A Cold Atmospheric-Pressure Helium Plasma Generated in Flexible Tubing

Johnson, Valencia S.; Zhu, Weidong; Wang, R.; Re, Justin Lo; Sivaram, Swaminathan; Mahoney, J.; López, José L.

doi:10.1109/tps.2011.2160737

Cited by 18 publications

(8 citation statements)

References 5 publications

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“…Beyond IWs propagating through the dielectric tubes in which they are produced, recent experiments have found that under certain conditions IWs can also propagate across dielectric barriers [17]. This phenomenon, called plasma transfer, here refers to an IW exiting from the source tube, impinging onto the outer surface of a spatially separate and electrodeless second tube, and producing a new IW inside the second tube [18][19][20][21]. (See, for example, figure 1.)…”

Section: Introductionmentioning

confidence: 99%

Atmospheric-pressure plasma transfer across dielectric channels and tubes

Xiong¹,

Robert²,

Sarron³

et al. 2013

J. Phys. D: Appl. Phys.

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Atmospheric-pressure plasma transfer refers to producing an ionization wave (IW) in a tube or channel by impingement of a separately produced IW onto its outer surface. In this paper, we report on numerical and experimental investigations of this plasma transfer phenomenon. The two tubes, source and transfer, are perpendicular to each other in ambient air with a 4 mm separation with both tubes being flushed with Ne or a Ne/Xe gas mixture at 1 atmosphere pressure. The primary IW is generated in the source tube by ns to µs pulses of ±25 kV, while the transfer tube is electrodeless, not electrically connected to the first and at a floating potential. The simulations are conducted using a two-dimensional (2D) plasma hydrodynamics model with radiation transport, where the three-dimensional tubes in the experiments are represented by 2D channels. Simulations and experiments show that the primary IW propagates across the inter-tube gap and upon impingement induces two secondary IWs propagating in opposite directions in the transfer tube. Depending on the polarity of the primary IW in the source tube, the secondary IW in the transfer tube can have polarities either the same or opposite to that of the primary IW. The speed and strength of both the primary and secondary IWs depend on the rate of rise of the voltage pulse in the source tube. The modelling results were found to agree well with the behaviour of plasma transfer observed using nanosecond intensified charge-coupled device imaging.

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Section: Introductionmentioning

confidence: 99%

Atmospheric-pressure plasma transfer across dielectric channels and tubes

Xiong¹,

Robert²,

Sarron³

et al. 2013

J. Phys. D: Appl. Phys.

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“…1). The cold plasma jet reactor was operated using UHP helium feed gas in atmospheric air at a rate of 5.00 standard liters per minute (SLPM), and with an applied alternating current (AC) voltage of 13 kV pk-pk at 28.8 kHz, for a total effective average electrical power usage of 15 watts (Buonopane et al, 2016;Johnson et al, 2011). Treatments consisted of a control of FOB plugs not treated with cold plasma, and FOB plugs treated with cold plasma for periods of 5, 10, or 15 min.…”

Section: Methodsmentioning

confidence: 99%

Cold Plasma Treatment Strategies for the Control of Fusarium oxysporum f. sp. basilici in Sweet Basil

Homa¹,

Barney²,

Davis³

et al. 2021

horts

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Fusarium wilt of basil (FOB), caused by Fusarium oxysporum f. sp. basilici, is an economically damaging disease of field- and greenhouse-grown sweet basil. Growers have observed a resurgence of FOB and susceptibility in FOB-resistant cultivars. Because currently available chemical, biological, and cultural control methods are costly, unsustainable, ineffective, or challenging to implement, new strategies of FOB control are needed. Cold plasma is becoming an increasingly important experimental technology in the food and agricultural industry for pathogen decontamination. To understand the effect of cold plasma treatment on FOB incidence and severity, experiments were conducted by treating FOB mycelium, inoculated sweet basil seedlings, and seeds with various experimental cold plasma treatment devices, all using helium as a feed gas. Initial results indicated that while the cold plasma jet treatment did not result in a significant reduction in mean mycelial growth rate or virulence of the pathogen, direct cold plasma jet treatments on seedlings, as well as a cold plasma dielectric barrier discharge treatment on seeds, did exhibit varying efficacies against FOB. Control of FOB appeared to be strongly dependent on the exposure time to cold plasma. These findings can aid in the standardization of a cold plasma treatment for the commercial basil seed and transplant industry.

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“…Atmosphric pressure plasma jet (APPJ) is a non-thermal plasma. It has acquired a lot of interest because of its flexibility, its ability to create reactive chemical temperatures in adition of its low-cost operation [1].An interesting feature of APPJs is their capacity to infiltrate and spread inside little openings and adaptable dielectric tubes [2]. These facts make the plasma jet very attractive for applications in the biomedical field.…”

Section: -Introductionmentioning

confidence: 99%

“…In the Saha-Boltzmann equation, the same element's spectral lines and successive ionization phases are utilized [7]. The following is the Saha-Boltzmann equation: …………………....…… (2) Where ………………………………………………………………... (3) is the species ionization energy during the ionization stage, E in eV, T z denotes the line force as it descends from level-2 to level-1, and Te is the electron temperature. The addendum z represents the species' ionization phase for the reference.…”

Section: -Introductionmentioning

confidence: 99%

Determination of Electrons Temperature and Density For Ag, Zn, and Cu metals using Plasma jet System at atmospheric pressure

Jihad

Aadim

2022

eijs

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Under atmospheric pressure, an argon plasma stream was sustained and its plasma characteristics were examined. The emission spectra of plasma created in a plasma jet system using argon gas were observed for three metals (Ag, Zn, and Cu) for the anode and varied flow rates ranging from 1–4 L/min. at constant voltage, and normal atmospheric pressure. The spectral lines of excited Ar, Ag, Zn, and Cu species were identified at a wavelength of (650–900) nm .The Debye length, sphere, and temperature of an electron are all measured. Optical emission spectrometer (OES) equipment was used to capture the spectrum produced by the plasma at various argon gas flow rates.The temperature and density of the electron (Te) and (ne) ranges for Ar-gas, Ag, Zn, and Cu-anode increased as the stream pace of argon gas to the plasma made by the release current (D.C.) expanded.(1.241- 1.473)eV and (1.93 x1018–6.38 x1018 ) cm-3 , (1.187– 1.245) eV and (4.32 x1016–6.23 x1016 ) cm-3 , (1.374 -1.631)eV and (4.01 x1018 – 12.1 x1018 ) cm-3 respectively . The intensity of spectral lines, on the other hand, increased.

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A Cold Atmospheric-Pressure Helium Plasma Generated in Flexible Tubing

Cited by 18 publications

References 5 publications

Atmospheric-pressure plasma transfer across dielectric channels and tubes

Atmospheric-pressure plasma transfer across dielectric channels and tubes

Cold Plasma Treatment Strategies for the Control of Fusarium oxysporum f. sp. basilici in Sweet Basil

Determination of Electrons Temperature and Density For Ag, Zn, and Cu metals using Plasma jet System at atmospheric pressure

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