期刊
MOLECULES
卷 25, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/molecules25051113
关键词
waterlogged archaeological wood; cell wall structure; cell wall mechanics; deterioration; FTIR imaging; Raman imaging
资金
- Fundamental Research Funds for the Central Non-profit Research Institution of CAF [CAFYBB2018QB006]
- Chinese National Natural Science Foundation [31600450]
- China Scholarship Council [CSC201803270037]
Structural and chemical deterioration and its impact on cell wall mechanics were investigated for visually intact cell walls (VICWs) in waterlogged archaeological wood (WAW). Cell wall mechanical properties were examined by nanoindentation without prior embedding. WAW showed more than 25% decrease of both hardness and elastic modulus. Changes of cell wall composition, cellulose crystallite structure and porosity were investigated by ATR-FTIR imaging, Raman imaging, wet chemistry, C-13-solid state NMR, pyrolysis-GC/MS, wide angle X-ray scattering, and N-2 nitrogen adsorption. VICWs in WAW possessed a cleavage of carboxyl in side chains of xylan, a serious loss of polysaccharides, and a partial breakage of beta -O-4 interlinks in lignin. This was accompanied by a higher amount of mesopores in cell walls. Even VICWs in WAW were severely deteriorated at the nanoscale with impact on mechanics, which has strong implications for the conservation of archaeological shipwrecks.
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