不同结构的转移atmospheric pressure等离子体射流及其在聚合物处理中的应用
Different configurations of transferred atmospheric pressure plasma jet and their application to polymer treatment
摘要：
大气压等离子体射流（APPJs）在大范围应用中的应用受到与处理区域的大小和到达目标的困难相关的不利条件的限制。在其结构中采用长管的装置的使用显著有助于克服这些挑战。在这项工作中，两个不同的等离子体系统采用射流传输技术之间的比较。两种器械之间的主要差异在于长塑料管的组装方式。第一种方法是将铜线放在一根长塑料管中。另一种装置具有安装在两个同轴塑料管之间的同心布置的金属网。因此，两种APPJ系统表现出不同的特性，与网格安装相比，线组件更强大，也呈现出更高的电流和旋转温度值。X射线光电子能谱学（XPS）表明，两种构型都能在聚丙烯（PP）表面插入含氧官能团。然而，转移的等离子体射流与丝组装能够在PP表面上添加更多的官能团。XPS分析的结果与水接触角测量（WCA）相证实，即当PP表面呈现较高量的含O基团时，获得较低的WCA值。表面形态评价表明，等离子体处理往往略有增加的表面粗糙度的PP样品与线和网配置。此外，在这项工作中的发现表明，与线配置的APPJ是更适合于材料的治疗，而与网格排列的转移射流往往呈现较低的电流值，这使得它更适合于生物应用。
英文摘要：
The employment of atmospheric pressure plasma jets (APPJs) in a large sort of applications is limited by the adversities related to the size of the treated area and the difficulty to reach the target. The use of devices that employ long tubes in their structure has contributed significantly to overcome these challenges. In this work, a comparison between two different plasma systems employing the jet transfer technique is presented. The main difference between the two devices is how the long plastic tube was assembled. The first one uses a copper wire placed inside a long plastic tube. The other device has a metallic mesh installed in a concentric arrangement between two coaxial plastic tubes. As a result, the two APPJ systems exhibit different properties, with the wire assembly being more powerful, also presenting higher values for the electrical current and rotational temperature when compared to the mesh mounting. X-ray photoelectron spectroscopy (XPS) demonstrates that both configurations were capable of inserting O-containing functional groups on the polypropylene (PP) surface. However, the transferred plasma jet with wire assembly was able to add more functional groups on the PP surface. The results from XPS analysis were corroborated with water contact angle measurements (WCA), being that lower WCA values were obtained when the PP surface presented higher amounts of O-containing groups. Surface morphology evaluation showed that the plasma treatment tends to slightly increase the surface roughness of the PP samples with both wire and mesh configurations. Furthermore, the findings in this work suggest that the APPJ with wire configuration is more appropriate for material treatments, while the transferred jet with mesh arrangement tends to present lower electrical current values which makes it more suitable for biological applications.
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