Microwave Plasma Torch at a Water Surface

Benova, E; Atanasova, Mariana; Bogdanov, Todor; Marinova, Plamena; Krčma, František; Mazánková, Věra; Dostál, Lukáš

doi:10.1615/plasmamed.2016015862

Cited by 15 publications

(10 citation statements)

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“…The recently developed microwave surface-wave operating plasma torch properties represent a unique combination of advantages of planar DBD systems and high frequency jets [34,35]. The well-known surface-wave discharge (SWD) [36] usually operates at low and intermediate pressures and high wave power (>100 W) in noble gases because filamentation occurs at atmospheric pressure [37].…”

Section: Introductionmentioning

confidence: 99%

Microwave micro torch generated in argon based mixtures for biomedical applications

Krčma¹,

Tsonev²,

Šmejkalová³

et al. 2018

J. Phys. D: Appl. Phys.

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The subject of this paper is the recently developed 2.45 GHz microwave micro torch, which produces a surface wave discharge operating at low power of 25 W. Microwave plasma is generated using surfatron resonator in pure argon and argon with admixtures (up to 1.7%) of nitrogen and oxygen at the gas flow rate of 3 Slm. Two different configurations are used-a standard one and one with an additional metallic plate at the surfatron resonator end limiting the surface wave propagation along the plasma. Plasma parameters like temperatures (rotational, vibrational, electron) along the plasma torch axis as well as distribution of selected active particles are determined. The numeric simulation of the discharge and its properties are included, too. Finally, surface temperature of the fresh pork skin affected by the active particles flow is determined using thermo camera images. The obtained results show applicability of this system for the surface treatment of biological objects and possibility to modify the torch conditions by molecular gases additions.

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Section: Introductionmentioning

confidence: 99%

Microwave micro torch generated in argon based mixtures for biomedical applications

Krčma¹,

Tsonev²,

Šmejkalová³

et al. 2018

J. Phys. D: Appl. Phys.

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“…13 That is why for the plasma treatment we have used the last 2-3 mm of the plasma torch to be in contact with the sample or the liquid surface like in the previous work. 14…”

Section: Plasma Sourcementioning

confidence: 99%

Effect of Plasma-Activated Medium and Water on Replication and Extracellular Virions of Herpes Simplex Virus-1

et al. 2020

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We use a surface-wave sustained discharge (SWD) in argon at atmospheric pressure (using a plasma torch) in these experiments. The plasma torch is sustained using a 2.45-GHz electromagnetic wave with applied microwave powers of 13, 15, and 20 W. At these discharge conditions, the length of the plasma torch outside of the quartz tube is ~1-1.5 cm, and the gas plasma temperature does not exceed 40°C. This allows direct treatment of samples using the active zone of the discharge. In the cytotoxicity study, only two of the experimental settings achieve up to 50% survival of the cell monolayer after adding plasma-treated medium. Examining the effect of the plasma torch treatment media on herpes simplex virus-1 replication, we found that none of the applied experimental assays show significant protection on the cell monolayer. In a study of the virucidal action of a plasma-treated viral suspension diluted with sterile water at a ratio of 1:2 that was treated for 300 s at 13-W wave power, a decrease in the viral sample titer occurred unlike in the 1.67 log 10 control. Using optical emission spectroscopy, we found that OH intensity increases at the contact point between plasma and the water surface. Intensity of NO-γ also increases to the contact point with applied power. We also monitored the amount of peroxide radicals in plasma-treated water and nutrient medium in the presence of lucigenin.

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“…Our recently developed surface wave-initiated microwave torch [30][31][32][33][34][35] can also be a source of low-temperature plasma. In this case, the plasma is produced by an electromagnetic wave that travels along the interface between the plasma and the dielectric [36].…”

Section: Introductionmentioning

confidence: 99%

“…In the microwave discharge, the plasma has a higher electron temperature than plasma obtained by the indirect and high-frequency discharge. Due to the high temperature of the electrons, there is also a higher dissociation and ionization degree, which is reflected in a wide range of uses of this type of discharge including wound healing [30][31][32][33], surface decontamination of fruits [34] or deposition of thin layers [35]. This paper focuses on the first use of this discharge in the yeast Candia glabrata as a model microorganism.…”

Section: Introductionmentioning

confidence: 99%

Impact of Microwave Plasma Torch on the Yeast Candida glabrata

et al. 2020

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Recently, various cold plasma sources have been tested for their bactericidal and fungicidal effects with respect to their application in medicine and agriculture. The purpose of this work is to study the effects of a 2.45 GHz microwave generated plasma torch on a model yeast example Candida glabrata. The microwave plasma was generated by a surfatron resonator, and pure argon at a constant flow rate of 5 Slm was used as a working gas. Thanks to a high number of active particles generated in low-temperature plasma, this type of plasma has become highly popular, especially thanks to its bactericidal effects. However, its antimycotic effects and mechanisms of fungal inactivation are still not fully understood. Therefore, this study focuses on the antifungal effects of the microwave discharge on Candida glabrata. The main focus is on the measurement and evaluation of changes in inactivation effects caused by varying initial concentration of Candida glabrata cells, applied microwave power and exposure time. The discharge was applied on freshly inoculated colonies of Candida glabrata spread on the agar plates and its inhibitory effects were observed in the form of inhibition zones formed after the subsequent cultivation.

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Microwave Plasma Torch at a Water Surface

Cited by 15 publications

References 0 publications

Microwave micro torch generated in argon based mixtures for biomedical applications

Microwave micro torch generated in argon based mixtures for biomedical applications

Effect of Plasma-Activated Medium and Water on Replication and Extracellular Virions of Herpes Simplex Virus-1

Impact of Microwave Plasma Torch on the Yeast Candida glabrata

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