Experimental study compares reactive species in a nitrogen-dominated plasma jet and an ozone-producing dielectric barrier discharge, suggesting temperature impacts composition.
In this work, the reactive species generated by two different plasma jet devices operated with ambient air as working gas are studied experimentally and theoretically. One jet device is based in a non-thermal arc, while the other consists of a dielectric barrier discharge (DBD) with two axial electrodes and a double dielectric barrier. The reactive oxygen and nitrogen species present in the jet effluents were measured by Fourier transform infrared absorption spectroscopy (FT-IR). A very different composition of reactive species was found for the two devices. The arc plasma jet has a chemistry dominated by nitrogen reactive species, while the DBD produces mainly ozone. The gas temperature in the discharge region of the two jets was determined by fitting the emission spectrum of the second positive N2 system. It was found that the neutral gas temperature in the arc jet is significantly higher than in the DBD jet. The chemical composition in the discharge region was studied with a theoretical model that considers multiple chemical reactions, taking into account the gas temperature dependence of the reaction rates. It was observed that most of the species identified by FT-IR are predicted by the theoretical model as the most abundant in the discharge region. This result indicates that the chemical composition of the jet effluents is determined by the gas temperature in the discharge region.
No takes yet. Share an insight, caveat, or question.
Xaubet et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: