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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Air plasma treatment of liquid covered tissue: long timescale chemistry
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Air plasma treatment of liquid covered tissue: long timescale chemistry

机译：空气等离子体处理液体覆盖组织的长时程化学反应

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Atmospheric pressure plasmas have shown great promise for the treatment of wounds and cancerous tumors. In these applications, the sample is usually covered by a thin layer of a biological liquid. The reactive oxygen and nitrogen species (RONS) generated by the plasma activate and are processed by the liquid before the plasma produced activation reaches the tissue. The synergy between the plasma and the liquid, including evaporation and the solvation of ions and neutrals, is critical to understanding the outcome of plasma treatment. The atmospheric pressure plasma sources used in these procedures are typically repetitively pulsed. The processes activated by the plasma sources have multiple timescales-from a few ns during the discharge pulse to many minutes for reactions in the liquid. In this paper we discuss results from a computational investigation of plasma-liquid interactions and liquid phase chemistry using a global model with the goal of addressing this large dynamic range in timescales. In modeling air plasmas produced by a dielectric barrier discharge over liquid covered tissue, 5000 voltage pulses were simulated, followed by 5 min of afterglow. Due to the accumulation of long-lived species such as ozone and NxOy, the gas phase dynamics of the 5000th discharge pulse are different from those of the first pulse, particularly with regards to the negative ions. The consequences of applied voltage, gas flow, pulse repetition frequency, and the presence of organic molecules in the liquid on the gas and liquid reactive species are discussed.
机译：大气压血浆已显示出治疗伤口和癌性肿瘤的巨大希望。在这些应用中，样品通常被一层薄薄的生物液体覆盖。在血浆产生的活化作用到达组织之前，由血浆产生的反应性氧和氮物质（RONS）会被液体活化并进行处理。等离子体与液体之间的协同作用，包括离子和中性离子的蒸发以及溶剂化，对于理解等离子体处理的结果至关重要。在这些程序中使用的大气压等离子体源通常是重复脉冲的。等离子体源激活的过程具有多个时间范围-从放电脉冲期间的几ns到液体中反应的几分钟。在本文中，我们讨论了使用全局模型对等离子-液体相互作用和液相化学进行计算研究的结果，目的是解决时标中的较大动态范围。在对由液体覆盖的组织上的电介质势垒放电产生的空气等离子体进行建模时，模拟了5000个电压脉冲，然后进行了5分钟的余辉。由于长寿命物质（例如臭氧和NxOy）的积累，第5000个放电脉冲的气相动力学与第一个脉冲的气相动力学不同，特别是在负离子方面。讨论了施加电压，气体流量，脉冲重复频率以及液体中的有机分子在气体和液体反应性物质上的存在的后果。

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