文献类型：期刊文献

英文题名：Mechanism of wood deformation cascading from nanoscale to macroscale in response to moisture desorption

作者：Gao, Yufa[1,2,3] Fu, Zongying[1,2] Fu, Feng[1,2] Zhou, Yongdong[1,2] Gao, Xin[1,2] Zhou, Fan[1,2]

第一作者：Gao, Yufa

通信作者：Zhou, YD[1];Zhou, YD[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Key Lab Wood Sci & Technol Natl Forestry Grassland, Beijing 100091, Peoples R China;[3]Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Syst Integrat Engeering Ctr, CAS Key Lab Biofuels, Qingdao 266101, Peoples R China

年份：2024

卷号：31

期号：11

起止页码：6581-6595

外文期刊名：CELLULOSE

收录：;EI(收录号：20242616425016);Scopus(收录号：2-s2.0-85196788220);WOS:【SCI-EXPANDED(收录号:WOS:001254155500002)】；

基金：This work was supported by the Fundamental Research Funds of Chinese Academy of Forestry (Grant no. CAFYBB2020ZA003), and National Natural Science Foundation of China (Grant no. 31890772).

语种：英文

外文关键词：Wood cells; Dimension change; Multi-scale; Moisture desorption

摘要：Water interactions with cellulose, hemicellulose, and lignin in cell walls significantly influence their dimensional properties and thus the many applications of wood and other cellulosic materials. The sustainable development and application of wood and cellulosic materials require a better understanding of the mechanisms involved in the deformation with moisture changes. The dimensional changes of multiscale structures of Masson pine were studied during moisture desorption, and the differences at different scales were compared. The confocal laser scanning microscopy (CLSM) was used to observe the deformation of cells. The detail of wood nanostructure was characterized by small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS). The molecular interaction between moisture and cell wall was studied using Fourier-transform infrared (FTIR). The results revealed that weakly hydrogen-bonded water molecules and water molecule clusters desorbed from the wood cell walls during moisture loss. The loss of water molecules altered the wood nanostructure, resulting in 12% and 7% reductions in the distances between the elementary fibrils in the latewood (LW) and earlywood (EW) cell walls, respectively. The dimensions of the cellulose crystallites in LW and EW decreased by 5% and 2%, respectively. At the cellular level, the tangential shrinkage of LW and EW were 9% and 6%, respectively. The reduction of the shrinkage at the larger scale can be attributed to the mutual inhibition and fine-tuning of the multi-scale hierarchical structures in wood. These findings provide insight into the instability of wood or natural cellulosic materials during moisture desorption and contribute to developing of more targeted wood-based materials.