A NMR study of water distribution in hardwoods at several equilibrium moisture contents

Almeida, Giana; Gagné, Stéphane M.; Hernández, Roger E.

doi:10.1007/s00226-006-0116-3

Cited by 112 publications

(79 citation statements)

References 16 publications

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“…This conclusion coincides with previous research by Almeida et al (2007) and Rozas et al (2009), who claim that a region can exist in drying wood where the loss of bound water occurs when liquid (free) water is still available.…”

Section: Discussionsupporting

confidence: 92%

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

et al. 2013

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This article reports the results of temperature measurements carried out on 50-mm-thick Norway spruce (Picea abies [L.] Karst) wood samples exposed to infrared (IR) radiation. The varied property with respect to the optimization of the drying technology was the initial moisture content of samples. During the experiments, temperature profiles were registered on the surface and in the core of the samples under controlled technological conditions. Based on our osmotic approach, the variability in the curves was interpreted with respect to the stagnation temperature below the fiber saturation point (FSP). We conclude that the amount of liquid water necessary for osmosis must still be available locally in the core. With decreasing initial average moisture content, the time interval of the osmotic process also decreases. In this context our results support the hypothesis that the presence of free water in the wood tissue is necessary for the osmotic mechanism even if the average moisture content falls below the FSP.

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Section: Discussionsupporting

confidence: 92%

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

et al. 2013

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“…This component had lower amplitude than the fast 265 T 2 component in the heartwood and is assigned to the liquid water in the cells of the 266 heartwood. A slow, greater than 100 ms, T 2 component value usually assigned to 267 water in the vessel elements is reported in previous work [18,37,38]. This was seen 268 in the sapwood region with a T 2 of around 111 ms.…”

mentioning

confidence: 66%

A transportable magnetic resonance imaging system for in situ measurements of living trees: The Tree Hugger

Jones

Aptaker

Cox

et al. 2012

Journal of Magnetic Resonance

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“…Low-field nuclear magnetic resonance (LFNMR) has previously been used to study water in wood, both to determine MC (Sharp et al 1978;Hartley et al 1994Hartley et al , 1996Merela et al 2009) and to differentiate between different water states or populations (Menon et al 1987(Menon et al , 1989Flibotte et al 1990;Araujo et al 1992Araujo et al , 1994Labbé et al 2002Labbé et al , 2006Almeida et al 2007;Elder 2008, 2009). The LFNMR approach is decribed by Rutledge (1992).…”

Section: Introductionmentioning

confidence: 99%

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

Thygesen

2016

Holzforschung

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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 DOI 10.1515/hf-2016-0044 Received February 23, 2016 accepted August 15, 2016; previously published online September 22, 2016 Abstract: Low-field nuclear magnetic resonance (LFNMR) relaxometry was applied to determine the spin-spin relaxation time (T 2 ) 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, T 2 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 T 2 related to the cell wall water. However, no differences were seen between the sorption isotherms, which indicates that the observed T 2 differences were not due to differences in cell wall moisture content (MC).

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A NMR study of water distribution in hardwoods at several equilibrium moisture contents

Cited by 112 publications

References 16 publications

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

Impact of Initial Moisture Content on the Drying Process of Wood Exposed to Infrared Radiation

A transportable magnetic resonance imaging system for in situ measurements of living trees: The Tree Hugger

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

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