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首页> 外文期刊>Applied Surface Science >Surface free radicals detection using molecular scavenging method on black spruce wood treated with cold, atmospheric-pressure plasmas
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Surface free radicals detection using molecular scavenging method on black spruce wood treated with cold, atmospheric-pressure plasmas

机译：用分子清除方法检测冷常压等离子体处理的黑云杉木材表面自由基

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摘要

Formation of surface free radicals on wood surfaces during plasma treatment could be an important factor when it comes to wood coating adhesion enhancement. In order to explore this aspect, freshly sanded black spruce (Picea mariana) wood samples were exposed to either plane-to-plane atmospheric-pressure dielectric barrier discharge (AP-DBD) or the flowing afterglow of an AP-DBD and then dipped in a 2,2-diphenyl-1-picrylhydrazyl (DPPH) solution. Wood veneers (extracted to eliminate small molecules prior to each plasma treatment) showed an increase of their reaction rate toward DPPH after treatment in the AP-DBD operated in nominally pure He; a feature ascribed to the plasma-assisted formation of free radicals on the wood surface. Addition of trace amounts (0.1%) of O-2 in the He plasma produced a decrease in DPPH reactivity, suggesting that oxygen-spruce interaction during plasma treatment quenches free radicals formation. Similar experiments performed using the flowing afterglow of AP-DBD operated in either N-2 or N-2/O-2 showed that both treatments do not generate significant amount of surface free radicals. This partially results from oxygen-wood interactions due to the open-air configuration of the afterglow reactor. (C) 2015 Elsevier B.V. All rights reserved.
机译：在等离子处理过程中，木质表面表面自由基的形成可能是提高木质涂层附着力的重要因素。为了探索这一方面，将新鲜磨砂的黑云杉（Picea mariana）木材样品暴露于平面对平面的大气压介电阻挡放电（AP-DBD）或AP-DBD流动的余辉下，然后浸入2,2-二苯基-1-吡啶并肼基（DPPH）溶液。木质贴面（在每次等离子处理之前被提取以消除小分子）在以名义上纯He的AP-DBD中处理后，其对DPPH的反应速率增加；一种归因于木质表面上等离子体辅助形成自由基的特征。 He血浆中痕量O-2的添加（0.1％）导致DPPH反应性降低，这表明在等离子体处理过程中氧-云杉的相互作用会终止自由基的形成。使用在N-2或N-2 / O-2中运行的AP-DBD的余辉流动进行的类似实验表明，两种处理均不会产生大量的表面自由基。这部分归因于余辉反应器的露天构型，氧木相互作用。 （C）2015 Elsevier B.V.保留所有权利。

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