One-sided surface charring of beech wood

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One-sided surface charring of beech wood. / Čermák, Petr; Dejmal, Aleš; Paschová, Zuzana; Kymäläinen, Maija; Dömény, Jakub; Brabec, Martin; Hess, Dominik; Rautkari, Lauri.

In: Journal of Materials Science, Vol. 54, No. 13, 15.07.2019, p. 9497-9506.

Research output: Contribution to journalArticleScientificpeer-review

Harvard

Čermák, P, Dejmal, A, Paschová, Z, Kymäläinen, M, Dömény, J, Brabec, M, Hess, D & Rautkari, L 2019, 'One-sided surface charring of beech wood', Journal of Materials Science, vol. 54, no. 13, pp. 9497-9506. https://doi.org/10.1007/s10853-019-03589-3

APA

Vancouver

Čermák P, Dejmal A, Paschová Z, Kymäläinen M, Dömény J, Brabec M et al. One-sided surface charring of beech wood. Journal of Materials Science. 2019 Jul 15;54(13):9497-9506. https://doi.org/10.1007/s10853-019-03589-3

Author

Čermák, Petr ; Dejmal, Aleš ; Paschová, Zuzana ; Kymäläinen, Maija ; Dömény, Jakub ; Brabec, Martin ; Hess, Dominik ; Rautkari, Lauri. / One-sided surface charring of beech wood. In: Journal of Materials Science. 2019 ; Vol. 54, No. 13. pp. 9497-9506.

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@article{50a81275fd884a64a1ac1698cc929cd2,
title = "One-sided surface charring of beech wood",
abstract = "One-sided surface charring of beech wood (Fagus sylvatica L.) was analyzed. Specimens were charred on one surface using contact heating system with a hot plate, at a temperature of 220 °C and atmospheric pressure for 15 or 40 min. Surface charring was applied on the radial or tangential surface. Spectrophotometric chemical analysis was carried out to determine the total amount of soluble carbohydrates and phenolic compounds beneath the surface in order to evaluate the depth (within 1, 2, 3 and 4 mm) of the degradation affected by the charring. Specimens of dimensions 14 × 14 × 14 mm were used to determine the moisture behavior of charred specimens. The equilibrium moisture content (EMC) of specimens was calculated at a temperature of 20 °C and 65{\%} relative humidity. Water absorption (WA) was recorded during the water immersion for 240 h at various intervals. Finally, the three-point bending tests were undertaken and modulus of rupture (MOR) and modulus of elasticity were calculated. Degradation of the main wood compounds due to chemical changes occurred during the surface charring is closely associated with a mass loss (3.5–5.5{\%}) and further related to the severity of process and orientation of specimens to heat flow. Application of surface charring resulted in the significant reduction in EMC (~ 20{\%}) as a result of a decrease in hydroxyl groups, an increase in cellulose crystallinity as well as further cross-linking of lignin. Furthermore, the WA of one-sided surface-charred wood considerably decreased (15{\%}) when compared to that of the control specimens. A significant increase in soluble carbohydrates as well as phenolic compounds was found, and it can be stated that one-sided charring affected wood properties to depth 2–3 mm from the surface. Significant differences (14–24{\%}) of bending strength MOR results are most likely due to improved sorption behavior of wood. The results show that beech wood charring improved moisture-related characteristics and consequently led to better mechanical behavior, but more studies are needed to exploit the potential of surface charring method for future use.",
author = "Petr Čerm{\'a}k and Aleš Dejmal and Zuzana Paschov{\'a} and Maija Kym{\"a}l{\"a}inen and Jakub D{\"o}m{\'e}ny and Martin Brabec and Dominik Hess and Lauri Rautkari",
year = "2019",
month = "7",
day = "15",
doi = "10.1007/s10853-019-03589-3",
language = "English",
volume = "54",
pages = "9497--9506",
journal = "Journal of Materials Science",
issn = "0022-2461",
number = "13",

