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
- 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)
- 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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1777afbe-0e2a-4903-a44c-a087af75ad14
- author
- Fredriksson, Maria
LU
and Thygesen, Lisbeth Garbrecht
- organization
- publishing date
- 2017-01-01
- 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
- 2022-03-24 01:50:09
@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}},
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)}},
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}},
doi = {{10.1515/hf-2016-0044}},
volume = {{71}},
year = {{2017}},
}