Article
Physics, Fluids & Plasmas
Yaogong Wang, Xiaoqin Ma, Dennis Bouwman, Zhuoran Liu, Ute Ebert, Xiaoning Zhang
Summary: In this study, we analyzed the plasma wave propagation mechanism of microcavity discharge in pure argon at two different pressures. Experimental and modeling results revealed the existence of two distinct pressure-dependent propagation modes and showed that the discharge duration time was significantly influenced by the pressure.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Evgenia Benova, Plamena Marinova, Radka Tafradjiiska-Hadjiolova, Zafer Sabit, Dimitar Bakalov, Nikolay Valchev, Lubomir Traikov, Todor Hikov, Ivan Tsonev, Todor Bogdanov
Summary: A cold microwave plasma torch can be used in medicine and agriculture to treat biological systems without thermal damage or unwanted effects. It has high bactericidal, virucidal, and fungicidal effects without the use of harmful chemicals. This paper presents a detailed investigation of the plasma characteristics and their optimization for biomedical applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Physics, Applied
Yusuke Nakagawa, Tatsuki Yoshii, Fumiyoshi Tochikubo
Summary: In this study, ground state atomic nitrogen was analyzed using two-photon absorption laser-induced fluorescence in sub-atmospheric pressure nitrogen pulsed barrier discharge. The results showed that reducing the pressure enhanced the production of atomic nitrogen during afterglow and extended the lifetime of atomic nitrogen near the anode. This improved the chemical activity near the anode.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
A. Walsten, K. Xu, C. Sanderson, C. Ballmann, D. Matyas
Summary: The study showed that adjusting the external electric field, frequency, and gas mixture ratio can control the timing and intensity of nanosecond pulsed atmospheric pressure dielectric barrier glow discharge in helium with 1% of argon.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Multidisciplinary
E. C. Stancu, A. Quade, F. Hempel
Summary: In this study, the bio-decontamination of PU and PVC was performed using corona discharge with a scanning procedure. Increasing the number of scans enhanced the effectiveness of plasma treatment against E. coli and S. aureus. Changes in polymer surface properties after plasma treatment were also examined.
ROMANIAN REPORTS IN PHYSICS
(2022)
Article
Optics
Zhifan Zhang, Peng Lei, Duluo Zuo, Xinbing Wang
Summary: This study investigates the volume scalability of high-density metastable argon atoms using a segmented discharge configuration. By connecting two discharge zones in parallel and charging them with thin wires and peaking capacitors, a uniform and dense plasma was achieved. The results demonstrate the feasibility of using segmented discharge for the development of optically pumped rare gas lasers.
CHINESE OPTICS LETTERS
(2022)
Article
Physics, Fluids & Plasmas
L. Kusyn, D. Prokop, Z. Navratil, T. Hoder
Summary: A time-correlated single photon counting-based optical emission spectroscopy technique is used to study the nanosecond-pulsed barrier discharge in atmospheric pressure argon gas. The development of the light intensities from all ten Ar 2p(1-10) radiative states is recorded with high spatio-temporal resolution. Different stages of the discharge development are identified and the quantified relative 2p(1-10) densities provide insight into the ultra-fast discharge kinetics and potential for future diagnostics of ionized argon plasmas. Additionally, the electrical characterization of the discharge using a simple equivalent circuit reveals new findings for similar discharges.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
L. F. A. Almada, K. E. S. Fontes, J. O. Vitoriano, V. R. M. Melo, F. E. N. Fraga, C. Alves
Summary: By monitoring salt crystallization in droplets of hypersaline solution on a glass slide under controlled conditions, it was observed that pulsed corona discharge (PCD) could accelerate crystal formation, leading to different crystal morphology compared to natural evaporation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Review
Biochemistry & Molecular Biology
Kinga Kutasi, Nina Recek, Rok Zaplotnik, Miran Mozetic, Mitja Krajnc, Peter Gselman, Gregor Primc
Summary: Aflatoxins contamination is a significant economic burden affecting 25% of global food crops, with methods like irradiation and gaseous plasma showing promise in degradation. However, further research is needed to understand the exact mechanisms behind these techniques. The lack of appropriate guidance in interpreting results remains a major scientific challenge.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Physics, Multidisciplinary
Gaetan Wattieaux, Valentin Ferrer, Jean-Philippe Sarrette, Nofel Merbahi, Olivier Eichwald
Summary: The spatial and temporal evolution of ozone density in a 1 cm electrode gap pulsed corona discharge at atmospheric pressure with no gas flow was studied. The results showed a quasi uniform density of ozone up to 10 cm from the electrode gap after only 30 s of ignition, indicating a wide distribution of ozone in the reactor cell predominantly due to turbulence induced by the ionic wind. The mapping of ozone density with respect to power measurement allowed for the estimation of ozone production yield in terms of mass per electrical energy.
