The influence of water vapor content on electrical and spectral properties of an atmospheric pressure plasma jet

Abstract

An atmospheric pressure plasma jet generated in Ar with water vapor is investigated. It is shown that an increase in the water content results in a decrease in the input power and asymmetry of the current waveform on positive and negative half-periods of the applied voltage. Space-resolved spectroscopy with a resolution of 1 mm and an imaging technique are applied for the characterization of the afterglow and investigation of the influence of water content on plasma properties. The rotational temperature of the jet is determined by simulation of the OH radical emission spectrum, transition A 2 + (v = 0) → X 2 (v = 0). It is revealed that the temperature of the discharge increases from 450 K (Ar) up to 850 K with an increase in the water content up to 7600 ppm. Generation of the discharge in mixtures of argon with water vapor at a concentration of 350 ppm results in a maximal yield of OH radicals that can be useful in plasma jet applications. Preliminary tests of polypropylene surface modification are carried out in order to estimate the influence of water content on the results of treatment.

Influence of Water Vapor Addition on the Surface Modification of Polyethylene in an Argon Dielectric Barrier Discharge

“…Moreover, the peak values of the current pulses increase and the pulse duration decreases with increasing water content in the gas mixture, while no significant changes in the applied high voltage can be seen. These observations are in close accordance with the results obtained by Nikiforov who studied the influence of water vapor content on the electrical properties of an atmospheric pressure plasma jet . As a result of the increasing pulses, the discharge power tends to increase from approximately 5 to 8 W with increasing water vapor content.…”

Comparison of two cold atmospheric pressure plasma jet configurations in argon

“…This is in accordance with previous studies of Ar plasma jets ignited with kHz frequency sinusoidal voltage. According to other studies with various CAPJ configurations, CAPJ I could be sustained at considerably lower voltages in the range of 1-4 kV [27,39,40] when compared to the CAPJ II with sustaining voltages in the range of 7-10 kV. [32,41] Somewhat higher sustaining voltages for CAPJ II obtained in present study may be explained by the smaller dielectric tube diameter.…”

Low temperature plasma induced apoptosis in CNE‐2Z cells through endoplasmic reticulum stress and mitochondrial dysfunction pathways

“…The advantages of LTP are that large and expensive vacuum equipment can be omitted and high reactive species density can be achieved due to the high density under ambient conditions without significant thermal damage . The effect of LTP on the organism is comprehensive under the effects of various kinds of free radicals, the charged particles, ultraviolet, and excited states of particles on the organism . The composition and content of active components in the LTP can be controlled by adjusting the discharge parameters and the dose of plasma.…”

“…[4] The effect of LTP on the organism is comprehensive under the effects of various kinds of free radicals, the charged particles, ultraviolet, and excited states of particles on the organism. [5][6][7] The composition and content of active components in the LTP can be controlled by adjusting the discharge parameters and the dose of plasma. Among these active components, reactive oxygen species (ROS) and reactive nitrogen species (RNS) such as NO, NO 2 , O 3 , OH, H 2 O 2 , [8,9] are reported to contribute to LTP-induced cell death and other effects.…”