Diagnostics on an atmospheric pressure plasma jet

Niemi, Kari; Reuter, Stephan; Schaper, L.; Knake, N.; Gathen, Volker Schulz-von der; Gans, Timo

doi:10.1088/1742-6596/71/1/012012

Cited by 25 publications

(30 citation statements)

References 22 publications

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“…f) Capacitively coupled RF (13.56MHz) plasma sustained in helium at atmospheric pressure. Reprinted from [79], with permission of IOP Publishing. g) 3-electrode DC plasma in argon at 160 Torr in which a microhollow cathode (left electrodes) serves as a virtual cathode for a DC discharge sustained between the virtual cathode and an anode (right electrode).…”

Section: Discussionmentioning

confidence: 99%

Foundations of atmospheric pressure non-equilibrium plasmas

Bruggeman

Iza

Brandenburg

2017

Plasma Sources Sci. Technol.

291

242

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Non-equilibrium plasmas have been intensively studied over the past century in the context of material processing, environmental remediation, ozone generation, excimer lamps and plasma display panels. Research on high-pressure nonequilibrium plasmas intensified over the last two decades leading to a large variety of atmospheric-pressure plasma sources that have been developed for an extended application range including chemical conversion, medicine, chemical analysis and disinfection. The fundamental understanding of these discharges is emerging but there remain a lot of unexplained phenomena in these intrinsically complex plasmas. The properties of non-equilibrium plasmas at atmospheric pressure span over a huge range of electron densities as well as heavy particle and electron temperatures. This paper provides an overview of the key underlying processes that are important for the generation and stabilization of high-pressure non-equilibrium plasmas. The unique physical and chemical properties of theses discharges are also summarized.

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Section: Discussionmentioning

confidence: 99%

Foundations of atmospheric pressure non-equilibrium plasmas

Bruggeman

Iza

Brandenburg

2017

Plasma Sources Sci. Technol.

291

242

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“…The last two decades have seen major advances in the development and experimental studies of N-APPJs [33,58,[134][135][136][137][138][139][140]. One of the important properties of N-APPJs is their…”

Section: Basic Experimental Observations and Diagnosticsmentioning

confidence: 99%

“…LIF on supersonic plasma jets at reduced pressure has been used for NO measurements [171]. Several biologically relevant molecules such as CH [137], CN [138], NO [33,139,140], and OH have also been investigated by LIF.…”

mentioning

confidence: 99%

Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport, and biological effects

et al. 2016

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Non-equilibrium atmospheric-pressure plasmas have recently become a topical area of research owing to their diverse applications in health care and medicine, environmental remediation and pollution control, materials processing, electrochemistry, nanotechnology and other fields. This review focuses on the reactive electrons and ionic, atomic, molecular, and radical species that are produced in these plasmas and then transported from the point of generation to the point of interaction with the material, medium, living cells or tissues being processed. The most important mechanisms of generation and transport of the key species in the plasmas of atmospheric-pressure plasma jets and other non-equilibrium atmosphericpressure plasmas are introduced and examined from the viewpoint of their applications in plasma hygiene and medicine and other relevant fields. Sophisticated high-precision, timeresolved plasma diagnostics approaches and techniques are presented and their applications to monitor the reactive species and plasma dynamics in the plasma jets and other discharges, both in the gas phase and during the plasma interaction with liquid media, are critically reviewed. The large amount of experimental data is supported by the theoretical models of reactive species generation and transport in the plasmas, surrounding gaseous environments, and plasma interaction with liquid media. These models are presented and their limitations are discussed. Special attention is paid to biological effects of the plasma-generated reactive oxygen and nitrogen (and some other) species in basic biological processes such as cell metabolism, proliferation, survival, etc. as well as plasma applications in bacterial inactivation, wound healing, cancer treatment and some others. Challenges and opportunities for theoretical and experimental research are discussed and the authors' vision for the emerging convergence trends across several disciplines and application domains are presented to stimulate critical discussions and collaborations in the future. 4 3.5 Optical absorption spectroscopy 3.5.1 Ozone 3.5.2 UV broadband absorption of OH density 3.5.3 Cavity ring-down spectroscopy 3.5 Selected non-optical techniques 3.5.1 Mass spectrometry 3.5.2 Flow visualization 3.5.3 Electron paramagnetic resonance spectroscopy 4. Temporal and spatial behaviour of key reactive species 4.1 Electron density (n e) 4.2 O atoms 4.2.1 Effect of admixture of O 2 /air on O concentration 4.2.2 Diffusion effect of shielding gas on O production 4.3 OH radical 4.3.1 Effect of H 2 O admixture on OH concentration 4.3.2 Effect of gas flow on OH concentration 4.3.3 Effect of O 2 on OH production 4.3.4 Effect of the treated samples on OH concentration 4.3.4.1 Effect of humidity of treatment sample on OH distribution 4.3.4.2 Effect of sample conductivity on OH distribution 4.3.4.3. Effect of the amplitude of the applied voltage on OH distribution 4.3.4.4. The effect of gas flow on OH distribution 4.3.4.5. The effect of the surface characteristics on OH distribution 4.3.5 Effe...

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“…Although laser‐aided techniques have been used successfully in the study of low‐pressure large‐scale systems, collisional quenching and scattered radiation from surfaces make laser‐aided diagnostics quite challenging for the study of high‐pressure microplasmas. Nonetheless, Thomson scattering has been used to determine the electron density,156 laser absorption to determine metastable concentrations,152 laser‐induced fluorescence (LIF) to determine surface charges in a DBD discharge,157 and two‐photon LIF spectroscopy to measure absolute concentrations of radicals 158…”

Section: Diagnostics and Simulations Of Microplasmasmentioning

confidence: 99%

Microplasmas: Sources, Particle Kinetics, and Biomedical Applications

Iza

Kim

Lee

et al. 2008

Plasma Processes & Polymers

478

339

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Thanks to their portability and the non‐equilibrium character of the discharges, microplasmas are finding application in many scientific disciplines. Although microplasma research has traditionally been application driven, microplasmas represent a new realm in plasma physics that still is not fully understood. This paper reviews existing microplasma sources and discusses charged particle kinetics in various microdischarges. The non‐equilibrium character highlighted in this manuscript raises concerns about the accuracy of fluid models and should trigger further kinetic studies of high‐pressure microdischarges. Finally, an outlook is presented on the biomedical application of microplasmas.

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Diagnostics on an atmospheric pressure plasma jet

Cited by 25 publications

References 22 publications

Foundations of atmospheric pressure non-equilibrium plasmas

Foundations of atmospheric pressure non-equilibrium plasmas

Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport, and biological effects

Microplasmas: Sources, Particle Kinetics, and Biomedical Applications

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