Processes in Atmospheric Pressure Plasmas

A special issue of Plasma (ISSN 2571-6182).

Deadline for manuscript submissions: 31 May 2025 | Viewed by 1070

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Interests: coating; thin film deposition; thin films; plasma physics; oxidation; materials engineering; alloys; microstructure; materials; materials science
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Dear Colleagues,

Different types of atmospheric-pressure plasma are applied not only in classical fields, such as material research, diagnostics, or industrial production, but also in novel approaches in food and seed science and medicine, including wound healing, dentistry, sterilization, and odour control, among many others. The most frequently used methods for atmospheric-pressure plasma generation include the following:

  • Different atmospheric-pressure plasma jets based on kHz DBD, radio frequency, microwaves, and pulsed arcs, operated with different gases;
  • Dielectric-barrier discharges, including surface-barrier discharges, coplanar-surface-barrier discharges, and atmospheric-pressure glow operated with noble gases or their mixtures with oxygen or hydrogen;
  • Piezoelectric direct discharge used both in ambient air and in wall-specified gas mixtures of nitrogen, oxygen, synthetic air, or compressed dried air;
  • Corona discharges, especially positive pulsed corona.

An area of focus in recent research has been the interaction of plasma with liquids or humid environments, including the production of plasma-activated water (PAW) or plasma-activated liquids in general. Despite progress in this area, the mechanisms of interaction of different types of plasma with humidity, liquids, and materials are not fully understood in all cases. Many physical and chemical processes crucial for successful implementation require better explanations, modelling, predictions, and clarifications. This Special Issue of Plasma presents an opportunity for both scholars and researchers from various national and international institutions to present their progress in these fields. You are welcome to submit your original papers for peer review.

Prof. Dr. Maik Froehlich
Guest Editor

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Keywords

  • atmospheric-pressure plasma
  • cold atmospheric plasma
  • atmospheric-pressure plasma jet (APPJ)
  • dielectric barrier discharge (DBD)
  • pulsed corona
  • ozone
  • nitrogen oxides
  • peroxide
  • humidity
  • plasma-activated water (PAW)

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Published Papers (2 papers)

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Research

19 pages, 6382 KiB  
Article
Quantifying Plasma Dose for Barley Seed Treatment by Volume Dielectric Barrier Discharges in Atmospheric-Pressure Synthetic Air
by Jiří Fujera, Petr Hoffer, Václav Prukner and Milan Šimek
Plasma 2025, 8(1), 11; https://doi.org/10.3390/plasma8010011 - 17 Mar 2025
Viewed by 186
Abstract
Plasma-assisted treatment is a potentially interesting technology for advanced seed processing. In this work, we address the issue of defining and quantifying the plasma dose during the exposure of seeds to microdischarges formed in a barrier discharge configuration fed with synthetic air at [...] Read more.
Plasma-assisted treatment is a potentially interesting technology for advanced seed processing. In this work, we address the issue of defining and quantifying the plasma dose during the exposure of seeds to microdischarges formed in a barrier discharge configuration fed with synthetic air at atmospheric pressure. Using advanced imaging and other optoelectrical diagnostics, we identify suitable conditions for the formation of microdischarges developing exclusively between the powered electrode and the seed coat, which allows for the relatively accurate quantification of the plasma dose for an individual barley seed. In addition to determining the microdischarge energy/power consumed to treat a single seed during controlled exposure, we also provide an estimate of the electric field and gas temperature, which are key parameters that can affect seed viability. In this way, each individually exposed seed can be linked to the exact exposure time, total number, energy, and temperature of the microdischarges that came into contact with it. This is fundamentally different from conventional “averaging” approaches based on the simultaneous exposure of many seeds, which makes it virtually impossible to correlate the responses of individual seeds with the corresponding individual plasma dose. Finally, we propose a minimal treatment protocol that could allow for the more direct interpretation of the results of subsequent biological tests to reveal seed responses to specific plasma–chemical stimuli during germination and seedling growth. Full article
(This article belongs to the Special Issue Processes in Atmospheric Pressure Plasmas)
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11 pages, 1336 KiB  
Article
Network Analysis as a Method for Identifying Operational Modes of Cold Atmospheric Plasma Jets
by Blake Haist and Richard E. Wirz
Plasma 2025, 8(1), 10; https://doi.org/10.3390/plasma8010010 - 10 Mar 2025
Viewed by 470
Abstract
Network analysis is a convenient method for analyzing cold atmospheric plasma (CAP) devices across a wide range of operating conditions. By using frequency and voltage as nodes in the network, edges are formed between nodes when the combination of voltage and frequency results [...] Read more.
Network analysis is a convenient method for analyzing cold atmospheric plasma (CAP) devices across a wide range of operating conditions. By using frequency and voltage as nodes in the network, edges are formed between nodes when the combination of voltage and frequency results in an ignited plasma jet. Singular value decomposition is used to identify modalities in the network that are representative of operational modes in the plasma jet. An analysis of the spectra produced by the jet provides validation of the operational modes and shows that voltage and frequency predominately affect the operation of the jet with remarkable independence. Full article
(This article belongs to the Special Issue Processes in Atmospheric Pressure Plasmas)
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