scholarly journals Generators of Atmospheric Pressure Diffuse Discharge Plasma and Their Use for Surface Modification

Plasma ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 27-38
Author(s):  
Mikhail Erofeev ◽  
Mikhail Lomaev ◽  
Vasilii Ripenko ◽  
Mikhail Shulepov ◽  
Dmitry Sorokin ◽  
...  
Keyword(s):  
Surface Layer ◽  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Atmospheric Pressure Plasma ◽  
Strength Distribution ◽  
Uniform Electric Field ◽  
Flow Mode ◽  
Diffuse Discharge ◽  
Circulation Mode ◽  
Discharge Gap

Studies of the properties of runaway electron preionized diffuse discharges (REP DDs) and their possible use have been carried out for more than 15 years. Three experimental setups generating a low-temperature atmospheric-pressure plasma and differing in the geometry of a discharge gap were developed. They allow the treatment of surfaces of different materials with an area of several tens of square centimeters. A diffuse discharge plasma was formed in the pulse–periodic mode by applying negative voltage pulses with an amplitude of several tens of kilovolts and a duration of 4 ns to a discharge gap with sharply non-uniform electric field strength distribution. This paper presents experimental results of the study of the surface layer microstructure of copper and steel specimens of different sizes after treatment with the REP DD plasma in nitrogen flow mode and nitrogen circulation mode in the discharge chamber. It was shown that after 105 discharge pulses, the carbon concentration decreases and a disoriented surface layer with a depth of up to 200 nm is formed. Moreover, the results of X-ray phase analysis did not reveal changes in the phase composition of the surface of copper specimens. However, as a result of surface treatment with the REP DD plasma, the copper lattice becomes larger and the microstress increases.

scholarly journals Increasing the Laser-Induced Damage Threshold of Optical Components by Atmospheric Pressure Plasma Surface Finishing

2019 ◽  
Vol 215 ◽  
pp. 01003
Author(s):  
Christoph Gerhard ◽  
Marco Stappenbeck ◽  
Daniel Tasche
Keyword(s):  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Atmospheric Pressure Plasma ◽  
Damage Threshold ◽  
Surface Cleaning ◽  
Surface Finishing ◽  
Dielectric Barrier Discharge Plasma ◽  
Optical Components ◽  
Barrier Discharge Plasma ◽  
Laser Induced Damage

In this contribution, a plasma-based approach for finishing optics surfaces is introduced. Experiments were performed on classically manufactured zinc crown glass and sapphire. It is shown that the use of direct dielectric barrier discharge plasma at atmospheric pressure allows the removal of surface-adherent carbonaceous contaminations that were induced by classical manufacturing. Moreover, the use of such plasma leads to a certain decrease in surface roughness. Both effects, surface cleaning and smoothing finally increase the laser-induced damage threshold of optical components.

Application of Cold Atmospheric Pressure Plasmas for Biological Tissue Treatment

2015 ◽  
Vol 1084 ◽  
pp. 602-605 ◽  
Author(s):  
Aleksandr N. Aleinik ◽  
Aleksandr N. Baykov ◽  
Georgiy Ts. Dambaev ◽  
Evgeniy V. Semichev
Keyword(s):  
Biological Tissue ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Air Plasma ◽  
Plasma Technology ◽  
Large Application ◽  
Wet Chemical ◽  
Discharge Gap ◽  
Air Plasma Treatment

New experiments using atmospheric pressure plasma have found large application in biology and medicine. Cold air plasma treatment can be used to modify the surface of different materials for a variety of applications. The emission spectroscopy data confirmed the presence of different reactive species in the discharge gap. Surface treatments using this dry plasma technology offer an environmentally friendly alternative to the conventional wet chemical methods of microorganisms destruction, biological tissue treatment, in vitro and in vivo cell treatment. The use of cold plasma technology removes contaminants at the nanometer level.

