Atmospheric pressure plasma jet impinging on fiber arrays: Penetration pattern determined by fiber spacing

Applied Physics Letters, Journal Year: 2023, Volume and Issue: 122(8)

Published: Feb. 20, 2023

Atmospheric pressure cold plasmas have great potential for surface functionalization, and the interaction between fibers is essential to understand underlying physics. In this Letter, penetration pattern mechanism of an atmospheric plasma jet (APPJ) interacting with different spacing fiber scaffolds were studied by both experiment modeling. The intensified charge coupled device images showed that APPJ induced a radial streamer on windward side scaffold another axial forward opposite side. Propagation distance streamers diminished as decreased. Similar trends predicted 2D fluid model. simulation results indicated high electrical field carried head in was allowed pass through gap large scaffold, while it blocked intensity charges at small spacing. Instead, one generated latter case. physical insight array Letter may contribute improve treatment uniformity technology.

Language: Английский

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Enabling highly tensile insulating aramid-epoxy composites via interface co-valent bonding

Composites Science and Technology, Journal Year: 2023, Volume and Issue: 242, P. 110217 - 110217

Published: Aug. 15, 2023

Language: Английский

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Enhanced plasma jet generation through numerical integration and dielectric influence analysis

AIP Advances, Journal Year: 2024, Volume and Issue: 14(1)

Published: Jan. 1, 2024

This paper reports a study on the production of plasma jets that are out equilibrium through numerical solutions electron energy distribution function using self-consistent methodology. The approach includes integration continuity, momentum, and Poisson equations, which allows use mean to fit transport source coefficients. concurrently presents an analysis cold generation in tube. investigation utilizes COMSOL Multiphysics software simulate electric field, potential, density space. Moreover, examines how dielectric’s permittivity impacts propagation. simulated outcomes compared with experimental results. As density, ionization rate potential vary during propagation dielectric surface, materials increases, it promotes increase around it. This, turn, accelerates front, indicating efficient polarization accumulation charges, specifically electrons, near surface.

Language: Английский

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Numerical investigation on the discharge formation in micrometer pores in structured catalyst irradiated by a helium atmospheric pressure plasma jet

Plasma Sources Science and Technology, Journal Year: 2024, Volume and Issue: 33(2), P. 025004 - 025004

Published: Jan. 19, 2024

Abstract Non-thermal plasma catalysis is a promising way to achieve high efficiency in applications such as energy conversion and chemical engineering. Although synergistic effects between plasmas catalysts have been preliminarily considered an underlying mechanism of this type catalysis, the formation discharges small-size catalyst pores, which possibly crucial factor plasma-activated still not well understood. In paper, investigations on interactions helium atmospheric pressure jet (APPJ) with micrometer-sized pores different shapes sizes are conducted 2D fluid model. Simulation results show that existence makes subtle difference APPJ by changing equivalent capacitance, indicating potential moderate stable APPJ-catalyst interactions. Traces air impurities can promote thus allow form smaller pores. case when channel too small for direct penetration, we propose method producing prior discharge relatively large cavity supply seed electrons ignite inside channel. The discussed from perspectives behavior plasma-surface This work will contribute preparation structured potentially higher efficient better understanding physical processes micrometer

Language: Английский

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Distribution patterns of reactive species in the interaction between atmospheric pressure plasma jet and fiber membrane

Plasma Sources Science and Technology, Journal Year: 2023, Volume and Issue: 32(10), P. 105004 - 105004

Published: Sept. 26, 2023

Abstract Surface modification of polymer fiber membranes using atmospheric pressure low-temperature plasma has gained significant attention in recent years. The effectiveness surface determined by the uniform distribution reactive species when touching fibers. In this study, we investigated patterns on fibers with different spacings both experiment and modeling. results revealed that reduced spacing produced an obstructive effect propagation species. This obstruction was primarily caused accumulation a charge windward side fiber. Consequently, there substantial difference fluxes between leeward sides membrane, resulting poor uniformity distribution. It worth noting exhibited double-peak circumferential filaments. phenomenon attributed to coupling filaments, wherein electric field strength higher within gap. High facilitated generation However, as decreased, high became limited until it merged into

Language: Английский

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Spectral diagnosis of atmospheric pressure AC argon plasma jet at constant power

Acta Physica Sinica, Journal Year: 2023, Volume and Issue: 72(11), P. 115201 - 115201

Published: Jan. 1, 2023

In the application of atmospheric pressure plasma jet, because frequency AC power supply is limited in kHz range, research on influence electrical parameters discharge basically aimed at variation jet characteristics with a single driving parameter ( such as voltage and frequency). However, usually changes changing, which can undoubtedly affect performances including physical generated reactive species, resulting failure to reflect discharge. this study, an argon driven by home-made adjustable pulse modulated duty cycle. And combining diagnosis optical emission spectrum absorption spectrum, influences voltage, cycle gas temperature <i>T</i>_g, electron excitation <i>T</i>_exc, density <i>n</i>_e, OH radical particle number are studied under constant 2 W. The results show that power, n_e does not change linkage will offset density, while most affected cycle, followed effect smallest. Under decreases, increase, also increase. On contrary, although increases all reduced. addition, indicate reducing make produce more radicals lower temperature. This study provides new insight into jets presents guidance for choosing low high conducive development biomedicine other fields.

