Research progress on the effect of water on pore structure of wood cell wall
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摘要:
木材是一种具有多级孔隙结构的天然可再生资源，其孔隙构造尤其是细胞壁孔隙结构至关重要。细胞壁孔隙结构的研究是木材加工的理论基础，对于提高木材综合利用率具有重要的现实意义。本文简要介绍了木材孔隙的种类及其表征技术，在此基础上梳理了水分对木材细胞壁孔隙结构影响的相关研究成果，总结了目前由水分引发的木材细胞壁孔隙结构变化领域仍存在的一些问题与挑战，对未来的发展方向及其前景进行展望，以期为深入揭示木材与水分的相互作用提供参考。
Abstract:Wood is a kind of natural renewable resource with multi-pore structure. Its pore structure, especially the cell wall pore structure, is highly important, which is a fundamental scientific issue in wood processing, with practical significance for improving the comprehensive utilization rate of wood. In this paper, the types of pores in wood and their characterization techniques were briefly introduced. On this basis, research progress concerning the effect of water on the pore structure of wood cell wall was reviewed. Existing problems and challenges in the field of pore structure changes of wood cell wall induced by water were summarized, and the future work and prospects were prospected, with the wish of providing new insights and deep understanding for revealing the interaction between wood and water.
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Keywords:
- wood pore /
- cell wall /
- wood water /
- pore structure /
- pore characterization
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表 1 木材中介观空隙的直径大小
Table 1 Diameter size of mesoscopic voids in wood
空隙种类 Type of void 直径 Diameter/nm 具缘纹孔塞缘小孔（针叶材） Small pores in the margo of bordered pit (softwood) 20 ~ 8 000 单纹孔纹孔膜小孔（针叶材） Small pores in the membrane of single pit (softwood) 50 ~ 300 细胞壁中空隙（干燥状态） Voids in the cell wall (dry state) 2 ~ 10 细胞壁中空隙（湿润状态） Voids in the cell wall (wet state) 1 ~ 10 微纤丝间隙（润胀状态） Microfibril gaps (swollen state) 2.0 ~ 4.5 注：引自文献[3]。Note: cited from reference [3]. 
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表 2 不同孔隙表征方法的适测孔径范围
Table 2 Range of suitable pore sizes for different pore characterisation methods
项目
Item压汞法
Mercury intrusion porosimetry气体吸附法
Gas adsorption isotherms溶质排斥法
Solute exclusion差示扫描热孔计法
Differential scanning calorimetry thermoporosimetry核磁共振冷孔计法
Nuclear magnetic resonance cryoporometry孔径范围
Pore diameter range/nm50 ~ 5 000 0.3 ~ 300.0 0.8 ~ 586.0 3.9 ~ 582.0 2.6 ~ 396.0 注：引自文献[5]。Note: cited from reference [5].
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