Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method.
Near-infrared spectroscopic observation of the ageing process in archaeological wood using a deuterium exchange method.
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DOI：
10.1039/b412759e
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发表时间：
2005-02
期刊：
影响因子：
--
通讯作者：
S. Tsuchikawa;H. Yonenobu;H. Siesler
中科院分区：
文献类型：
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作者：
S. Tsuchikawa;H. Yonenobu;H. Siesler
采用傅里叶变换近红外光谱技术，结合氘交换法，研究了干燥暴露的考古木材细木结构的老化降解。考古木材样本取自日本一座古老的木造寺庙（世纪晚期），该寺庙已被指定为联合国教科文组织世界遗产。将分析结果与同一物种的现代木材样品的分析结果进行比较，阐明了考古木材的老化过程是大分子结构水平上有序状态的变化。从近红外光谱可以得出结论，在纤维素，半纤维素和木质素的无定形区，部分半结晶区，老化降解减少，而在纤维素的结晶区不受老化的影响。的扩散剂的访问效果H/D-交换监测OH-相关的吸收带从FT-NIR透射光谱得到的，并与木材样品的老化过程中，一个特定的状态的顺序和扩散剂的吸收带的特性而变化的特征。最后，我们提出了一个形态学模型来描述细胞壁中的微纤维的精细结构的变化与老化降解。微纤丝的状态变化松散的老化，使初级原纤维松散地排列在5 A，而现代木材中的几个初级原纤维排列在非常接近下3 A到彼此。
The ageing degradation of the fine wood structure of dry-exposed archaeological wood was investigated by Fourier transform near-infrared spectroscopy with the aid of a deuterium exchange method. The archaeological wood sample was taken from an old wooden temple in Japan (late 7th century), which has been designated as a UNESCO world heritage site. Comparing the analytical results with those of a modern wood sample of the same species, the ageing process of archaeological wood was clarified as a change in the state of order on a macromolecular structural level. It can be concluded from NIR spectra that the amorphous region, and partially semi-crystalline region, in cellulose, hemicellulose, and lignin decreased by the ageing degradation, whereas the crystalline region in cellulose was not affected by the ageing. The accessibility of the diffusant to effect H/D-exchange was monitored by an OH-related absorption band obtained from FT-NIR transmission spectroscopy and characteristically varied with the ageing process of the wood samples, the absorption bands characteristic of a specific state of order and the diffusion agent. Finally, we proposed a morphological model to describe the variation of the fine structure of the microfibrils in the cell wall with ageing degradation. The state of microfibrils changed loosely by ageing, so that elementary fibrils were arranged loosely under 5 A, whereas several elementary fibrils in the modern wood were arranged in very close proximity under 3 A to each other.