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
Binbin Xia, Heema Kumari Nilesh Vyas, Renwu Zhou, Tianqi Zhang, Jungmi Hong, Joanna G. Rothwell, Scott A. Rice, Dee Carter, Kostya (Ken) Ostrikov, Patrick J. Cullen, Anne Mai-Prochnow
Summary: Microbial biofilms cause contaminations and pose risks to human health. Cold plasma and plasma-activated water (PAW) have disinfectant activity, but the best gas choice for generating PAW is unclear.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Physics, Fluids & Plasmas
Albina Tropina, M. N. Shneider, R. B. Miles
Summary: A kinetic model of a non-equilibrium water vapor plasma created by a nanosecond pulsed discharge at elevated temperatures and at low pressure is presented. Simulation results show good agreement with experimental data, revealing that the decay of plasma in pure water vapor is controlled by dissociative recombination and the formation of vibrationally excited species can be observed.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Energy & Fuels
Qiuying Wang, Xiaomei Zhu, Bing Sun, Zhi Li, Jinglin Liu
Summary: This paper investigates the influence of dissolved oxygen on methane reforming process by liquid phase microwave discharge. The results show that reducing dissolved oxygen can improve hydrogen yield, selectivity, and energy efficiency. The study also reveals the main pathways for hydrogen production, which are dot H extraction, dot H coupling reaction, and dot OH oxidation center dot CHX.
Article
Multidisciplinary Sciences
Sayma Khanom, Nobuya Hayashi
Summary: In this study, zinc ions dissolved in water were attempted to be removed by generating zinc oxides using oxygen gas in a dielectric barrier discharge (DBD) plasma system. The removal rate of zinc oxides production was measured at different treatment periods, showing an initial increase followed by a decrease with treatment time. The optimal removal rate of zinc ions from water (29%) was achieved at a treatment period of 10 minutes, with a lower pH (7.4). The study indicates that controlling the penetration amount of active oxygens to keep the pH below 7.5 is crucial for effectively removing zinc ions and preventing a decrease in removal rate of zinc oxides' deposit.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Renwu Zhou, Tianqi Zhang, Rusen Zhou, Sen Wang, Danhua Mei, Anne Mai-Prochnow, Janith Weerasinghe, Zhi Fang, Kostya (Ken) Ostrikov, Patrick J. Cullen
Summary: The argon plasma-catalytic bubble process efficiently synthesizes H2O2 underwater using water as a reactant and solar radiation as the energy source. The principal route of H2O2 generation is the combination of dissolved (OH)-O-center dot radicals at the plasma-liquid interface of forming bubbles. Employing dual reactors and a strongly interfacial-coupled photocatalyst leads to high H2O2 production rate and energy efficiency.
Article
Food Science & Technology
Toshifumi Yuji, Kenichi Nakabayashi, Hiroyuki Kinoshita, Narong Mungkung, Yoshifumi Suzaki, Sarizam Mamat, Hiroshi Akatsuka
Summary: This study demonstrates that the decontamination performance against viable bacteria and coliform bacteria in dry powder food ingredients using an atmospheric-pressure nonequilibrium DC pulse discharge Ar + O-2 mixture gas plasma jet is proportional to the plasma irradiation time, showing a correlation between plasma irradiation time and DC pulse frequency increase.
JOURNAL OF FOOD QUALITY
(2021)
Article
Chemistry, Multidisciplinary
Qiang Tang, Zhibin Hu, Xiaxia Cui, Zechao Tao, Jau Tang
Summary: By introducing a ceramic tube, a water vapor electrodeless microwave plasma device is proposed to avoid the corrosion of metal electrodes. The device can work directly with liquid water without complex evaporation equipment. The study found that when the microwave power is greater than 800 W, the plasma torch can be excited permanently and stably without loss of ceramic. Optical spectroscopy confirmed the generation of oxygen atom, hydroxyl radical, and hydrogen atom during the decomposition of water vapor. The microwave discharge also improved the crystallinity of the ceramic. This work enriches the microwave plasma techniques for water vapor and has various applications in electric propulsion, hydrogen production, and surface treatment.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Rani Vertongen, Georgi Trenchev, Robbe Van Loenhout, Annemie Bogaerts
Summary: Studying plasma reactors in series as a recycle flow can enhance CO2 conversion, while the addition of O2 has a detrimental effect on the conversion. Opportunities for further improvements lie in specialized separation techniques.
