From Submicrosecond- to Nanosecond-Pulsed Atmospheric-Pressure Plasmas

Iza, Felipe; Walsh, James L.; Kong, Michael G.

doi:10.1109/tps.2009.2014766

Cited by 78 publications

(49 citation statements)

References 24 publications

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“…Although the bulges of the biofilms (sites 1, 3, 5, K, 23) have a larger angle of view compared with the cavities between them, the micrometers' mean free path causes the ions to penetrate into the cavities. Figure 6(a) suggests the time fluence of positive ions at the bottom of the cavity (such as sites 12,14) is larger than that at the bulge of the biofilm (such as sites 11,13), which is consistent with the peak electron density inside the cavity shown in figure 4(d).…”

Section: The Negative Filaments Over the Bacterial Biofilmssupporting

confidence: 71%

Interactions between multiple filaments and bacterial biofilms on the surface of an apple

Pan

et al. 2018

Plasma Sci. Technol.

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In this paper, the interactions between two dielectric barrier discharge (DBD) filaments and three bacterial biofilms are simulated. The modeling of a DBD streamer is studied by means of 2D finite element calculation. The model is described by the proper governing equations of air DBD at atmospheric pressure and room temperature. The electric field in the computing domain and the self-consistent transportation of reactive species between a cathode and biofilms on the surface of an apple are realized by solving a Poisson equation and continuity equations. The electron temperature is solved by the electron energy conservation equation. The conductivity and permittivity of bacterial biofilms are considered, and the shapes of the bacterial biofilms are irregular in the uncertainty and randomness of colony growth. The distribution of the electrons suggests that two plasma channels divide into three plasma channels when the streamer are 1 mm from the biofilms. The toe-shapes of the biofilms and the simultaneous effect of two streamer heads result in a high electric field around the biofilms, therefore the stronger ionization facilitates the major part of two streamers combined into one streamer and three streamers arise. The distribution of the reactive oxygen species and the reactive nitrogen species captured by time fluences are non-uniform due to the toe-shaped bacterial biofilms. However, the plasma can intrude into the cavities in the adjacent biofilms due to the μm-scale mean free path. The two streamers case has a larger treatment area and realizes the simultaneous treatment of three biofilms compared with one streamer case.

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Section: The Negative Filaments Over the Bacterial Biofilmssupporting

confidence: 71%

Interactions between multiple filaments and bacterial biofilms on the surface of an apple

Pan

et al. 2018

Plasma Sci. Technol.

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“…21,22 Iza et al reported on basic experiments and theoretical calculations with regard to the voltage rise time of atmospheric discharges produced using a parallel electrode pair setup. 21 They clarified the characteristics of the atmospheric pulse discharge: The shorter pulse discharges, which are ignited by higher voltages with fast voltage rise times, have higher average electron energies, because the electron energy only reaches large values during a short section of the initial period of the pulse discharge. Walsh et al carried out atmospheric plasma jet experiments using pulsed and sinusoidal voltage waveforms and reported more efficient O atom production in pulsed plasma jets.…”

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confidence: 99%

Effects of discharge voltage waveform on the discharge characteristics in a helium atmospheric plasma jet

Takenaka

Setsuhara

2015

Journal of Applied Physics

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We present here an analysis of the discharge characteristics of a He plasma jet operating under three different types of applied voltage waveform: (a) a μs-pulse voltage waveform with a slow voltage rise time, (b) ns-pulse, and (c) rectangular voltage waveforms with fast voltage rise time. Optical emission measurements show that the application of a voltage with a fast voltage rise time induces rapid discharge growth and, consequently, produces an abundance of energetic electrons, which in turn leads to high optical emission from the O atoms. We also estimate the optical emission efficiency of the O atom (ηo), which corresponds roughly to the production efficiency of the reactive O species. ηo increases with increasing applied voltage, and the highest value of ηo is obtained in the shortest pulse discharge, which was ignited by a ns-pulse voltage waveform with a fast voltage rise time and short pulse width.

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“…Current densities up to 15 A/cm 2 are reported by Iza et al (2009) using pulsed discharges to sustain atmospheric pressure plasmas in air. This is several times higher than is typical in alkaline or PEM electrolysis as described in e.g.…”

Section: Plasma Electrolysis Literaturementioning

confidence: 99%

Review of pulsed power for efficient hydrogen production

Monk

Watson

2016

International Journal of Hydrogen Energy

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Pulsed power applied to electrolysis offers a potential method for efficient hydrogen production which has not been comprehensively studied to date. Pulsed and plasma electrolysis are introduced and previous research assessed. Electrolysis use in potential space or aerospace applications is substantially weight and volume sensitive. Pulsed plasma electrolysis is able to far exceed the Faradaic limit on electrolysis at very high surface current densities presenting the opportunity to reduce electrode mass and volume. Pulse generation technology is introduced and challenges inherent in application to electrolysis outlined.

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From Submicrosecond- to Nanosecond-Pulsed Atmospheric-Pressure Plasmas

Cited by 78 publications

References 24 publications

Interactions between multiple filaments and bacterial biofilms on the surface of an apple

Interactions between multiple filaments and bacterial biofilms on the surface of an apple

Effects of discharge voltage waveform on the discharge characteristics in a helium atmospheric plasma jet

Review of pulsed power for efficient hydrogen production

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