Study of the physical discharge properties of a Ar/O2 DC plasma jet

Barkhordari, Ali; Ganjovi, Alireza; Mirzaei, I.; Falahat, Amir

doi:10.1007/s12648-018-1197-1

Cited by 6 publications

(4 citation statements)

References 34 publications

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“…It can be observed that the number density of positive ions increases at the higher argon percentages in O 2 /Ar gas mixture. This is owing to the higher cross section of momentum transfer for the atomic argon 56 , 57 , since collision energy of electrons decreases at the higher argon percentages. So, the recombination process between the electrons and positive ions will slightly occur in the plasma.…”

Section: Resultsmentioning

confidence: 99%

Influence of the argon admixture on the reactive oxide species formation inside an atmospheric pressure oxygen plasma jet

Barkhordari,

Karimian,

Shahsavari

et al. 2024

Sci Rep

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In this work, a new atmospheric pressure plasma generated in a wire-to-multiwire dielectric barrier discharge on pure oxygen is introduced. This special geometry of 13 wires (one central wire and 12 ones on the external tube) is feeding by a radio frequency (RF) power (13.56 MHz, 1 kW) and produces a stable discharge. The capacity of this device to produce oxygen reactive species and the influence of Ar gas mixture (1–3%) on this production are investigated. The main characteristics of this DBD plasma are measured using optical emission spectroscopy techniques. The rotational, vibrational, and excitation temperatures along with the electron density are determined from OH (A2Σ → X2Π) band and the Stark broadening of the hydrogen atomic line at 486.1 nm, respectively. The temporal evolution and spatial distribution of charged and reactive species in this plasma are also numerically studied by a Global scheme and a two-dimension fluid model based on drift–diffusion approximation. A kinetic dominated by electron collisions is obtained for this plasma. The generation and movement of electrons, positive and negative ions in the wire-to-multiwire configuration are analyzed and discussed according to changes the electric field and plasma frequency. It is shown that the density of both charged and reactive species increases by adding a small amount of argon to the oxygen plasma while the electron temperature reduces in this configuration. A high level of agreement is observed between the experimental and simulation results for the electron density and temperature in this DBD plasma.

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Section: Resultsmentioning

confidence: 99%

Influence of the argon admixture on the reactive oxide species formation inside an atmospheric pressure oxygen plasma jet

Barkhordari,

Karimian,

Shahsavari

et al. 2024

Sci Rep

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“…where λ is the wavelength of line and M is the atomic mass, 656.3 nm and 1 g/mol for H α , respectively. The combination of both of these Gaussian broadenings is a Gaussian profile with a FWHM [33][34][35][36][37]:…”

Section: Electron Densitymentioning

confidence: 99%

Experimental Study of a Rotating Electrode Plasma Reactor for Hydrogen Production from Liquid Petroleum Gas Conversion

et al. 2022

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In this work, a new plasma reactor operating with a butane/propane (C4H10/C3H8) gaseous mixture, designed for hydrogen molecule production, was experimentally studied. This reactor is based on a rotating electrode, biased by an AC high voltage. The plasma discharge was investigated for different AC voltages, rotational frequencies, and gas flow rates. A discharge in the filamentary mode was produced as proved by the electrical characterization. Gas Chromatography (GC) was applied to study the LPG remediation. The maximum conversion factors of 70% and 60% were found for the C3H8 and C4H10, respectively, with an H2 selectivity of 98%. Hydrogen atomic lines from the Balmer series and various molecular bands were detected by optical emission spectroscopy (OES). The stark broadening of the Hα Balmer line was used for the determination of the electron density. The spectra simulation of the C2 band was permitted to obtain the gas temperature while the first five lines of hydrogen atoms were used to calculate the electron temperature. A non-equilibrium plasma with two very different temperatures for electrons and heavy particles was found. The spectroscopic study allowed us to explain the experimental results of the LPG conversion and its dependence on the plasma conditions, resulting in optimizing the H2 formation.

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“…The HG-1 Mercury-Argon lamp was used as the light source. 24 Assuming that the upper level of the selected atomic transitions was under partial local thermodynamic equilibrium (PLTE) conditions, the conventional Boltzmann plot was used to determine the excitation temperature in the discharge medium of both the pulsed and HVAC plasma jets. The relative transition probabilities for different lines are expressed as follows: 25,26 ki where I is the total intensity, A ki is the transition probability, g k is the degeneracy of the upper level, λ ki is the wavelength, E k is the excitation energy, and k is the Boltzmann constant.…”

Section: Optical Emission Spectroscopy Measurementsmentioning

confidence: 99%

Effects of Nonthermal Atmospheric Pressure Plasma Jet on Human Dental Pulp Stem Cells

et al. 2021

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The effects of a nonthermal atmospheric plasma jet with argon and argon/oxygen (Ar/O2) gases on live human dental pulp stem cells (hDPSCs) were studied to verify tooth vitality in the pulp-capping process. Using MTT assay, the surviving hDPSCs after plasma jet exposure for 1, 2, and 3 min were counted. First, for the pulsed plasma jet the frequency varied from 10 to 50 kHz for 5 groups with Ar and 5 groups with Ar/O2 plasma jet. Later, with the alternating current (AC) plasma jet, the voltage was changed between 5.5 and 16.05 kV for 13 groups. The cells in the control group were only exposed to Ar and Ar/O2 gases. To control thermal damage to hDPSCs, optical emission spectroscopy was used. For data analysis, the ANOVA repeated measure was used. There were significant differences between the various frequencies and exposure durations (p < 0.05) for the Ar plasma. For the Ar/O2 gas, there were significant differences between frequencies (p < 0.001). For the AC plasma jet with Ar gas, there were significant differences between voltages (p < 0.001). At the higher pulsed jet frequencies, temperatures increased. Eventually, the suitable durations for root canal disinfection and hDPSC survival with the Ar pulsed jet were 2 and 3 min at 10 and 30 kHz, respectively. Since cold plasma disinfection keeps hDPSCs alive, it can be helpful in promoting tooth survival and durability for pulp capping in clinical treatments.

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Study of the physical discharge properties of a Ar/O2 DC plasma jet

Cited by 6 publications

References 34 publications

Influence of the argon admixture on the reactive oxide species formation inside an atmospheric pressure oxygen plasma jet

Influence of the argon admixture on the reactive oxide species formation inside an atmospheric pressure oxygen plasma jet

Experimental Study of a Rotating Electrode Plasma Reactor for Hydrogen Production from Liquid Petroleum Gas Conversion

Effects of Nonthermal Atmospheric Pressure Plasma Jet on Human Dental Pulp Stem Cells

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