Atmospheric Pressure 2.45-GHz Microwave Helium Plasma

Güleç, Ali; Bozduman, Ferhat; Hala, Ahmed

doi:10.1109/tps.2015.2403280

Cited by 15 publications

(4 citation statements)

References 15 publications

(18 reference statements)

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“…The spectroscopic data related to the wavelengths of excited atoms and ions were confirmed via the NIST atomic database [28]. By adding argon gas, the contributed wavelengths of helium [27] for the estimation of electron temperature weakened; therefore, the wavelengths of argon [12] were used at the flow rate of 400 to 2000 sccm.…”

Section: Measurements Of Gas Temperaturementioning

confidence: 99%

“…The production of hydroxyl might be explained by two possible different mechanisms The Boltzmann plot equation is assumed to be ln(Iλ/gA) = −E/kT e + constant, where I is the measured intensity obtained by OES, λ is the selected wavelength associated with helium and argon gases, g is the statistical weight, A is the transition probability, E is the excitation energy corresponding to the selected wavelengths, k is Boltzmann constant, and T e is electron temperature. The selected wavelengths of atomic emission lines related to argon and helium gases were obtained from references [12,27] to estimate the electron temperature based on the Boltzmann plot. The spectroscopic data related to the wavelengths of excited atoms and ions were confirmed via the NIST atomic database [28].…”

Section: Measurements Of Electron Density and Electron Temperaturementioning

confidence: 99%

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Emission Spectroscopic Characterization of a Helium Atmospheric Pressure Plasma Jet with Various Mixtures of Argon Gas in the Presence and the Absence of De-Ionized Water as a Target

Bolouki

Hsieh

Li³

et al. 2019

Plasma

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A helium-based atmospheric pressure plasma jet (APPJ) with various flow rates of argon gas as a variable working gas was characterized by utilizing optical emission spectroscopy (OES) alongside the plasma jet. The spectroscopic characterization was performed through plasma exposure in direct and indirect interaction with and without de-ionized (DI) water. The electron density and electron temperature, which were estimated by Stark broadening of atomic hydrogen (486.1 nm) and the Boltzmann plot, were investigated as a function of the flow rate of argon gas. The spectra obtained by OES indicate that the hydroxyl concentrations reached a maximum value in the case of direct interaction with DI water as well as upstream of the plasma jet for all cases. The relative intensities of hydroxyl were optimized by changing the flow rate of argon gas.

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Section: Measurements Of Gas Temperaturementioning

confidence: 99%

Section: Measurements Of Electron Density and Electron Temperaturementioning

confidence: 99%

Emission Spectroscopic Characterization of a Helium Atmospheric Pressure Plasma Jet with Various Mixtures of Argon Gas in the Presence and the Absence of De-Ionized Water as a Target

Bolouki

Hsieh

Li³

et al. 2019

Plasma

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“…The various techniques to measure gas temperature include optical emission spectroscopy (OES) [1,[6][7][8][9][10][11][12][13][14][15], infrared thermometry [1,[16][17][18], millimetre wave interferometry [19], Schlieren [1,5], Rayleigh scattering [20,21], thermocouple [1,11,22,23], and fibre optic based thermometry [24,25]. These have been applied to a varying degree in different plasma systems including plasma torch [15,26,27], dielectric barrier discharge [1,7,14,18,19], plasma jet [5,8,9,16,20,24,27,28], gliding arc discharge, [2,17,25] and glow discharge [21].…”

Section: Introductionmentioning

confidence: 99%

Continuous gas temperature measurement of cold plasma jets containing microdroplets, using a focussed spot IR sensor

Hendawy

McQuaid

Mariotti

et al. 2020

Plasma Sources Sci. Technol.

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Controlling gas temperature via continuous monitoring is essential in various plasma applications especially for biomedical treatments and nanomaterial synthesis but traditional techniques have limitations due to low accuracy, high cost or experimental complexity. We demonstrate continuous high-accuracy gas temperature measurements of low-temperature atmospheric pressure plasma jets using a small focal spot infrared sensor directed at the outer quartz wall of the plasma. The impact of heat transfer across the capillary tube was determined using calibration measurements of the inner wall temperature. Measured gas temperatures varied from 25 °C–50 °C, increasing with absorbed power and decreased gas flow. The introduction into the plasma of a stream (∼105 s−1) of microdroplets, in the size range 12 μm–15 μm, led to a reduction in gas temperature of up to 10 °C, for the same absorbed power. This is an important parameter in determining droplet evaporation and its impact on plasma chemistry.

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“…lines derived from the OES measurement could be used for the determination of electron temperature. But, for a plasma in non-LTE this method could give an approximation of excitation temperature (T exc ) [42,43]. Intensities from several excited helium lines (471.31 nm, 492.19 nm, 501.57 nm, 587.56 nm, 667.80 nm, 706.52 nm and 728.13 nm) were included in the model assuming a Boltzmann distribution of the population of the atomic level as [42]: ln…”

Section: Electron Densitymentioning

confidence: 99%

Contrasting the characteristics of atmospheric pressure plasma jets operated with single and double dielectric material: physicochemical characteristics and application to bacterial killing

Ghimire¹,

Briggs²,

Sysoeva³

et al. 2023

J. Phys. D: Appl. Phys.

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This study reports an experimental study of two types of plasma jets in terms of their fundamental plasma characteristics and efficacy in bacterial sterilization. The plasma jets are fabricated by inserting a high voltage electrode inside a one-end closed (double DBD plasma jet) or both ends open (single DBD plasma jet) quartz tubes which are further enclosed inside a second quartz tube containing a ground electrode. Both plasma jets are operated in contact with water surface by using a unipolar pulsed DC power supply with helium as the working gas. Results from electrical and time-resolved imaging show that the single DBD configuration induces 3-4 times higher accumulation of charges onto the water surface with significantly faster propagation of plasma bullets. These results are accompanied by the higher discharge intensity as well as stronger emissions from short-lived reactive species which were analyzed through optical emission spectroscopy at the plasma-water interface. The rotational temperature for the single DBD configuration was observed to be higher making it unsafe for direct treatments of sensitive biological targets. These characteristics of the single DBD configuration result in the production of more than two times higher concentration of H$_2$O$_2$ in plasma activated water. Our results suggest that the shielding of the HV electrode reduces the plasma potential which in turn reduces the electric field \& electron energy at the plasma-water interface. The reduced electric field for the double DBD configuration was lower by $\approx$463Td than the single DBD configuration. The bactericidal efficacy of the two configurations of the plasma jets were tested against \textit{Escherichia coli}, a well studied Gram-negative bacterium that can be commensal and pathogenic in human body. Our results demonstrate that although single DBD plasma jet result in stronger antibacterial effects, the double DBD configuration could be safer.

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Atmospheric Pressure 2.45-GHz Microwave Helium Plasma

Cited by 15 publications

References 15 publications

Emission Spectroscopic Characterization of a Helium Atmospheric Pressure Plasma Jet with Various Mixtures of Argon Gas in the Presence and the Absence of De-Ionized Water as a Target

Emission Spectroscopic Characterization of a Helium Atmospheric Pressure Plasma Jet with Various Mixtures of Argon Gas in the Presence and the Absence of De-Ionized Water as a Target

Continuous gas temperature measurement of cold plasma jets containing microdroplets, using a focussed spot IR sensor

Contrasting the characteristics of atmospheric pressure plasma jets operated with single and double dielectric material: physicochemical characteristics and application to bacterial killing

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