Language: Английский

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Streamer propagation characteristics of nanosecond pulsed discharge plasma on fluidized particles surface: experimental investigation and numerical simulation

Journal of Physics D Applied Physics, Journal Year: 2024, Volume and Issue: 57(25), P. 255203 - 255203

Published: March 14, 2024

Abstract Plasma fluidized-bed contributes to strengthening the interaction between active species in plasma and fluidized powder particles, resulting higher utilization efficiency superior powders processing/modification performance. However, streamer dynamics on particles are still unclear due intricacy of fluidized-bed. In this work, time-resolved evolution behavior streamers surfaces has been explored system based a simplified pin-cylinder configuration. The results reveal that entire propagation process includes volume discharge surface discharge. maximum electron density generated by is one order magnitude than produced discharge, indicating plays dominant role modification. presence particle will cause branching, main splits into two independent sub-streamers for ‘parabola-like’ shape. Compared with large-size (1000 µ m), wraps larger area micron-size (200 78% increase coverage area, which favorable modification particles. Furthermore, analyzed. (N, O, O 2 − ) mainly distributed around north pole, N + 25° 50° With decrease size, polarization effect significantly enhanced, maxima number densities increase. These findings help get better understanding systems.

Language: Английский

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Substrate temperature induced structure transformation in plasma film deposition process

Surface and Coatings Technology, Journal Year: 2022, Volume and Issue: 451, P. 129071 - 129071

Published: Nov. 16, 2022

Language: Английский

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The Molecular Basis for Selectivity of the Cytotoxic Response of Lung Adenocarcinoma Cells to Cold Atmospheric Plasma

Biomolecules, Journal Year: 2023, Volume and Issue: 13(11), P. 1672 - 1672

Published: Nov. 20, 2023

The interaction of cold atmospheric plasma (CAP) with biotargets is accompanied by chemical reactions on their surfaces and insides, it has great potential as an anticancer approach. This study discovers the molecular mechanisms that may explain selective death tumor cells under CAP exposure. To reach this goal, transcriptional response to treatment was analyzed in A549 lung adenocarcinoma lung-fibroblast Wi-38 cells. We found induced common trend from cells—the p53 pathway, KRAS signaling, UV response, TNF-alpha apoptosis-related processes were up-regulated both cell lines. However, amplitude more variable CAP-dependent DNA damage, cell-cycle arrest G2/M, dysfunctional glutathione peroxidase 4 (GPx4). activation genes endoplasmic reticulum stress ER lumens detected only Transmission-electron microscopy confirmed alteration morphology after It can be concluded responses nuclear constitute main differences sensitivity healthy

Language: Английский

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Research on the characteristics of atmospheric pressure AC argon discharge plasma jet: comprehensive effects of discharge voltage, gas flow rate, and external magnetic field

Acta Physica Sinica, Journal Year: 2024, Volume and Issue: 73(22), P. 225201 - 225201

Published: Jan. 1, 2024

Atmospheric pressure plasma jet has received widespread attention due to its enormous potential applications in various fields, and discharge conditions play a key role changing their physical chemical properties ultimately determining application effectiveness. Factors such as voltage, gas flow rate, the introduction of an external magnetic field intricately influence performance jet. The combined effects any two these factors can yield enhanced outcomes, while also bringing complexity phenomenon. However, there is currently lack research on field, rate characteristics jets, making it difficult comprehensively evaluate under multiple conditions. Therefore, this paper focuses AC excited atmospheric argon investigates characteristic parameters jet, including macroscopic morphology, power, temperature <i>T</i>_g, electron excitation <i>T</i>_exc, density <i>n</i>_e, emission intensity state Ar* particles, number ground ·OH particles by using methods camera shooting, electrical parameter measurement, spectroscopic analysis absorption spectra. obtained results are shown below. effect voltage not affected or existence field. increase improve enhancing extending plume length, elevating <i>T</i>_g increasing <i>n</i>_e well particles. addition without significantly extent improvement influenced mode action. Notably, enhancement most significant when selectively targets plume, excluding direct interaction with electrode region. becomes intricate: intertwined When present, excessive may reduce generated This underscores need for detailed understanding optimizing Simply combining optimal each individual factor does guarantee achievement peak all three work synergistically. study presents valuable insights into different conditions, providing guidance promoting advancement technology fields.

Language: Английский

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