Modeling characterisation of a bipolar pulsed discharge

Zajı́čková, Lenka; Sugimoto, Satoshi; Harumningtyas, Anjar Anggraini; Hamaguchi, Satoshi

doi:10.1088/1361-6595/abb321

Cited by 7 publications

(3 citation statements)

References 97 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, the discharge initiation voltage of the negative polarity is higher than that of the positive polarity in the creepage discharge [32,33]. This phenomenon is attributed to the strength of the spatial electric field formed by the ionized electrons and positive ions and the polarity of the applied voltage [34][35][36]. Specifically, when the applied voltage is negative, the strength of the electric field around it is weakened by the charged particles, resulting in a higher discharge voltage compared to when a positive voltage is applied.…”

Section: Discussionmentioning

confidence: 99%

Studies on the Control of Dermanyssus gallinae via High-Voltage Impulse

et al. 2023

View full text Add to dashboard Cite

Dermanyssus gallinae, a parasitic mite that subsists on the avian blood of chickens, poses a considerable threat to the poultry industry. D. gallinae infestation can result in a plethora of detrimental effects for the host birds, including decreased egg production and anemia. Pyrethroid pesticides have been the primary means of combating this issue and have demonstrated high levels of efficacy. However, in recent years, D. gallinae has exhibited resistance to these chemicals, resulting in a marked decrease in their mortality; thus, an integrated control strategy in addition to the chemical use should be required for the sustainable control of this mite. This study confirms that D. gallinae can be effectively controlled through the utilization of high-voltage impulse discharges and that various electrical parameters possess optimal values that are required for mite control. The alterations in the body surface of the mite caused by high-voltage impulses were akin to those caused by heat, but no alteration in the elemental composition of the body surface was observed, suggesting a change in organization caused by currents flowing inside the exoskeleton. Comparatively, the mite control efficacy of high-voltage impulse was found to be substantially superior to that of ultraviolet light or ozone, with up to 95% more mites being killed in as little as 30 seconds.

show abstract

Section: Discussionmentioning

confidence: 99%

Studies on the Control of Dermanyssus gallinae via High-Voltage Impulse

et al. 2023

View full text Add to dashboard Cite

show abstract

“…1 A. The details of the system are described elsewhere 11 – 14 . The β-TCP disks were placed on the bottom metal (molybdenum) electrode, 190 mm in diameter, connected to the bipolar high-voltage power supply.…”

Section: Methodsmentioning

confidence: 99%

Amine modification of calcium phosphate by low-pressure plasma for bone regeneration

Kodama

Harumningtyas

Ito

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

Regeneration of large bone defects caused by trauma or tumor resection remains one of the biggest challenges in orthopedic surgery. Because of the limited availability of autograft material, the use of artificial bone is prevalent; however, the primary role of currently available artificial bone is restricted to acting as a bone graft extender owing to the lack of osteogenic ability. To explore whether surface modification might enhance artificial bone functionality, in this study we applied low-pressure plasma technology as next-generation surface treatment and processing strategy to chemically (amine) modify the surface of beta-tricalcium phosphate (β-TCP) artificial bone using a CH4/N2/He gas mixture. Plasma-treated β-TCP exhibited significantly enhanced hydrophilicity, facilitating the deep infiltration of cells into interconnected porous β-TCP. Additionally, cell adhesion and osteogenic differentiation on the plasma-treated artificial bone surfaces were also enhanced. Furthermore, in a rat calvarial defect model, the plasma treatment afforded high bone regeneration capacity. Together, these results suggest that amine modification of artificial bone by plasma technology can provide a high osteogenic ability and represents a promising strategy for resolving current clinical limitations regarding the use of artificial bone.

show abstract

“…Bipolar pulse discharges with sufficiently low duty cycle can be used for such low-temperature processes, especially when arcing at the edge shape of the sample must be avoided. Discharges generated with different short pulse waveforms have found applications in plasma nitriding by generating reactive species at ambient pressure and temperature [34]. However, the effects of pulse frequency on the surface properties and corrosion resistance of Ti-6Al-4V alloy in artificial saliva have not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of pulse frequency on the surface properties and corrosion resistance of a plasma-nitrided Ti-6Al-4V alloy

Kaewnisai,

Chingsungnoen,

Poolcharounsin

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

In this work, Ti-6Al-4V alloy, commonly used as implant material in biomedical applications, was treated by plasma nitriding. The nitriding process was carried out using an N2-H2 plasma (1000:500 sccm) at an operating pressure of about 866 Pa. The current regulation was about 1.8 A, the negative voltage was about 480-500 V, and the power was 840-940 W. The nitriding temperature was maintained at 650±5 ºC, and the nitriding time was 240 min. Bipolar pulse frequencies were varied at 25, 50, 100, 150, and 200 kHz. Analysis by grazing incidence X-ray diffraction spectrometer (GI-XRD) revealed the presence of δ-TiN and ε-Ti2N phases in all nitrided samples. The hardness depth profile was measured with a penetration depth of about 5 nm using the enhanced stiffness procedure (ESP). The results showed that all the nitrided samples had a surface hardness approximately three times that of the unnitrided sample. This result is consistent with that from glow discharge emission spectroscopy (GD-OES), which confirmed the diffusion distance of nitrogen atoms from the surface of about 5 μm. After plasma nitriding, the surface roughness tended to increase, resulting in an increase in the water contact angle (WCA) and a decrease in the work of adhesion. The specific wear rate (ball-on-disk) of all nitrided samples decreased and was significantly lower at a bipolar pulse frequency of 50 kHz. This result is consistent with the stability of the coefficient of friction (CoF) after 6000 sliding cycles. Moreover, the nitrided sample at 50 kHz exhibited the lowest corrosion current density in artificial saliva based on the Tafel potential polarization method.

show abstract

Modeling characterisation of a bipolar pulsed discharge

Cited by 7 publications

References 97 publications

Studies on the Control of Dermanyssus gallinae via High-Voltage Impulse

Studies on the Control of Dermanyssus gallinae via High-Voltage Impulse

Amine modification of calcium phosphate by low-pressure plasma for bone regeneration

Effect of pulse frequency on the surface properties and corrosion resistance of a plasma-nitrided Ti-6Al-4V alloy

Contact Info

Product

Resources

About