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Showing 1 to 9 of 9 for “"Kernspinrelaxation"”.
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Kernspinrelaxation von Formaldehyd an Oberflächen und in der Gasphase
Im Rahmen dieser Arbeit wurde die Kernspinrelaxation von Formaldehyd (H2CO) an Oberflächen und in der Gasphase gemessen. Durch selektive Photolyse von ortho-Formaldehyd bei 339,022nm wurde das 3:1-Gleichgewicht zwischen ortho- und para-H2CO gestört und die Geschwindigkeit k1 der darauf einsetzenden …
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Deuteronen-Kernresonanz-Untersuchungen der viskoelastischen Eigenschaften von nematischen Flüssigkristallen mit zwei mesogenen Gruppen
… NMR-Experimente, der Messung der transversalen Kernspinrelaxation im Carr-Purcell-Meiboom-Gill-(CPMG)-Experiment, NMR bei langsamer Probenrotation senkrecht zum Magnetfeld und Rheo-NMR mit Kegel-Platte-Geometrie, gelingt es fünf der acht viskoelastischen Parameter einer nematischen Phase zu …
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Anwendungen der NMR-MOUSE in Prozesstechnik, Materialforschung und Medizin
With the use of the NMR-MOUSE (Nuclear Magnetic Resonance – Mobile Universal Surface Explorer), a small, mobile magnetic resonance sensor, by which the information typically contained in one pixel of an NMR image, information can be collected either in situ or ex situ. This dissertation reveals new …
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Structure property relationships in polyolefins
Changes in the amount of the rigid, semi-rigid, and soft fractions, chain dynamics, and domain thickness of isotactic polypropylene (iPP) were investigated as a function of temperature, storage temperature, storage time, draw ratio, drawing temperature, drawing rate, ethylene propylene rubber …
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Mobile NMR for rock porosity and permeability
Three different mobile Nuclear Magnetic Resonance (NMR) core-scanners were used to measure porosity and permeability of water-saturated drill cores and core plugs in a non-destructive way. In addition to their use in the laboratory, the small and light-weight devices are conveniently shipped, e.g. …
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Characterization of natural porous media by NMR and MRI techniques : high and low magnetic field studies for estimation of hydraulic properties
Soil is the natural material that covers most of the dry surface of the earth. It is the product of mechanical, chemical and biological interactions of different types of elements. Soils have a very complex composition and high variability in their occurrence and properties. The non-homogeneous …
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Low field NMR for analysis of rubbery polymers
The goal of this work is to investigate the molecular dynamics as well as the composition and the structures of different types of industrial polymers such as thermoplastic polyurethanes (TPU) and filled raw EPDM samples. The NMR measurements were restricted to transverse relaxation of the …
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Nuclear magnetic resonance as a tool for on-line catalytic reaction monitoring
Nuclear Magnetic Resonance (NMR) has become a well-established method in many different areas of research. The scope of the disciplines involved is extremely broad ad is still expanding, encompassing chemical, petrochemical, biological and medical research, plant physiology, aerospace engineering, …