Mass Spectrometric Observations of the Ionic Species in a Double Dielectric Barrier Discharge Operating in Nitrogen

Abd‐Allah, Zaenab; Sawtell, David; West, G.T.; Kelly, Peter; Bradley, James W.

doi:10.1002/ppap.201500149

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Molecular beam mass spectrometry enables the in situ detection of negative and positive ions from DBDs and the study of the ionic chemistry. In case of water vapor admixture or impurities cluster ions are measured [198,199].…”

Section: Methods and Techniquesmentioning

confidence: 99%

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Brandenburg

2017

Plasma Sources Sci. Technol.

620

424

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Dielectric barrier discharges (DBDs) are plasmas generated in configurations with an insulating (dielectric) material between the electrodes which is responsible for a self-pulsing operation. DBDs are a typical example of nonthermal atmospheric or normal pressure gas discharges. Initially used for the generation of ozone, they have opened up many other fields of application. Therefore DBDs are a relevant tool in current plasma technology as well as an object for fundamental studies. Another motivation for further research is the fact that so-called partial discharges in insulated high voltage systems are special types of DBDs. The breakdown processes, the formation of structures, and the role of surface processes are currently under investigation. This review is intended to give an update to the already existing literature on DBDs considering the research and development within the last two decades. The main principles and different modes of discharge generation are summarized. A collection of known as well as special electrode configurations and reactor designs will be presented. This shall demonstrate the different and broad possibilities, but also the similarities and common aspects of devices for different fields of applications explored within the last years. The main part is devoted to the progress on the investigation of different aspects of breakdown and plasma formation with the focus on single filaments or microdischarges. This includes a summary of the current knowledge on the electrical characterization of filamentary DBDs. In particular, the recent new insights on the elementary volume and surface memory mechanisms in these discharges will be discussed. An outlook for the forthcoming challenges on research and development will be given.

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Section: Methods and Techniquesmentioning

confidence: 99%

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Brandenburg

2017

Plasma Sources Sci. Technol.

620

424

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“…It perhaps indicates why there is also a plateau in Figure a,b as the amorphous regions react rapidly, leaving the outer surfaces of the lamellae to react more slowly, reducing the rate of formation of carbonyl and amide groups vastly. Although the adsorbed oxygen is likely to be rapidly used up in the initial scission process within the amorphous regions, previous work by the authors has shown that trace amounts of oxygen present in the gas from possible leaks or impurities in the gas will form reactive oxygen species, which will react with the surface of the BOPP film and provide the source of oxygen for the functional groups on the surface.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms of atmospheric pressure plasma treatment of BOPP

Sawtell

Abd‐Allah

Bradley

et al. 2017

Plasma Processes & Polymers

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Surface energy increase of polymers with plasma treatment is an industrially significant process. The mechanisms behind this process are little understood, with work addressing the water contact angle decrease with treatment and changes in surface chemistry. Work presented here addresses the mechanism of this surface energy increase, by using crystalline biaxially orientated polypropylene (BOPP) films to identify plasma induced structural changes. Increased crystallinity of the BOPP films were observed by ATR-FTIR spectroscopy, indicating preferential oxidation of amorphous regions of the BOPP films by the plasma. This crystal structure change correlates with XRD peak shifts, implying relaxation of crystal regions into regions previously occupied by amorphous BOPP. The trend in surface energy increases also correlates with the effective increase in crystallinity.

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“…The investigation of the gas-phase plasma is widely performed using various analytical techniques, including optical emission spectroscopy, laser induced fluorescence, infrared spectroscopy, mass spectrometry (MS), etc. [10][11][12] . At the same time, detailed investigations of the species detected in the liquid phase are still scarce.…”

Section: Introductionmentioning

confidence: 99%

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

Gorbanev

Soriano

O’Connell

et al. 2016

JoVE

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Non-thermal atmospheric pressure ('cold') plasmas have received increased attention in recent years due to their significant biomedical potential. The reactions of cold plasma with the surrounding atmosphere yield a variety of reactive species, which can define its effectiveness. While efficient development of cold plasma therapy requires kinetic models, model benchmarking needs empirical data. Experimental studies of the source of reactive species detected in aqueous solutions exposed to plasma are still scarce. Biomedical plasma is often operated with He or Ar feed gas, and a specific interest lies in investigation of the reactive species generated by plasma with various gas admixtures (O 2 , N 2 , air, H 2 O vapor, etc.) Such investigations are very complex due to difficulties in controlling the ambient atmosphere in contact with the plasma effluent. In this work, we addressed common issues of 'high' voltage kHz frequency driven plasma jet experimental studies. A reactor was developed allowing the exclusion of ambient atmosphere from the plasma-liquid system. The system thus comprised the feed gas with admixtures and the components of the liquid sample. This controlled atmosphere allowed the investigation of the source of the reactive oxygen species induced in aqueous solutions by He-water vapor plasma. The use of isotopically labelled water allowed distinguishing between the species originating in the gas phase and those formed in the liquid. The plasma equipment was contained inside a Faraday cage to eliminate possible influence of any external field. The setup is versatile and can aid in further understanding the cold plasma-liquid interactions chemistry.

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Mass Spectrometric Observations of the Ionic Species in a Double Dielectric Barrier Discharge Operating in Nitrogen

Cited by 6 publications

References 12 publications

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Dielectric barrier discharges: progress on plasma sources and on the understanding of regimes and single filaments

Mechanisms of atmospheric pressure plasma treatment of BOPP

An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

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