Abstract
A nonthermal plasma jet is operated at atmospheric pressure inside a vacuum chamber filled with nitrogen gas. Various chemical compounds are fabricated from nitrogen and water molecules in plasma jet with varying oxygen content. Detailed theoretical investigation of these chemical compounds is carried out in terms of different oxygen ratio ξ. Experimental measurements are also carried out for comparison with theoretical results. Hydroxyl molecules are mostly generated at surface of water, and some of them can penetrate into water. The density of hydroxyl molecules has its maximum without oxygen, and decreases to zero as ξ increases to 0.25. The density of the ammonia of NH3 also deceases as ξ increases to 0.25. On the other hand, theory and experiment show that the density of the NO3 increases drastically as ξ increases to 0.25. The hydrogen peroxide density in plasma activated water deceases, reaches its minimum value at ξ = 0.05, and then increases again, as ξ increases from a small value to a large value. The pH value of the plasma activated water, which is slightly changed to alkali without oxygen, decreases as ξ increases.
Highlights
Nonthermal plasma was proposed as a novel therapy for some incurable diseases[1,2,3,4,5,6]
Various chemical species are generated from the N2 plasma jet by changing the O2 content in the plasma
The purpose of this study is the investigation of the influence of O2 on the generation of reactive chemical species from a N2 plasma jet near a water surface
Summary
Nonthermal plasma was proposed as a novel therapy for some incurable diseases[1,2,3,4,5,6]. Plasma activated water/media showed similar anticancer effects as direct nonthermal plasma treatment[7,8] These reports support that those diseases may be cured by long lived ROS/RNS. Though our analysis does not show detail kinetics in a pico second range or detail spatial distributions in a micro meter range as other computational simulation studies, our steady-state solutions are well matched with experimental measurements. This is the first report showing the changes in the chemical species in water according to the O2 mole fraction in N2 plasma in both theoretical and experimental approaches. We calculated the changes in the chemical reactive species in water according to the O2 mole fraction in accordance with experiments
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