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Surface properties of thermally treated European beech wood studied by PeakForce Tapping atomic force microscopy and Fourier-transform infrared spectroscopy

Rastislav Lagaňa ORCID logo, Csilla Csiha ORCID logo, Norbert Horváth, László Tolvaj, Tomáš Andor, Jozef Kúdela, Róbert Németh ORCID logo, František Kačík ORCID logo and Jaroslav Ďurkovič ORCID logo
From the journal Holzforschung

Abstract

Natural constituents of wood cell-wall layers are affected in various ways by thermal treatment. This study investigated the effect of high-temperature treatment on the properties of cell-wall layers. The properties were studied using PeakForce quantitative nanomechanical mapping and Fourier-transform infrared spectroscopy (FTIR). European beech wood was thermally treated at 200 °C for 1, 3, and 5 h in an oxidizing atmosphere. Modulus of elasticity, adhesion force, and roughness of the secondary S2 layer and the compound middle lamella (CML) were determined using atomic force microscopy (AFM). Results showed that both the S2 layer and CML were affected by thermal treatment. Stiffening of the S2 layer was caused by increased crystallinity of the cellulose-dominated component, having peaked after 1 h of treatment. The degradation thereafter resulted in a decrease of the S2 as well as the CML stiffness. An increase of CML roughness after 3 h of treatment was associated with the effect of thermal degradation on CML integrity. The analysis suggested that the reduction in syringyl lignin is potentially associated with an increase in adhesion of cell-wall layers.


Corresponding author: Rastislav Lagaňa, Department of Wood Science, Technical University in Zvolen, T. G. Masaryka 24, Zvolen, 96053, Slovakia, E-mail:

Funding source: Slovak Research and Development Agency

Award Identifier / Grant number: APVV-16-0177

Award Identifier / Grant number: APVV SK-HU-2013-0035

Funding source: Slovak Scientific Grant Agency VEGA

Award Identifier / Grant number: 1/0450/19

Funding source: National Research, Development and Innovation Fund of Hungary

Award Identifier / Grant number: TÉT_12_SK-1-2013-0035

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by the Slovak Research and Development Agency (grant nos. APVV-16-0177, APVV SK-HU-2013-0035), the Slovak Scientific Grant Agency VEGA (grant no. 1/0450/19) and the National Research, Development and Innovation Fund of Hungary (grant no. TÉT_12_SK-1-2013-0035)

  3. Employment or leadership: None declared.

  4. Honorarium: None declared.

  5. Conflict of interest statement: The authors declare that there is no conflict of interest regarding this study.

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Received: 2019-05-17
Accepted: 2020-03-24
Published Online: 2020-06-29
Published in Print: 2021-01-26

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