Theoretical Study of Plasma Parameters Dependence on Gas Temperature in an Atmospheric Pressure Argon Microwave Discharge

2008 ◽  
Author(s):  
M. Pencheva ◽  
E. Benova ◽  
I. Zhelyazkov ◽  
Hans-Jürgen Hartfuss ◽  
Michel Dudeck ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Theoretical Study ◽  
Microwave Discharge ◽  
Gas Temperature ◽  
Plasma Parameters

scholarly journals Helium Atmospheric Pressure Plasma Jet Source Treatment of White Grapes Juice for Winemaking

2021 ◽  
Vol 11 (18) ◽  
pp. 8498
Author(s):  
Ramona Huzum ◽  
Andrei Vasile Nastuta
Keyword(s):  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Gas Temperature ◽  
Plasma Parameters ◽  
Pressure Plasma ◽  
Long Term Storage ◽  
Term Storage

In the last few years, new emerging technologies to develop novel winemaking methods were reported. Most of them pointed out the need to assess the barrel aging on the wine product, fermentation process, green technologies for wine treatment for long term storage. Among these, plasma technologies at atmospheric pressure are on the way of replacing old and expensive methods for must, wine and yeast treatment, the goal being the long-term storage, aging and even decontamination of such products, and seems to meet the requirements of the winemakers. Using the principles of dielectric barrier discharge, we power up an atmospheric pressure plasma jet in helium. This plasma is used for treatment of fresh must obtained from white grapes. Our research manuscript is focused on the correlation of plasma parameters (applied voltage, plasma power, reactive species, gas temperature) with the physico-chemical properties of white must and wine (1 and 2 years old), via ultraviolet–visible and infrared spectroscopy, and colorimetry. Two types of white must were plasma treated and studied over time. The 10 W plasma source did not exceed 40 °C during treatment, the must did not suffer during thermal treatment. A higher quantity of RONS was observed during plasma-must exposure, supporting further oxidation processes. The UV-Vis and FTIR spectroscopy revealed the presence of phenols, flavones and sugar in the wine samples. Simultaneous visualization of CIE L*a*b* and RGB in color space charts allows easier understanding of wine changing in color parameters. These experimental results supporting the possible usability of atmospheric pressure plasma for winemaking.

Experimental and theoretical study of the effect of gas flow on gas temperature in an atmospheric pressure microplasma

2007 ◽  
Vol 40 (14) ◽  
pp. 4202-4211 ◽  
Author(s):  
Qiang Wang ◽  
Florian Doll ◽  
Vincent M Donnelly ◽  
Demetre J Economou ◽  
Nader Sadeghi ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Theoretical Study ◽  
Gas Temperature

scholarly journals Features of processes in a microwave discharge in water vapor

2021 ◽  
pp. 5-10
Author(s):  
Yurii Lebedev ◽  
Alekcey Tatarinov ◽  
Irina Epstein ◽  
Alexander Titov
Keyword(s):  
Water Vapor ◽  
Atmospheric Pressure ◽  
Microwave Field ◽  
Microwave Discharge ◽  
Specific Power ◽  
Gas Temperature ◽  
Reduced Pressure ◽  
Joint Solution ◽  
Steady State Simulation ◽  
Reduced Pressures

A zero-dimensional steady-state simulation of microwave discharge in water vapor at atmos-pheric and reduced pressures and a constant gas temperature has been carried out. A model of a continuous stirring reactor is used. A joint solution of the balance equations for neutral and charged plasma components, the Boltzmann equation for plasma electrons, and the equation for the stationary distribution of the microwave field in a volume filled with plasma is carried out. The dependences of various parameters of thedischarge (the magnitude of the microwave field, the concentrations of all components) on the input specific power WVare obtained. It is shown that at reduced pressure the magnitude of the microwave field in the plasma is signifi-cantly lower, and the electron concentration is higher than at atmospheric pressure at the same applied specific power. At atmospheric pressure the water plasma is electronegative, and quasi-neutrality is maintained by the negative OH-ion in the range of the considered WV values. Transition from electronegative to electropositive plasma occurs at pressure of 30 Torr and ap-plied specific power of 60–70 kW/cm3

scholarly journals Cold Atmospheric Pressure Plasma Technology for Biomedical Application

2021 ◽  
Author(s):  
Rakesh Ruchel Khanikar ◽  
Heremba Bailung
Keyword(s):  
Atmospheric Pressure ◽  
Biomedical Applications ◽  
Biomedical Application ◽  
Biological Effects ◽  
Relative Concentration ◽  
Density Measurement ◽  
Reactive Species ◽  
Gas Temperature ◽  
Plasma Technology ◽  
Plasma Parameters

