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Moisture in softwoods: fiber saturation point, hydroxyl site content, and the amount of micropores as determined from NMR relaxation time distributions

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Published/Copyright: September 21, 2012
Holzforschung
From the journal Holzforschung Volume 67 Issue 3

Abstract

Distributions of nuclear magnetic resonance (NMR) relaxation times provide detailed information about the moisture absorbed in wood. In this work, T2*, T2, and T1 distributions were recorded from fresh sapwood and heartwood samples of pine (Pinus sylvestris) and spruce (Picea abies) at various temperatures. Below the melting point of bulk water, free water is frozen and its signal disappears from the distributions. Then, the low-temperature distributions of the unfrozen bound water contain more information about its components, because the large free water peaks hiding some smaller bound water peaks are absent and the exchange between free and bound water is prevented. Comparison of the total moisture signal integrals above and below the bulk melting point enables the determination of fiber saturation point (FSP), which, in this context, denotes the total water capacity of cell wall. T2*, T2, and T1 distributions offer different kinds of information about moisture components. All the peaks in the distributions were assigned, and it was demonstrated that the accessible hydroxyl site content and the amount of micropores can be estimated based on the peak integrals.

Keywords: bound water; fiber saturation point (FSP); free water; micropore; moisture content (MC); nuclear magnetic resonance (NMR); Picea abies; Pinus sylvestris; water in wood
Corresponding author: Ville-Veikko Telkki, NMR Research Group, Department of Physics, University of Oulu, P.O. Box 3000, FI-90014 Oulu, Finland, Phone: +358-8-5531309
Received: 2012-4-3
Accepted: 2012-8-21
Published Online: 2012-09-21
Published in Print: 2013-04-01

©2013 by Walter de Gruyter Berlin Boston

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  1. Masthead
  2. Masthead
  3. Publisher’s Note
  4. Publisher’s Note
  5. Original Articles
  6. Effects of water in water/phenol mixtures on liquefaction of Japanese beech as treated under subcritical conditions
  7. Multistep degradation method for β-O-4 linkage in lignins: γ-TTSA method. Part 2: reaction of lignin model polymer (DHP)
  8. Antioxidant property of TCF pulp with a high hexenuronic acid (HexA) content
  9. Determination of absolute molecular weight of sodium lignosulfonates (NaLS) by laser light scattering (LLS)
  10. Effect of grinding conditions in oscillatory ball milling on the morphology of particles and cellulose crystallinity of Norway spruce (Picea abies)
  11. Rapid microwave-assisted acid extraction of southern pine waste wood to remove metals from chromated copper arsenate (CCA) treatment
  12. Moisture in softwoods: fiber saturation point, hydroxyl site content, and the amount of micropores as determined from NMR relaxation time distributions
  13. Experimental and numerical analysis of the sound insulation property of wood plastic composites (WPCs) filled with precipitated CaCO3
  14. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC)
  15. Micromechanical detection of growth stress in wood cell wall by wide-angle X-ray diffraction (WAX)
  16. The influence of hot-press temperature and cooling rate on thermal and physicomechanical properties of bamboo particle-polylactic acid composites
  17. Semi-analytical prediction and experimental evaluation of material damping in wood panels
  18. Composition and antifungal activity of balsam from Liquidambar formosana Hance
  19. Short Note
  20. Inverse gas chromatography and XPS of extracted kraft pulps
  21. Book review
  22. Nanocellulose: From Nature to High Performance Tailored Material
  23. Meetings
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https://doi.org/10.1515/hf-2012-0057
Keywords for this article
bound water; fiber saturation point (FSP); free water; micropore; moisture content (MC); nuclear magnetic resonance (NMR); Picea abies; Pinus sylvestris; water in wood

Articles in the same Issue

  1. Masthead
  2. Masthead
  3. Publisher’s Note
  4. Publisher’s Note
  5. Original Articles
  6. Effects of water in water/phenol mixtures on liquefaction of Japanese beech as treated under subcritical conditions
  7. Multistep degradation method for β-O-4 linkage in lignins: γ-TTSA method. Part 2: reaction of lignin model polymer (DHP)
  8. Antioxidant property of TCF pulp with a high hexenuronic acid (HexA) content
  9. Determination of absolute molecular weight of sodium lignosulfonates (NaLS) by laser light scattering (LLS)
  10. Effect of grinding conditions in oscillatory ball milling on the morphology of particles and cellulose crystallinity of Norway spruce (Picea abies)
  11. Rapid microwave-assisted acid extraction of southern pine waste wood to remove metals from chromated copper arsenate (CCA) treatment
  12. Moisture in softwoods: fiber saturation point, hydroxyl site content, and the amount of micropores as determined from NMR relaxation time distributions
  13. Experimental and numerical analysis of the sound insulation property of wood plastic composites (WPCs) filled with precipitated CaCO3
  14. Applicability of Vis-NIR hyperspectral imaging for monitoring wood moisture content (MC)
  15. Micromechanical detection of growth stress in wood cell wall by wide-angle X-ray diffraction (WAX)
  16. The influence of hot-press temperature and cooling rate on thermal and physicomechanical properties of bamboo particle-polylactic acid composites
  17. Semi-analytical prediction and experimental evaluation of material damping in wood panels
  18. Composition and antifungal activity of balsam from Liquidambar formosana Hance
  19. Short Note
  20. Inverse gas chromatography and XPS of extracted kraft pulps
  21. Book review
  22. Nanocellulose: From Nature to High Performance Tailored Material
  23. Meetings
  24. Meetings
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