Journal ArticleDOI
Evolution of discharge structure in capacitive radio-frequency atmospheric microplasmas.
Jianjun Shi,Michael G. Kong +1 more
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TLDR
It is shown that the narrow electrode gap deforms the discharge structure, ultimately removing the bulk-plasma region and disabling electron trapping, allowing rf atmospheric microplasmas to operate at very high current densities thus simultaneously achieving higher stability and greater chemical reactivity.Abstract:
Conventional radio-frequency (rf) nonthermal atmospheric plasmas are generated in a millimeter gap. In this Letter, we present a self-consistent numerical study of rf atmospheric microplasmas in a submillimeter gap comparable to their sheath thickness. It is shown that the narrow electrode gap deforms the discharge structure, ultimately removing the bulk-plasma region and disabling electron trapping. Significantly, these properties permit rf atmospheric microplasmas to operate at very high current densities thus simultaneously achieving higher stability and greater chemical reactivity.read more
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Microplasmas for nanomaterials synthesis
TL;DR: Microplasmas have attracted a tremendous amount of interest from the plasma community because of their small physical size, stable operation at atmospheric pressure, non-thermal characteristics, high electron densities and non-Maxwellian electron energy distributions as discussed by the authors.
Journal ArticleDOI
Microplasmas: sources, particle kinetics, and biomedical applications
Felipe Iza,Felipe Iza,Gon Jun Kim,Seung Min Lee,Jae Koo Lee,James L. Walsh,Yuantao T. Zhang,Michael G. Kong +7 more
TL;DR: In this article, a review of existing microplasma sources and charged particle kinetics in various microdischarges is presented, and an outlook is presented on the biomedical application of microplasmas.
Journal ArticleDOI
Physical Mechanisms of Inactivation of Bacillus subtilis Spores Using Cold Atmospheric Plasmas
TL;DR: In this paper, a detailed study of the potential physical mechanisms of microbial inactivation by cold atmospheric plasmas is presented, with the Bacillus subtilis spores as a model microorganism and an atmospheric-plasma plume in helium flow, optical emission spectroscopy and inactivation kinetics are used to demonstrate the dominating role played by reactive oxygen species (e.g., atomic oxygen and OH) as well as the minor contributions of the UV photons, heat, charged particles, and electric fields.
Journal ArticleDOI
Ionization by drift and ambipolar electric fields in electronegative capacitive radio frequency plasmas.
TL;DR: Unlike α- and γ-mode operation, electrons accelerated by strong drift and ambipolar electric fields in the plasma bulk and at the sheath edges are found to dominate the ionization in strongly electronegative discharges.
Journal ArticleDOI
A Model of Plasma-Biofilm and Plasma-Tissue Interactions at Ambient Pressure
Chen Chen,Dingxin Liu,Zhichao Liu,Aijun Yang,Hailan Chen,Gilbert Shama,Michael G. Kong,Michael G. Kong +7 more
TL;DR: In this paper, the authors present a model framework for plasma-biofilm and plasma-tissue interactions that can link molecular simulation of plasma chemistry to functions at a cell population level or a tissue level.
References
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Journal ArticleDOI
Plasma needle: a non-destructive atmospheric plasma source for fine surface treatment of (bio)materials
TL;DR: In this paper, a non-thermal plasma source (plasma needle) generated under atmospheric pressure by means of radiofrequency excitation has been characterized, which can be applied on organic materials, also in watery environment, without causing thermal/electric damage to the surface.
Journal ArticleDOI
Transition between different regimes of rf glow discharges
Ph. Belenguer,Jean-Pierre Boeuf +1 more
TL;DR: A self-consistent fluid model of radio-frequency glow discharges has been used to analyze the existence of two different discharge regimes and of the transition between them, and a realistic description of the electron kinetics has been obtained by considering separately two electron groups representing, respectively, the tail and the bulk of the electrons distribution function.
Journal ArticleDOI
An atmospheric pressure plasma source
Jaeyoung Park,I. Henins,Hans W. Herrmann,G. S. Selwyn,Jae-Yeon Jeong,Robert F. Hicks,D. Shim,Chang-Hwan Chang +7 more
TL;DR: In this paper, an atmospheric pressure plasma source operated by radio frequency power has been developed, which produces a unique discharge that is volumetric and homogeneous at atmospheric pressure with a gas temperature below 300 °C.
Journal ArticleDOI
Mechanisms of the α and γ modes in radio-frequency atmospheric glow discharges
J.J. Shi,Michael G. Kong +1 more
TL;DR: In this article, a radio-frequency (RF) atmospheric glow discharge was observed at high current density of up to 1A∕cm2, suggesting a previously overlooked and potentially different operation regime.
Journal ArticleDOI
Evolution of the electron-energy-distribution function during rf discharge transition to the high-voltage mode
TL;DR: The electron-energy-distribution function (EEDF) in low-pressure argon and helium rf discharges has been measured during the discharge transition from the low- voltage to the high-voltage mode using a recently developed high-resolution Langmuir probe technique.