Article
Chemistry, Multidisciplinary
Nima Bolouki, Wen-Hui Kuan, Yu-Yun Huang, Jang-Hsing Hsieh
Summary: The study shows that different gas species have a significant impact on the pH level, ORP level, nitrite/nitrate concentrations, and hydrogen peroxide content of plasma-activated water (PAW). Argon and oxygen plasmas do not significantly affect the pH level of PAW, while air and nitrogen plasmas cause a sharp decrease in pH during the treatment. Additionally, oxygen plasma provides the highest level of hydrogen peroxide, while argon plasma, despite consuming less power, still has relatively high hydrogen peroxide contents compared to nitrogen and air plasmas.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
V. A. Kharlamov, I. V. Polyakova, S. A. Gorbatov, I. M. Medzhidov, D. I. Petrukhina, D. V. Basyrova, N. V. Glushchenko, I. A. Ivanov, V. N. Tikhonov, A. V. Tikhonov
Summary: This study investigates the oxidative effects of nonthermal atmospheric-pressure argon plasma and examines the feasibility of using a ferrous sulfate dosimeter (Fricke dose meter) to measure its oxidation properties. The results demonstrate that the presence of nonthermal plasma in a ferrous sulfate dosimeter sample leads to the formation of oxidants, determined by the transition of iron ions from the divalent to trivalent state.
INSTRUMENTS AND EXPERIMENTAL TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Bangdou Huang, Cheng Zhang, Wenchao Zhu, Xinpei Lu, Tao Shao
Summary: This study investigates the propagation characteristics of typical ionization waves in nanosecond pulsed atmospheric pressure plasma jets, revealing the development of IW fronts, variations in E-z trends, and the impact of different target conditions on IWs.
Article
Polymer Science
Samira Elaissi, Norah A. M. Alsaif
Summary: A nonthermal atmospheric plasma reactor was used to sterilize polymer surfaces in a biological medium. The study analyzed the behavior of a dielectric barrier discharge (DBD) and its parameters, and found that increasing voltage or frequency increased ionization levels and sterilization efficiency. The study also identified the need for short gap width and oxygen admixture for effective bio-decontamination. These findings can benefit plasma-based pollutant degradation devices.
Review
Energy & Fuels
Vasily Yu. Kozhevnikov, Andrey V. Kozyrev, Victor F. Tarasenko, Aleksandr O. Kokovin, Evgeni Kh. Baksht, Nikita P. Vinogradov
Summary: This short review presents theoretical and experimental studies on various modes of corona discharge in atmospheric pressure air. The authors investigate and analyze the space-time evolution of discharge in needle-to-plane geometry, revealing several stages of discharge development. The experimental data includes measurements of plasma glow optical characteristics and corona discharge current pulse profiles with high spatial and time resolution. The findings are rigorously evaluated through critical comparisons with other research groups.
Article
Environmental Sciences
Mostafa Elsayed Hassan, Mario Janda, Zdenko Machala
Summary: The study investigates the transport of gaseous H2O2 and O3 into water through plasma-liquid interactions. It is found that electrosprayed microdroplets have a larger total surface area than bulk water, but have a shorter lifetime. Only microdroplets with diameters below 40μm could achieve saturation by O3 during their lifetime, and longer-lived bottom microdroplets also contribute significantly to the solvation of H2O2 and O3 in water electrospray.
Review
Biochemistry & Molecular Biology
Peter Polcic, Zdenko Machala
Summary: Cold plasmas can affect cell physiology and viability, leading to various technologies for sterilization, food processing, seed germination, and cell therapy. However, the mechanisms of plasma-cell interactions are still poorly understood, necessitating the use of simple eukaryotic models to study these effects.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Physics, Fluids & Plasmas
N. Minesi, P. Mariotto, E. Pannier, G. D. Stancu, C. O. Laux
Summary: Numerical simulations were used to study the mechanism of air ionization by a nanosecond discharge under atmospheric conditions. The model showed that excited electronic states of O and N atoms play a key role in plasma ionization.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Applied
Mario Janda, Mostafa E. Hassan, Viktor Martisovits, Karol Hensel, Michal Kwiatkowski, Piotr Terebun, Joanna Pawlat, Zdenko Machala
Summary: The study presents a diagnostic technique for online monitoring of electrostatic spray microdroplets, allowing for simultaneous electrical and optical diagnostics. Based on laser light attenuation, the technique enables estimations of microdroplet speed and size, as well as monitoring of dripping frequency and fragmentation of microdroplets and water filaments.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Dominika Sersenova, Zdenko Machala, Vanda Repiska, Helena Gbelcova
Summary: Plasma medicine is a new field focusing on biomedical and clinical applications of cold gas plasmas, including their anticancer effects. Effects of plasma-activated liquids (PAL) on cancer cells showed selectivity compared to normal fibroblasts, depending on correctly chosen activation time and PAL concentration. Plasma-generated hydrogen peroxide may play a role in the selectivity effect of PAL on cancer cells.
