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Surface properties of thermally treated European beech wood studied by PeakForce Tapping atomic force microscopy and Fourier-transform infrared spectroscopy
Holzforschung ( IF 2.4 ) Pub Date : 2021-01-26 , DOI: 10.1515/hf-2019-0146 Rastislav Lagaňa 1 , Csilla Csiha 2 , Norbert Horváth 2 , László Tolvaj 2 , Tomáš Andor 3 , Jozef Kúdela 3 , Róbert Németh 2 , František Kačík 3 , Jaroslav Ďurkovič 3
Holzforschung ( IF 2.4 ) Pub Date : 2021-01-26 , DOI: 10.1515/hf-2019-0146 Rastislav Lagaňa 1 , Csilla Csiha 2 , Norbert Horváth 2 , László Tolvaj 2 , Tomáš Andor 3 , Jozef Kúdela 3 , Róbert Németh 2 , František Kačík 3 , Jaroslav Ďurkovič 3
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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.
中文翻译:
通过 PeakForce Tapping 原子力显微镜和傅里叶变换红外光谱研究热处理欧洲山毛榉木材的表面特性
摘要 热处理会以多种方式影响木材细胞壁层的天然成分。本研究调查了高温处理对细胞壁层特性的影响。使用 PeakForce 定量纳米力学映射和傅里叶变换红外光谱 (FTIR) 研究了这些特性。欧洲山毛榉木材在氧化气氛中在 200 °C 下热处理 1、3 和 5 小时。使用原子力显微镜 (AFM) 确定第二层 S2 和复合中间层 (CML) 的弹性模量、粘附力和粗糙度。结果表明,S2层和CML都受到热处理的影响。S2 层变硬是由纤维素占主导地位的组分结晶度增加引起的,在处理 1 小时后达到峰值。此后的退化导致 S2 和 CML 刚度降低。处理 3 小时后 CML 粗糙度的增加与热降解对 CML 完整性的影响有关。分析表明,丁香基木质素的减少可能与细胞壁层粘附的增加有关。
更新日期:2021-01-26
中文翻译:
通过 PeakForce Tapping 原子力显微镜和傅里叶变换红外光谱研究热处理欧洲山毛榉木材的表面特性
摘要 热处理会以多种方式影响木材细胞壁层的天然成分。本研究调查了高温处理对细胞壁层特性的影响。使用 PeakForce 定量纳米力学映射和傅里叶变换红外光谱 (FTIR) 研究了这些特性。欧洲山毛榉木材在氧化气氛中在 200 °C 下热处理 1、3 和 5 小时。使用原子力显微镜 (AFM) 确定第二层 S2 和复合中间层 (CML) 的弹性模量、粘附力和粗糙度。结果表明,S2层和CML都受到热处理的影响。S2 层变硬是由纤维素占主导地位的组分结晶度增加引起的,在处理 1 小时后达到峰值。此后的退化导致 S2 和 CML 刚度降低。处理 3 小时后 CML 粗糙度的增加与热降解对 CML 完整性的影响有关。分析表明,丁香基木质素的减少可能与细胞壁层粘附的增加有关。