Cold plasma generated in an open environment with a temperature nearly around room temperature has recently been a topic of great importance. It has unlocked the door of plasma application in a new direction: biomedical applications. Cold atmospheric pressure (CAP) plasma comprises various neutral and charged reactive species, UV radiations, electric current/fields etc., which have several impactful effects on biological matter. Some of the significant biological effects of CAP plasma are inactivation of microorganism, stimulation of cell proliferation and tissue regeneration, destruction of cells by initializing apoptosis etc. Although the detailed mechanism of action of plasma on biomaterials is still not completely understood, some basic principles are known. Studies have indicated that the reactive oxygen species and nitrogen species (ROS, RNS) play a crucial role in the observed biological effects. In this perspective, this chapter first provides a brief discussion on the fundamentals of CAP plasma and its generation methods. Then a discussion on the optical diagnostics methods to characterize the plasma is provided. Optical emission spectroscopy (OES) is used to identify the reactive species and to measure their relative concentration. Other important plasma parameters such as gas temperature, electron/excitation temperature and electron density measurement methods using OES have also been discussed. Then a discussion on the application of CAP plasma in biomedical field is provided. A thorough understanding of biochemical reaction mechanisms involving highly reactive plasma species will further improve and extend CAP plasma technology in biomedical applications.

scholarly journals Enhanced Wetting and Adhesive Properties by Atmospheric Pressure Plasma Surface Treatment Methods and Investigation Processes on the Influencing Parameters on HIPS Polymer

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 901
Author(s):  
Miklós Berczeli ◽  
Zoltán Weltsch
Keyword(s):  
Surface Treatment ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
High Impact ◽  
Plasma Parameters ◽  
Plasma Surface ◽  
Wetting Properties ◽  
High Impact Polystyrene ◽  
Process Modification ◽  
Plasma Surface Treatment

The development of bonding technology and coating technologies require the use of modern materials and topologies for the demanding effect and modification of their wetting properties. For the industry, a process modification process that can be integrated into a process is the atmospheric pressure of air operation plasma surface treatment. This can be classified and evaluated based on the wettability, which has a significant impact on the adhesive force. The aim is to improve the wetting properties and to find the relationship between plasma treatment parameters, wetting, and adhesion. High Impact PolyStyrene (HIPS) was used as an experimental material, and then the plasma treatment can be treated with various adjustable parameters. The effect of plasma parameters on surface roughness, wetting contact angle, and using Fowkes theory of the surface energy have been investigated. Seven different plasma jet treatment distances were tested, combined with 5 scan speeds. Samples with the best plasma parameters were prepared from 25 mm × 25 mm overlapping adhesive joints using acrylic/cyanoacrylate. The possibility of creating a completely hydrophilic surface was achieved, where the untreated wetting edge angle decreased from 88.2° to 0° for distilled water and from 62.7° to 0° in the case of ethylene glycol. The bonding strength of High Impact PolyStyrene was increased by plasma treatment by 297%.

Electron Density and Gas Temperature from Line Broadening in an Argon Surface-Wave-Sustained Discharge at Atmospheric Pressure

2004 ◽  
Vol 58 (9) ◽  
pp. 1032-1037 ◽  
Author(s):  
M. Christova ◽  
E. Castaños-Martinez ◽  
M. D. Calzada ◽  
Y. Kabouzi ◽  
J. M. Luque ◽  
...  
Keyword(s):  
Surface Wave ◽  
Electron Density ◽  
Atmospheric Pressure ◽  
Gas Temperature ◽  
Line Broadening ◽  
Sustained Discharge

scholarly journals Optical Emission Spectroscopic Analysis of Plasma Parameters in Cadmium by Nd: YAG laser Technique

2021 ◽  
Vol 2114 (1) ◽  
pp. 012049
Author(s):  
Uday H. Tawfeeq ◽  
Ahmed K. Abbas ◽  
Kadhim A. Aadim
Keyword(s):  
Laser Pulse ◽  
Atmospheric Pressure ◽  
Spectroscopic Analysis ◽  
Debye Length ◽  
Optical Emission ◽  
Plasma Electron ◽  
Laser Technique ◽  
Plasma Parameters ◽  
Yag Laser ◽  
Emission Spectroscopic Analysis

Abstract In this work, optical emission spectroscopy (OES) was used to estimate the parameters of plasma electron temperature (Te), electron density (ne), plasma frequency (fp), Debye length (λD), and Debye number (ND). Understanding how an energy pulsed laser affects these variables is also important. Irradiation of pure cadmium using an Nd: YAG laser pulse with a wavelength(1064)nm and energy ranging from (200-600)millijoules, of frequency (6) Hz. The spectrum of laser-induced plasma was detected under atmospheric pressure. It was discovered that when the energy of the laser pulse rises, the intensity of the CdI and CdII lines increases.

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