ nuclei is not amenable to measurements on slow diffusing high γ nuclei. Then I employ NMR diffusometry to investigate transport and anisotropy for a series of ionic …
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Signal sampling and processing in magnetic resonance applications
… are developed for Nuclear Magnetic Resonance (NMR) relaxation and diffusion experiments. $L_1$ regularization is recommended for extracting parameter distributions which are a priori known to be composed of sparse features. $L_1$ regularization is shown to be stable at signal-to-noise ratios < …
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Design and Characterization of Electrospun Mats with Tailored Morphologies for Enhanced Active Layer Performance in Energy Conversion and Energy Storage Applications
… data suggest PEO to be a superior electrolyte, pulsed-field-gradient NMR shows that lithium diffusion is faster in PVDF samples. From coin cell discharge experiments, PEO is believed to interact strongly with Li+ ions, inhibiting them from diffusing rapidly during fast charge/discharge rates. …
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Characterization of catalyst pellets using NMR and MRI: MRI, diffusion and relaxation measurements of liquid imbibed in alumina and titania extrudates
… are studied using Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI) techniques with the aim of characterizing mass transport in the pellets and exploring the presence of spatial heterogeneities formed in the manufacturing process. Measurements have been done both in bulk, …
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MRI and NMR Investigations of Transport in Soft Materials and Explorations of Electron-Nuclear Interactions for Liquid-State Dynamic Nuclear Polarization
… with emphasis on methods utilizing magnetic field gradients - magnetic resonance imaging (MRI) and pulsed-field-gradient (PFG) NMR. The second part (Chapter 5) presents enhancements to dynamic nuclear polarization, an intensity enhancement approach for magnetic resonance techniques. In …