Generation of dc pin-hole discharges in liquids: comparison of discharge breakdown in diaphragm and capillary configuration

Kozáková, Zdenka; Krčma, František; Vašíček, Michal; Hlavatá, Lucie; Hlochová, Lenka

doi:10.1140/epjd/e2015-50331-6

Cited by 7 publications

(9 citation statements)

References 24 publications

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“…The system is supplied by a specially designed power supply using one way rectification with an internal capacitance of 1.6 μF without any additional stabilizing resistance or inductance. The full scheme of this power supply was recently published in [27]. This allows obtaining high current pulses of a value up to 100 A limited by the solution conductivity.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, the discharge is ignited inside the micro bubbles in the pinhole. This principle is known as the thermal or bubble theory of discharge breakdown in liquids [26][27][28]. According to the ratio of the barrier thickness to the orifice diameter, we can distinguish a diaphragm discharge (the thickness/diameter ratio is approximately one) and a capillary discharge (the thickness is substantially higher than the orifice diameter).…”

Section: Introductionmentioning

confidence: 99%

“…The presented study gives a detailed characterization of a recently developed electrode system based on the pin-hole discharge configuration that was recently patented in the Czech Republic [31]. Its construction is based on our long term experience with pin-hole discharges generated in various liquids and solutions [12,27,[32][33][34][35][36] and the operating conditions are described in our previous work [37]. The current paper focuses on the discharge breakdown phenomena and operational regimes.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of novel pin-hole based plasma source for generation of discharge in liquids supplied by DC non-pulsing voltage

Krčma

Kozáková

Mazánková

et al. 2018

Plasma Sources Sci. Technol.

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A recently presented novel plasma source generating discharge in liquids based on the pin-hole discharge configuration is characterized in detail. The system is supplied by DC non-pulsing high voltage of both polarities in NaCl water solutions at a conductivity range of 100-15 000 μS/cm. The discharge itself shows self-pulsing operation. The discharge ignition is observed in micro bubbles by transient discharge followed by a glow discharge in positive polarity at lower conductivities propagating inside the bubbles. At high conductivities, the glow regime is particularly replaced by a more energetic sequence of transient discharges followed by a shorter glow mode operation. The transient regime probability and its intensity are higher in the negative discharge polarity. The transient discharge produces acoustic waves and shock waves, which are observed at the moment of the bubble cavitation. The average gas temperature of 700-1500 K was calculated from the lowest OH (A-X) 0-0 band transitions. The average electron concentrations of 10 20 -10 23 m −3 were calculated from H α and H β line profiles. Finally, the production of a chemically active species is determined by hydrogen peroxide energy yields related to the energy consumption of the whole interelectrode system. All these quantities are dependent on the solution conductivity, the discharge polarity, and the applied power.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of novel pin-hole based plasma source for generation of discharge in liquids supplied by DC non-pulsing voltage

Krčma

Kozáková

Mazánková

et al. 2018

Plasma Sources Sci. Technol.

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“…The mean total discharge power remained constant at 160 W during the treatment. The discharge was primary created in a bubble of evaporated water in and/or near the pin‐hole made in the diaphragm (Figure b) . When the dc high voltage was used, longer plasma channels of the “positive discharge” were formed in the cathode part of the reactor while shorter bush‐like streamers in a spherical shape formed the “negative discharge” in the anode part (Figure a) …”

Section: Methodsmentioning

confidence: 99%

Comparison of liquid and liquid‐gas phase plasma reactors for discoloration of azo dyes: Analysis of degradation products

Kozáková

Klimova

Obradović

et al. 2018

Plasma Processes & Polymers

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Three plasma systems are used for decomposition of two organic textile dyes. The highest discoloration efficiency over 90% is reached in the water falling film DBD when maximal energy of 270 and 450 kJ L−1 is applied into Reactive Yellow 125 and Direct Red 79 dye solutions, respectively. Decomposition of the dye molecules is confirmed by concentration decreases in dye chromatograms. Similar degradation products are identified in the positive diaphragm discharge and water falling film DBD. In the negative diaphragm discharge, different products are formed due to electrochemical reactions on the anode. Substitution of halogens, hydrogen addition on the azo group and the cleavage of the azo group itself are the main mechanisms contributing to the destruction of the dye molecule in the compared plasma systems.

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“…This results in high concentrations of short-lived active particles together with electromagnetic field and UV radiation at plasma-liquid interface (Krcma et al 2018). The underwater diaphragm discharge is the same type plasma source as the one used in Kozakova et al 2015, Vyhnankova et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Termal olmayan plazma tedavisi ile mikro çoğaltılmış erik bitkilerinde Plum pox virus inaktivasyonu çalışmaları

Milusheva

Nacheva

Benova³

et al. 2020

Bitki Koruma Bülteni

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Recently, cold atmospheric plasma (CAP) is under investigation for possibility to be applied for inactivation of pathogens in medicine, food technologies, water cleaning technologies and agriculture. The aim of the current study is to investigate the effect of CAP on microplants, propagated in vitro from plum tree (Prunus domestica L., cv. 'Kyustendilska sinya') naturally co-infected by M and D strains of Plum pox virus (PPV) and in that respect the possibility for CAP application for virus inactivation. In the present work, we have used two types of plasma sources for biological systems treatments: a surface-wave-sustained Argon plasma torch and an underwater diaphragm discharge. These enabled several variants of plasma treatment to be performed. Based on the data of IC-RT-PCR tests of the microplants on the third subculture after treatment, it was found the most effective variant was the reiterated plasma torch tip treatment to nodal segments without leaves in gas medium. The strain specific RT-PCR analysis results of PPV positive CAP-treated microplants showed that only PPV-M strain was identified after treatment, although the starting material was co-infected by both strains. The results obtained from IC-RT-PCR and strain specific RT-PCR of the acclimatized ex vitro plants have been in agreement with the data from molecular analyses of the microplants tested. These are the first experiments on CAP ability for inactivation of PPV from tissue of living woody plants even if in in vitro conditions. The completed estimation of this approach for obtaining of PPV-free plum plants will be made after more prolonged observation and testing of the ex vitro plants.

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Generation of dc pin-hole discharges in liquids: comparison of discharge breakdown in diaphragm and capillary configuration

Cited by 7 publications

References 24 publications

Characterization of novel pin-hole based plasma source for generation of discharge in liquids supplied by DC non-pulsing voltage

Characterization of novel pin-hole based plasma source for generation of discharge in liquids supplied by DC non-pulsing voltage

Comparison of liquid and liquid‐gas phase plasma reactors for discoloration of azo dyes: Analysis of degradation products

Termal olmayan plazma tedavisi ile mikro çoğaltılmış erik bitkilerinde Plum pox virus inaktivasyonu çalışmaları

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