利用核磁共振测定木材吸着水饱和含量

高鑫; 庄寿增*

doi:10.11938/cjmr20150412

波谱学杂志 >

2015 , Vol. 32 >Issue 4: 670 - 677

DOI: https://doi.org/10.11938/cjmr20150412

低场磁共振技术与应用专栏

利用核磁共振测定木材吸着水饱和含量

高鑫 ,
庄寿增*

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南京林业大学材料科学与工程学院，江苏南京 210037

高鑫(1986-)，男，江苏徐州人，博士研究生，木材科学与技术专业． *通讯联系人：庄寿增，电话： 025-85427058， E-mail： szzhuang@njfu.edu.cn.

收稿日期: 2015-04-20

修回日期: 2015-10-22

网络出版日期: 2015-12-05

基金资助

国家自然科学基金资助项目(30771677)，江苏省研究生培养创新工程资助项目(CXZZ13_0543)

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Bound Water Content in Saturated Wood Cell Wall Determined by Nuclear Magnetic Resonance Spectroscopy

GAO Xin ,
ZHUANG Shou-zeng*

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College of Material Science and Engineering, Nanjing Forestry University, Nanjing 210037, China

*Corresponding author： ZHUANG Shou-zeng, Tel: +86-25-85427058, E-mail: szzhuang@njfu.edu.cn.

Received date: 2015-04-20

Revised date: 2015-10-22

Online published: 2015-12-05

Supported by

国家自然科学基金资助项目(30771677)，江苏省研究生培养创新工程资助项目(CXZZ13_0543)

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摘要

利用核磁共振(NMR)技术研究了室温与-3 ℃ 条件下 5 种树种木材内水分质子的自旋-自旋弛豫时间(T₂)特性，室温下各树种木材试样 T₂ 弛豫时间特性的不同是由木材微观构造导致的．通过对比冷冻前后各树种试样的信号反演峰面积，确定了其吸着水饱和含量，樟子松 38.3%，杉木 38.5%，杨木 36.0%，白蜡木 35.6%，轻木 47.6%，均高于通过吸湿外推法估算数值，与溶剂排出法、多孔板法、离心法等实测法获得的吸着水饱和含量的结果相近，核磁共振技术可作为木材内吸着水含量快速测定的实验方法．

关键词： 核磁共振(NMR); 吸着水含量; 自旋-自旋弛豫时间(T₂); 木材; 细胞壁饱和润胀

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高鑫 , 庄寿增* . 利用核磁共振测定木材吸着水饱和含量
[J]. 波谱学杂志, 2015 , 32(4) : 670 -677 . DOI: 10.11938/cjmr20150412

Abstract

¹H spin-spin relaxation time (T₂) of water in 5 species of wood was measured by nuclear magnetic resonance (NMR) spectroscopy at room temperature and -3℃, which is thought to be related to the anatomical structure of the wood. The bound water content within swollen cell wall was determined by comparison of the inversion peak area before and after frozen treatment: Pinus sylvestris 38.3%, Cunninghamia lanceolata 38.5%, Populus sp. 36.0%, Fraxinus excelsior L. 35.6% and Ochroma pyramidale 47.6%. The bound water contents determined by NMR spectroscopy were apparently higher than those obtained by the conventional extrapolation methods, but similar to the results obtained by the solute exclusion method, porous plate method, centrifugal dewatering method. It is concluded that NMR may provide a rapid and non-destructive way to determine bound water content in wood.

Key words： nuclear magnetic resonance(NMR); bound water content; spin-spin relaxation time; wood; cell wall

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