Study on the Generation and Modification of Surface Atmospheric Pressure Air Diffuse Discharge Plasma on Aramid Fabric

2021 ◽  
Author(s):  
Pengxiang Liu ◽  
Wenzheng Liu ◽  
Luxiang Zhao ◽  
Yiwei Sun ◽  
Jinhao Yi ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Discharge Plasma ◽  
Diffuse Discharge ◽  
Aramid Fabric

Influence of the Plasma of Nanosecond Diffuse Discharge in Air at Atmospheric Pressure on the Electrophysical Properties of Epitaxial CdHgTe Films

2016 ◽  
Vol 685 ◽  
pp. 676-679
Author(s):  
K.A. Lozovoy ◽  
D.V. Grigoryev ◽  
V.F. Tarasenko ◽  
M.A. Shulepov
Keyword(s):  
Atmospheric Pressure ◽  
Epitaxial Films ◽  
Uniform Electric Field ◽  
Physical Parameters ◽  
Volume Discharge ◽  
Nanosecond Duration ◽  
Near Surface ◽  
Type Conductivity ◽  
Diffuse Discharge ◽  
P Type

In this paper the influence of the volume discharge of nanosecond duration formed in a non-uniform electric field at atmospheric pressure on samples of CdHgTe (MCT) epitaxial films of p-type conductivity is investigated. Measurements of electro-physical parameters of MCT samples after irradiation have shown that a layer exhibiting n-type conductivity is formed in the near-surface area of epitaxial films. After more than 600 pulses of influence parameters and thickness of the resulting n-layer is such that the measured field dependence of Hall coefficient corresponds to the material of n-type conductivity. The obtained results show that application of volume nanosecond discharge in air at atmospheric pressure is promising for the modification of the surface properties of epitaxial films of MCT.

Investigation on Atmospheric Pressure Plasma Jet of DBD and its Application on Bacteria Inactivation

2015 ◽  
Vol 719-720 ◽  
pp. 221-230
Author(s):  
Tao Liang ◽  
Shi Ying Hou
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Plasma ◽  
Flow Mode ◽  
Half Cycle ◽  
Multiple Pulse ◽  
Jet Length ◽  
Bacteria Inactivation

Two kinds of multiple-pulse were reported on atmospheric plasma jet (APPJ) of dielectric barrier discharge (DBD) configurations in this study. Meanwhile, the investigation on electrical characteristics of APPJ in helium and helium/air was carried out with the aim of shedding light on the electrode parameters for dissipated power and jet length. The typical bacteria, E. coil, were employed to study the effect by the two APPJ devices (PJ-1 and PJ-2). For PJ-1, multiple-pulse appears in both sides of every half-cycle, but only in the positive half-cycle for PJ-2. A wider power electrode of PJ-1 and further distance from the nozzle to grounding electrode of PJ-2, whether in ambient helium or helium/air, are all conducive to improvement of dissipated power. With the increase of gas flow rate, the jet length will become longer at laminar flow mode, then get shorter, and a permanent to the end. Generally, the introduction of air leads a better sterilization effect, especially for PJ-1. Keywords: Atmospheric Pressure, multiple-pulse, Electrode parameters, dissipated power, jet length, plasma jet. PACS: 52.80.-s, 52.77.-j

Influence of Atmospheric Pressure Torch Plasma Irradiation on Plant Growth

2012 ◽  
Vol 1469 ◽  
Author(s):  
Yusuke Akiyoshi ◽  
Nobuya Hayashi ◽  
Satoshi Kitazaki ◽  
Kazunori Koga ◽  
Masaharu Shiratani
Keyword(s):  
Atmospheric Pressure ◽  
Plasma Torch ◽  
Discharge Plasma ◽  
Plant Cells ◽  
Atmospheric Pressure Plasma ◽  
Stem Length ◽  
Growth Enhancement ◽  
Alumina Ceramics ◽  
Plasma Irradiation ◽  
Atmospheric Discharge

ABSTRACTGrowth enhancement characteristics of plants are investigated using an atmospheric discharge plasma. Atmospheric pressure plasma torch is consisted of alumina ceramics tube and the steel mesh electrodes wound inside and outside of the tube. The growth enhancement was observed in the length of stem and root of plants after the plasma irradiation to seeds. The stem length increases approximately 2.8 times after the cultivation time of 24 h. And the effect is found to be maintained for 40 h, after sowing seeds. The mechanism of the growth enhancement would be the redox reaction inside plant cells induced by oxygen radicals.

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