Sample Thickness and Edge Proximity Influence Spatial Behavior of Filaments and Treatment Uniformity of RF Cold Atmospheric Pressure Plasma Jet

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL Plasma Chemistry and Plasma Processing Pub Date : 2024-10-10 DOI:10.1007/s11090-024-10517-0

Kateřina Polášková, David Nečas, Lukáš Dostál, Miloš Klíma, Lenka Zajíčková

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Abstract

The ability of atmospheric pressure plasma jets to treat complex non-planar surfaces is often cited as their advantage over other atmospheric plasmas. However, the effect of complex surfaces on plasma parameters and treatment efficiency has seldom been studied. Herein, we investigate the interaction of the atmospheric pressure plasma slit jet (PSJ) with block polypropylene samples of different thicknesses (5 and 30 mm) moving at two different speeds. Even though the distance between the slit outlet and the sample surface was kept constant, the treatment efficiency of PSJ ignited in the Ar and \(\hbox {Ar/O}_2\) gas feeds varied with the sample thickness due to the plasma parameters such as filament count and speed being affected by the different distances of the ground (the closer the ground is, the higher the discharge electric field). On the other hand, the \(\hbox {Ar/N}_2\) PSJ diffuse plasma plumes were less affected by the changes in the electric field, and the treatment efficiency was the same for both sample thicknesses. Additionally, we observed a difference in the efficiency and uniformity of the PSJ treatment of the edges and the central areas in some working conditions. The treatment efficiency near the edges depended on the duration of the filament contact, i. e., how long the local electric field trapped the filaments. Conversely, the treatment uniformity near the edges and in the central areas was different if the number of filaments changed rapidly as the discharge moved on and off the sample (the 5 mm samples treated by easily sustained Ar PSJ).

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样品厚度和边缘接近度影响冷常压等离子体射流的空间行为和处理均匀性

大气压等离子体射流处理复杂非平面表面的能力通常被认为是其优于其他大气等离子体的优势。然而，复杂表面对等离子体参数和处理效率的影响研究很少。在此，我们研究了大气压等离子体狭缝射流（PSJ）与以两种不同速度运动的不同厚度（5和30 mm）块状聚丙烯样品的相互作用。即使狭缝出口与样品表面的距离保持不变，在Ar和\(\hbox {Ar/O}_2\)气体进料中点燃的PSJ处理效率也会随着样品厚度的不同而变化，这是由于等离子体参数（如灯丝数和速度）受到离地距离的影响（离地越近，放电电场越大）。另一方面，\(\hbox {Ar/N}_2\) PSJ扩散等离子体羽流受电场变化的影响较小，两种样品厚度下的处理效率相同。此外，我们观察到在某些工作条件下，边缘和中心区域的PSJ处理的效率和均匀性存在差异。边缘附近的处理效率取决于灯丝接触的持续时间，即局部电场捕获灯丝的时间。相反，如果随着放电进入和离开样品（5 mm样品用容易持续的Ar PSJ处理），细丝数量迅速变化，则边缘附近和中心区域的处理均匀性不同。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.