The hydration of paper studied with solid-state magnetisation-exchange H-1 NMR spectroscopy

Garvey, C. J., Parker, I. H., Simon, G. P. and Whittaker, A. K. (2006) The hydration of paper studied with solid-state magnetisation-exchange H-1 NMR spectroscopy. Holzforschung, 60 4: 409-416. doi:10.1515/HF.2006.064

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Author Garvey, C. J.
Parker, I. H.
Simon, G. P.
Whittaker, A. K.
Title The hydration of paper studied with solid-state magnetisation-exchange H-1 NMR spectroscopy
Journal name Holzforschung   Check publisher's open access policy
ISSN 0018-3830
Publication date 2006-07
Sub-type Article (original research)
DOI 10.1515/HF.2006.064
Open Access Status File (Publisher version)
Volume 60
Issue 4
Start page 409
End page 416
Total pages 8
Place of publication Berlin, Germany
Publisher Walter De Gruyter & Co
Collection year 2006
Language eng
Abstract The wide-line H-1 nuclear magnetic resonance (NMR) spectrum of paper in equilibrium with ambient humidity consists of super-imposed relatively broad and narrow lines. The narrower line is of the order of 2 kHz wide at half the maximum height, while the broader line is of the order of 40 kHz in width at half height. On the basis of these line widths, the narrow line is assigned to water sorbed to the paper, and the broad line to the polymeric constituents of the paper. It was not possible to distinguish between the various polymeric components of paper contributing to the H-1 NMR spectra. A modified Goldman-Shen pulse sequence was used to generate a spatial magnetisation gradient between the polymer and water phases. The exchange of magnetisation between protons associated with water and those associated with the macromolecules in paper was observed. The exchange of magnetisation is discussed within a heat transfer model for homonuclear dipolar coupling, with exchange being characterised by a spin-diffusion coefficient. Consideration of the magnitude of the initial rate of the exchange process and estimates of the spin-spin relaxation times based on H-1 line widths indicate that some water must exist in a sufficiently immobile state as to allow homonuclear dipolar interactions between adjacent polymer and water protons. Thus, water sorbed onto paper must exist in at least two states in mass exchange with each other. This observation allows certain conclusions to be drawn about the ratio of free/bound water as a function of moisture content and the dispersal of water within the polymer matrix.
Keyword Hydration
NMR spectroscopy
Spin diffusion
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 09:21:05 EST