Small-angle scattering model for efficient characterization of wood nanostructure and moisture behaviour

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2019-03-26
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
369-377
Series
Journal of Applied Crystallography, Volume 52, issue 2
Abstract
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.
Description
Keywords
cellulose, moisture behaviour, small-angle scattering, structural characterization, wood
Other note
Citation
Penttilä, P A, Rautkari, L, Österberg, M & Schweins, R 2019, ' Small-angle scattering model for efficient characterization of wood nanostructure and moisture behaviour ', Journal of Applied Crystallography, vol. 52, no. 2, pp. 369-377 . https://doi.org/10.1107/S1600576719002012