}

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TY - JOUR

T1 - One-sided surface charring of beech wood

AU - Čermák, Petr

AU - Dejmal, Aleš

AU - Paschová, Zuzana

AU - Kymäläinen, Maija

AU - Dömény, Jakub

AU - Brabec, Martin

AU - Hess, Dominik

AU - Rautkari, Lauri

PY - 2019/7/15

Y1 - 2019/7/15

N2 - One-sided surface charring of beech wood (Fagus sylvatica L.) was analyzed. Specimens were charred on one surface using contact heating system with a hot plate, at a temperature of 220 °C and atmospheric pressure for 15 or 40 min. Surface charring was applied on the radial or tangential surface. Spectrophotometric chemical analysis was carried out to determine the total amount of soluble carbohydrates and phenolic compounds beneath the surface in order to evaluate the depth (within 1, 2, 3 and 4 mm) of the degradation affected by the charring. Specimens of dimensions 14 × 14 × 14 mm were used to determine the moisture behavior of charred specimens. The equilibrium moisture content (EMC) of specimens was calculated at a temperature of 20 °C and 65% relative humidity. Water absorption (WA) was recorded during the water immersion for 240 h at various intervals. Finally, the three-point bending tests were undertaken and modulus of rupture (MOR) and modulus of elasticity were calculated. Degradation of the main wood compounds due to chemical changes occurred during the surface charring is closely associated with a mass loss (3.5–5.5%) and further related to the severity of process and orientation of specimens to heat flow. Application of surface charring resulted in the significant reduction in EMC (~ 20%) as a result of a decrease in hydroxyl groups, an increase in cellulose crystallinity as well as further cross-linking of lignin. Furthermore, the WA of one-sided surface-charred wood considerably decreased (15%) when compared to that of the control specimens. A significant increase in soluble carbohydrates as well as phenolic compounds was found, and it can be stated that one-sided charring affected wood properties to depth 2–3 mm from the surface. Significant differences (14–24%) of bending strength MOR results are most likely due to improved sorption behavior of wood. The results show that beech wood charring improved moisture-related characteristics and consequently led to better mechanical behavior, but more studies are needed to exploit the potential of surface charring method for future use.

AB - One-sided surface charring of beech wood (Fagus sylvatica L.) was analyzed. Specimens were charred on one surface using contact heating system with a hot plate, at a temperature of 220 °C and atmospheric pressure for 15 or 40 min. Surface charring was applied on the radial or tangential surface. Spectrophotometric chemical analysis was carried out to determine the total amount of soluble carbohydrates and phenolic compounds beneath the surface in order to evaluate the depth (within 1, 2, 3 and 4 mm) of the degradation affected by the charring. Specimens of dimensions 14 × 14 × 14 mm were used to determine the moisture behavior of charred specimens. The equilibrium moisture content (EMC) of specimens was calculated at a temperature of 20 °C and 65% relative humidity. Water absorption (WA) was recorded during the water immersion for 240 h at various intervals. Finally, the three-point bending tests were undertaken and modulus of rupture (MOR) and modulus of elasticity were calculated. Degradation of the main wood compounds due to chemical changes occurred during the surface charring is closely associated with a mass loss (3.5–5.5%) and further related to the severity of process and orientation of specimens to heat flow. Application of surface charring resulted in the significant reduction in EMC (~ 20%) as a result of a decrease in hydroxyl groups, an increase in cellulose crystallinity as well as further cross-linking of lignin. Furthermore, the WA of one-sided surface-charred wood considerably decreased (15%) when compared to that of the control specimens. A significant increase in soluble carbohydrates as well as phenolic compounds was found, and it can be stated that one-sided charring affected wood properties to depth 2–3 mm from the surface. Significant differences (14–24%) of bending strength MOR results are most likely due to improved sorption behavior of wood. The results show that beech wood charring improved moisture-related characteristics and consequently led to better mechanical behavior, but more studies are needed to exploit the potential of surface charring method for future use.

UR - http://www.scopus.com/inward/record.url?scp=85064570326&partnerID=8YFLogxK

U2 - 10.1007/s10853-019-03589-3

DO - 10.1007/s10853-019-03589-3

M3 - Article

VL - 54

SP - 9497

EP - 9506

JO - Journal of Materials Science

JF - Journal of Materials Science

SN - 0022-2461

IS - 13

ER -

ID: 33559462