Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 52, Issue -, Pages 369-377Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600576719002012
Keywords
small-angle scattering; wood; cellulose; structural characterization; moisture behaviour
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Funding
- Emil Aaltosen Saatio
- Agence Nationale de la Recherche [ANR-11-EQPX-0010]
- US National Science Foundation [DMR-0520547]
- EU Horizon 2020 [654000]
- Agence Nationale de la Recherche (ANR) [ANR-11-EQPX-0010] Funding Source: Agence Nationale de la Recherche (ANR)
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Small-angle scattering methods allow an efficient characterization of the hierarchical structure of wood and other cellulosic materials. However, their full utilization would require an analytical model to fit the experimental data. This contribution presents a small-angle scattering model tailored to the analysis of wood samples. The model is based on infinitely long cylinders packed in a hexagonal array with paracrystalline distortion, adapted to the particular purpose of modelling the packing of cellulose microfibrils in the secondary cell wall of wood. The new model has been validated with small-angle neutron and X-ray scattering data from real wood samples at various moisture contents. The model yields reasonable numerical values for the microfibril diameter (2.1-2.5 nm) and packing distance (4 and 3 nm in wet and dry states, respectively) and comparable results between the two methods. It is particularly applicable to wet wood samples and allows changes in the packing of cellulose microfibrils to be followed as a function of moisture content.
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