Study of artificially degraded woods simulating natural ageing of archaeological findings |
| |
Authors: | E Franceschi I Cascone D Nole |
| |
Institution: | (1) Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146 Genoa, Italy |
| |
Abstract: | Simulation of waterlogged archaeological woods was carried out by immersion of fir and chestnut wood samples into sea water
at different temperatures (room temperature and 40°C). The effects of metals in contact with woods were simulated by inserting
in some specimens of the two types of wood copper or iron nails, the most important metals from the archaeological point of
view. The effects of this ageing simulation on woods were studied by different characterization methods. At first we have
performed gravimetric analyses, controlling the mass increase of immersed wood in function of the time of immersion and the
temperature of the bath. Then, thermogravimetry, differential thermal analysis, differential scanning calorimetry in oxygen
flux were used. The alteration of wood was observed by means of the peak temperatures of DTA, DTG and DSC variation and by
the mass losses observed during heating, evaluated on the basis of the measured thermal data. The samples were woods powder
obtained by milling. Complementary characterization of the woods was performed by evaluating the crystallinity of cellulose
by means of X-ray powder diffraction. The change in colour of woods during ageing was checked by means of spectrophotometric
measurements in the visible region.
X-ray fluorescence was used to investigate the penetration of metals into wood samples. An artificial ageing treatment with
NaOH and O3 was also performed.
Finally, a comparison between the effects of artificial alteration realised in our specimens and natural degradation observed
in archaeological woods, was performed. |
| |
Keywords: | degradation thermal analysis waterlogged wood |
本文献已被 SpringerLink 等数据库收录! |
|