Contrast in solid-state NMR imaging Part IIb: Advanced filters, spectroscopic parameters, and sample manipulation

Blümich, Bernhard

doi:10.1002/(sici)1099-0534(1999)11:3<147::aid-cmr3>3.0.co;2-c

Cited by 5 publications

(1 citation statement)

References 105 publications

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“…These types of NMRI experiments include spin−spin ( T 2 ), spin−lattice ( T 1 ), and rotating frame spin ( T 1 ρ ) relaxation-based experiments. The reader is referred to more comprehensive review articles and books on the subject of NMRI and relaxation filters. ,− In many instances the NMR relaxation parameters can be directly correlated to physical properties within the material. For example, the NMR 1 H T 2 relaxation time has been shown to be a sensitive measure of local chain mobility and is inversely proportional to the square of the reduced effective dipolar coupling. − , Changes in the NMR T 2 relaxation times have been correlated to polymer modulus, induced stress, cross-link density, and/or the degree of polymer chain entanglement.…”

Section: Introductionmentioning

confidence: 99%

Relaxation Nuclear Magnetic Resonance Imaging Investigation of Heterogeneous Aging in a Hydroxy-Terminated Polybutadiene-Based Elastomer

et al. 2005

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Relaxation nuclear magnetic resonance imaging (R-NMRI) was employed to investigate the effects of thermooxidative aging in a hydroxy-terminated polybutadiene (HTPB)-based elastomer. A series of three-dimensional (3D) Hahn-echo-weighted single-point images (SPI) of the elastomer were utilized to generate a 3D parameter map of the aged material. NMR spin-spin relaxation times (T 2) were measured for each voxel producing a 3D NMR parameter (T2) map of the aged polymer. These T2 maps reveal a dramatic reduction of local polymer mobility near the aging surface with the degree of T2 heterogeneity varying as a function of aging. Using correlations between NMR T2 and material modulus, the impact of this heterogeneous thermooxidative aging on the material properties is discussed.

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Section: Introductionmentioning

confidence: 99%

Relaxation Nuclear Magnetic Resonance Imaging Investigation of Heterogeneous Aging in a Hydroxy-Terminated Polybutadiene-Based Elastomer

et al. 2005

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Nuclear Magnetic Resonance, Imaging of Polymers

Blümler¹,

Hafner²

2009

Encyclopedia of Analytical Chemistry

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Nuclear magnetic resonance (NMR) imaging is a noninvasive technique, which is based on the phenomenon of NMR. The resonance frequencies of the nuclear spins can be made spatially dependent by introducing a magnetic‐field gradient into the NMR experiment. The acquired NMR signal is thus spatially encoded and a spin‐density image of the sample can be reconstructed. While originally developed for medical applications, NMR imaging is now increasingly applied for materials investigations. The main advantages of the technique are its nondestructivity, which allows processes to be investigated in situ, and the possibility of introducing NMR spectroscopic information and relaxation contrast into the NMR images. The limitations, on the other hand, are the relatively low sensitivity and the broad NMR lines of polymers, both of which limit the spatial resolution. Whereas the latter can be dealt with by suitable methods, the sensitivity ultimately restricts the achievable spatial resolution of conventional NMR imaging techniques to about (10 µm) 3 . NMR imaging therefore must not be considered as a competitor of other microscopic techniques such as electron microscopy but as a characterization technique that provides supplementary information. Examples illustrating all these aspects are given in this article.

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Solid-state 27Al MRI and NMR thermometry for catalytic applications with conventional (liquids) MRI instrumentation and techniques

Koptyug

Sagdeev

Gerkema

et al. 2005

Journal of Magnetic Resonance

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Contrast in solid-state NMR imaging Part IIb: Advanced filters, spectroscopic parameters, and sample manipulation

Cited by 5 publications

References 105 publications

Relaxation Nuclear Magnetic Resonance Imaging Investigation of Heterogeneous Aging in a Hydroxy-Terminated Polybutadiene-Based Elastomer

Relaxation Nuclear Magnetic Resonance Imaging Investigation of Heterogeneous Aging in a Hydroxy-Terminated Polybutadiene-Based Elastomer

Nuclear Magnetic Resonance, Imaging of Polymers

Solid-state 27Al MRI and NMR thermometry for catalytic applications with conventional (liquids) MRI instrumentation and techniques

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