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Division of Environmental Physics - User: igor
Faculty of Mathematics, Physics and Informatics, Comenius University Bratislava


Air spark-like plasma source for antimicrobial NOx generation

Pavlovich M J, Ono T, Galleher C, Curtis B, Clark D S, Machala Z and Graves D B
J. Phys. D: Appl. Phys. 47, 505202 (10pp) (2014)

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Abstract:

We demonstrate and analyse the generation of nitrogen oxides and their antimicrobial efficacy using atmospheric air spark-like plasmas. Spark-like discharges in air in a 1 L confined volume are shown to generate NOx at an initial rate of about 1.5 × 1016 NOx molecules/J dissipated in the plasma. Such a discharge operating in this confined volume generates on the order of 6000 ppm NOx in 10 min. Around 90% of the NOx is in the form of NO2 after several minutes of operation in the confined volume, suggesting that NO2 is the dominant antimicrobial component. The strong antimicrobial action of the NOx mixture after several minutes of plasma operation is demonstrated by measuring rates of E. coli disinfection on surfaces and in water exposed to the NOx mixture. Some possible applications of plasma generation of NOx (perhaps followed by dissolution in water) include disinfection of surfaces, skin or wound
antisepsis, and sterilization of medical instruments at or near room temperature.


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