A poly‐diagnostic study of the shield gas‐assisted atmospheric pressure plasma jet propagation upon a dielectric surface

Narimisa, Mehrnoush; Onyshchenko, Iuliia; Morent, Rino; Sobota, Ana

doi:10.1002/ppap.202100247

Cited by 4 publications

(3 citation statements)

References 61 publications

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“…Finally, comparing the argon mass fraction of the second and third row of figure 10(b) implies that when all three channels are supplied with argon gas, a highly homogeneous gas mixture is attained, as argon atoms diffuse effectively. Prior studies have reported that plasma jets tend to propagate towards a higher concentration of the same gas [54]. Thus, when all three channels are filled with argon, the argon from the middle and outer channels reacts substantially in the semiclosed volume inside the cap, effectively mingling with the plasma-generating argon channel, significantly expanding the size of the plasma effluent.…”

Section: Cfd Simulationsmentioning

confidence: 96%

“…In addition to characterizing the plasma temperature, 2D numerical simulations of fluid dynamics are carried out to gain a fundamental understanding on how different gas channels mix and how gas propagates in ambient air. This method has been used before to visualize gas behavior patterns that can subsequently be correlated with plasma propagation [23,54]. The size of the gas channel can be linked to the plasma dimensions, so the mole fraction of argon can indicate where the ignited plasma might spread in the real plasma jet system [55].…”

Section: Cfd Simulationsmentioning

confidence: 99%

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Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing

Narimisa,

Onyshchenko,

Sremački

et al. 2024

Plasma Sources Sci. Technol.

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The quest to employ cold plasma sources at atmospheric pressure in polymer processing has emerged as a potent driving force behind their development. Atmospheric pressure operation of plasma jets provides potential cost reductions as well as easier handling and maintenance.In addition, their unique advantage of remote operation allows the substrate to be placed outside the source boundaries. This latter feature makes it easier to process complex three-dimensional objects and to integrate plasma jets into existing production lines. Although conventional atmospheric pressure plasma jet (APPJ) sources have undergone significant advancements in their design and construction, they have reached their technical and technological thresholds in several domains, thereby also impeding further enhancements in material processing applications. To cope with this issue, this work introduces a promisingAPPJ (named MPPJ3) working in a three co-axial gas layer geometry, incorporating the capability of aerosol and shield gas introduction leading to a configuration rich in reactive plasma species with controllable size and suitable temperature for polymer processing. A parametric study on the novel MPPJ3 device is carried out and plasma characteristics, such as reactive plasma species and temperatures, are determined by means of optical emission spectroscopy (OES), laser scattering, and infrared (IR) camera imaging whereas the fluid dynamics are analyzed using computational fluid dynamics (CFD) and Schlieren imaging. The obtained promising results clearly show the flexibility and adaptability of the MPPJ3 device for polymer processing applications.

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Section: Cfd Simulationsmentioning

confidence: 96%

Section: Cfd Simulationsmentioning

confidence: 99%

Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing

Narimisa,

Onyshchenko,

Sremački

et al. 2024

Plasma Sources Sci. Technol.

Self Cite

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“…However, this method restricts the flexibility of the APPJ application. A more promising approach involves using a coaxial quartz tube to create an annular space for the APPJ, where a selected gas composition is supplied to shield the ambient air [16,17,[21][22][23][24]. Shielding gas can also control the plasma chemistry to produce ROS or RNS.…”

Section: Introductionmentioning

confidence: 99%

Investigation of electric field distribution on dielectric exposed to DC-pulsed He plasma jet with shielding gas

Liu,

Xia,

Shang

et al. 2023

J. Phys. D: Appl. Phys.

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Atmospheric pressure plasma jets (APPJs) produce reactive species and electric fields for biomedical applications. Gas shields control plasma plume-surrounding gas interactions, regulating reactive species generation and electric field strength. However, the surface electric field distribution is still unclear and needs urgent attention. Here, the electric field distribution on the surface exposed to a helium APPJ with shielding gas is investigated using the Pockels technique. This study considers the influence of the type of shielding gas (ambient air, dry air, nitrogen, oxygen, nitrogen-oxygen mixture) and the flow rate (2000–6000 sccm). The results show that the surface electric field develops in three phases: establishment, maintenance, and dissipation. Both flow rate and oxygen content of the shielding gas significantly influence surface discharge behavior and the maximum electric field value. The analysis suggests that the establishment phase of the electric field results from charge transfer by ionization waves to the dielectric, while the maintenance of the electric field depends on pulse duration. During the dissipation phase, the positive surface charge attracts negatively charged species to the surface (electrons and negative ions), which causes charge neutralization at the surface. The oxygen content in the shielding gas impacts the electric field establishment phase, with a low oxygen content leading to lower photo-ionization rates and, consequently, surface discharges with branching. Shielding gas flow rates affect the amount of shielding gas mixed into the helium channel. Mixing less oxygen into the APPJ increases the electric field strength, as the ionization potential is lower than nitrogen. Excessive oxygen mixing traps more free electrons due to electronegativity, causing fewer ionized collisions and more negative ions in APPJ, ultimately lowering the electric field strength. This study shows that shielding gas type and flow rates can adjust surface charging, aiding in optimizing biomedical APPJ.

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Generation of Multiple Jet Capillaries in Advanced Dielectric Barrier Discharge for Large-Scale Plasma Jets

Nguyen,

Saud,

Trinh

et al. 2023

Plasma Chem Plasma Process

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Multiple Ar jet capillaries (4 jets) were successfully generated by an advanced dielectric barrier discharge reactor. The advanced reactor consisted of two ring-shaped electrodes (thickness of 0.5 mm) covering the 4-bore quartz tubing (bore diameters of 1 mm; outer diameter of 6 mm), and two electrodes had a gap of 6 mm and were isolated by immersing it to liquid dielectric to prevent arcing between two electrodes and high performance of plasma jet. The performance of multiple Ar jet capillaries by the advanced reactor demonstrated less consumption of Ar gas (1-3 L/min) for obtaining total π mm 2 cross-section area of plasma jets conjugated with jet temperatures not over 40°C; the temperature is suitable for implementing plasma to bio-applications. Furthermore, the plasma jet spread when it interreacted with a surface (dielectric materials, skin); consequently, the surface-effected plasma jet up to an area square of 8 mm 2 . Analysis of optical emissions spectra of the multiple Ar jet capillaries indicated that the jet sources consist of reactivated species and proposed that the plasma device has potential for applications in bioapplications and materials treatments.

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A poly‐diagnostic study of the shield gas‐assisted atmospheric pressure plasma jet propagation upon a dielectric surface

Abstract: The significance of shield gases on atmospheric pressure plasma jet (APPJ) propagation over a horizontal dielectric surface using various diagnostic methods has been investigated. The obtained results imply that adding nitrogen as a shield gas only has an impact on the N 2 reactive

Cited by 4 publications

References 61 publications

Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing

Diagnostics and characterization of a novel multi gas layer RF atmospheric pressure plasma jet for polymer processing

Investigation of electric field distribution on dielectric exposed to DC-pulsed He plasma jet with shielding gas

Generation of Multiple Jet Capillaries in Advanced Dielectric Barrier Discharge for Large-Scale Plasma Jets

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