Surface DBD degradation in humid air, and a hybrid surface-volume DBD for robust plasma operation at high humidity

Avino, Fabio; Howling, A.A.; Allmen, M. Von; Waskow, Alexandra; Ibba, Lorenzo; Han, Jun; Furno, I.

doi:10.1088/1361-6463/acd2e4

Cited by 4 publications

(1 citation statement)

References 58 publications

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“…The gas flow is controlled to have steady state conditions and avoid an increase in RH due to the water released by the agar plate. High levels of RH can lead to deterioration and/or damage of the SDBD [35]. This would prevent plasma ignition homogenously over the whole surface, leading to erroneous or misleading results.…”

Section: E Coli Culture Management and Plasma Treatment Protocolmentioning

confidence: 99%

In-Situ FTIR and Laser Induced Fluorescence RONS Characterization of Atmospheric Pressure Nanosecond-Pulsed Surface DBD Plasma for Indirect Treatments of E. Coli

Ibba,

Agus,

Avino

et al. 2024

Plasma Chem Plasma Process

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We study the bactericidal efficacy of surface dielectric barrier discharge low-temperature plasma treatments, powered by nanosecond high voltage pulses. We achieve $$\sim $$ ∼ 4-log reduction in Escherichia coli population, after 10 min treatments, at a distance of 1.5 cm from the plasma surface. To investigate the reactive oxygen and nitrogen species (RONS) responsible for the bactericidal effect, we employ in-situ fourier transform infrared (FTIR) spectroscopy to measure a selection of relevant species, such as O$$_3$$ 3 , NO$$_2$$ 2 , N$$_2$$ 2 O and N$$_2$$ 2 O$$_5$$ 5 . The measurements are taken under various relative humidity conditions to replicate the bacteria treatment environment. While RONS originating from nitrogen chemistry are detected, nitric oxide (NO), a pivotal molecule in nitrate production, is absent due to the sensitivity limitations of FTIR detection. To overcome this limitation, we employ laser induced fluorescence utilizing a picosecond-pulsed laser to measure the kinetics of NO produced by the plasma. Our results show that the NO concentration is smaller than 1 ppm and primarily localized near the plasma surface, with concentrations increasing proportionally with relative humidity. Notably, at a distance of 1.5 cm from the plasma surface, at which the E. coli is treated, the concentration of NO falls below 50 ppb. Although NO is pivotal in generating secondary reactive species within the plasma, our results suggest that it does not directly contribute to the bacteria inactivation process. Instead, other molecules, such as O$$_3$$ 3 , NO$$_2$$ 2 , and N$$_2$$ 2 O, which are found in higher concentrations, may be responsible for the bactericidal properties observed in indirect plasma treatments.

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Section: E Coli Culture Management and Plasma Treatment Protocolmentioning

confidence: 99%

In-Situ FTIR and Laser Induced Fluorescence RONS Characterization of Atmospheric Pressure Nanosecond-Pulsed Surface DBD Plasma for Indirect Treatments of E. Coli

Ibba,

Agus,

Avino

et al. 2024

Plasma Chem Plasma Process

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Implementing water recirculation in a novel portable plasma-activated water reactor enhances antimicrobial effect against Escherichia coli

Agus,

Avino,

Ibba

et al. 2024

Chemical Engineering Journal

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The time evolution of electrical and thermodynamic characteristics of surface dielectric barrier discharge caused by dielectric degradation

Wang,

Tian,

Peng

et al. 2024

J. Phys. D: Appl. Phys.

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The degradation of the dielectric layer is a common issue in dielectric barrier discharge (DBD). The performance of DBD devices may suffer from instability due to potential corrosion of the dielectric layer caused by discharge, which could even result in structural failure. To gain a comprehensive understanding of the degradation of DBD devices during discharge, the evolution of the performance of DBD devices with various dielectric materials over time is studied. Periodic patterns are found to form on the dielectric surface along the edge of the high-voltage electrode. The electrical data, emission spectra, and surface morphologies of DBD devices with three different dielectric materials, namely ceramics, glass, and PCB, are obtained during an eight-hour discharge. The electrical and thermodynamic characteristics of DBD devices with the three dielectric materials are found to initially decrease by about 20~40%. Subsequently, they remain stable in devices with ceramics and PCB dielectric layers but increase in devices with glass dielectric layers until the end. Surface morphologies reveal that periodic patterns consisting of metal accumulations, etching pits, and metal depositions form on the surfaces of ceramics, glass, and PCBs, respectively. Some organic compounds vaporize from the surface of PCBs. The deposition, etching, and vaporization could be reasons for changes in the electrical and thermodynamic characteristics. It shows that degradation occurs not only in organic dielectrics like polymers but also in inorganic dielectrics such as ceramics and glass. To enhance stability and prevent potential failures and overestimations, electrical and optical measurements could be utilized as diagnostic methods in applications involving DBD devices.

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Surface DBD degradation in humid air, and a hybrid surface-volume DBD for robust plasma operation at high humidity

Cited by 4 publications

References 58 publications

In-Situ FTIR and Laser Induced Fluorescence RONS Characterization of Atmospheric Pressure Nanosecond-Pulsed Surface DBD Plasma for Indirect Treatments of E. Coli

In-Situ FTIR and Laser Induced Fluorescence RONS Characterization of Atmospheric Pressure Nanosecond-Pulsed Surface DBD Plasma for Indirect Treatments of E. Coli

Implementing water recirculation in a novel portable plasma-activated water reactor enhances antimicrobial effect against Escherichia coli

The time evolution of electrical and thermodynamic characteristics of surface dielectric barrier discharge caused by dielectric degradation

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