副晶态
微纤维
材料科学
散射
表征(材料科学)
纤维素
小角X射线散射
水分
小角中子散射
原子堆积因子
复合材料
纤维素乙醇
中子散射
化学工程
结晶学
纳米技术
化学
光学
物理
工程类
作者
Paavo A. Penttilä,Lauri Rautkari,Monika Österberg,Ralf Schweins
标识
DOI:10.1107/s1600576719002012
摘要
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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