Atmospheric pressure plasma jets interacting with liquid covered tissue: touching and not-touching the liquid
Atmospheric pressure plasma jets interacting with liquid covered tissue: touching and not-touching the liquid
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DOI：
10.1088/0022-3727/47/47/475203
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发表时间：
2014-11-26
影响因子：
3.4
通讯作者：
Kushner, Mark J.
中科院分区：
文献类型：
--
作者：
Norberg, Seth A.;Tian, Wei;Kushner, Mark J.
在生物应用中使用大气压等离子体射流时，射流羽流中的等离子体产生的带电和中性物质经常与覆盖在被处理组织上的薄层液体相互作用。然后，等离子体产生的反应性必须穿过液层才能到达组织。在这项计算研究中，由三种不同电压的单个放电脉冲产生的等离子体射流被引导到覆盖组织的200亩m的水层上，随后产生10 S的余辉。产生等离子体羽流的电离波是否到达液体表面，取决于电压的大小及其脉冲长度。当电离波接触表面时，水层中产生的带电物种明显增多，其中H3O+(AQ)、O-3(-)(AQ)和O-2(-)(AQ)是主要的终端物种。当等离子体羽流接触到表面时，也生成了更多的水OHaq、H_2O_2aq和O-3aq。这里研究的单个脉冲对应于低重复频率的等离子体射流，其中反应物质将在脉冲之间被吹出体积，并且没有流动或湍流的再循环。在这些条件下，NxOy物种不会在体积中积累。因此，水中的亚硝酸盐、硝酸盐和过亚硝酸盐，以及HNO3aq和HOONOaq，其起源可追溯到溶剂化的NxOy，具有低密度。
In the use of atmospheric pressure plasma jets in biological applications, the plasma-produced charged and neutral species in the plume of the jet often interact with a thin layer of liquid covering the tissue being treated. The plasma-produced reactivity must then penetrate through the liquid layer to reach the tissue. In this computational investigation, a plasma jet created by a single discharge pulse at three different voltages was directed onto a 200 mu m water layer covering tissue followed by a 10 s afterglow. The magnitude of the voltage and its pulse length determined if the ionization wave producing the plasma plume reached the surface of the liquid. When the ionization wave touches the surface, significantly more charged species were created in the water layer with H3O+ (aq), O-3(-) (aq), and O-2(-) (aq) being the dominant terminal species. More aqueous OHaq, H2O2aq, and O-3aq were also formed when the plasma plume touches the surface. The single pulse examined here corresponds to a low repetition rate plasma jet where reactive species would be blown out of the volume between pulses and there is not recirculation of flow or turbulence. For these conditions, NxOy species do not accumulate in the volume. As a result, aqueous nitrites, nitrates, and peroxynitrite, and the HNO3aq and HOONOaq, which trace their origin to solvated NxOy, have low densities.