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The states of water in Norway spruce (Picea abies (L.) Karst.) studied by low-field nuclear magnetic resonance (LFNMR) relaxometry : Assignment of free-water populations based on quantitative wood anatomy

Fredriksson, Maria LU and Thygesen, Lisbeth Garbrecht (2017) In Holzforschung 71(1). p.77-90
Abstract (Swedish)
LFNMR relaxometry was applied to determine the spin-spin relaxation time (T2) of water saturated Norway spruce samples cut from mature sapwood and mature and juvenile heartwood where earlywood and latewood were separated. In combination with quantitative wood anatomy data focusing on the void volumes in various morphological regions, the NMR data served for a more reliable assignment of free water populations found in water-saturated solid wood. Two free water populations were identified within most sample types. One was assigned to water in the tracheid lumen and the other to water inside bordered pits. Whether water in the ray cell lumina was included in one or the other of these two populations depends on the curve-fit method applied... (More)
LFNMR relaxometry was applied to determine the spin-spin relaxation time (T2) of water saturated Norway spruce samples cut from mature sapwood and mature and juvenile heartwood where earlywood and latewood were separated. In combination with quantitative wood anatomy data focusing on the void volumes in various morphological regions, the NMR data served for a more reliable assignment of free water populations found in water-saturated solid wood. Two free water populations were identified within most sample types. One was assigned to water in the tracheid lumen and the other to water inside bordered pits. Whether water in the ray cell lumina was included in one or the other of these two populations depends on the curve-fit method applied (continuous or discrete). In addition, T2 differences between the different tissue types were studied and, for comparison, sorption isotherms were measured by means of a sorption balance. There was a significant difference between earlywood and latewood as well as between juvenile wood and mature wood in terms of T2 related to the cell wall water. However, no differences were seen between the sorption isotherms, which indicate that the observed T2 differences were not due to differences in cell wall moisture content. (Less)
Abstract
Low-field nuclear magnetic resonance (LFNMR) relaxometry was applied to determine the spin-spin relaxation time (T2) of water-saturated Norway spruce (Picea abies (L.) Karst.) specimens cut from mature sapwood (sW) and mature and juvenile heartwood (hW), where earlywood (EW) and latewood (LW) were separated. In combination with quantitative wood anatomy data focusing on the void volumes in various morphological regions, the NMR data served for a more reliable assignment of free-water populations found in water-saturated solid wood. Two free-water populations were identified within most sample types. One was assigned to water in the tracheid lumen and the other to water inside bordered pits. Whether water in the ray cell lumina was included... (More)
Low-field nuclear magnetic resonance (LFNMR) relaxometry was applied to determine the spin-spin relaxation time (T2) of water-saturated Norway spruce (Picea abies (L.) Karst.) specimens cut from mature sapwood (sW) and mature and juvenile heartwood (hW), where earlywood (EW) and latewood (LW) were separated. In combination with quantitative wood anatomy data focusing on the void volumes in various morphological regions, the NMR data served for a more reliable assignment of free-water populations found in water-saturated solid wood. Two free-water populations were identified within most sample types. One was assigned to water in the tracheid lumen and the other to water inside bordered pits. Whether water in the ray cell lumina was included in one or the other of these two populations depends on the curve-fit method applied (continuous or discrete). In addition, T2 differences between the different tissue types were studied and, for comparison, sorption isotherms were measured by means of a sorption balance. There was a significant difference between EW and LW as well as between juvenile wood and mature wood in terms of T2 related to the cell wall water. However, no differences were seen between the sorption isotherms, which indicates that the observed T2 differences were not due to differences in cell wall moisture content (MC). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dynamic vapour sorption (DVS), earlywood (EW), juvenile wood, latewood (LW), low-field nuclear magnetic resonance (LFNMR), moisture content (MC), sorption isotherm, spin-spin relaxation time (T)
in
Holzforschung
volume
71
issue
1
pages
14 pages
publisher
De Gruyter
external identifiers
  • scopus:85008622398
  • wos:000391191600010
ISSN
0018-3830
DOI
10.1515/hf-2016-0044
language
English
LU publication?
yes
id
1777afbe-0e2a-4903-a44c-a087af75ad14
date added to LUP
2016-10-04 14:25:34
date last changed
2018-10-14 04:33:02
@article{1777afbe-0e2a-4903-a44c-a087af75ad14,
  abstract     = {Low-field nuclear magnetic resonance (LFNMR) relaxometry was applied to determine the spin-spin relaxation time (T2) of water-saturated Norway spruce (Picea abies (L.) Karst.) specimens cut from mature sapwood (sW) and mature and juvenile heartwood (hW), where earlywood (EW) and latewood (LW) were separated. In combination with quantitative wood anatomy data focusing on the void volumes in various morphological regions, the NMR data served for a more reliable assignment of free-water populations found in water-saturated solid wood. Two free-water populations were identified within most sample types. One was assigned to water in the tracheid lumen and the other to water inside bordered pits. Whether water in the ray cell lumina was included in one or the other of these two populations depends on the curve-fit method applied (continuous or discrete). In addition, T2 differences between the different tissue types were studied and, for comparison, sorption isotherms were measured by means of a sorption balance. There was a significant difference between EW and LW as well as between juvenile wood and mature wood in terms of T2 related to the cell wall water. However, no differences were seen between the sorption isotherms, which indicates that the observed T2 differences were not due to differences in cell wall moisture content (MC).},
  author       = {Fredriksson, Maria and Thygesen, Lisbeth Garbrecht},
  issn         = {0018-3830},
  keyword      = {dynamic vapour sorption (DVS),earlywood (EW),juvenile wood,latewood (LW),low-field nuclear magnetic resonance (LFNMR),moisture content (MC),sorption isotherm,spin-spin relaxation time (T)},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {77--90},
  publisher    = {De Gruyter},
  series       = {Holzforschung},
  title        = {The states of water in Norway spruce (Picea abies (L.) Karst.) studied by low-field nuclear magnetic resonance (LFNMR) relaxometry : Assignment of free-water populations based on quantitative wood anatomy},
  url          = {http://dx.doi.org/10.1515/hf-2016-0044},
  volume       = {71},
  year         = {2017},
}