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Effect of one-sided surface charring of beech wood on density profile and surface wettability
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SYSNO ASEP 0542187 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of one-sided surface charring of beech wood on density profile and surface wettability Author(s) Šeda, V. (CZ)
Machová, Dita (UTAM-F) RID, ORCID, SAI
Dohnal, J. (CZ)
Dömény, J. (CZ)
Zárybnická, Lucie (UTAM-F) RID, SAI, ORCID
Oberle, A. (AT)
Vacenovská, V. (CZ)
Čermák, P. (CZ)Number of authors 8 Article number 4086 Source Title Applied Sciences-Basel. - : MDPI
Roč. 11, č. 9 (2021)Number of pages 10 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords contact angle ; density profile ; charring ; charred surface ; thermal degradation ; wateruptake ; wood modification Subject RIV JK - Corrosion ; Surface Treatment of Materials OECD category Paper and wood Method of publishing Open access Institutional support UTAM-F - RVO:68378297 UT WOS 000649897500001 EID SCOPUS 85105807295 DOI 10.3390/app11094086 Annotation One-sided surface charred European beech wood (Fagus sylvatica L.) was studied. Radial and tangential specimens of dimensions of 50 x 25 x 350 mm were one-sided surface charred at 200, 250, 300, 350, and 400 °C for various times using a contact heating system. Specimens of dimensions of 50 x 25 x 50 mm3 were prepared for treatment intensity analysis and its effect on surface wettability. Density profiles of the radial and tangential charred specimens were determined using X-ray densitography with a resolution of 0.05 mm. The wettability of the one-sided surface charred wood specimens was analyzed via contact angle, measured using the sessile drop method and determined over 10 to 150 s. The oven-dried specimens were partially submerged in water and water uptake was recorded after 2, 4, 6, 8, 10, 48, and 72 h according to EN-927-5. The surface density of the radial specimen groups charred at 200 °C for 6 min and 250 °C for 4 min decreased by about 4.5 to 8.2%. With increasingly severe charring, the surface density decreased by about 15.5 to 33.5%. A mild charring process produced a surface charred layer of approx. 2 mm, while higher temperatures and longer times affected the density up to 4–6 mm beneath the surface. Differences were found between the water uptake of the radial and tangential charred beech specimens. The most significant decrease of 56% in water uptake was recorded for the radial group prepared at 200 °C for 20 min after floating in water for 72 h. Water uptake in the radial groups modified at 250 °C for 4 and 6 min after 72 h decreased by 38% and 36%, respectively. The tangential groups did not show any statistically significant decrease. The average water uptake of the groups charred at 200 °C for 20 min, 350 °C for 2 min and 400 °C for 1 min was greater than that of the reference, the variability of the measured data was significantly greater due to the highly anisotropic character of the tangential specimens. Micro cracks were also visible on the surface. Concluding from the results of this study, one-sided surface charred beech wood exhibits increased potential in terms of wood–water related properties when a temperature range of 200–400 °C is applied. Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2022 Electronic address https://doi.org/10.3390/app11094086
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