Application of Y–ZrO2 microtubes as dielectric barrier material in a He atmospheric pressure micro-plasma jet

Talviste, Rasmus; Jõgi, Indrek; Tätte, Tanel; Part, Marko; Raud, Jüri; Paris, P.

doi:10.1007/s42452-020-03981-8

Cited by 3 publications

(2 citation statements)

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“…The primary motivation lies in the applicability of APPJs in biomedicine [5][6][7][8][9][10][11] where it is imperative that factors affecting the plasma properties and the production of reactive oxygen and nitrogen species (RONS) [12] are known. APPJs excited with kHz frequency pulsed or sinusoidal voltage are operated in a stream of noble gas (typically He or Ar) [13,14] and consist of temporally short ionization waves [15][16][17]. There already exists a considerable amount of works on ionization * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of first Townsend ionization coefficient in mixtures of He and N₂

Talviste

Paris

Raud

et al. 2021

J. Phys. D: Appl. Phys.

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First Townsend ionization coefficient α in gas mixture of He with N2 is relevant for modeling of the development and chemical activity of atmospheric pressure plasma jets. This study determined α from measurements of current versus electrode separation in a steady-state non-self-sustaining Townsend discharge set-up. The measurements were carried out in absolute pressure range of 10–800 Torr and reduced electric field E/N range of 20–1000 Td. The effect of the N2 concentration in the gas mixture on the density normalized ionization coefficient α/N depended on the reduced electric field strength E/N. At E/N values below 200 Td, increased N2 content reduced the α/N while at E/N values above 200 Td, increased N2 content increased the plateau value of α/N. Reasonably good coincidence was observed between calculation performed with Bolsig+ and measured α/N. The discrepancy between experimental results and calculations at N2 percentage in the mixture below 5% and E/N values below 200 Td can be attributed to the Penning effect.

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Section: Introductionmentioning

confidence: 99%

Experimental determination of first Townsend ionization coefficient in mixtures of He and N₂

Talviste

Paris

Raud

et al. 2021

J. Phys. D: Appl. Phys.

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“…There exists an extensive amount of data on APPJs operated in stream of noble gas (typically Ar or He) exiting into ambient air [23][24][25]. However, some key characteristics of APPJs e.g.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the first Townsend ionization coefficient in mixtures of Ar and N₂

Talviste¹,

Paris²,

Raud³

et al. 2021

J. Phys. D: Appl. Phys.

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Mixtures of Ar with N 2 are relevant for many areas of plasma applications. In particular, modeling of atmospheric pressure plasma jets for biomedical applications requires precise knowledge of fundamental gas parameters such as the Townsend ionization coefficient α. This study determines α in mixtures of Ar with N 2 in a dark non-self-sustaining Townsend discharge. The discharge current versus electrode spacing was measured in the absolute pressure range of 10-800 Torr and reduced electric field strength E/N range of 40-1000 Td. The density normalized ionization coefficient α/N increases with E/N and decreased with N 2 content in the gas mixture. A good coincidence between measurements and calculations with Bolsig+ was observed. In case when N 2 concentration was between 10% and 50% in the mixture, experimental results were 20%-30% lower than predicted by Bolsig+ calculations. The results of this work were compared with α/N determined in mixtures of He with up to 10% of N 2

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Effective ionization coefficient in mixtures of Ar and O2 determined using the Townsend discharge

et al. 2022

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Precise knowledge of the fundamental ionization properties of gases, such as the effective ionization coefficient, is crucial for discharges in mixtures of Ar:O2, which are significant for a wide range of plasma applications. This study determined the effective ionization coefficient in electronegative gas mixtures of Ar:O2 in the pressure range of 10–800 Torr and reduced electric field strength E/ N range of 40–1200 Td utilizing a steady-state non-self-sustaining Townsend discharge. The reduced effective ionization coefficient α e/ N increased with E/ N and decreased with increasing O2 content in the gas mixture. The experimental results were compared with a model which was based on calculating the ionization and attachment coefficients with BOLSIG+. The ion conversion of O− to O2−, detachment from O2−, and formation of O3 were accounted for similarly as has been done with N2:O2 mixtures. Reasonably good agreement between the measurements and the model calculations was achieved for Ar:O2 mixtures with the O2 content between 20% and 70%. A discrepancy of more than 20% between measurement and calculations was observed at low E/ N values when the O2 content was below 20% and at high E/ N values when the O2 content was above 70%. Several possible explanations were proposed for the observed discrepancy; however, more elaborate models are required. The reduced critical electric field E/ N crit, where the apparent effective ionization coefficient is zero, was determined as a function of the O2 content in the Ar:O2 mixtures. E/ N crit increased with increasing O2 content in the mixture.

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Application of Y–ZrO2 microtubes as dielectric barrier material in a He atmospheric pressure micro-plasma jet

Cited by 3 publications

References 50 publications

Experimental determination of first Townsend ionization coefficient in mixtures of He and N₂

Experimental determination of first Townsend ionization coefficient in mixtures of He and N₂

Experimental determination of the first Townsend ionization coefficient in mixtures of Ar and N₂

Effective ionization coefficient in mixtures of Ar and O2 determined using the Townsend discharge

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Application of Y–ZrO2 microtubes as dielectric barrier material in a He atmospheric pressure micro-plasma jet

Cited by 3 publications

References 50 publications

Experimental determination of first Townsend ionization coefficient in mixtures of He and N2

Experimental determination of first Townsend ionization coefficient in mixtures of He and N2

Experimental determination of the first Townsend ionization coefficient in mixtures of Ar and N2

Effective ionization coefficient in mixtures of Ar and O2 determined using the Townsend discharge

Contact Info

Product

Resources

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Experimental determination of first Townsend ionization coefficient in mixtures of He and N₂

Experimental determination of first Townsend ionization coefficient in mixtures of He and N₂

Experimental determination of the first Townsend ionization coefficient in mixtures of Ar and N₂