skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Investigation on the reaction mechanisms of generation and loss of oxygen-related species in atmospheric-pressure pulsed dielectric barrier discharge in argon/oxygen mixture

Abstract

This work presents a numerical investigation, using a 1-D fluid model, on the generation and loss of oxygen-related species and the spatial-temporal evolutions of the species densities in the atmospheric-pressure pulsed dielectric barrier discharge in the argon/oxygen mixture. The reaction pathways as well as their contributions to the generation and loss of oxygen-related species are given. The considered oxygen-related species include O, O({sup 1}D), O{sub 2}({sup 1}Δ{sub g}), O{sub 3}, O{sup +}, O{sub 2}{sup +}, O{sup −}, O{sub 2}{sup −}, and O{sub 3}{sup −}. The following significant results are obtained. O, O({sup 1}D), O{sub 2}({sup 1}Δ{sub g}), and O{sup −} are produced mainly via the electron impact with O{sub 2}. Ar{sup +} plays an essential role in the generation of O{sup +} and O{sub 2}{sup +}. Almost all of O{sub 3} derives from the reaction O{sub 2} + O{sub 2} + O → O{sub 3} + O{sub 2}. The O{sub 3}-related reactions produce an essential proportion of O{sub 2}{sup −} and O{sub 3}{sup −}. The substantial loss of O{sup −}, O{sub 2}{sup −}, and O{sub 3}{sup −} is induced by their reactions with O{sub 2}{sup +}. Loss of O{sup +}, O, and O({sup 1}D) is mainly due to their reactionsmore » with O{sub 2}, loss of O{sub 2}({sup 1}Δ{sub g}) due to O{sub 2}({sup 1}Δ{sub g}) impacts with O{sub 3} as well as the de-excitation reactions between O{sub 2}({sup 1}Δ{sub g}) and e, O{sub 2}, and O, and loss of O{sub 3} due to the reactions between O{sub 3} and other neutral species. In addition, the densities of O{sup +} and O({sup 1}D) present two obvious peaks at the pulse duration, but the densities of O{sub 2}{sup +}, O, O{sub 2}({sup 1}Δ{sub g}), and O{sub 3} are almost unchanged. The densities of negative oxygen ions increase at the pulse duration and then decline. O{sup −} density is obviously large nearby the dielectric surfaces and the densities of O{sub 2}{sup −} and O{sub 3}{sup −} present generally uniform distributions.« less

Authors:
; ; ; ; ; ;  [1]
  1. School of Electrical Engineering, Shandong University, Jinan 250061 (China)
Publication Date:
OSTI Identifier:
22599971
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARGON; ARGON IONS; ATMOSPHERIC PRESSURE; DE-EXCITATION; DENSITY; DIELECTRIC MATERIALS; DISTRIBUTION; ELECTRONS; MIXTURES; NUMERICAL ANALYSIS; ONE-DIMENSIONAL CALCULATIONS; OXYGEN; OXYGEN IONS; PULSES; REACTION KINETICS; SURFACES

