文献类型：期刊文献

英文题名：Radial variation in the sorption behavior of water-saturated bamboo with graded fibrous structure

作者：Li, Zhu[1] Xiang, Elin[1] Yang, Chen[1] Huang, He[1] Jiang, Jiali[1] Lyu, Jianxiong[1]

第一作者：李珠

通信作者：Jiang, JL[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2025

卷号：494

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20253519054042);Scopus(收录号：2-s2.0-105013969011);WOS:【SCI-EXPANDED(收录号:WOS:001561748600001)】；

基金：This work was financially supported by the National Key Research and Development Program of China (2023YFD2200501) .

语种：英文

外文关键词：Bamboo; Gradient structure; Fibers; Parenchyma cells; Free water; Hygroscopicity

摘要：Bamboo is a structural gradient material with inherent hygroscopicity. Understanding the radial variations in sorption behavior of bamboo culm wall are crucial for elucidating bamboo-water interactions and optimizing the drying and utilization of bamboo. In this study, a dynamic vapor sorption apparatus was conducted to analyze water-saturated bamboo slices obtained from different radial positions within the culm wall of Moso bamboo (Phyllostachys edulis) and its fibers and parenchyma cells. The equilibrium moisture content (EMC) of all watersaturated bamboo specimens varied from 37.50 % to 207.55 %, with an average EMC of the intact bamboo culm wall at 82.50 %. When bamboo specimens with free water desorbed, the loss of adsorbed water at surface layer and free water inside took place simultaneously in the relative humidity range above 80 %. This phenomenon of retained free water was particularly pronounced in bamboo slices compared to fibers and parenchyma cells. Similar sorption properties of slices were noted in the inner half of bamboo culm wall, with the exception of pith ring, while a strong linear inverse relationship was observed between EMC and fiber bundle fraction in the outer half. The experimental sorption data of all bamboo specimens were well described by the Hailwood-Horrobin model with an R2 above 99.85 %. Comparison with fibers and parenchyma cells, monolayer molecules water in bamboo slices were relatively lower, while polylayer molecules water showed the a contrary tendency, indicating that bamboo slices with porous structure exhibited less hygroscopic at low humidity and more easily to accommodate water clusters at higher humidity.