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Showing 1 to 11 of 11 for “"Field-cycling"”.
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Inverse Methods for Fast Field Cycling and NMR Correlation Experiments
… correlation or exchange experiments and new fast field cycling (FFC) modelling approaches. Moreover, the theoretical framework to consider fast field cycling as an inverse problem is provided and the possibility to employ established regularization methods for the inversion of NMR dispersion …
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Molecular dynamics of polymers by means of NMR field cycling relaxometry
… of frequencies and temperatures employing NMR field cycling relaxometry, and WLF master curves were reconstructed to describe the dispersion over more than nine orders of magnitude. Influences of chemical and physical constraints on the relaxation dispersion of polymers were investigated. This …
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Polymer Melts Investigated by Field Cycling NMR Relaxometry: From Simple Liquid to Reptation Dynamics
… of linear polymer melts by applying 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 …
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Molecular Liquids and Polymers Investigated by Field Cycling 1H NMR Relaxometry: Impact of Rotational and Translational Dynamics on Relaxation
In this 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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The Development of Alkoxy-Based Sol -Gel Processing for Magnetoresistive Manganite Thin Films
… to the fine-grain microstructure. Weak-field cycling between +/-500 Oe yielded symmetrical loops with appreciable linear regions, a highly-desirable characteristic for magnetic sensing applications.
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Supramolecular approaches to cryorelaxors for biological NMR studies
… using a variety of techniques including MAS and Field Cycling NMR experiments and Inelastic Neutron Scattering spectroscopy. Crystallographically disordered methyl-group environments have been identified in a number of cases and their proton spin-lattice relaxation behaviour has been shown to be …
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The development of alkoxy-based sol-gel processing for magnetoresistive manganite thin films
… to the fine-grain microstructure. Weak-field cycling between ±500 Oe yielded symmetrical loops with appreciable linear regions, a highly-desirable characteristic for magnetic sensing applications.
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Applying NMR Relaxation Methods to the Study of Liquids in Porous Media
… catalyst and a catalyst support. Ratios of fixed field T1 and T2 values were compared with fast field cycling (FFC-) NMR measurements. For each technique the relative advantages and disadvantages were explored, and methodologies allowing a robust implementation of these techniques to study the …
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Dynamics of liquids in porous media: Investigating competitive adsorption using NMR relaxometry
… NMR relaxometry method that was applied was Fast Field Cycling (FFC) NMR, which has been shown to quantitatively probe surface-adsorbate interactions of liquids in porous media. First, a model study of binary liquid mixtures imbibed within anatase titania and γ-alumina was performed to assess the …
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A magnetic resonance study of the screening of electric fields in metals
We have observed zero field resonance in zinc-doped aluminum samples by means of the Ramsey-Pound magnetic field cycling technique. Experiments were performed near 1.2o K in order to obtain Tl sufficiently long to perform a cycle in a time less than Tl , Near 53.5 kc/sec and 27 kc/sec we see pure …
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Dielectric Properties of Molecular Glass Formers; from the Liquid State to the Tunneling Regime
… by dielectric spectroscopy) and l = 2 (probed by field cycling NMR and light scattering) is carried out. As demonstrated for glycerol, the NMR and light scattering spectra above Tg are scaled according to FTS over 15 decades in frequency. Significant differences in the spectral shape of the …