Citation Formats

Pan, Jie, Tan, Zhenyu, E-mail: tzy@sdu.edu.cn, Pan, Guangsheng, Shan, Chunhong, Wang, Xiaolong, Liu, Yadi, and Jiang, Jixiang. Investigation on the reaction mechanisms of generation and loss of oxygen-related species in atmospheric-pressure pulsed dielectric barrier discharge in argon/oxygen mixture. United States: N. p., 2016. Web. doi:10.1063/1.4960119.
Pan, Jie, Tan, Zhenyu, E-mail: tzy@sdu.edu.cn, Pan, Guangsheng, Shan, Chunhong, Wang, Xiaolong, Liu, Yadi, & Jiang, Jixiang. Investigation on the reaction mechanisms of generation and loss of oxygen-related species in atmospheric-pressure pulsed dielectric barrier discharge in argon/oxygen mixture. United States. doi:10.1063/1.4960119.
Pan, Jie, Tan, Zhenyu, E-mail: tzy@sdu.edu.cn, Pan, Guangsheng, Shan, Chunhong, Wang, Xiaolong, Liu, Yadi, and Jiang, Jixiang. 2016. "Investigation on the reaction mechanisms of generation and loss of oxygen-related species in atmospheric-pressure pulsed dielectric barrier discharge in argon/oxygen mixture". United States. doi:10.1063/1.4960119.
@article{osti_22599971,
title = {Investigation on the reaction mechanisms of generation and loss of oxygen-related species in atmospheric-pressure pulsed dielectric barrier discharge in argon/oxygen mixture},
author = {Pan, Jie and Tan, Zhenyu, E-mail: tzy@sdu.edu.cn and Pan, Guangsheng and Shan, Chunhong and Wang, Xiaolong and Liu, Yadi and Jiang, Jixiang},
abstractNote = {This work presents a numerical investigation, using a 1-D fluid model, on the generation and loss of oxygen-related species and the spatial-temporal evolutions of the species densities in the atmospheric-pressure pulsed dielectric barrier discharge in the argon/oxygen mixture. The reaction pathways as well as their contributions to the generation and loss of oxygen-related species are given. The considered oxygen-related species include O, O({sup 1}D), O{sub 2}({sup 1}Δ{sub g}), O{sub 3}, O{sup +}, O{sub 2}{sup +}, O{sup −}, O{sub 2}{sup −}, and O{sub 3}{sup −}. The following significant results are obtained. O, O({sup 1}D), O{sub 2}({sup 1}Δ{sub g}), and O{sup −} are produced mainly via the electron impact with O{sub 2}. Ar{sup +} plays an essential role in the generation of O{sup +} and O{sub 2}{sup +}. Almost all of O{sub 3} derives from the reaction O{sub 2} + O{sub 2} + O → O{sub 3} + O{sub 2}. The O{sub 3}-related reactions produce an essential proportion of O{sub 2}{sup −} and O{sub 3}{sup −}. The substantial loss of O{sup −}, O{sub 2}{sup −}, and O{sub 3}{sup −} is induced by their reactions with O{sub 2}{sup +}. Loss of O{sup +}, O, and O({sup 1}D) is mainly due to their reactions with O{sub 2}, loss of O{sub 2}({sup 1}Δ{sub g}) due to O{sub 2}({sup 1}Δ{sub g}) impacts with O{sub 3} as well as the de-excitation reactions between O{sub 2}({sup 1}Δ{sub g}) and e, O{sub 2}, and O, and loss of O{sub 3} due to the reactions between O{sub 3} and other neutral species. In addition, the densities of O{sup +} and O({sup 1}D) present two obvious peaks at the pulse duration, but the densities of O{sub 2}{sup +}, O, O{sub 2}({sup 1}Δ{sub g}), and O{sub 3} are almost unchanged. The densities of negative oxygen ions increase at the pulse duration and then decline. O{sup −} density is obviously large nearby the dielectric surfaces and the densities of O{sub 2}{sup −} and O{sub 3}{sup −} present generally uniform distributions.},
doi = {10.1063/1.4960119},
journal = {Physics of Plasmas},
number = 7,
volume = 23,
place = {United States},
year = 2016,
month = 7
}
  • One of the attractive features of nonthermal atmospheric pressure plasmas is the ability to achieve enhanced gas phase chemistry without the need for elevated gas temperatures. This attractive characteristic recently led to their extensive use in applications that require low temperatures, such as material processing and biomedical applications. The agents responsible for the efficient plasma reactivity are the ultraviolet (UV) photons and the chemically reactive species. In this paper, in order to optimize the UV radiation and reactive species generation efficiency, the plasma was generated by a dielectric barrier discharge driven by unipolar submicrosecond square pulses. To keep the dischargemore » diffuse and to maintain low operating temperatures, helium (He) was used as a carrier gas. Mixed with helium, varying amounts of nitrogen (N{sub 2}) with the presence of trace amounts of air were used. The gas temperature was determined to be about 350 K at a 1-kHz pulse frequency for all cases and only slightly increased with frequency. The UV emission power density, P{sub UV}, reached its highest level when 5% to 10% of N{sub 2} is mixed to a balance of He. A maximum P{sub UV} of about 0.8 mW/cm{sup 2} at 10-kHz pulse frequency for a He(90%)+N{sub 2}(10%) mixture was measured. This was more than four times higher than that when He or N{sub 2} alone was used. Furthermore, the emission spectra showed that most of the UV was emitted by excited NO radicals, where the oxygen atoms came from residual trace amounts of air. In addition to NO, NO{sub 2}, and excited N{sub 2}, N{sub 2}{sup +}, OH, and He were also present in the plasma.« less
  • Thin films of polypropylene (PP) are treated for improving hydrophilicity using non-thermal plasma generated by 50 Hz line frequency dielectric barrier discharge produced in air and argon/air mixture at atmospheric pressure. PP samples before and after the treatments are studied using contact angle measurements, surface free energy calculations and scanning electron microscopy (SEM). Distilled water (H{sub 2}O), glycerol (C{sub 3}H{sub 8}O{sub 3}) and diiodomethane (CH{sub 2}I{sub 2}) are used as test liquids. The contact angle measurements between test liquids and PP samples are used to determine total surface free energy using sessile drop technique. PP films show a remarkable increase inmore » surface free energy after plasma treatment. SEM analysis of the plasma-treated PP films shows that plasma treatment introduces greater roughness on the surface leading to the increased surface free energy. Furthermore, it is found that introducing a small quantity of argon can enhance the surface treatment remarkably.« less
  • The authors have quantified the effect of pressure scaling on Ar metastable production efficiency in a dielectric barrier discharge with and without dielectric component losses. Estimates of the volume averaged deposited energy were performed for both short or long rise time voltage pulses, using the same total applied voltages of {approx}10 and {approx}150 ns, respectively. The metastable production efficiencies of long-pulse discharge exhibit smaller decrease over the 100-500 Torr pressure range, compared to those of the short-pulse one to the extent that the efficiency values and scaling for both cases are essentially the same within the experimental uncertainty.
  • In this study, the ion densities of an ac dielectric barrier discharge (DBD) (that is, a pin-to-plate DBD) as a function of the applied frequency in argon have been studied by means of the plasma radiation. The pin-to-plate DBD shows the characteristic of radiation oscillations with a low-frequency wave hidden in a high-frequency wave to form a mosaic structure, which reveals the coexistence of two discharge modes in the ac barrier discharge, i.e., the streamer mode and the corona mode. According to the oscillation frequencies, the ion densities are calculated. The results show that the ion density in streamer dischargemore » is higher than that in corona discharge for about 1-2 magnitude orders.« less
  • A stable diffuse large-volume air plasma source was developed by using argon-induced dielectric-barrier discharges at atmospheric pressure. This plasma source can be operated in a filamentary discharge with the average areal power density of 0.27 W/cm{sup 2} and the gas temperature of 315{+-}3 K. Spatial measurement of emission spectrum and temperature indicates that this plasma is uniform in the central region along the transverse direction. It is also found that the formation of diffuse air plasma mainly lies in the creation of sufficient seed electrons by the Penning effect through collisions between two argon or nitrogen metastables at low electricmore » fields.« less