Article
Materials Science, Multidisciplinary
Slawomir Jodzis, Klaudia Baran
Summary: The study found that gas temperature has no significant effect on ozone concentration drop, but the appearance of electrical discharges leads to intensive ozone decomposition even at low temperatures and low powers. Ozone decomposition is mainly caused by momentary increase in gas temperature in microdischarge channels, hindering the removal of heat and affecting ozone concentration achieved.
Article
Chemistry, Physical
Mostafa El-Shafie, Shinji Kambara, Yukio Hayakawa
Summary: The energy and exergy efficiencies of three hydrogen production systems from ammonia decomposition using DBD plasma were compared, demonstrating that adding a pre-catalytic reactor (CR) and zeolite material enhanced hydrogen production rates.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Xinxin Gou, Dingkun Yuan, Lijian Wang, Linjie Xie, Linsheng Wei, Guangxue Zhang
Summary: This investigation focuses on the electrical diagnostics and ozone generation capability in a dielectric barrier discharge ozone generator utilizing water as the ground electrode. Results show that specific input energy peaks at 8 kHz when the frequency changes from 5 kHz to 10 kHz. The maximum ozone generation efficiency reaches 391.66 g/kWh at a discharge frequency of 6 kHz. This investigation provides a new method for high efficient ozone production.
Article
Engineering, Environmental
Lan Tang, Sining Zhou, Fan Li, Lianpeng Sun, Hui Lu
Summary: In this study, a novel ozone micronano-bubble (MNB)-enhanced treatment system was constructed for efficient and selective removal of refractory antibiotics from high-strength antibiotic production wastewater. The study identified singlet oxygen (1O2) as a crucial active species in the ozone MNB system for the first time. The oxidation mechanisms of the antibiotics in the ozone MNB system were systematically investigated.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Alexandra Waskow, Lorenzo Ibba, Max Leftley, Alan Howling, Paolo F. Ambrico, Ivo Furno
Summary: This study investigated optimal conditions in a surface dielectric barrier discharge (SDBD) setup through a parametric study, finding that treatment time and voltage are key parameters for accelerating seed germination. However, no clear conclusion on causative agents could be drawn from the results.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Physics, Fluids & Plasmas
Xin Zeng, Yafang Zhang, Liangyin Guo, Wenquan Gu, Ping Yuan, Linsheng Wei
Summary: The study found that the presence of plain quartz fibers and loaded quartz fibers in the DBD configuration could promote ozone generation. In a packed-bed reactor, increasing electric field in the discharge gap enhanced ozone concentration and yield. Additionally, the catalytic effect of silica nanoparticles on fiber surfaces increased ozone production by prolonging the retention time of active species and enhancing surface reactions.
PLASMA SCIENCE & TECHNOLOGY
(2021)
Article
Food Science & Technology
N. N. Misra, Alex Martynenko
Summary: This study experimentally investigated the enhancement of drying rate of a model food (agar gel) through the electrohydrodynamic effect in cold plasma from a dielectric barrier discharge. The major factor governing drying was found to be electric field strength according to the results.
INNOVATIVE FOOD SCIENCE & EMERGING TECHNOLOGIES
(2021)
Article
Green & Sustainable Science & Technology
Jianming Liao, Shuaiming He, Lihuan Mo, Shasha Guo, Pengcheng Luan, Xi Zhang, Jun Li
Summary: The study demonstrates that the combination of thermomechanical pulping of plant residues with ozone treatment can reduce costs, improve physical performance, and has the potential for large-scale applications. Ozone has a significant impact on fiber structure and lignin content, and the oxidation process can significantly enhance physical properties, proving the feasibility of mass production.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Electrical & Electronic
Ju-hoon Park, Jeong-sook Park, Jae-hyeouk Lee, Byeong-ho Jeong
Summary: Atmospheric pressure plasma ozone can be utilized for effective sterilization in complex structures. Dielectric barrier discharge (DBD) devices can distribute plasma evenly and limit the charge supplied. A high-density plasma ozone generator using DBD achieved 99.9% sterilization in a short time.
JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Ao Xiao, Dawei Liu, Yan Li
Summary: This paper reports the development of a dielectric barrier discharge array to generate a high concentration of active aqueous plasma substances in tap water. The device can realize a uniform, stable, and large-area discharge in a large volume of tap water, with the advantages of low cost, high integration, and reusability. Using the device, the pH of tap water can be reduced from 8.10 to 2.54 in 1 hour, and it shows efficient sterilization effect against bacteria.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Environmental
Yuhang Wang, Shengjun Xi, Fanghe Zhao, Lewis Gregory Huey, Tong Zhu
Summary: Nighttime oxidation by nitrate radicals has significant implications for aerosol formation, climate, and human health. While a previous study found an increase in nitrate production in China from 2014 to 2019, contrasting trends were observed in the U.S. and Europe. However, our analysis of observational data from 2014 to 2022 shows that nitrate production in China did not increase during this period, primarily due to a continuous decrease in the NO2/O-3 ratio. Interestingly, our findings also suggest the potential for a surge in urban nighttime nitrate radicals despite emission reduction efforts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Yixuan Yu, Haonan Wang, Hao Li, Ping Tao, Tianjun Sun
Summary: In this study, MnOx, CuO, and Cu/MnOx catalysts were synthesized and their structures were characterized. The influence of H2O on the variation of active sites during O-3 decomposition was investigated. It was found that Cu/MnOx showed the highest O-3 elimination rate under dry conditions, while under humid conditions, Cu/MnOx exhibited the strongest catalytic activity.
