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Plasma Medicine
SJR: 0.278 SNIP: 0.183 CiteScore™: 0.57

ISSN 印刷: 1947-5764
ISSN オンライン: 1947-5772

Plasma Medicine

DOI: 10.1615/PlasmaMed.2018019459
pages 395-406

Surface Dielectric Barrier Discharge in Closed-Volume Air

A. Dascalu
Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
A. Demeter
Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
F. Samoila
Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
V. Anita
Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania
Kazuo Shimizu
Organization for Innovation and Social Collaboration, Shizuoka University, 3-5-1 Johoku, Hamamatsu, 4328561, Japan
Lucel Sirghi
Iasi Plasma Advanced Research Center (IPARC), Faculty of Physics, Alexandru Ioan Cuza University, Iasi, 700506, Romania

要約

The postdischarge kinetics of reactive species produced by a surface dielectric barrier discharge (SDBD) ignited in closed-volume air for decomposition of organic molecules in aqueous solutions was investigated. A SDBD with surface of 6 cm2 was operated in a closed volume (0.5 L) of air at atmospheric pressure. The voltage across the plasma gap, the charge transferred through the plasma, and the dissipated power were computed from the charge-voltage diagram to values of 3900V, 0.2 μC, and 6W, respectively. The reactive species produced by the SDBD in a closed volume of air were active for decomposition of methylene blue molecules in small volumes of aqueous solution for a relatively long period of time after the discharge was cut off. The lifetime in gaseous phase of the species active for decomposition of organic molecules was approximately 11 minutes. However, SDBD operation in closed-volume air shortened the lifetime of polyimide dielectric of the discharge microelec-trode system due to the increased humidity and reactivity of the active species generated by plasma. Measurement of relative humidity revealed that the discharge enhanced water evaporation. Atomic force microscopy investigations of dielectric surface in the discharge region revealed drastic modifications of surface morphology with an important increase of surface roughness as the result of SDBD operation.