Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Waskoenig, Jochen; Niemi, Kari; Knake, N.; Graham, L.M.; Reuter, Stephan; Gathen, Volker Schulz-von der; Gans, Timo

doi:10.1351/pac-con-09-11-05

Cited by 28 publications

(32 citation statements)

References 40 publications

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“…For the description of spatial distributions of the generated reactive species, 1D (onedimensional) or 2D models are used. In [102,112,120] the simulation of RF discharges between the parallel-plate electrodes in a transverse gas flow is performed using a 1D model (assuming that the variation of the discharge parameters along the flow is negligible). The balance equations for the reactive species j are: ,…”

Section: Brief Historical Perspectivementioning

confidence: 99%

“…While two-photon laser induced spectroscopy yields reliable density results of atomic oxygen (see above), this technique is complex and requires access for the laser beam and the observation optics. The DBM combines one-dimensional numerical simulation based on fluid equations with kinetic treatment of the electrons [120,209,210].…”

Section: Combination Of Optical Emission Spectroscopy and Modellingmentioning

confidence: 99%

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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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Section: Brief Historical Perspectivementioning

confidence: 99%

Section: Combination Of Optical Emission Spectroscopy and Modellingmentioning

confidence: 99%

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

et al. 2016

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“…The jet is operated in helium at various flow rates from 200 sccm to 5 slm. The electric field between the electrodes causes a breakdown in the gas and produces a plasma with electron temperatures and densities of about 1 to 2 eV and 10 10 cm −3 , respectively [7,8]. Atoms and molecules in the feed gas become excited, dissociated or ionized by electron impacts.…”

Section: The Atmospheric Pressure Micro-plasma Jetmentioning

confidence: 99%

Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air

Niermann¹,

Kanitz²,

Böke³

et al. 2011

J. Phys. D: Appl. Phys.

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Abstract. Space and time resolved concentrations of helium He ( 3 S 1 ) metastable atoms in an atmospheric pressure radio-frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. Spatial profiles as well as lifetime measurements show significant influences of air entering the discharge from the front nozzle and of impurities originating from the gas supply system. Quenching of metastables was used to deduce quantitative concentrations of intruding impurities. The impurity profile along the jet axis was determined from optical emission spectroscopy as well as their dependance on the feed gas flow through the jet.

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“…When operated into the ambient air, the reactive plasma effluent activates the neutral oxygen and nitrogen species generating a rich mixture of RONS [8][9][10][11][12]; these are subsequently delivered to the biological target by the plasma and gas flow. Atmospheric-pressure, molecular beam mass spectrometric studies have revealed secondary reactive species including tens of positively charged species and hundreds of negatively charged species and neutrals are generated by the interaction between the APPJ and / or APPJ effluent (primary species e.g.…”

Section: Introductionmentioning

confidence: 99%

In-situ UV Absorption Spectroscopy for Monitoring Transport of Plasma Reactive Species through Agarose as Surrogate for Tissue

Szili

Gaur

et al. 2015

J. Photopol. Sci. Technol.

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We demonstrated the efficacy of using a simple experimental approach, involving UV absorption spectroscopy, to monitor the transport of reactive oxygen and nitrogen species (RONS) through an agarose film (as surrogate for real tissue) into deionized (DI) water. The experiment involved placing a 4 mm thick agarose film over a quartz cuvette filled with DI water. The agarose film was exposed to a non-thermal, He atmospheric-pressure plasma jet (APPJ) and the UV absorption of the DI water was recorded in real-time. Our results indicate an accumulation of RONS within the agarose film during APPJ exposure and a subsequent time-lapsed release of RONS into the DI water. Curve fitting of the UV spectra suggested the APPJ transported and / or generated at least four RONS (NaNO 2 , HNO 3 , H 2 O 2 and O 2 ) through the 4 mm thick agarose film. Our approach of analyzing the delivery depth of RONS through synthetic tissue targets might find use in the future development of APPJ medical therapies and for improving our understanding of APPJ interactions with soft tissue.

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Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Cited by 28 publications

References 40 publications

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

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

Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air

In-situ UV Absorption Spectroscopy for Monitoring Transport of Plasma Reactive Species through Agarose as Surrogate for Tissue

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