Article
Physics, Fluids & Plasmas
Ciprian Dumitrache, Arnaud Gallant, Nelson de Oliveira, Christophe O. Laux, Gabi Daniel Stancu
Summary: This work presents a femtosecond two-photon absorption laser-induced fluorescence (fs-TALIF) diagnostic for measuring ground-state atomic nitrogen in nanosecond repetitively pulsed (NRP) discharges. The technique allows for high spatial and temporal resolution measurements at elevated pressures. The fs-TALIF at high laser intensity regime was found to have a detection limit that is approximately one order of magnitude better than previously reported techniques.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Michal Pastorek, Maria Suchonova, Barbora Konecna, Slavomir Pasztor, Jakub Petrus, Nadja Ivaskova, Peter Celec, Roman Gardlik, Zdenko Machala, L'ubomira Tothova
Summary: Urinary tract infections (UTI) caused by resistant uropathogenic bacteria are a serious health concern. This study aimed to evaluate the potential of cold plasma activated liquid (PAL) as a treatment for UTI using an animal model. However, the in vivo experiments showed that PAL had no significant effect on bacterial load in the mouse model of UTI, possibly due to the attenuating effect of urine and its toxicity on immune cells.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2022)
Article
Physics, Fluids & Plasmas
N. Q. Minesi, V. P. Blanchard, E. Pannier, G. D. Stancu, C. O. Laux
Summary: This study investigates the effects of nanosecond repetitively pulsed (NRP) discharges in burnt gases, filling a gap in knowledge in this area. The researchers performed quantitative optical emission spectroscopy and measurements of electrical energy deposition to analyze the temperature and concentration variations during the discharge and characterize its properties. These measurements are important for future research, testing discharge kinetic models, and deriving a simplified model of plasma-assisted combustion.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Gervais B. Ndiffo Yemeli, Mario Janda, Zdenko Machala
Summary: This study investigates the potential of using non-thermal plasma for seed priming to improve the yield of pea seeds. Direct plasma treatment significantly improves the yield and has a long-term effect. Indirect treatment improves certain growth parameters of pea plants. Scanning electron microscopy analysis reveals morphology changes on the surface of the pea seeds induced by the treatments.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2022)
Article
Physics, Multidisciplinary
Robin Mentheour, Zdenko Machala
Summary: In this study, the antibacterial effect of reactive oxygen and nitrogen species (RONS) in plasma-activated water (PAW) on the inactivation of E. coli bacteria was investigated. It was found that the presence of both nitrites (NO2-) and hydrogen peroxide (H2O2) in PAW exhibited an enhanced antibacterial effect, which was further reinforced by the mild pulsed electric field (PEF) treatment. The results suggest a synergy between the chemical and physical plasma agents, opening new perspectives for applications in both plasma and PEF research areas.
FRONTIERS IN PHYSICS
(2022)
Article
Chemistry, Physical
Michal Kwiatkowski, Piotr Terebun, Katarina Kucerova, Barbora Tarabova, Zuzana Kovalova, Aleksandra Lavrikova, Zdenko Machala, Karol Hensel, Joanna Pawlat
Summary: The purpose of this study is to determine the operating parameters of an atmospheric pressure, radio-frequency DBD plasma jet reactor for precise treatment of biological materials. The results showed that a narrow shape of plasma stream can generate significant amounts of H2O2, allowing for mild decontamination of bacteria at a relatively low power of the system, which is safe for the treatment of biological materials.
Article
Biochemistry & Molecular Biology
Anna Strizova, Paulina Smatralova, Petra Chovancikova, Zdenko Machala, Peter Polcic
Summary: Exposure of living cells to non-thermal plasma affects cell physiology and often results in cell death. This study investigated the involvement of cellular components or pathways in plasma-induced cell killing, revealing that mitochondria play a crucial role in both the damage and signaling, leading to cell protection.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Physics, Applied
Barbora Gromova, Barbora Konecna, Maria Suchonova, Slavomir Pasztor, Peter Celec, Lubomira Tothova, Michal Lichvar, Jaroslav Budis, Jan Radvanszky, Diana Rusnakova, Tomas Szemes, Zdenko Machala, Roman Gardlik
Summary: This study analyzed the impact of plasma-activated water (PAW) on oxidative status and gut microbiota diversity in healthy mice and mice with inflammatory bowel disease (IBD). The results showed that PAW increased oxidative stress markers in the colon tissue, especially in IBD mice. Interestingly, PAW increased microbial diversity in a healthy gut but decreased it in an inflamed gut. The findings suggest that PAW may not have therapeutic potential in treating IBD.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Physics, Fluids & Plasmas
Nicolas Q. Minesi, Pierre B. Mariotto, Erwan Pannier, Axel Vincent-Randonnier, Gabi Daniel Stancu, Christophe O. Laux
Summary: This study focuses on the formation of fully ionized plasmas in ambient air by nanosecond pulsed discharges, called thermal spark. The article first presents experimental characterization of the electron number density during the pulse, showing an increase up to 10^19 cm^-3 with sub-nanosecond resolution using three techniques based on optical emission spectroscopy. The study also develops a 0D kinetic mechanism to explain the observation, highlighting the importance of excited state kinetics in the thermal spark formation.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
