Self-prevention of instability in a low-power microwave Ar plasma jet for biomedical applications

Lee, H W; Kim, M S; Won, I. H.; Yun, Gunsu; Lee, J K

doi:10.1088/0022-3727/48/15/155203

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…The electrical characteristics of the co-axial-type plasma generator are measured using a current probe (Tektronix TCP0030A) and a voltage probe (Tektronix P6015A), which are connected to the grounded and power electrodes, respectively, and are recorded by a digital oscilloscope (Tektronix DPO4034); while the current passing through the copper mesh (I mesh ) is determined based on the measured voltage across a 100 Ω resistance connected between the copper mesh and the ground [31,32], as shown in figure 2(a). For comparing the characteristics of the RF-APGD plasma jets with or without the grounded mesh electrode under the same power level, the RF power input is monitored and measured by a Z-scan (Type 3155135-003, Advanced Energy Industries, Inc.), and is kept to be constant by a slight adjustment of the discharge current or the matching network if necessary.…”

Section: Descriptions On the Experimental Platformmentioning

confidence: 99%

Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration

Khan

et al. 2019

Plasma Sci. Technol.

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Cold atmospheric plasma (CAP) jet has wide applications in various fields including advanced materials synthesis and modifications, biomedicine, environmental protection and energy saving, etc. Appropriate control on the volume, temperature and chemically reactive species concentrations of the CAP jet is of great importance in actual applications. In this paper, an radio-frequency atmospheric-pressure glow discharge (RF-APGD) plasma generator with a hybrid cross-linear-field electrode configuration is proposed. The experimental results show that, with the aid of the copper mesh located at the downstream of the traditional co-axial-type plasma generator with a cross-field electrode configuration, a linear field between the inner powered electrode of the traditional plasma generator and the copper mesh can be established. This linerfield can, to some extent, enhance the discharges at the upstream of the copper mesh, resulting in small increments (all less than 12.5%) of the species emission intensities, electron excitation temperatures and gas temperatures by keeping other parameters being unchanged. And due to the intrinsic transparent and conducting features of the grounded copper mesh to the gas flowing, electric current and heat flux of the plasma plumes, a plasma region with higher concentrations of chemically reactive species and larger plasma plume diameters is obtained at the downstream of the grounded copper mesh on the same level of the gas temperature and electron excitation temperature compared to those of the plasma free jet. In addition, the charged particle number densities at the same downstream axial location of the grounded copper mesh decrease significantly compared to those of the plasma free jet. This means that the copper mesh is also, to some extent, helpful for separating the chemically reactive neutral species from the charged particles inside a plasma environment. The preceding results indicate that the cross-linear-field electrode configuration of the plasma generator is an effective approach for tuning the characteristics of the RF-APGD plasma jet in order to obtain an appropriate combination of the plasma jet properties with higher chemically reactive species concentrations, especially relative higher number densities of neutral species, larger plasma volumes and lower gas temperatures.

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Section: Descriptions On the Experimental Platformmentioning

confidence: 99%

Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration

Khan

et al. 2019

Plasma Sci. Technol.

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“…The most common gas (air) has been used in glow discharge plasma for biomedical application [ 109 ]. Inert gas sources, e.g., Ar [ 110 , 111 ] and He [ 112 ] plasma, show a lot of advantages for biomedical applications: they are stable, low-cost, simple, and have enhanced plasma chemical activity. Apart from inert gas, Pandiyaraj et al [ 113 ] investigated the surface properties of TiO 2 /PET films modified by O 2 plasma which showed enhanced hydrophilicity, no cytotoxicity, and antibacterial activity.…”

Section: Physical Surface Modification Of Biomedical Alloysmentioning

confidence: 99%

Biomedical Alloys and Physical Surface Modifications: A Mini-Review

Yan

Cao

2021

Materials

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Biomedical alloys are essential parts of modern biomedical applications. However, they cannot satisfy the increasing requirements for large-scale production owing to the degradation of metals. Physical surface modification could be an effective way to enhance their biofunctionality. The main goal of this review is to emphasize the importance of the physical surface modification of biomedical alloys. In this review, we compare the properties of several common biomedical alloys, including stainless steel, Co–Cr, and Ti alloys. Then, we introduce the principle and applications of some popular physical surface modifications, such as thermal spraying, glow discharge plasma, ion implantation, ultrasonic nanocrystal surface modification, and physical vapor deposition. The importance of physical surface modifications in improving the biofunctionality of biomedical alloys is revealed. Future studies could focus on the development of novel coating materials and the integration of various approaches.

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“…These advantages provide the thruster with high potential for high-precision space science missions. In our recent work, we utilize a coaxial transmission line resonator (CTLR) to feed the microwave power into the thruster [5][6][7], as shown in figure 1. Microwave of a specific frequency is introduced from the side port of the resonator, and generates quasi-neutral plasma in the near-anode region.…”

Section: Introductionmentioning

confidence: 99%

Study on the ionization and acceleration of a microwave discharge cusped field thruster

Zhang¹,

Liu²,

Huang³

et al. 2023

J. Phys. D: Appl. Phys.

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The microwave discharge cusped field thruster (MD-CFT) is a novel concept electric micro propulsion device, also a candidate thruster for the gravitational detection mission. A coaxial transmission line resonator (CTLR) is utilized to feed the microwave into the thruster to generate Xe plasma steadily with a mass flow rate as low as 0.1sccm. Due to the separation of ionization and acceleration, the thruster performs high operation mode stability over a wide range of voltage in low mass flow conditions. Experimental and simulation methods are carried out to study the ionization and ion acceleration of the thruster. The results show that in operating conditions with a mass flow rate of 0.1sccm, an anode voltage of 0V to 1000V, and a microwave power of 2W, the right-hand circularly polarized wave (R wave) and the ordinary wave (O wave) play the most important role in the ionization process. The ion acceleration region locates around the exit magnetic separatrix, and the acceleration region tends to converge toward the separatrix as the anode voltage increases, resulting in an increased focus of the thruster plume and concentration of the ion energy distribution. Due to the separation of the ionization and acceleration regions, the thruster performs a divergence efficiency of 0.5-0.8, and an acceleration efficiency of 0.9.

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Self-prevention of instability in a low-power microwave Ar plasma jet for biomedical applications

Cited by 11 publications

References 35 publications

Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration

Characteristics of a radio-frequency cold atmospheric plasma jet produced with a hybrid cross-linear-field electrode configuration

Biomedical Alloys and Physical Surface Modifications: A Mini-Review

Study on the ionization and acceleration of a microwave discharge cusped field thruster

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