scholarly journals Initiation of the plasma jet of the magneto-plasma compressor by the external plasma source

2021 ◽  
Vol 2100 (1) ◽  
pp. 012005
Author(s):  
V G Brovkin ◽  
A I Klimov ◽  
I Ch Mashek ◽  
A S Pashchina ◽  
N M Ryazansky ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Plasma Source ◽  
Liquid Mixtures ◽  
Plasma Jets ◽  
Front Velocity ◽  
Erosion Plasma ◽  
Gas Plasma ◽  
Preliminary Study ◽  
First Time

Abstract The results of a preliminary study of the interaction of supersonic gas-plasma flows created by a magneto-plasma compressor and a pulsed erosion plasma jet are presented. Stable initiation of the MPC discharge at atmospheric pressure was achieved for the first time. The advantage of using the coaxial arrangement of plasma jets sources for MPC discharge initiation is shown. A noticeable change in the shock wave front velocity and pressure (up to 20%), created during the MPC discharge and dispersed powders and liquid mixtures interaction, is discovered.

scholarly journals Tailoring the Chemistry of Plasma-Activated Water Using a DC-Pulse-Driven Non-Thermal Atmospheric-Pressure Helium Plasma Jet

Plasma ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 127-137 ◽  
Author(s):  
Oh ◽  
Szili ◽  
Hatta ◽  
Ito ◽  
Shirafuji
Keyword(s):  
Hydrogen Peroxide ◽  
Atmospheric Pressure ◽  
Pulse Width ◽  
Plasma Jet ◽  
Plasma Jets ◽  
Helium Plasma ◽  
Uv Absorption Spectroscopy ◽  
Pulse Polarity ◽  
Plasma Activated Water

We investigate the use of a DC-pulse-driven non-thermal atmospheric-pressure He plasma jet in the regulation of hydrogen peroxide (H2O2), nitrite (NO2−), nitrate (NO3−), and oxygen (O2) in deionized (DI) water. The production of these molecules is measured by in situ UV absorption spectroscopy of the plasma-activated water (PAW). Variations in the pulse polarity and pulse width have a significant influence on the resultant PAW chemistry. However, the trends in the concentrations of H2O2, NO2−, NO3−, and O2 are variable, pointing to the possibility that changes in the pulse polarity and pulse width might influence other plasma variables that also impact on the PAW chemistry. Overall, the results presented in this study highlight the possibility of using DC-pulse-driven plasma jets to tailor the chemistry of PAW, which opens new opportunities for the future development of optimal PAW formulations across diverse applications ranging from agriculture to medicine.

scholarly journals Study of Modified Area of Polymer Samples Exposed to a He Atmospheric Pressure Plasma Jet Using Different Treatment Conditions

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1028 ◽  
Author(s):  
Thalita M. C. Nishime ◽  
Robert Wagner ◽  
Konstantin G. Kostov
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Industrial Applications ◽  
Plasma Jets ◽  
Limited Area ◽  
Plastic Tube ◽  
Pressure Plasma ◽  
Treatment Conditions ◽  
Jet Modification

In the last decade atmospheric pressure plasma jets (APPJs) have been routinely employed for surface processing of polymers due to their capability of generating very reactive chemistry at near-ambient temperature conditions. Usually, the plasma jet modification effect spans over a limited area (typically a few cm²), therefore, for industrial applications, where treatment of large and irregular surfaces is needed, jet and/or sample manipulations are required. More specifically, for treating hollow objects, like pipes and containers, the plasma jet must be introduced inside of them. In this case, a normal jet incidence to treated surface is difficult if not impossible to maintain. In this paper, a plasma jet produced at the end of a long flexible plastic tube was used to treat polyethylene terephthalate (PET) samples with different incidence angles and using different process parameters. Decreasing the angle formed between the plasma plume and the substrate leads to increase in the modified area as detected by surface wettability analysis. The same trend was confirmed by the distribution of reactive oxygen species (ROS), expanding on starch-iodine-agar plates, where a greater area was covered when the APPJ was tilted. Additionally, UV-VUV irradiation profiles obtained from the plasma jet spreading on the surface confirms such behavior.

scholarly journals Investigation of a cold atmospheric plasma jet generation in single and multichannel planar devices

2021 ◽  
Vol 2064 (1) ◽  
pp. 012127
Author(s):  
P P Gugin ◽  
D E Zakrevsky ◽  
E V Milakhina
Keyword(s):  
Applied Voltage ◽  
Atmospheric Pressure ◽  
Plasma Jet ◽  
Plasma Source ◽  
Atmospheric Plasma ◽  
Planar Geometry ◽  
Collector Current ◽  
Cold Atmospheric Plasma

Abstract A plasma source of atmospheric pressure with a planar geometry of the device and an adjustable number of planar discharge channels has been developed. The dependence of the recorded collector current on the amplitude of the applied voltage is investigated. It was found that the current in each of the channels consists of a set of independent current channels whose propagation does not depend on each other.

