NDLI: Afterglow chemistry of air operated non-thermal plasma jet

Content Provider	IEEE Xplore Digital Library
Author	Hao, X.L. Mattson, A. Edelblute, C. Amaismeier, V. Malik, M.A. Heller, L.C. Kolb, J.F.
Copyright Year	2011
Description	Author affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China (Hao, X.L.) \|\| Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, VA, 23508, USA (Mattson, A.; Edelblute, C.; Amaismeier, V.; Malik, M.A.; Heller, L.C.; Kolb, J.F.)
Abstract	We have recently presented a microplasma jet, which is operated with ambient air at atmospheric $pressure^{1}.$ The plasma is sustained in a microhollow cathode geometry when applying a dc voltage of about 2 kV to electrodes that are approximately 0.4 mm apart. By flowing air through the discharge, an afterglow plasma plume is expelled through a sub-millimeter-diameter orifice. Temperature distributions in the jet can be controlled by gas flow rates and, with values close to room temperature, are cold enough for the jet to be used for the sterilization of wounds. Accordingly, we have successfully tested the efficacy against different pathogens. Microorganisms such as Candida kefyr are effectively eradicated at distance of several tens of millimeters from the discharge. Chemical species that are generated in the discharge and in subsequent reactions of the afterglow with ambient air are primarily responsible for the efficacy of the method. We have investigated and quantified chemical processes mediated by the jet with respect to operating parameters and focused particularly on the effect of flow rates (0.25–8 slm), discharge currents (i.e. energy input into the plasma), and the difference between dry and humid air supplied to the discharge. The plasma was ejected into a closed, but not sealed, reactor of about 0.25-liter in volume. Air from this containment was sampled, and the development of concentrations of different gaseous species was recorded over time. We found that NO was the dominant reaction product with concentrations reaching several hundreds of ppm. In comparison, concentrations of NO and O were negligible. The concentrations of NO were increasing with increasing applied power but decreasing with increasing flow rates. Simultaneously, NO concentrations were increasing slightly. Operation with humid air also led to a small but noticeable increase of NO concentrations, but still at much lower levels than NO concentrations. The results suggest that primarily nitric oxide is generated, which therefore may account for the microbicidal effect of the plasma jet, in addition to the possible contribution of short-lived species, such as atomic oxygen and hydroxyl radicals. The production rates of the latter have yet to be studied in more detail.
Starting Page	1
Ending Page	1
File Size	69607
Page Count	1
File Format	PDF
ISBN	9781612843308
ISSN	07309244
e-ISBN	9781612843292
e-ISBN	9781612843285
DOI	10.1109/PLASMA.2011.5993208
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Plasmas
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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