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Transverse NMR relaxation of water in wood

✍ Scribed by M. T. Riggin; A. R. Sharp; R. Kaiser; M. H. Schneider

Publisher: John Wiley and Sons
Year: 1979
Tongue: English
Weight: 474 KB
Volume: 23
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1979.070231101

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✦ Synopsis

The transverse NMR relaxation times of hydrogen nuclei of water absorbed in white spruce sapwood [Picea glauca (Meunch) Voss] were measured for moisture contents in the range from 5 to 176%.

The spin echo amplitudes resulting from the Carr-Purcell sequence decay nonexponentially suggesting the possibility of a t least two different relaxation times for water in wood. A simplified structural model of the wood-water mixture is used to estimate the rates of chemical exchange at room temperature of hydrogen nuclei between various sites in the system. The high-resolution NMR line shape is discussed briefly in terms of this proposed model.

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