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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 36 for “"Relaxometry"”.
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OPEN SOURCE NMR RELAXOMETRY PLATFORM
… 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 only …
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Role of adsorption in catalysis: applications of NMR relaxometry
… 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 phase …
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NMR Relaxometry and Diffusometry Studies for Investigating Heterogeneous Catalysis
The work described in this thesis mainly concerns the development and 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 …
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A Compressed Sensing Approach to Detect Immobilized Nanoparticles Using Superparamagnetic Relaxometry
<p>Superparamagnetic relaxometry (SPMR) is an emerging technology that leverages the unique properties of biologically targeted superparamagnetic iron oxide nanoparticles to detect cancer. The use of ultra-sensitive sensors enables SPMR to detect tumors ten times smaller than current imaging …
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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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Diffusion and Relaxometry Studies in Mesoporous Systems using Nuclear Magnetic Resonance
… linear hydrocarbon mixtures *in situ* using NMR relaxometry. The carbon number distributions of alkane mixtures were determined with the highest sum of the residuals of ± 0.03. Also, the average carbon numbers from the distributions had a maximum deviation of ± 0.4 carbon number. Also, the …
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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, γ-alumina …
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Contact Free Monitoring of Cell Density in a Bioreactor with Magnetic Resonance Relaxometry
… sampling. In this work, magnetic resonance relaxometry measurements taken through the walls of the bioreactor tubing are used to monitor the cell density in near real-time. Using intracellular iron as the marker, the system detects variations in cell density in minutes, enabling rapid …
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Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics
… 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 dynamics of …
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A COHERENCE-COLORED LOOK INSIDE REVERSE MICELLES: ADVANCING MAGNETIC RESONANCE RELAXOMETRY TO CHARACTERIZE INTERNAL WATER POOL DYNAMICS
… dual resonance (nuclear/electron) liquid state relaxometry technique, Overhauser Dynamic Nuclear Polarization (ODNP), is extended for the first time to the thorough characterization of the translational dynamics of water within reverse micelles (RMs). These results are supplemented with high …
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Development and Application of NMR Diffusometry and Relaxometry Methodologies to Study Organic-Inorganic Interactions at Nanomaterial Surfaces
<p>Colloidal nanomaterials like semiconductor quantum dots (QDs) have size-, shape-, and composition-dependent optoelectronic properties with applications ranging from photovoltaics, to sensing, to medical diagnostics and treatment. These materials also have very high surfaceto- volume ratios, with …
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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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Quantitative MRI correlates of hippocampal and neocortical pathology in intractable temporal lobe epilepsy
… histopathological correlates of quantitative relaxometry and DTI from hippocampal and neocortical specimens of intractable TLE patients. To achieve this goal I developed and evaluated a pipeline for histology to in-vivo MRI image registration, which finds dense spatial correspondence between …
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NMR studies of conduction mechanisms in electrolyte materials for fuel cells
… in ionic conductors. In Chapter 3 19F NMR relaxometry is applied to investigate fluoride ion dynamics in the fluoride conducting superionic material, PbSnF4 and in Chapter 4 1H NMR relaxometry is used to examine proton motions along hydrogen bonds in the novel superprotonic material, …
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Nuclear magnetic resonance readable sensors
… which can be read by magnetic resonance (MR) relaxometry. MR is an advantageous bio-sensor readout because it can be determined from opaque samples and through intervening layers of matter. Wash steps can therefore be avoided in in vitro MR assays and non-invasive interrogation achieved for in …
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MRI techniques for quantitative and microstructure imaging
… diffusion MRI, myelin water imaging, and MR relaxometry. These contrasts provide sensitivity to axonal fibers, myelin concentration, and iron contents for the study of brain microstructures. Specifically, in the first part of this thesis, a fast and high-fidelity diffusion imaging method was …
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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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Small Gadolinium Oxide Contrast Agents: A Novel Class of Multi-Modality Contrast and Therapeutic Agents
… for MR and CT imaging is presented. MR relaxometry and nuclear magnetic relaxation dispersion (NMRD) characterization of the water-proton relaxation properties of small particulate gadolinium oxide and gadolinium oxide albumin microspheres is provided in chapter 3. In chapter 4 the …
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Spatiotemporal Encoding Methods for Brain Magnetic Resonance Imaging
… applications, including diffusion, quantitative relaxometry and functional imaging. The novel encoding strategies in high-dimensional space together with efficient data sampling schemes allow better use of radio-frequency pulse, modern receiver coil arrays and shared data correlation. The high …
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