核磁共振弛豫仪揭示的硬木微观结构中水的渗透

IF 3.1 2区 农林科学 Q1 FORESTRY
Luoyi Yan, Elisa Julien, Benjamin Maillet, Rahima Sidi-Boulenouar, Philippe Coussot
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引用次数: 0

摘要

用核磁共振跟踪了立方硬木(橡木和杨木)样品的微观结构中水的吸积,样品表面要么对空气开放,要么涂上油漆,沿着不同的木材方向。动态核磁共振弛豫测量可以清楚地区分和量化随着时间的推移,纤维、血管或结合水中出现的水量。在木样中,水首先以结合水的形式渗透。随后,纤维以较慢的速度浸润,其次是血管,其浸润速度最慢。对杨树来说,血管甚至只有在纤维全部被填满后才开始被侵入。此外,当木材样品的所有开放面都涂上油漆时,不同相的入侵动力学在质量上是相似的,防止这些面吸入任何空气。简单的毛细管吸胀模型不能完全描述这些过程,表明润湿特性的变化取决于细胞壁中结合水的存在,随后取决于纤维中水的存在。最后,考虑到结合水先于自由水渗透,可以通过不同方向(L, R, T)的数据估计结合水的扩散系数,从而表征吸湿条件下建筑材料与周围空气之间的水分交换。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Water penetration in the microstructure of hardwood revealed by NMR relaxometry

The imbibition of water in the microstructure of cubic hardwood (oak and poplar) samples was followed by NMR, with sample faces either open to air or coated with paint, and along the different wood directions. Dynamic NMR relaxometry allows to clearly distinguish and quantify the amount of water appearing in fibers, in vessels, or as bound water, over time. It appears that the water penetrates first in the form of bound water in the wood sample. Subsequently, fibers are infiltrated at a slower rate, followed by vessels, which exhibit the slowest rate of invasion. For poplar, vessels even start to be invaded only after all the fibers have been filled. Furthermore, the invasion dynamics of the different phases are qualitatively similar when all open faces of the wood sample are coated with paint, preventing any air extraction by these faces. A simple capillary imbibition model fails to fully describe these processes, indicating that the wetting properties vary depending on the presence of bound water in the cell walls, and subsequently, on the presence of water in fibers. Finally, given that bound water penetrates prior to free water, the diffusion coefficient of bound water can be estimated from the data across different directions (L, R, T), which enables the characterization of moisture exchange between construction materials and ambient air under hygroscopic conditions.

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来源期刊
Wood Science and Technology
Wood Science and Technology 工程技术-材料科学:纸与木材
CiteScore
5.90
自引率
5.90%
发文量
75
审稿时长
3 months
期刊介绍: Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.
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