Efficient hydrophilicity improvement of titanium surface by plasma jet in micro-hollow cathode discharge geometry

Jia, Pengying; JIA, Hanxiao; RAN, Junxia; Wu, Kaiyue; Wu, Jiacun; PANG, Xuexia; Li, Xuechen

doi:10.1088/1674-1056/acbde9

Cited by 5 publications

(1 citation statement)

References 67 publications

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“…[1] More importantly, other than in a confined gap between electrodes, the plasma jet can emanate a remote plasma plume abundant with active species in open space. [2,3] Hence, the plasma jet has been extensively used in various application fields, including material synthesis, [4] surface modification, [5,6] ozone generation, [7] water purification, [8] pollutant degradation, [9] methane conversion, [6] light source, [10] sterilization, [11,12] catalysis, [13] and biomedicine, [14] etc.…”

Section: Introductionmentioning

confidence: 99%

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Xu 许,

Gao 高,

Jia 贾

et al. 2024

Chinese Phys. B

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Plasma jet has extensive application potentials in various fields, which normally operates in a diffuse mode when helium is used as the working gas. However, when less expensive argon is used, the plasma jet often operates in a filamentary mode. Compared to the filamentary mode, the diffuse mode is more desirable for applications. Hence, many efforts have been exerted to accomplish the diffuse mode of the argon plasma jet. In this paper, a novel single-needle argon plasma jet is developed to obtain the diffuse mode. It is found that the plasma jet operates in the filamentary mode when the distance from the needle tip to the central line of the argon stream (d) is short. It transits to the diffuse mode with increasing d. For the diffuse mode, there is always one discharge pulse per voltage cycle, which initiates at the rising edge of the positive voltage. For comparison, the number of discharge pulse increases with an increase in the peak voltage for the filamentary mode. Fast photography reveals that the plasma plume in the filamentary mode results from a guided positive streamer, which propagates in the argon stream. However, the plume in the diffuse mode originates from a branched streamer, which propagates in the interfacial layer between the argon stream and the surrounding air. By optical emission spectroscopy, plasma parameters are investigated for the two discharge modes, which show a similar trend with increasing d. The diffuse mode has lower electron temperature, electron density, vibrational temperature, and gas temperature compared to the filamentary mode.

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Section: Introductionmentioning

confidence: 99%

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Xu 许,

Gao 高,

Jia 贾

et al. 2024

Chinese Phys. B

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A planar plume array emanating from an atmospheric pressure argon plasma jet employing floating electrodes

Wu,

Chen,

Ran

et al. 2024

Physics of Plasmas

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Large-scale plasma plumes downstream of plasma jets are in urgent need from a practical viewpoint. In this Letter, an argon plasma jet with floating electrodes is proposed to produce a large-scale planar plume array. Results indicate that with increasing peak voltage (Vp), the planar plume array elongates gradually and scales up in the lateral direction to an optimal value of 90.0 mm. There is only one discharge pulse per voltage half cycle, whose intensity and duration increase with increasing Vp. Moreover, there is a time lag between the initiations of individual plumes. Fast photography reveals that the planar plume array originates from the repeated process of some micro-discharge filaments stretching along the argon stream. By optical emission spectroscopy, the spatial distribution of plasma parameters is obtained, such as electron density, electron temperature, and gas temperature. At last, the planar plume array is employed to test the surface modification of polyethylene terephthalate, for which a uniform modification has been realized with a scan velocity of 1.0 cm/min. These results are of great significance for the development of large-scale atmospheric pressure plasma sources.

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Influence of bias voltage and oxygen addition on the discharge aspects of a diffuse argon plume in an atmospheric pressure plasma jet

JIA 贾,

HAN 韩,

DONG 董

et al. 2024

Plasma Sci. Technol.

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Diffuse plasma plumes are desirable in practical applications in contrast to filamentary ones, which are normally formed downstream of atmospheric pressure plasma jets. In this paper, a diffuse plume is formed through increasing bias voltage (Ub ) applied to the downstream electrode of an argon plasma jet excited by a negatively pulsed voltage. Results indicate that the plume is filamentary when Ub is low, which transits to the diffuse plume with increasing Ub . The discharge initiating at the rising edge of the pulsed voltage attributes to the diffuse plume, while that at the falling edge contributes to the filament in the plume. For the diffuse plume, discharge intensity decreases with increasing oxygen content (Co ). Fast photography reveals that the diffuse plume results from a negative streamer, which has a dark region near the nozzle with Co =0 %. However, the dark region is absent with Co =0.5 %. From optical emission spectrum, electron density, electron excitation temperature, gas temperature, and oxygen atom concentration are investigated. These results are of great importance to the extensive applications of atmospheric pressure plasma jet.

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Efficient hydrophilicity improvement of titanium surface by plasma jet in micro-hollow cathode discharge geometry

Cited by 5 publications

References 67 publications

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

Transition from a filamentary mode to a diffuse one with varying distance from needle to stream of an argon plasma jet

A planar plume array emanating from an atmospheric pressure argon plasma jet employing floating electrodes

Influence of bias voltage and oxygen addition on the discharge aspects of a diffuse argon plume in an atmospheric pressure plasma jet

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