Article
Engineering, Environmental
Qian Zhang, Jifei Liao, Guangzhi Du, Yu Lin, Xiaoqiong Liu, Rui Wang, Lingyu Huang, Wenyan Xiao, Jiahao Chen, Yan Fu
Summary: Ozone has become an increasingly prominent air pollutant. This paper introduces a series of novel phosphate catalysts for ozone decomposition, and finds that Co(3_x)Ni(x)(PO4)2 exhibits outstanding catalytic activity and stability at a relative humidity of 65%. Moreover, Co1.8Ni1.2PO4 can degrade ozone even in the presence of water vapor at a humidity of 90%. This research demonstrates the potential of phosphate catalysts for efficient ozone decomposition.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Jing Lou, Jiutao An, Xiangyou Wang, Meng Cheng, Yingjun Cui
Summary: This study investigates a novel process of dielectric barrier discharge plasma/vacuum ultraviolet/peroxymonosulfate (DBD/VUV/PMS) for the nonradical-dominated degradation of sulfadiazine (SDZ). The hybrid system shows significant synergistic effects, achieving high removal rates of SDZ and TOC within a short period of time. The research also reveals that 1O2 is the primary active substance and the degradation of SDZ follows a nonradical reaction pathway. Additionally, the process reduces energy consumption and shows promising application prospects.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Physics, Applied
Yijia Song, Qinghua Huang, Chuanlong Ma, Qi Yang, Zhan Shu, Pengfei Liu, Qiang Chen, Anton Nikiforov, Qing Xiong
Summary: A novel sandwich-like plasma device is proposed in this study for engineering superhydrophobic (SH) surfaces, utilizing the coordination of dual power sources to control surface hydrophobicity. The two-stage dielectric barrier discharges (DBDs) achieve easy ignition and enhanced stability, as well as fragmentation and dispersion of species and nanoparticles for SH surface fabrication. This study provides insights on a new pathway based on plasma-assisted method for surface engineering and material processing at atmospheric pressure.
PLASMA PROCESSES AND POLYMERS
(2021)
Article
Physics, Fluids & Plasmas
Petr Hoffer, Petr Bilek, Vaclav Prukner, Zdenek Bonaventura, Milan Simek
Summary: In this study, we examined the gaseous structures occurring in response to nanosecond micro-discharges produced in deionised water. The results showed that the amplitude and repetition frequency of the applied high-voltage pulses affected the number and size distribution of micro-bubbles near the anode needle. The statistical analysis revealed that the probability of producing bubble-assisted nanosecond discharge in the liquid phase increased rapidly with the discharge repetition rate (>0.5 Hz). The study also found that while the cavitation bubble formed around the anode disintegrated quickly, sub-micrometric structures and fragmented micro-bubbles remained for an extended period of time.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Zdenek Bonaventura, Petr Bilek, Jan Tungli, Milan Simek
Summary: A bouncing-like mechanism for electron multiplication inside nano-ruptures in liquid water has been proposed recently. This mechanism is caused by strong electrostrictive forces and leads to the formation of electron avalanches. The electrons emitted from the water surface support the propagation of the avalanche, and the avalanche itself becomes a source of parent electrons that cause secondary emission. The process of electron secondary emission is analyzed based on simulation results, allowing for an in situ study of the related physical processes. The results show that the lifetime of an electron in an avalanche is about 0.1 to 0.2 picoseconds, and the electron experiences multiple bounces before ending up in liquid water. Additionally, the secondary electrons are formed in a thin layer adjacent to the nano-rupture surface.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
I Adamovich, S. Agarwal, E. Ahedo, L. L. Alves, S. Baalrud, N. Babaeva, A. Bogaerts, A. Bourdon, P. J. Bruggeman, C. Canal, E. H. Choi, S. Coulombe, Z. Donko, D. B. Graves, S. Hamaguchi, D. Hegemann, M. Hori, H-H Kim, G. M. W. Kroesen, M. J. Kushner, A. Laricchiuta, X. Li, T. E. Magin, S. Mededovic Thagard, V Miller, A. B. Murphy, G. S. Oehrlein, N. Puac, R. M. Sankaran, S. Samukawa, M. Shiratani, M. Simek, N. Tarasenko, K. Terashima, E. Thomas, J. Trieschmann, S. Tsikata, M. M. Turner, I. J. van der Walt, M. C. M. van de Sanden, T. von Woedtke
Summary: The 2022 Roadmap is a publication that aims to identify important challenges in the field of low-temperature plasma (LTP) physics and technology. It includes visions from 41 leading experts representing 21 countries and five continents, with a focus on new topics and areas of interest in the field. The roadmap is expected to contribute to the continued development of LTP science and technology in the next 5-10 years.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Petr Bilek, Lucia Kuthanova, Tomas Hoder, Milan Simek
Summary: This work investigates the kinetics of the N-2(A(3)Sigma(+)(u), v) state in the atmospheric-pressure Townsend discharge (APTD) in pure nitrogen. A detailed state-to-state vibrational kinetic model is developed to accurately predict the density and emission spectra of the N-2 state, benefiting from the determination of the electric field and electron density profile. The results provide insights into the processes responsible for establishing and sustaining the APTD mechanism and are important for understanding secondary electron emission from dielectric surfaces.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Vitaliy Stelmashuk, Vaclav Prukner, Karel Kolacek, Andrii Tuholukov, Petr Hoffer, Jaroslav Straus, Oleksandr Frolov, Vit Jirasek
Summary: This study investigates the acoustic and spectral characteristics of underwater electric sparks generated between two plate electrodes using synchronized gas bubble injection. The size of the gas bubble is found to strongly affect the emission intensity and shockwave amplitude of the spark. Additionally, the study reveals that the plasma in the underwater spark channel does not correspond to a source of black-body radiation.
