Stephan Karl D, McLean Robert J C, DeLeon Gian, Melnikov Vadim
Ingram School of Engineering, Texas State University, San Marcos, TX, USA.
Department of Biology, Texas State University, San Marcos, TX, USA.
Technol Health Care. 2016 Nov 14;24(6):943-948. doi: 10.3233/THC-161226.
We investigate the effect of feed-gas humidity on the oxidative properties of an atmospheric-pressure plasma jet using nitrogen gas.
Plasma jets operating at atmospheric pressure are finding uses in medical and biological settings for sterilization and other applications involving oxidative stress applied to organisms. Most jets use noble gases, but some researchers use less expensive nitrogen gas. The feed-gas water content (humidity) has been found to influence the performance of noble-gas plasma jets, but has not yet been systematically investigated for jets using nitrogen gas.
Low-humidity and high-humidity feed gases were used in a nitrogen plasma jet, and the oxidation effect of the jet was measured quantitatively using a chemical dosimeter known as FBX (ferrous sulfate-benzoic acid-xylenol orange).
The plasma jet using high humidity was found to have about ten times the oxidation effect of the low-humidity jet, as measured by comparison with the addition of measured amounts of hydrogen peroxide to the FBX dosimeter.
Atmospheric-pressure plasma jets using nitrogen as a feed gas have a greater oxidizing effect with a high level of humidity added to the feed gas.
我们研究了原料气湿度对使用氮气的大气压等离子体射流氧化特性的影响。
在医疗和生物环境中，大气压下运行的等离子体射流正被用于杀菌以及其他涉及对生物体施加氧化应激的应用。大多数射流使用稀有气体，但一些研究人员使用成本较低的氮气。已发现原料气的含水量（湿度）会影响稀有气体等离子体射流的性能，但对于使用氮气的射流尚未进行系统研究。
在氮气等离子体射流中使用低湿度和高湿度的原料气，并使用一种名为FBX（硫酸亚铁 - 苯甲酸 - 二甲酚橙）的化学剂量计定量测量射流的氧化效果。
与向FBX剂量计中添加定量过氧化氢相比，发现使用高湿度原料气的等离子体射流的氧化效果约为低湿度射流的十倍。
以氮气作为原料气的大气压等离子体射流，在原料气中添加高水平湿度时具有更大的氧化效果。
