Even Visually Intact Cell Walls in Waterlogged Archaeological Wood Are Chemically Deteriorated and Mechanically Fragile : A Case of a 170 Year-Old Shipwreck

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Han , L , Tian , X , Keplinger , T , Zhou , H , Li , R , Svedström , K , Burgert , I , Yin , Y & Guo , J 2020 , ' Even Visually Intact Cell Walls in Waterlogged Archaeological Wood Are Chemically Deteriorated and Mechanically Fragile : A Case of a 170 Year-Old Shipwreck ' , Molecules , vol. 25 , no. 5 , 1113 . https://doi.org/10.3390/molecules25051113

Title: Even Visually Intact Cell Walls in Waterlogged Archaeological Wood Are Chemically Deteriorated and Mechanically Fragile : A Case of a 170 Year-Old Shipwreck
Author: Han, Liuyang; Tian, Xingling; Keplinger, Tobias; Zhou, Haibin; Li, Ren; Svedström, Kirsi; Burgert, Ingo; Yin, Yafang; Guo, Juan
Other contributor: University of Helsinki, Department of Physics
Date: 2020-03-01
Language: eng
Number of pages: 16
Belongs to series: Molecules
ISSN: 1420-3049
DOI: https://doi.org/10.3390/molecules25051113
URI: http://hdl.handle.net/10138/315220
Abstract: 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.
Subject: waterlogged archaeological wood
cell wall structure
cell wall mechanics
deterioration
FTIR imaging
Raman imaging
WARSHIP VASA
OAK WOOD
DEGRADATION
POROSITY
LIGNIN
MICROMECHANICS
CONSERVATION
REDUCTION
SOFTWOOD
HARDWOOD
114 Physical sciences
116 Chemical sciences
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