scholarly journals Physicochemical Properties of Pure Water Treated by Pure Argon Plasma Jet Generated by Microwave Discharge in Opened Atmosphere

2021 ◽  
Vol 8 ◽  
Author(s):  
Konstantin F. Sergeichev ◽  
Natalya A. Lukina ◽  
Ruslan M. Sarimov ◽  
Igor G. Smirnov ◽  
Alexander V. Simakin ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Microwave Discharge ◽  
Pure Water ◽  
Argon Plasma ◽  
Surfactant Solution ◽  
Plasma Jet ◽  
Biological Properties ◽  
Oh Radicals ◽  
Nitrate And Nitrite ◽  
Plasma Activated Water

The physicochemical properties of water activated by high-purity low-temperature argon plasma of electrodeless microwave discharge at atmospheric pressure are investigated. Such parameters of activated water as electrical conductivity, redox potential, hydrogen index (pH), the concentrations of dissolved molecular oxygen, hydrogen peroxide, OH-radicals, nitrate and nitrite anions depending on the plasma jet distance above the water surface and duration of activation were studied. Under irradiation conditions close to optimum, it was shown that the generation rate in the absence of impurities are 200 μM/min for H2O2; 800 μM/min for •OH and 2 mM/min for NOx−. The use of plasma activated water (PAW) in agriculture has been tested. It was shown that strawberry seeds treated with a surfactant solution grow much faster than control seeds. The mechanisms of the chemical composition formation of activated water and its biological properties are discussed.

scholarly journals Influence of Nonthermal Atmospheric Plasma-Activated Water on the Structural, Optical, and Biological Properties of Aspergillus brasiliensis Spores

2020 ◽  
Vol 10 (18) ◽  
pp. 6378
Author(s):  
Se Hoon Ki ◽  
Hyeongjin Noh ◽  
Geum Ran Ahn ◽  
Seong Hwan Kim ◽  
Nagendra K. Kaushik ◽  
...  
Keyword(s):  
Cell Wall ◽  
Fungal Spores ◽  
Plasma Jet ◽  
Biological Properties ◽  
Atmospheric Plasma ◽  
Air Plasma ◽  
Activation Time ◽  
Aspergillus Brasiliensis ◽  
Plasma Activation ◽  
Plasma Activated Water

Plasma-activated water (PAW) has emerged as a platform for sterilizing fungal pathogens. In this study, we investigated the influence of PAW on black melanized spores of Aspergillus brasiliensis to explore the mechanism of fungal spore inactivation. PAW was prepared by activating deionized water with a nonthermal atmospheric pressure air plasma jet (soft plasma jet). The concentrations of H2O2 and NOx in the PAW treated by the soft plasma jet for 3 min were 50 μM and 1.8 mM, respectively, and the pH of the PAW was 3.10. The reactive oxygen and nitrogen species (RONS) in the PAW increased with longer plasma activation time. After being treated for 30 min in the PAW with a plasma activation time of 3 min, the spore viability dramatically dropped to 15%. The viabilities of 0.3% H2O2- and 0.3% HNO3-treated spores were 22% and 42%, respectively. The breakage of the spore cell wall by the PAW was revealed in scanning electron microscope images and flow cytometry measurements. Disruption of cell wall integrity provides a path for intracellular components to escape and RONS of the PAW can attack intracellular components directly. Degradation of high molecular genomic DNA was also observed by agarose gel electrophoresis. These results suggest that long-lived reactive species generated in the PAW play an important role in the inactivation of melanized fungal spores. Consequently, PAW produced by a soft plasma jet can be applied to sterilize bioprotective walled fungal spores in a relatively large volume.

scholarly journals Tuning the composition of plasma-activated water by a surface-wave microwave discharge and a kHz plasma jet

2019 ◽  
Vol 28 (9) ◽  
pp. 095010 ◽  
Author(s):  
Kinga Kutasi ◽  
Dean Popović ◽  
Nikša Krstulović ◽  
Slobodan Milošević
Keyword(s):  
Surface Wave ◽  
Microwave Discharge ◽  
Plasma Jet ◽  
Plasma Activated Water

Particle densities and non-equilibrium in a low-pressure argon plasma jet

1994 ◽  
Vol 14 (3) ◽  
pp. 251-275 ◽  
Author(s):  
Steven P. Fusselman ◽  
Hirotsugu K. Yasuda
Keyword(s):  
Argon Plasma ◽  
Plasma Jet ◽  
Low Pressure ◽  
Argon Plasma Jet ◽  
Non Equilibrium

Influence of Additive Gas on Electrical and Optical Characteristics of Non-equilibrium Atmospheric Pressure Argon Plasma Jet

2011 ◽  
Vol 13 (5) ◽  
pp. 575-582 ◽  
Author(s):  
Xiaomeng Fei ◽  
Shin-ichi Kuroda ◽  
Yuki Kondo ◽  
Tamio Mori ◽  
Katsuhiko Hosoi
Keyword(s):  
Atmospheric Pressure ◽  
Argon Plasma ◽  
Plasma Jet ◽  
Optical Characteristics ◽  
Argon Plasma Jet ◽  
Non Equilibrium

scholarly journals Bacterial inactivation by using non thermal argon plasma jet and its application study for non thermal raw milk processing

2021 ◽  
Vol 794 (1) ◽  
pp. 012104
Author(s):  
Tota Pirdo Kasih ◽  
Dave Mangindaan ◽  
Afifah Septia Ningrum ◽  
C Sebastian ◽  
D Widyaningrum
Keyword(s):  
Argon Plasma ◽  
Plasma Jet ◽  
Raw Milk ◽  
Bacterial Inactivation ◽  
Application Study ◽  
Milk Processing ◽  
Argon Plasma Jet

Mathematical Modeling of a Free Plasma Jet Discharging into Air and Comparison with Probe Measurements

1997 ◽  
Author(s):  
R. Bolot ◽  
M. Imbert ◽  
C. Coddet
Keyword(s):  
Local Thermodynamic Equilibrium ◽  
Argon Plasma ◽  
Plasma Jet ◽  
Equilibrium Composition ◽  
Physical Phenomena ◽  
Plasma Spraying Process ◽  
Spraying Process ◽  
Free Plasma ◽  
Argon Plasma Jet ◽  
Probe Measurements

Abstract Plasma spraying process modeling is useful to understand physical phenomena and to decrease the number of experiments. In this paper, a study of the external plasma jet is proposed: the PHOENICS™ CFD code was used with a 2D axisymmetrical geometry and a standard K-ε turbulence model. In a first step, thermodynamic and transport properties were calculated from chemical equilibrium composition, thermodynamic derivatives and kinetic theory of gases. Local Thermodynamic Equilibrium (LTE) was assumed for both plasma and surrounding gases. The proposed numerical results were computed for comparison with temperature measurements realized by Brossa and Pfender in the case of an argon plasma jet discharging into air, using enthalpy probes. The predictions were found reasonably accurate. The influence of the surrounding gas nature was also verified as the validity of the parabolic assumption.

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