Spatial Distribution of Wettability in Aluminum Surfaces Treated with an Atmospheric-Pressure Remote-Plasma

Muñoz, J.; Rincón, Rocío; Calzada, M. D.

doi:10.3390/met9090937

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…Its color was akin to the nitrogen orange afterglow [30,31]. Contrary to the expectations based on the appearance of Ar/N 2 capillary discharges with visible nitrogen afterglow [31][32][33], the diffuse plasma was not present directly below the constricted filament but on its sides, creating a double plume structure (total diameter of 15-20 mm).…”

Section: Self-organization Patternsmentioning

confidence: 63%

Self-organization phenomena in cold atmospheric pressure plasma slit jet

Polášková¹,

Nečas²,

Dostál³

et al. 2022

Plasma Sources Sci. Technol.

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The RF plasma slit jet, which produces 150 mm wide streaming plasma outside the jet body, exhibits exciting self-organization phenomena that resemble the self-organized patterns of dielectric barrier discharge (DBD) ﬁlaments. Similarly, as in DBD, the ﬁlaments are surrounded by an inhibition zone that does not allow two ﬁlaments to come closer to each other. With fast camera imaging, we observed the ﬁlamentary character of the discharge in all the studied gas feeds (Ar, Ar/N2, and Ar/O2). Still, the visual appearance of the ﬁlaments in the plasma and their interaction with a dielectric surface depended signiﬁcantly on the gas feed. As the breakdown voltage in pure Ar is relatively low compared to the applied one, new ﬁlaments form frequently. Such newly created ﬁlaments disrupted the characteristic inter-ﬁlament distance, forcing the system to rearrange. The frequent ignition and decay processes in Ar led to short ﬁlament lifetimes (0.020–0.035 s) and their high jitter speed (0.9–1.7 m/s), as determined with an image processing custom code based on Gwyddion libraries. The number of ﬁlaments was lower in the Ar/O2 and Ar/N2 mixtures. It was attributed to a loss of energy in the excitation of rotational and vibrational levels and oxygen electronegativity. Since the probability of low-current side discharges transitioning into the full plasma ﬁlaments was limited in these gas mixtures, the self-organized pattern was seldom disrupted, leading to lesser movement and longer lifetimes. Unlike in Ar or Ar/O2, the constricted ﬁlaments in Ar/N2 were surrounded by diﬀuse plasma plumes, likely connected to the presence of long-lived nitrogen species. We demonstrated in the polypropylene treatment that the self-organization phenomena aﬀected the treatment uniformity.

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Section: Self-organization Patternsmentioning

confidence: 63%

Self-organization phenomena in cold atmospheric pressure plasma slit jet

Polášková¹,

Nečas²,

Dostál³

et al. 2022

Plasma Sources Sci. Technol.

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“…The application of low-temperature air-plasma treatment on an organic-inorganic halide perovskite film was investigated using diffuse coplanar surface barrier discharge (DCSBD) at 70 • C [1]. An aluminum surface was treated and the wettability distribution was experimentally investigated using an atmospheric-pressure remote plasma [2]. Spark plasma sintering and a selective laser melting technique were used in combination to fabricate TiO 2 /Ag ceramics and Ti 6 Al 4 V-TiO 2 /Ag composites.…”

Section: Contributionsmentioning

confidence: 99%

Plasmas Processes Applied on Metals and Alloys

Chen

Chang

2020

Metals

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Time evolution of atomic nitrogen density in pure-nitrogen-pulsed barrier discharge at sub-atmospheric pressure

Nakagawa

Yoshii

Tochikubo

2022

Journal of Applied Physics

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Ground state atomic nitrogen N([Formula: see text]) was analyzed using two-photon absorption laser-induced fluorescence (TALIF) in sub-atmospheric pressure nitrogen pulsed barrier discharge under needle-to-hemisphere electrode configuration. By reducing the pressure from 90 to 30 kPa, the discharge form transitioned from multiple filaments to a single column, improving the reacting region uniformity. The TALIF measurement revealed that the amount of atomic nitrogen near the needle anode increased over tens of microseconds after the discharge, and this N-production during afterglow was enhanced by reducing the pressure. Reducing the pressure from 90 to 30 kPa extended the half-life period of atomic nitrogen near the anode by 350 [Formula: see text], while maintaining the peak amount of atomic nitrogen. The lifetime extension with the same amount of atomic nitrogen helped improving the chemical activity near the anode. The origin of the N-production during afterglow was not identified as a single factor, but its time constant indicated the contribution of N[Formula: see text] quenched by the ground state atomic nitrogen, along with the quenching of N[Formula: see text], which was previously considered as a major source of afterglow production of the ground state atomic nitrogen. Under 30 kPa, higher discharge energy resulted in faster and larger amount of atomic nitrogen production during afterglow, which indicates the involvement of highly excited particles including metastable atomic nitrogen. In contrast, the decay rate of atomic nitrogen did not depend on the discharge energy. This suggests that the increasing discharge energy broadens the N-productive region while maintaining the local N density.

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Spatial Distribution of Wettability in Aluminum Surfaces Treated with an Atmospheric-Pressure Remote-Plasma

Cited by 4 publications

References 34 publications

Self-organization phenomena in cold atmospheric pressure plasma slit jet

Self-organization phenomena in cold atmospheric pressure plasma slit jet

Plasmas Processes Applied on Metals and Alloys

Time evolution of atomic nitrogen density in pure-nitrogen-pulsed barrier discharge at sub-atmospheric pressure

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