Article
Physics, Applied
Alexandr Frolov, Vitaliy Stelmashuk, Karel Kolacek, Vaclav Prukner, Andrii Tuholukov, Petr Hoffer, Jaroslav Straus, Jiri Schmidt, Vit Jirasek, Eduardo Oliva
Summary: This study investigates the influence of pressure on the size of gas bubbles in an underwater discharge channel. Different types of bubbles with varying triggering difficulties were examined using H (alpha) line broadening as a diagnostic tool. The pressure in the discharge channel was found to decrease with increasing bubble size.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Engineering, Chemical
Petr Hoffer, Krzysztof Niedoba, Vit Jirasek, Vaclav Prukner, Milan Simek
Summary: This article proposes a geometrical analogue of a surface coplanar DBD electrode system that can generate multiple filamentary discharges expanding along the surface of a thin water layer in a flow-through type reactor. The discharges are produced by periodic bipolar high-voltage pulses and transition from the cold streamer phase to the hot spark phase. The analysis shows significant heating of the filaments and increased electron number density, demonstrating the streamer to spark transition.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2023)
Article
Physics, Fluids & Plasmas
Martina Mrkvickova, Lucia Kuthanova, Petr Bilek, Adam Obrusnik, Zdenek Navratil, Pavel Dvorak, Igor Adamovich, Milan Simek, Tomas Hoder
Summary: We studied the development of electric field in weak microseconds-lasting atmospheric pressure Townsend discharge in pure nitrogen using four different methods. These methods include laser-aided electric field induced second harmonics (EFISH), optical emission-based first negative/second positive systems (FNS/SPSs) intensity ratio, electrical equivalent circuit approach, and determination of the Townsend first coefficient a(E/N) from the spatial optical emission profile. The values of the electric field obtained from these methods, regardless of absolute differences, fall within a reasonable range. The limitations and advantages of each method are discussed in detail, and potential future steps for improvement are identified.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Mathematics
Jan Mikes, Ivan Soukup, Stanislav Pekarek
Summary: This study presents a three-dimensional numerical model for the initial phase of the surface dielectric barrier discharge in planar configuration. Different from previous models, this study focuses on the numerical theory behind the discharge phenomenon and the linear approximation of ionization rate. The results demonstrate the trajectories and velocities of electrons and ions, reflecting the active region of the discharge.
Article
Physics, Fluids & Plasmas
Petr Hoffer, Vaclav Prukner, Garima Arora, Milan Simek
Summary: This study reports the mechanism and further developments of a nanosecond DBD-like discharge propagating along the water-air interface to produce plasma-activated water. By combining ultrafast optical imaging and electrical characteristics, the researchers captured the morphological changes of individual discharge phases with high temporal resolution. The study reveals that a diffuse bi-directional ionizing avalanche expands rapidly over the liquid surface during the first nanoseconds, and discrete plasma filaments form later due to an ionization instability. The filaments retain the diffuse plasma at both ends as they elongate. The findings are important for understanding the mechanism of nanosecond DBD-like discharge in producing plasma-activated water.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Fluids & Plasmas
Petr Bilek, Tiago Cunha Dias, Vaclav Prukner, Petr Hoffer, Vasco Guerra, Milan Simek
Summary: The emission spectra of a streamer discharge in pure nitrogen are essential for studying the kinetics of excited electronic states of N2 and validating numerical models. In this work, we characterized a streamer monofilament in a dielectric barrier discharge configuration and obtained time-resolved images and emission spectra with nanosecond resolution. The results provide evidence of cathode-directed streamer formation and allow for the determination of streamer propagation velocity and typical E/N values.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
