This study focused on plasma treatment of European beech ( Fagus sylvatica ) and heat-treated European beech surfaces with varying distance from the planar electrode of the diffuse coplanar surface barrier discharge. In addition to the treatment in the air, plasma treatment was also carried out in O 2 , CO 2 , N 2 and Ar atmospheres. Treatment was differentiated between treatment in the active plasma zone and in the so-called plasma afterglow region. Air plasma treatment in the active plasma zone led to the well-known improvement of surface wettability of polar liquids due to increased polar part of surface free energy. Treatment in plasma afterglow region caused the wettability decline of polar liquids and caused a more hydrophobic surface. The phenomenon was primarily present for air plasma treatment. Oxygen-to-carbon ratio measured by X-ray photoelectron spectroscopy did not change with the treatment in air plasma afterglow. Based on additional tests with pure cellulose paper and based on findings in previous studies, the reason for increased hydrophobicity was suggested to be degradation of hemicelluloses on the wood surface.

中文翻译：

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DCSBD等离子处理距离对木材及热改性木材表面特性的影响

这项研究的重点是对欧洲山毛榉 (Fagus sylvatica) 和经过热处理的欧洲山毛榉表面的等离子体处理，这些表面与扩散共面表面阻挡放电的平面电极的距离不同。除了在空气中处理外，等离子体处理也在O 2 、CO 2 、N 2 和Ar气氛中进行。处理在活性等离子体区和所谓的等离子体余辉区中进行区分。由于表面自由能的极性部分增加，活性等离子体区中的空气等离子体处理导致众所周知的极性液体表面润湿性的改善。等离子体余辉区域的处理导致极性液体的润湿性下降并导致更疏水的表面。这种现象主要出现在空气等离子处理中。X射线光电子能谱测量的氧碳比不随空气等离子体余辉处理而变化。根据对纯纤维素纸的额外测试和之前研究的结果，认为疏水性增加的原因是木材表面半纤维素的降解。