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Two dimensional NMR and NMR relaxation studies of coal structure

Zilm, K.W.

United States 1992

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Título:
Two dimensional NMR and NMR relaxation studies of coal structure
Autor: Zilm, K.W.
Assuntos: 01 COAL, LIGNITE, AND PEAT ; 010600 - Coal, Lignite, & Peat- Properties & Composition ; 665100 - Nuclear Techniques in Condensed Matter Physics - (1992-) ; ANGULAR MOMENTUM ; BARYONS ; CARBON 13 ; CARBON ISOTOPES ; CARBONACEOUS MATERIALS ; CHEMICAL ANALYSIS ; COAL ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; CRYSTAL STRUCTURE ; DOCUMENT TYPES ; ELEMENTARY PARTICLES ; ENERGY SOURCES ; EVEN-ODD NUCLEI ; FERMIONS ; FOSSIL FUELS ; FUELS ; HADRONS ; ISOTOPES ; LIGHT NUCLEI ; MAGNETIC FIELDS ; MAGNETIC RESONANCE ; MATERIALS ; MICROSTRUCTURE ; NUCLEAR MAGNETIC RESONANCE ; NUCLEI ; NUCLEONS ; PARTICLE PROPERTIES ; POLARIZATION ; PROGRESS REPORT ; PROTONS ; QUALITATIVE CHEMICAL ANALYSIS ; RELAXATION ; RESONANCE ; SPIN ; STABLE ISOTOPES
Notas: DOE/PC/91285-1
USDOE, Washington, DC (United States)
USDOE
FG22-91PC91285
Descrição: This report covers the progress made on the title project for the project period. Four major areas of inquiry are being pursued. Advanced solid state NMR methods are being developed to assay the distribution of the various important functional groups that determine the reactivity of coals. Special attention is being paid to methods that are compatible with the very high magic angle sample spinning rates needed for operation at the high magnetic field strengths available today. Polarization inversion methods utilizing the difference in heat capacities of small groups of spins are particularly promising. Methods combining proton-proton spin diffusion with {sup 13}C CPMAS readout are being developed to determine the connectivity of functional groups in coals in a high sensitivity relay type of experiment. Additional work is aimed a delineating the role of methyl group rotation in the proton NMR relaxation behavior of coals.
Editor: United States
Data de criação/publicação: 1992
Idioma: Inglês

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Two dimensional NMR and NMR relaxation studies of coal structure

Zilm, K.W.

United States 1992

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