NMR detection of liquid-like wood polymer component in dry aspen wood

Peemoeller, H.; Węglarz, Władysław P.; Hinek, M.J.; Holly, R.; Lemaire, Claude; Teymoori, Roshanak; Liang, Jianzhen; Crone, Joshua C.; Mansour, F.; Hartley, Ian D.

doi:10.1016/j.polymer.2012.12.081

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…(30). The S 0 lineshape is approximately Gaussian, due to the large, rigid spin system of wood constituents including cellulose, xylan, and lignin [47]. Of these, cellulose makes up about half the mass of wood.…”

Section: Dipolar Order Of Homogeneously-broadened Spin Systemsmentioning

confidence: 99%

The physical mechanism of “inhomogeneous” magnetization transfer MRI

Manning

Chang

MacKay

et al. 2017

Journal of Magnetic Resonance

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Section: Dipolar Order Of Homogeneously-broadened Spin Systemsmentioning

confidence: 99%

The physical mechanism of “inhomogeneous” magnetization transfer MRI

Manning

Chang

MacKay

et al. 2017

Journal of Magnetic Resonance

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“…This suggests the presence of a component in teak which is not influenced by the water content. It can be lowmolecular-weight organic compounds known as extractives (Siau 1984;Peemoeller et al 2013;Labbé et al 2002).…”

Section: Teakmentioning

confidence: 99%

Bound and free water distribution in wood during water uptake and drying as measured by 1D magnetic resonance imaging

et al. 2016

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Knowledge on moisture transport in wood is important for understanding its utilization, durability and product quality. Moisture transport processes in wood can be studied by Nuclear Magnetic Resonance (NMR) imaging. By combining NMR imaging with relaxometry, the state of water within wood can be identified, i.e. water bound to the cell wall, and free water in the cell lumen/vessel. This paper presents how the transport of water can be monitored and quantified in terms of bound and free water during water uptake and drying. Three types of wood from softwood to hardwood were selected covering a range of low to high density wood; pine sapwood and oak and teak. A calibration is performed to determine the different water states in each different wood type and to convert the NMR signal into moisture content. For all wood types, water transport appeared to be internally limited during both uptake and drying. In case of water uptake, free water was observed only after the cell walls were saturated with bound water. In case of drying, the loss of bound water starts only after vanishing of free water, irrespective of the position. Obviously, there is always a local thermodynamic equilibrium of bound and free water for both uptake and drying. Finally, we determined the effective diffusion coefficient (D eff ). Experimentally determined diffusion constants were compared with those derived by the diffusion models for conceptual understanding of transport mechanism. We found that diffusion in the cell wall fibers plays a critical role in the transport process.

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“…Regions of 13 C NMR spectra: 1-aliphatic region; 2-olefinic region, aromatic, 3-carbonyl and acyclic region. (PEEMOELLER et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

“…Deslocamentos químicos dos espectros dos extratos cicloexânicos da região do cerne específicos do gênero Eucalyptus e da espécie Corymbia citriodora.Table 2. Chemical shifts of the spectra of the cyclohexane extracts from the heartwood region of the genus Eucalyptus and the species Corymbia citriodora SOUZA et al, 2011;WANG;LIU, 2012;PEEMOELLER et al, 2013…”

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Uso de RMN de 13C para identificação da madeira de Corymbia citriodora

Neves

Pinto

Cupertino

et al. 2019

RCM

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RESUMO A classificação do gênero Eucalyptus é relativamente complexa, visto que as espécies desse gênero apresentam características anatômicas e morfológicas muito parecidas, trazendo muitas vezes dúvidas sobre a sua origem botânica. Estudos baseados em características morfológicas e moleculares levaram a uma nova reclassificação do gênero Eucalyptus, onde algumas espécies foram excluídas, e passaram a pertencer a um novo gênero, o Corymbia. A utilização da Ressonância Magnética Nuclear de 13 Carbono (RMN de 13 C), tem sido testada como uma nova ferramenta para contribuir com a identificação de madeiras. Diante disso, este trabalho teve como objetivo identificar a espécie de Corymbia citriodora usando-se da técnica de RMN de 13 C, com base nas variações espectrais dos extrativos da região do cerne do lenho. Sinais característicos e específicos foram encontrados para a espécie Corymbia citriodora e nenhum sinal característico foi detectado para o gênero Eucalyptus. A RMN de 13 C poderá constituir uma ferramenta auxiliar para os métodos de identificação de madeiras, tendo em vista que foram encontrados sinais característicos específicos para a espécie Corymbia citriodora. Palavras-chave: Identificação de madeiras; gênero Eucalyptus; extrativos da madeira. 13 C NMR use for species identification of Corymbia citriodora wood ABSTRACT The classification of the Eucalyptus genus is relatively complex, since the species of these genus present very similar anatomical and morphological characteristics, often causing doubts about its botanical origin. Studies based on morphological and molecular characteristics have resulted in a new reclassification of the genus Eucalyptus and some species were excluded, to form a new genus, Corymbia. The use of 13 Carbon Nuclear Magnetic Resonance (13 C NMR) has been tested as a new tool to contribute to the identification of wood. The aim of this work was to identify the species of Corymbia citriodora through the 13 C NMR technique, based on the spectral variations. Characteristic and specific signals were found for the species Corymbia citriodora and no characteristic signal was detected for the genus Eucalyptus. 13 C NMR may be an auxiliary tool for wood identification methods, since specific characteristic signals have been found for the Corymbia citriodora specie.

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NMR detection of liquid-like wood polymer component in dry aspen wood

Cited by 7 publications

References 11 publications

The physical mechanism of “inhomogeneous” magnetization transfer MRI

The physical mechanism of “inhomogeneous” magnetization transfer MRI

Bound and free water distribution in wood during water uptake and drying as measured by 1D magnetic resonance imaging

Uso de RMN de 13C para identificação da madeira de Corymbia citriodora

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