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 18 of 18 for “"NMR relaxometry"”.
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OPEN SOURCE NMR RELAXOMETRY PLATFORM
… cost, open source hardware platform for use in NMR relaxometry experiments. The platform is capable of a wide variety of relaxometry experiments comprising many magnet, coil, and sample combinations. The majority of the RF chain is broadband, allowing operation over a large frequency range with …
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Role of adsorption in catalysis: applications of NMR relaxometry
… the development of Nuclear Magnetic Resonance (NMR) relaxometry methods and the comparison with traditional catalytic was performed with a series of C5 and C6 unsaturated hydrocarbons on two different alumina supports, γ- and θ-Al2O3. The developed techniques were applied in the study of liquid …
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NMR Relaxometry and Diffusometry Studies for Investigating Heterogeneous Catalysis
… implementation of nuclear magnetic resonance (NMR) methods to provide quantitative information on chemical conversion within a novel NMR compatible trickle-bed reactor (TBR). Techniques to map the distribution of chemical species within a catalyst bed were implemented under non-steady state and …
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Developments in 2D NMR relaxometry and its application to biological tissue
Abstract In this thesis the capability of 2D NMR relaxometry to distinguish between different biological tissues is established using fresh unpreserved samples of lamb’s liver and kidney. A novel use of 2D T1-T2 relaxation spectra to provide characteristic profiles of specific tissues in specific …
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Dynamics of liquids in porous media: Investigating competitive adsorption using NMR relaxometry
… has been focused towards the development of NMR relaxometry methods to investigate competitive adsorption and microphase separation of liquid mixtures imbibed within porous media. The work was done on three different mesoporous catalysts and catalyst supports, namely anatase titania, …
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Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics
… Field Cycling Nuclear Magnetic Resonance (FC NMR) relaxometry. The objective is to understand their microscopic dynamics and its dependence on the molecular mass (M) of the polymer chains. With the commercial availability of FC NMR relaxometers, the method gained attraction for studying …
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Molecular Liquids and Polymers Investigated by Field Cycling 1H NMR Relaxometry: Impact of Rotational and Translational Dynamics on Relaxation
… thesis field-cycling nuclear magnetic resonance relaxometry (FC NMR) is applied to measure the spin-lattice relaxation time, T1, of proton spins in condensed matter not only at different temperatures but also at different Larmor frequencies, ω. The results are presented by means of six …
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NMR studies of conduction mechanisms in electrolyte materials for fuel cells
… to be applied in fuel cells were studied by NMR techniques. By gaining detailed mechanistic insight into charge transport we hope to contribute to the development of these materials. In the first part of this thesis charge conduction mechanisms is investigated in ionic conductors. In Chapter …
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Diffusion and Relaxometry Studies in Mesoporous Systems using Nuclear Magnetic Resonance
… been examined using Pulsed Field Gradient (PFG) NMR. This includes a diffusion study of binary mixtures consisting of *n*-dodecane and one of octane isomers. It has shown that linear octane diffuses distinctively faster than branched octane isomers, indicating physical restriction to diffusion …
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Modular Magnetic Relaxation Nanomaterial Biosensor Platform for Local, Integrative Chemical Monitoring
… exposure, colloidal nanoparticle, magnetic relaxometry assays coupled with single-sided NMR relaxometry for clinic and point-ofcare, resource-limited settings are a promising technology for in vivo biosensing. Through a multidimensional combination of nanotechnology, diagnostic device …
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Transport and Anisotropy inside Ionic Polymer Membranes
… 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 polymers, from poly(arylene …
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Characterising Adsorption and Mass Transfer in Porous Media
… two-dimensional (2D) nuclear magnetic resonance (NMR) correlation techniques to unambiguously discriminate and characterise competitive adsorption and mass transfer processes in porous materials. This has primarily involved investigations on porous oxides; in particular silicas and aluminas …
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Characterization of tight and shale unconventional gas reservoirs using low field NMR
… efficiency. Nuclear Magnetic Resonance (NMR) offers fast and non-disruptive detection of the reservoir samples properties. The purpose of this research is to investigate the interactions between tight and shale rocks with hydrocarbons using NMR technique. This thesis mainly presents …
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NMR Studies of Enhanced Oil Recovery Core Floods and Core Analysis Protocols
… In this thesis nuclear magnetic resonance (NMR) has been used for quantitatively, non-invasively and dynamically studying laboratory core floods at reservoir-representative conditions. Spatially-resolved relaxation time measurements (L-T1-T2) have been applied to studying a special core …
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Nuclear Magnetic Resonance for the Characterisation of Hot-Melt Extruded Pharmaceutical Amorphous Solid Dispersions
… HME process, by means of high-temperature PFG NMR. These measurements were performed in the absence of any solvents, for a range of drug loadings, temperatures, polymer systems and drug species. The mechanism of the diffusion process and its relationship to viscosity was explored with the …
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Study of Adsorbate Interactions of Alumina Surfaces Using Nuclear Magnetic Resonance Methods
… high throughput experimentation (HTE), advanced NMR techniques, multivariate linear regression (MLR), X-ray diffraction (XRD), nitrogen porosimetry and thermogravimetric analysis (TGA) to address the fundamental research questions; what is the role of water in thermal, hydrothermal pretreatments …
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The Development of Sustainable Internal Curing Agents Using Natural Hollow Fibres
… paste systems, using Nuclear Magnetic Resonance (NMR) and Differential Scanning Calorimetry (DSC). The observations revealed that both the morphological features and the release of extractives such as lignin impact the desorption kinetics of MW fibres' entrained water within cementitious matrices. …
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Development and Application of NMR Diffusometry and Relaxometry Methodologies to Study Organic-Inorganic Interactions at Nanomaterial Surfaces
… solution-state nuclear magnetic resonance (NMR) methodologies to probe the interactions between this inorganic core and the organic capping layer. I investigated the dynamic surface binding of perovskite QDs via utilization of DOSY NMR to quantify changes to their surface dynamics as a …