Behaviour of OH radicals in an atmospheric-pressure streamer discharge studied by two-dimensional numerical simulation

Komuro, Atsushi; Ono, Ryo; Oda, Tetsuji

doi:10.1088/0022-3727/46/17/175206

Cited by 105 publications

(94 citation statements)

References 78 publications

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“…T g ≈ 300 K. The reaction rate with O( 1 D) for OH production is much higher than those of electron or metastable dissociation of H 2 O [40] and thus enhances OH production in the afterglow of the plasma jet in ambient air. Similar to reaction (R 21 ), a mechanism has been proposed in [41] for the generation of O: However, because of air diffusion into the jet, the active species map has to follow a 'donut'-like distribution, with higher intensity on the edges, due to the profile of N 2 , H 2 O and O 2 densities in the afterglow.…”

Section: Discussionmentioning

confidence: 99%

“…This means that the influence of air impurities on the production of active species in the core of the plasma has to be considered. Komuro et al [40] found that dissociation of H 2 O by O( 1 D) and N 2 (A) is predominant in the production of OH in a streamer discharge in humid air. In that case, the following mechanisms can lead to additional formation of OH radicals in the afterglow [25,41]:…”

Section: Discussionmentioning

confidence: 99%

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Influence of air diffusion on the OH radicals and atomic O distribution in an atmospheric Ar (bio)plasma jet

Nikiforov

Britun

et al. 2014

Plasma Sources Sci. Technol.

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Treatment of samples with plasmas in biomedical applications often occurs in ambient air. Admixing air into the discharge region may severely affect the formation and destruction of the generated oxidative species. Little is known about the effects of air diffusion on the spatial distribution of OH radicals and O atoms in the afterglow of atmospheric-pressure plasma jets. In our work, these effects are investigated by performing and comparing measurements in ambient air with measurements in a controlled argon atmosphere without the admixture of air, for an argon plasma jet. The spatial distribution of OH is detected by means of laser-induced fluorescence diagnostics (LIF), whereas two-photon laser-induced fluorescence (TALIF) is used for the detection of atomic O. The spatially resolved OH LIF and O TALIF show that, due to the air admixture effects, the reactive species are only concentrated in the vicinity of the central streamline of the afterglow of the jet, with a characteristic discharge diameter of ∼1.5 mm. It is shown that air diffusion has a key role in the recombination loss mechanisms of OH radicals and atomic O especially in the far afterglow region, starting up to ∼4 mm from the nozzle outlet at a low water/oxygen concentration. Furthermore, air diffusion enhances OH and O production in the core of the plasma. The higher density of active species in the discharge in ambient air is likely due to a higher electron density and a more effective electron impact dissociation of H 2 O and O 2 caused by the increasing electrical field, when the discharge is operated in ambient air.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Influence of air diffusion on the OH radicals and atomic O distribution in an atmospheric Ar (bio)plasma jet

Nikiforov

Britun

et al. 2014

Plasma Sources Sci. Technol.

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“…1 The OH radicals are produced via diverse routes in gas phase, electron impact dissociation of H 2 O molecules, the reactions of O ( 1 D) and N 2 (A) with H 2 O molecules, the Penning and charge transfer reactions of H 2 O molecules with excited species. 6,8,9 In liquid phase, they are produced in the pathway starting from superoxide anion and/or by dissociation of vibrationally excited water through collision with ground state water. 10 Measuring the absolute density of OH species will improve the determination of treatment doses and allow for optimization of the plasma process for a specific application.…”

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confidence: 99%

Plasma effects on the generation of reactive oxygen and nitrogen species in cancer cells in-vitro exposed by atmospheric pressure pulsed plasma jets

Kim

Chung

2015

Applied Physics Letters

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Atmospheric pressure pulsed helium plasma jets are utilized for plasma-cell interactions. The effect of operating parameters such as applied voltage, pulse repetition frequency, and duty ratio on the generation of specific reactive oxygen and nitrogen species in gas and liquid phases and within cells is investigated. The apoptotic changes detected by terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick-end labeling assay in cells caused by plasma exposure are observed to correlate well with the levels of extracellular and intracellular reactive oxygen and nitrogen species.

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“…The model used here is a first-order electrohydrodynamic model for electrons and ions in the framework of the driftdiffusion approximation [2]. The simulations are performed in a 13-mm-gap point-to-plane electrode configuration according to our experimental setup.…”

mentioning

confidence: 99%

“…We used a reduced reaction model including electron impact reactions (excitation, ionization, dissociation, recombination, attachment and detachment), ion recombination, and the reactions of neutrals. A detailed description of the chemical reaction model is given in [2]. The rate constants of electron impact reactions are calculated by the analysis of the Boltzmann's equation.…”

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confidence: 99%

Simulated Streak Pictures for the Production of Chemical Species in an Atmospheric Pressure Streamer Discharge

Komuro

Ono

2014

IEEE Trans. Plasma Sci.

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A streamer discharge model is developed to analyze the characteristics of a pulsed positive streamer discharge for point-to-plane electrodes filled with humid air at atmospheric pressure. The process of chemical species production is studied using simulated streak pictures. The streak pictures clearly show that the primary streamer and secondary streamer have different roles for charged-particle production and subsequent activespecies production.

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Behaviour of OH radicals in an atmospheric-pressure streamer discharge studied by two-dimensional numerical simulation

Cited by 105 publications

References 78 publications

Influence of air diffusion on the OH radicals and atomic O distribution in an atmospheric Ar (bio)plasma jet

Influence of air diffusion on the OH radicals and atomic O distribution in an atmospheric Ar (bio)plasma jet

Plasma effects on the generation of reactive oxygen and nitrogen species in cancer cells in-vitro exposed by atmospheric pressure pulsed plasma jets

Simulated Streak Pictures for the Production of Chemical Species in an Atmospheric Pressure Streamer Discharge

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