Absolute Moisture Content Determination of Aspen Wood Below the Fiber Saturation Point using Pulsed NMR

Hartley, Ian D.; Kamke, Frederick A.; Peemoeller, H.

doi:10.1515/hfsg.1994.48.6.474

Cited by 62 publications

(42 citation statements)

References 8 publications

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“…1994 a ; , horse chestnut bark and bast or wood (Hartley, Kamke & Peemoeller, 1994) and the solid matrix of mollusc shell (Haran! czyk, Nizoł & Falniowski, 1994b, Haran!…”

Section: Nmr Measurementmentioning

confidence: 99%

Initial stages of lichen hydration observed by proton magnetic relaxation

1998

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The hydration of selected lichens (Cladonia mitis, Cladonia bellidiflora, Cetraria islandica, Parmelia saxatilis, and Xanthoria parietina) was investigated using gravimetry and proton magnetic free induction decays (FIDs).The hydration from gaseous phase and dehydration to gaseous phase showed first-order kinetics. The amount of water which was non-removable in the air-dry state (relative humidity p\p ! l 9 %) did not depend significantly on the lichen species and was found to be 5n6p1n0 % of the d. wt.The proton FID Gaussian component from the solid matrix of thallus structure, and two (or, depending on lichen species, one averaged) liquid signals coming from water tightly bound on the surface of thallus solid matrix and from loosely bound or free water, were recorded. The bound-water component was distinguished by its motional properties and by its proximity to endogenous paramagnetic centres present in solid matrix (presumably PS II reaction centres of the photobiont). Mild dehydration (from gaseous phase) could completely remove the loosely bound water fraction, leaving the system below the water percolation threshold and below the water clustering point, emphasizing the passivity of lichen response to desiccation shock. In the species in which the one average liquid component was recorded, bound water behaved similarly.The hydration at which free water pool vanishes (∆M\m ! ) and the relative (scaled to water) proton densities of solid matrix of lichen (β) were evaluated for all lichens investigated.

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“…1994 a ; , horse chestnut bark and bast or wood (Hartley, Kamke & Peemoeller, 1994) and the solid matrix of mollusc shell (Haran! czyk, Nizoł & Falniowski, 1994b, Haran!…”

Section: Nmr Measurementmentioning

confidence: 99%

Initial stages of lichen hydration observed by proton magnetic relaxation

1998

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“…The solid line was calculated from Eq. [4] with fitted parameters S averaged over time windows along the FID are (89 { 5), (4.5 { 0.5), and (0.88 { 0.09) ms ( Table 2). The negative fractions seen in the reconstructed FIDs (Fig.…”

Section: Figmentioning

confidence: 99%

“…To obtain intrinsic values of the relaxation times and mag-tive abundances of the protons in OH, CH 3 , and other (primarily CH 2 and CH) groups for different wood components, netization fractions as well as the exchange rates, the relaxation data from the SH T 1 , HH T 1 , T 1r (10 G), and T 1r (2 as well as average abundances of these components in aspen wood (4). The fraction of wood protons on the OH groups G) were simultaneously fitted to a linear three-site exchange model, using the approach presented under Exchange Analy-in aspen is 27.3%.…”

Section: Figmentioning

confidence: 99%

“…Nuclear magnetic resonance has been used to investigate different aspects NMR techniques, it is possible to study the intrinsic relaxation rates of the protons of various spin groups (of water of wood-water interactions. For example, methods for determining the MC of wood were developed, using wide-and the solid components), and then elucidate details about the spin-group environments as well as exchange between line NMR spectra (1) and pulse NMR techniques (2)(3)(4). Relationships between the water content and the relaxation them.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Spin–Spin Coupling in Wood by 2D Time-Domain NMR

Oleskevich

Ghahramany

Węglarz

et al. 1996

Journal of Magnetic Resonance, Series B

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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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Absolute Moisture Content Determination of Aspen Wood Below the Fiber Saturation Point using Pulsed NMR

Cited by 62 publications

References 8 publications

Initial stages of lichen hydration observed by proton magnetic relaxation

Initial stages of lichen hydration observed by proton magnetic relaxation

Interfacial Spin–Spin Coupling in Wood by 2D Time-Domain NMR

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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