Molecular Species Generated by Surface Dielectric Barrier Discharge Micro-plasma in Small Chambers Enclosing Atmospheric
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Molecular Species Generated by Surface Dielectric Barrier Discharge Micro‑plasma in Small Chambers Enclosing Atmospheric Air and Water Samples A. Dascalu1 · V. Pohoata1 · K. Shimizu2 · L. Sirghi1 Received: 16 April 2020 / Accepted: 28 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In many applications of the atmospheric pressure plasmas, the plasma is generated in chambers that enclose samples to be treated. In the case of plasma treatments of water or water-containing materials, the humidity in gaseous medium rises during the treatment, and this affects considerably the plasma generation of reactive oxygen and nitrogen species (RONS). In this study, Fourier transform infrared absorption spectroscopy is used to investigate the kinetics of reactive species generated by surface dielectric barrier (SDBD) micro-plasma in a small volume of atmospheric air (0.5 L) enclosed in a discharge chamber. The investigations were made for dry air (in absence of liquid water) and for humid air in presence of liquid water. The SDBD plasma contributes to desorption of water from the inner wall of the discharge chamber and enhances evaporation of liquid water, which increases air humidity and decreases the generation rates of reactive species. Kinetics of RONS generated in small samples of liquid water in contact with discharge medium is investigated by ex situ UV absorption spectroscopy measurements of plasma treated water. Keywords Atmospheric pressure plasma · Plasma generated reactive species · Fourier transform infrared absorption spectroscopy · UV absorption spectroscopy · Plasma activated water
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1109 0-020-10122-x) contains supplementary material, which is available to authorized users. * L. Sirghi [email protected] 1
Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Blvd. Carol I nr. 11, Iasi 700506, Romania
2
Organization for Innovation and Social Collaboration, Shizuoka University, 3‑5‑1, Naka‑ku, Johoku, Hamamatsu, Shizuoka 432‑8561, Japan
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Plasma Chemistry and Plasma Processing
Introduction Atmospheric pressure plasmas in ambient air are intensely studied for their applications in surface treatments [1], bio decontamination [2], plasma medicine [3, 4], and treatments of biologic fluids [5] and water [6]. Particularly, surface dielectric barrier discharge (SDBD) plasma is a handy and low-cost atmospheric-pressure plasma source, which is scalable for either small devices used in laboratory research or medical applications to large industrial applications [7]. For example, the SDBD micro-plasma generated on dielectric surface of small devices was used to treat skin for local enhancement of permeability to drugs [8], ozone reactor for air treatment [9] or for removal of organic chemical pollutants from water [10]. In these experiments, SDBD plasma generates primary reactive oxygen and nitrogen species
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