Self-organized patterns by a DC pin liquid anode discharge in ambient air: Effect of liquid types on formation

Zhang, Shiqiang; Dufour, Thierry

doi:10.1063/1.5030099

Cited by 32 publications

(34 citation statements)

References 78 publications

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“…However, under water anode conditions, the discharge is glow, and the plasma is diffuse. Zhang et al [36] investigated the structure and properties of an air discharge in contact with various electrolytes (water with HCl, HF, or H 2 SO 4 ), and they always observed a dark zone above the electrolyte surface, irrespective of its nature. The observations of Zhang et al [36] are consistent with those of Liu et al [30], as well as with the ICCD images recorded herein under anode water polarity conditions.…”

Section: Discussionmentioning

confidence: 99%

“…The fundamental analysis of these emission patterns is of great importance due to their effect on the local production and transport of reactive species. The mechanisms involved in the structuration process are not well understood; however, it has been established that oxygen species [34], injected power [30,32], water polarity [35], and other water properties (composition, acidity, conductivity) [36] play an essential role in this process.…”

Section: Introductionmentioning

confidence: 99%

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Time and space-resolved imaging of an AC air discharge in contact with water

Diamond

Hamdan

Profili

et al. 2020

J. Phys. D: Appl. Phys.

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Numerous physical and chemical phenomena are involved in liquid plasmas. These phenomena are highly sensitive to the plasma source and to experimental conditions. In this study, we investigate the temporal dynamics of an AC-sustained plasma produced in air by a discharge between a pin electrode and water. Depending on the gap distance (d), a discharge transition is observed at d = 4.5 mm. At d < 4.5 mm, voltage drop is observed during both positive and negative half-periods (i.e. when water is cathode and anode, respectively). Meanwhile, at d > 4.5 mm, voltage drop is observed only during the negative half-period (i.e. when water is anode). Before transition and when water is cathode, the plasma emission in the gap space consists of two components: a conical-like emission at the water surface and a cylindrical-like emission in the gap. When water is anode, strong emission is observed at the electrode pin, along with a disc-like emission at the water surface. Increasing d beyond 4.5 mm (i.e. after transition) modifies the emission structure at the water surface, forming an inner homogeneous spot at the center of an outer ring. The temporal evolution of the emission in the gap and at the water surface is also discussed, and its relationship with the injected power is assessed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time and space-resolved imaging of an AC air discharge in contact with water

Diamond

Hamdan

Profili

et al. 2020

J. Phys. D: Appl. Phys.

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“…A slight increase in the plasma length brings about significant pattern changes in the morphology, as shown on the far‐right side of Figure 6a. Because gap distance is another major factor affecting SOPs, [ 9 ] we moved on to study the pattern formation and plasma properties at different gap distances.…”

Section: Resultsmentioning

confidence: 99%

“…Experiments carried out for self-organization using liquid electrodes have reported that pattern formation depends on operating condition parameters such as discharge current, gas flow rate, gap distance, conductivity, anode polarity of the liquid, and liquid types. [1][2][3][4][5][6][7][8][9][10] These parameters can also cause changes in the plasma. Exploring the changes in the physical properties of the plasma in these processes can help gain a deeper understanding of pattern formation.…”

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confidence: 99%

Self‐organized pattern formation and plasma diagnosis in atmospheric pressure helium glow discharges with a liquid anode

Qin,

Feng,

Wang

et al. 2023

Plasma Processes & Polymers

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A negative DC high voltage is used to generate plasma at ambient condition. Self‐organized patterns (SOPs) are formed on the surfaces of the liquid anodes. With increased current or gap distance or reduced gas flow rate, the diameters of SOPs increase and SOPs become more complex, coinciding along with an increases of gas temperature and plasma radius and a decrease of electron density. Both plasma expansion and liquid evaporation in terms of gas temperature, lead to a drop of electron density and pattern formation. Our research elucidates the correlation between SOPs evolution and plasma properties and clarifies the physical process of SOPs formation based on the interaction between atmospheric pressure plasma and liquid anodes.

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“…In physics, many examples illustrate selforganization processes, including arrangement of ferromagnetic objects and films [27,28] , quantum particles at zero temperature in optical lattice [29] , systems near the rigidity percolation threshold [30] , etc. In the specific research field of cold plasma physics, selforganized patterns have also been highlighted in cathode boundary layer micro-discharges [31] , DC pin electrodes interacting with liquids [ 32] , high power impulse magnetron sputtering [33] .…”

Section: Self-organizationmentioning

confidence: 99%

From Repeatability to Self-Organization of Guided Streamers Propagating in a Jet of Cold Plasma

Decauchy

Dufour

2023

Plasma

Self Cite

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In this work, a jet of cold plasma is generated in a device supplied in helium and powered with a high-voltage nanopulse power supply, hence generating guided streamers. We focus on the interaction between these guided streamers and two targets placed in a series: a metal mesh target (MM) at floating potential followed by a metal plate target (MP) grounded by a 1500 Ω resistor. We demonstrate that such an experimental setup allows to shift from a physics of streamer repeatability to a physics of streamer self-organization, i.e., from the repetition of guided streamers that exhibit fixed spatiotemporal constants to the emergence of self-organized guided streamers, each of which is generated on the rising edge of a high-voltage pulse. Up to five positive guided streamers can be self-organized one after the other, all distinct in space and time. While self-organization occurs in the capillary and up to the MM target, we also demonstrate the existence of transient emissive phenomena in the inter-target region, especially a filamentary discharge whose generation is directly correlated with complexity order Ω. The mechanisms of the self-organized guided streamers are deciphered by correlating their optical and electrical properties measured by fast ICCD camera and current-voltage probes, respectively. For the sake of clarity, special attention is paid to the case where three self-organized guided streamers (α, β and γ) propagate at vα = 75.7 km·s–1, vβ = 66.5 km·s–1 and vγ = 58.2 km·s–1), before being accelerated in the vicinity of the MM target.

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Self-organized patterns by a DC pin liquid anode discharge in ambient air: Effect of liquid types on formation

Cited by 32 publications

References 78 publications

Time and space-resolved imaging of an AC air discharge in contact with water

Time and space-resolved imaging of an AC air discharge in contact with water

Self‐organized pattern formation and plasma diagnosis in atmospheric pressure helium glow discharges with a liquid anode

From Repeatability to Self-Organization of Guided Streamers Propagating in a Jet of Cold Plasma

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