Low-Temperature Soot Incineration of Diesel Particulate Filter Using Remote Nonthermal Plasma Induced by a Pulsed Barrier Discharge

Okubo, Masaaki; Kuroki, Tetsuo; Miyairi, Y.; Yamamoto, Toshiaki

doi:10.1109/tia.2004.836129

Cited by 59 publications

(30 citation statements)

References 18 publications

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“…However, different patterns of cellular damage between Gram-negative and Gram-positive bacteria were observed in previous studies (18,19). Moreover, the treatment parameter of mode of exposure has been previously described (13,20); the inactivation mechanisms reported were similar under both direct and indirect exposure to the plasma. With regard to inactivation efficacy, indirect exposure to ACP had a reduced microbicidal effect in cases where there was no interaction with UV, electron beams, charged particles, and other short-lived species.…”

mentioning

confidence: 82%

Mechanisms of Inactivation by High-Voltage Atmospheric Cold Plasma Differ for Escherichia coli and Staphylococcus aureus

Han¹,

Patil²,

Boehm³

et al. 2016

Appl Environ Microbiol

329

200

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bAtmospheric cold plasma (ACP) is a promising nonthermal technology effective against a wide range of pathogenic microorganisms. Reactive oxygen species (ROS) play a crucial inactivation role when air or other oxygen-containing gases are used. With strong oxidative stress, cells can be damaged by lipid peroxidation, enzyme inactivation, and DNA cleavage. Identification of ROS and an understanding of their role are important for advancing ACP applications for a range of complex microbiological issues. In this study, the inactivation efficacy of in-package high-voltage (80 kV [root mean square]) ACP (HVACP) and the role of intracellular ROS were investigated. Two mechanisms of inactivation were observed in which reactive species were found to either react primarily with the cell envelope or damage intracellular components. Escherichia coli was inactivated mainly by cell leakage and low-level DNA damage. Conversely, Staphylococcus aureus was mainly inactivated by intracellular damage, with significantly higher levels of intracellular ROS observed and little envelope damage. However, for both bacteria studied, increasing treatment time had a positive effect on the intracellular ROS levels generated.A tmospheric cold plasma (ACP) refers to nonequilibrated plasma generated at near-ambient temperatures and pressure. ACP is composed of particles, including free electrons, radicals, and positive and negative ions, but it is low in collision frequency of gas discharge compared to that with equilibrated plasma (1, 2). ACP technologies have widely been applied for many surface treatments and environmental processes. Recently, they have been studied for food sterilization and plasma medicine (2-5).ACP provides inactivation effects against a wide range of microbes, mainly by the generation of cell-lethal reactive species (6-8). By discharging in air, groups of reactive species are generated, such as reactive oxygen species (ROS), reactive nitrogen species (RNS), UV radiation, energetic ions, and charged particles (5). However, the inactivation efficacy can be varied by changing the working gases, which results in different types or amounts of reactive species generated (9-11). ROS are often identified as the principal effecting species, with a relatively long half-life and strong antimicrobial effects, which are generated in oxygen-containing gases (12).ROS generated during plasma discharge in air or oxygen-containing mixtures are assemblies of ozone, hydrogen peroxide, and singlet and atomic oxygen, while ozone is considered the most microbicidal species (13). With strong oxidative stress, cells are damaged by lipid peroxidation, enzyme inactivation, and DNA cleavage. The generation of plasma in air or a nitrogen-containing gas mixture can also generate NO x species. However, higher inactivation efficacy has been reported with the combined application of NO and H 2 O 2 on Escherichia coli than that with a treatment with NO or H 2 O 2 alone (14). Reactive nitrogen species are highly toxic and can lead to cell death by increas...

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mentioning

confidence: 82%

Mechanisms of Inactivation by High-Voltage Atmospheric Cold Plasma Differ for Escherichia coli and Staphylococcus aureus

Han¹,

Patil²,

Boehm³

et al. 2016

Appl Environ Microbiol

329

200

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“…Catalyst enabled [e.g. 7] (including low temperature plasma systems [8] ) 3. Non-oxidative methods (e.g.…”

Section: Introductionmentioning

confidence: 99%

Low Power Autoselective Regeneration of Monolithic Wall Flow Diesel Particulate Filters

Williams

Garner

Harry

et al. 2009

SAE Technical Paper Series

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“…Figure 4 shows the waveforms of discharge voltage, current and power under the air of 4 Sl/min with 16 kVpp and 100 Hz. Here, the instantaneous power is derived simply from the product of (21) . Figure 5 shows photographs of the discharge region under the condition of the air of 4 Sl/min with 20 kVpp, (a) 200 Hz and (b) 1 kHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Methanol Decomposition Process by a Nonthermal Plasma Flow

Sato

Kambe

Nishiyama

2005

JSME Int. J., Ser. B

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In the present study, experimental and numerical analyses were adopted to clarify key reactive species for methanol decomposition processes using a nonthermal plasma flow. The nonthermal plasma flow was generated by a dielectric barrier discharge (DBD) as a radical production source. The experimental methods were as follows. Working gas was air of 1 -10 Sl/min. The peak-to-peak applied voltage was 16 -20 kV with sine wave of 1 Hz -7 kHz. The characteristics of gas velocity, gas temperature, ozone concentration and methanol decomposition efficiency were measured. Those characteristics were also numerically analyzed using conservation equations of mass, chemical component,

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Low-Temperature Soot Incineration of Diesel Particulate Filter Using Remote Nonthermal Plasma Induced by a Pulsed Barrier Discharge

Cited by 59 publications

References 18 publications

Mechanisms of Inactivation by High-Voltage Atmospheric Cold Plasma Differ for Escherichia coli and Staphylococcus aureus

Mechanisms of Inactivation by High-Voltage Atmospheric Cold Plasma Differ for Escherichia coli and Staphylococcus aureus

Low Power Autoselective Regeneration of Monolithic Wall Flow Diesel Particulate Filters

Analysis of a Methanol Decomposition Process by a Nonthermal Plasma Flow

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