Study of an AC dielectric barrier single micro-discharge filament over a water film

In the last decades, AC powered atmospheric dielectric barrier discharges (DBDs) in air with a liquid electrode have been proposed as a promising plasma technology with versatile applicability in medicine, agriculture and water treatment. The fundamental features of the micro-discharge filaments tha...

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Bibliographic Details
Published in:Scientific reports 2018-07, Vol.8 (1), p.10919-11, Article 10919
Main Authors: Vanraes, Patrick, Nikiforov, Anton, Bogaerts, Annemie, Leys, Christophe
Format: Article
Language:English
Subjects:
639/624/1107/527
639/766/1960
Atmospheric pressure
Electrodes
Emission spectroscopy
Filaments
Humanities and Social Sciences
multidisciplinary
Plasma
Science
Science (multidisciplinary)
Spectroscopy
Water treatment
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Summary:In the last decades, AC powered atmospheric dielectric barrier discharges (DBDs) in air with a liquid electrode have been proposed as a promising plasma technology with versatile applicability in medicine, agriculture and water treatment. The fundamental features of the micro-discharge filaments that make up this type of plasma have, however, not been studied yet in sufficient detail. In order to address this need, we investigated a single DBD micro-discharge filament over a water film in a sphere-to-sphere electrode configuration, by means of ICCD imaging and optical emission spectroscopy. When the water film temporarily acts as the cathode, the plasma duration is remarkably long and shows a clear similarity with a resistive barrier discharge, which we attribute to the resistive nature of the water film and the formation of a cathode fall. As another striking difference to DBD with solid electrodes, a constant glow-like plasma is observed at the water surface during the entire duration of the applied voltage cycle, indicating continuous plasma treatment of the liquid. We propose several elementary mechanisms that might underlie the observed unique behavior, based on the specific features of a water electrode.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-29189-w