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Structure of oak wood from the Swedish warship Vasa revealed by X-ray scattering and microtomography
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
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2012 (English)In: Holzforschung, ISSN 0018-3830, Vol. 66, no 3, 355-363 p.Article in journal (Refereed) Published
Abstract [en]

The degradation of oak wood of the historical warship Vasa was studied, focusing on cellular structure by X-ray microtomography (mu CT) and on the nanostructure of the cell wall by wide- and small-angle X-ray scattering (WAXS, SAXS). Solid samples [polyethylene glycol (PEG)-, impregnated and PEG-extracted] were submitted to X-ray analysis and the results compared to those of recent oak. The cellular structure of the Vasa oak was surprisingly well preserved at the micrometer level, according to the mu CT images. As revealed by WAXS, the fraction of crystalline cellulose was lower in the Vasa samples compared with recent oak, but the average length and width of cellulose crystallites (25 +/- 2 nm and 3.0 +/- 0.1 nm, respectively), and the mean microfibril angles (4-9 degrees), showed no significant differences. Accordingly, the crystalline parts of cellulose microfibrils are well preserved in the Vasa oak. The SAXS results indicated a declined short-range order between the cellulose microfibrils and a higher porosity of the Vasa oak compared with recent oak, which may be explained by modification of the hemicellulose-lignin matrix.

Place, publisher, year, edition, pages
2012. Vol. 66, no 3, 355-363 p.
Keyword [en]
cellulose crystallite, oak, SAXS, Vasa, WAXS, X-ray microtomography
National Category
Wood Science
URN: urn:nbn:se:kth:diva-95492DOI: 10.1515/HF.2011.157ISI: 000303475300011ScopusID: 2-s2.0-84860634384OAI: diva2:528625
Swedish Research Council
QC 20120528Available from: 2012-05-28 Created: 2012-05-28 Last updated: 2012-05-28Bibliographically approved

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Bjurhager, Ingela
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