Effect of water adding on kinetics of barrier discharge in air

Soloshenko, I. A.; Tsiolko, V. V.; Pogulay, S S; Kalyuzhnaya, A. G.; Bazhenov, V. Yu.; Shchedrin, A. I.

doi:10.1088/0963-0252/18/4/045019

Cited by 41 publications

(24 citation statements)

References 40 publications

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“…The line strengths S J 0 J 00 are calculated from Ref. 28 and S t 0 t 00 are the band strengths. Furthermore, considering the non-Gaussian experimental line shape, a contribution of the Lorentzian function is taken into account.…”

Section: Rotational and Vibrational Temperature Measurementsmentioning

confidence: 99%

Optical emission spectroscopic diagnostics of a non-thermal atmospheric pressure helium-oxygen plasma jet for biomedical applications

Thiyagarajan¹,

Sarani²,

Nicula³

2013

Journal of Applied Physics

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In this work, we have applied optical emission spectroscopy diagnostics to investigate the characteristics of a non-thermal atmospheric pressure helium plasma jet. The discharge characteristics in the active and afterglow region of the plasma jet, that are critical for biomedical applications, have been investigated. The voltage-current characteristics of the plasma discharge were analyzed and the average plasma power was measured to be around 18 W. The effect of addition of small fractions of oxygen at 0.1%-0.5% on the plasma jet characteristics was studied. The addition of oxygen resulted in a decrease in plasma plume length due to the electronegativity property of oxygen. Atomic and molecular lines of selected reactive plasma species that are considered to be useful to induce biochemical reactions such as OH transitions A 2 R þ ð ¼ 0; 1Þ ! X 2 PðD ¼ 0Þ at 308 nm and A 2 R þ ð ¼ 0; 1Þ ! X 2 PðD ¼ 1Þ at 287 nm, O I transitions 3p 5 P!3s 5 S 0 at 777.41 nm, and 3p 3 P!3s 3 S 0 at 844.6 nm, N 2 (C-B) second positive system with electronic transition C 3 P u ! B 3 P g in the range of 300-450 nm and N 2 þ (B-X) first negative system with electronic transition B 2 R þ u ! X 2 R þ g ðD ¼ 0Þ at 391.4 nm have been studied. The atomic emission lines of helium were identified, including the He I transitions 3p 3 P 0 !2s 3 S at 388.8 nm, 3p 1 P 0 ! 2s 1 S at 501.6 nm, 3d 3 D!2p 3 P 0 at 587.6 nm, 3d 1 D!2p 1 P 0 at 667.8 nm, 3s 3 S 1 !2p 3 P 0 at 706.5 nm, 3s 1 S 0 !2p 1 P 0 at 728.1 nm, and H a transition 2p-3d at 656.3 nm. Using a spectral fitting method, the OH radicals at 306-312 nm, the rotational and vibrational temperatures equivalent to gas temperatures of the discharge was measured and the effective non-equilibrium nature of the plasma jet was demonstrated. Our results show that, in the entire active plasma region, the gas temperature remains at 310 6 25 K and 340 6 25 K and it increases to 320 6 25 K and 360 6 25 K in the afterglow region of the plasma jet for pure helium and helium/oxygen (0.1%) mixture, respectively. Additionally, the vibrational temperatures range from 2200 6 100 K and 2500 6 100 K for pure helium and helium/oxygen (0.1%) mixture, respectively. The plasma jet was tested on heat sensitive polymer films used in biomedical applications such as polyethylene terephthalate and poly-L-lactide samples continuously for several minutes without causing any physical or thermal damage to the films. The plasma jet produces significant reactive species of interest while the gas temperatures remain very low demonstrating its potential for a range of biomedical applications. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Rotational and Vibrational Temperature Measurementsmentioning

confidence: 99%

Optical emission spectroscopic diagnostics of a non-thermal atmospheric pressure helium-oxygen plasma jet for biomedical applications

Thiyagarajan¹,

Sarani²,

Nicula³

2013

Journal of Applied Physics

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“…The major chemical reactions occurring during the treatments in this study are summarized in Eqs. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) in Table 1 [6,[23][24][25][26][27].…”

Section: Hydroxyl Radical Detection Using Terephthalic Acidmentioning

confidence: 99%

Hydroxyl Radicals and Hydrogen Peroxide Formation at Nonthermal Plasma–Water Interface

Zhao

Wang

Wilson

et al. 2016

IEEE Trans. Plasma Sci.

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This work investigated hydroxyl radicals and hydrogen peroxide formation under a needle-plate electrode configuration using positive-polarity d.c. discharges generated in air, nitrogen and helium. The discharge mode in air and nitrogen was found to change above ultrapure water, initially a nanosecond pulse discharge was observed, transitioning to a diffuse discharge due to the increasing conductivity of the water. The discharge in helium was a nanosecond pulse discharge and the repetition rate increased with increasing water conductivity. It was found that hydroxyl radicals contribute to 7%, 78% and 70% of hydrogen peroxide formation when using ultrapure water in air, nitrogen and helium, respectively. It is suggested that hydroxyl radicals are formed by water reactions with energetic positive ions and neutral particles such as N 2 + , He + , O, H and HO 2. Part of the hydrogen peroxide is formed directly from atoms and radical reactions with water in nitrogen and helium, while oxygen reactions are heavily involved for hydrogen peroxide formation in air. A fluorophotometry method, using terephthalic acid, was used to directly quantify the formation of hydroxyl radicals and compared with the tert-butanol method.

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“…As was shown in (Soloshenko, 2009), the power spent for an electron-impact inelastic process with the threshold energy ε ei can be presented as…”

Section: Electron Energy Distribution Functionmentioning

confidence: 99%

Numerical Simulation of Plasma Kinetics in Low-Pressure Discharge in Mixtures of Helium and Xenon with Iodine Vapours

Shchedrin¹,

Kalyuzhnaya²

2011

Numerical Simulations of Physical and Engineering Processes

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Effect of water adding on kinetics of barrier discharge in air

Cited by 41 publications

References 40 publications

Optical emission spectroscopic diagnostics of a non-thermal atmospheric pressure helium-oxygen plasma jet for biomedical applications

Optical emission spectroscopic diagnostics of a non-thermal atmospheric pressure helium-oxygen plasma jet for biomedical applications

Hydroxyl Radicals and Hydrogen Peroxide Formation at Nonthermal Plasma–Water Interface

Numerical Simulation of Plasma Kinetics in Low-Pressure Discharge in Mixtures of Helium and Xenon with Iodine Vapours

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