Atmospheric pressure plasma jets driven by ac and pulsed-dc voltage were characterized, operating in helium with different admixture fractions up to 2% pure air, N2, and O2. The absolute production efficiency of nitrogen dioxide, nitric oxide, ozone, hydroxyl, and atomic oxygen was measured when plasma was processing real biological tissue. The power consumption of each power source, the effect of frequency, and gas composition were investigated. It has been found that the power consumption of 10-kHz ac-driven plasma jets increases with gas mixture increasing from 0% to 0.5% and then decreases slightly with gas mixture increasing from 0.5% to 2.0%, while 1-kHz ac-driven plasma jets are almost constant. Moreover, the average dissipated power of 10-kHz ac-driven plasma jets was about ten times more than that of the 1-kHz case, while the power consumption of P-dc-driven plasma jets was not drastically affected by gas admixture. Furthermore, O2 and air were important impurities contributing to the O, O3, and NO2 production efficiency, while N2 admixture would enable the diminution of O and O3 production efficiency. Especially, an admixture of O2, N2, and air to the main helium flow led to a reduction of OH and NO production efficiency for both ac and pulsed-dc power supply. This research may prove to be valuable both for an attainable range of RONS production efficiency and plasma medical research as a tool for assigning specific RONS or RONS mixtures.

中文翻译：

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交流和脉冲直流等离子射流的活性氧和氮 (RONS) 生产效率


对由交流和脉冲直流电压驱动的大气压等离子体射流进行了表征，在氦气中运行，混合比例高达 2% 的纯空气、氮气和氧气。当等离子体处理真实的生物组织时，测量了二氧化氮、一氧化氮、臭氧、羟基和原子氧的绝对生产效率。研究了每个电源的功耗、频率的影响和气体成分。研究发现，10 kHz交流驱动等离子体射流的功耗随着气体混合物从0%增加到0.5%而增加，然后随着气体混合物从0.5%增加到2.0%而略有下降，而1 kHz交流驱动等离子体射流的功耗则随着气体混合物从0.5%增加到2.0%而略有下降。等离子射流几乎是恒定的。此外，10kHz交流驱动等离子体射流的平均耗散功率大约是1kHz情况的十倍，而P-dc驱动等离子体射流的功耗并没有受到气体混合物的显着影响。此外，O2和空气是影响O、O3和NO2生产效率的重要杂质，而N2混合物会降低O和O3的生产效率。特别是，主氦流中混合了 O2、N2 和空气，导致交流和脉冲直流电源的 OH 和 NO 生产效率降低。这项研究可能被证明对于可达到的 RONS 生产效率范围和作为分配特定 RONS 或 RONS 混合物的工具的血浆医学研究都很有价值。