Patterns of plasma jet arrays in the gas flow field of non-thermal atmospheric pressure plasma jets

2019 ◽  
Vol 26 (1) ◽  
pp. 013505 ◽  
Author(s):  
M. Hasnain Qaisrani ◽  
Congyun Li ◽  
Pei Xuekai ◽  
M. Khalid ◽  
Xian Yubin ◽  
...  
Keyword(s):  
Flow Field ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Plasma Jets ◽  
Pressure Plasma ◽  
Gas Flow Field

scholarly journals Effects of a Nonthermal Atmospheric Pressure Plasma Jet on Human Gingival Fibroblasts for Biomedical Application

2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
Jung-Hwan Lee ◽  
Kyoung-Nam Kim
Keyword(s):  
Cell Death ◽  
Atmospheric Pressure ◽  
Biomedical Application ◽  
Safety Issue ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Plasma Jets ◽  
Human Gingival Fibroblasts ◽  
Gingival Fibroblasts ◽  
Pressure Plasma

Nonthermal atmospheric pressure plasma jets (APPJ) have been developed and applied in biomedical research as a cancer treatment or bacterial sterilization. However, the drawback of APPJ on normal oral cells during plasma treatment and underlying cell death mechanisms have not been studied and clearly explained, although there is known to be an influence from reactive oxygen species (ROS). Hence, this study investigates whether and how a nonthermal atmospheric pressure air plasma jet kills human normal gingival cells using immortalized human gingival fibroblasts (hTERT-hNOF cells). In this study, a set of physicochemical or biological methods were used to illuminate the killing mechanisms. It was found that ROS were induced intracellularly without a breakdown of the cell wall and apoptosis was involved in cell death when an air APPJ treatment was performed on the cells directly without media; the air treatment only supported a detachment of the cells without increase of ROS. It was also revealed that a correlation between intracellular ROS concentration and cells viability existed. These results indicated that the direct air APPJ treatment possibly raises safety issue to normal tissue and thereby APPJ application in biomedical field needs morein vitroandin vivostudy to optimize it.

scholarly journals Effects of O2 Addition on the Discharge Parameters and Production of Reactive Species of a Transferred Atmospheric Pressure Plasma Jet

2021 ◽  
Vol 11 (14) ◽  
pp. 6311
Author(s):  
Fellype Nascimento ◽  
Kleber Petroski ◽  
Konstantin Kostov
Keyword(s):  
Atmospheric Pressure ◽  
Light Emission ◽  
Noble Gas ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Reactive Species ◽  
Plasma Jets ◽  
Therapeutic Effects ◽  
Plastic Tube ◽  
Pressure Plasma

The therapeutic effects of atmospheric pressure plasma jets (APPJs) have been associated with the presence of reactive species, mainly the reactive oxygen and nitrogen ones, generated in this kind of plasmas. Due to that, many studies attempting to enhance the production of reactive species in APPJs have been performed. The employment of gas admixtures, usually mixing a noble gas with oxygen (O2) or water vapor, is one of the most common methods to achieve such goal. This work presents a study of how the addition of small amounts of O2 affects the electrical parameters and the production of reactive species in a transferred APPJ produced at the tip of a long and flexible plastic tube. The study was carried out employing helium (He) as the working gas and applying a high voltage (HV) in the form of amplitude-modulated sine waveform (burst mode). With this configuration it was possible to verify that the O2 addition reduces the discharge power and effective current, as a result of late ignition and shorter discharge duration. It was also found that the addition of O2 to a certain content in the gas admixture makes the light emission from oxygen atoms increase, indicating an increment in oxygen related reactive species in the plasma jet. However, at the same time the light emitted from hydroxyl (OH) and nitric oxide (NO) exhibits the opposite behavior, i.e., decrease, indicating a reduction of such species in the APPJ. For these reasons, the addition of O2 to the working gas seems to be useful for increasing the effectiveness of the plasma treatment only when the target modification effect is directly dependent on the content of atomic oxygen.

scholarly journals Highly efficient synthesis of [60]fullerene oxides by plasma jet

2017 ◽  
Vol 4 (9) ◽  
pp. 170658 ◽  
Author(s):  
Sheng-Peng Jiang ◽  
Shengxia Duan ◽  
Kai-Qing Liu ◽  
Xiao-Yu Yang ◽  
Cheng Cheng ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Theoretical Calculations ◽  
Chemical Shifts ◽  
Plasma Jet ◽  
Nonequilibrium Plasma ◽  
Efficient Synthesis ◽  
Structural Assignment ◽  
High Yields ◽  
First Time ◽  
C Nmr

Atmospheric pressure nonequilibrium plasma jet has been applied to the synthesis of [60]fullerene oxides (C 60 O n ) for the first time. C 60 O and C 60 O 2 were produced and isolated in high yields up to 44% and 21%, respectively. The structural assignment of C 60 O was confirmed by comparison with the reported spectroscopic data. Theoretical calculations of 13 C NMR chemical shifts for eight isomers of C 60 O 2 were performed and compared with the experimental data to assign the most possible structure for the obtained C 60 O 2 dominantly as an e isomer.

Fundamental properties of a non-destructive atmospheric-pressure plasma jet in argon or helium and its first application as an ambient desorption/ionization source for high-resolution mass spectrometry

2014 ◽  
Vol 29 (3) ◽  
pp. 464-470 ◽  
Author(s):  
Takahiro Iwai ◽  
Anastasia Albert ◽  
Kensuke Okumura ◽  
Hidekazu Miyahara ◽  
Akitoshi Okino ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
High Resolution Mass Spectrometry ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Ionization Source ◽  
Fundamental Properties ◽  
Desorption Ionization ◽  
Gas Plasma ◽  
Non Destructive ◽  
Resolution Mass

An atmospheric damage-free multi-gas plasma jet was investigated and used as an ionization source.

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