JOURNAL OF CO2 UTILIZATION
(2022)
Review
Physics, Applied
N. L. Aleksandrov, E. M. Bazelyan, A. A. Ponomarev, A. Yu Starikovsky
Summary: In this review, the kinetics of non-equilibrium discharge plasma with water and hydrocarbon ions is described. This includes a core database of rate coefficients as a function of temperature, pressure, and local electric field. Cluster ions are highlighted as important in plasmas at not-too-low gas pressures, while most studies of ion-molecule reactions have been performed at low pressures without considering cluster ions. The influence of water ions on the properties of streamer discharges in humid air gaps and the decay of non-equilibrium plasma with water and hydrocarbon ions in combustible gaseous mixtures are also analyzed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Applied
Jing Qian, Longfei Yan, Keqin Ying, Ji Luo, Hong Zhuang, Wenjing Yan, Jianhao Zhang, Ying Zhao
Summary: Plasma-activated water (PAW) and ultrasound were used to solve the problems of microbial contamination and protein loss caused by conventional thawing methods. The new thawing treatments had no significant effect on the quality and protein composition of chicken meat, and even improved protein digestion.
Article
Materials Science, Multidisciplinary
Yanbin Xin, Jingyu Liu, Quanli Wang, Bing Sun
Summary: This study reports a novel method to efficiently produce reactive species in water using atmospheric pinhole discharge. The plasma is generated in bubbles on both sides of the pinhole, leading to increased contact volume with the liquid. This method can generate a large amount of reactive oxygen species without the addition of O-2, and can be maintained at a relatively high solution conductivity.
Article
Engineering, Environmental
Xiaoping Wang, Jie Mei, Jihang Luo, Yunzhu Huang, Dionysios D. Dionysiou
Summary: A bubble-film hybrid plasma reactor was designed to enhance the removal of organic contaminants in wastewater, showing that the presence of a water film can increase the yield and mass transfer efficiency of active species. The research demonstrated the significant potential of the bubble-film multistage process for improving organic pollutant removal in wastewater treatment with plasma.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Bjorn Loenders, Yannick Engelmann, Annemie Bogaerts
Summary: The study found that vibrational excitation has a positive impact on the TOF of catalytic CH4 dissociation, while plasma-generated radicals mainly influence the surface chemistry. Plasma-generated radicals and stable intermediates enhance the TOFs of COx and oxygenates, increase selectivity, and make the formation of HCOOH more significant.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Multidisciplinary Sciences
Reona Muto, Nobuya Hayashi
Summary: The sterilization characteristics of active species generated by an atmospheric dielectric barrier discharge plasma using air and oxygen at the inner surface of silicone tubing were investigated. The sterilization was completed within 30 min by active particles generated from the air plasma. The main factors contributing to the sterilization by air plasma were HNO3 and N2O5.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
Satoshi Watanabe, Reoto Ono, Nobuya Hayashi, Masaharu Shiratani, Kosuke Tashiro, Satoru Kuhara, Asami Inoue, Kaori Yasuda, Hiroko Hagiwara
JAPANESE JOURNAL OF APPLIED PHYSICS
(2016)
Article
Physics, Applied
Yasuhiro Sakai, Zhen Liu, Masaaki Goto, Nobuya Hayashi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2016)
Article
Physics, Applied
Akira Yonesu, Kazufumi Hara, Tatsuya Nishikawa, Nobuya Hayashi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2016)
Article
Polymer Science
Reoto Ono, Tetsuya Ohtsubo, Nobuya Hayashi, Reona Aijima, Yoshio Yamashita, Masaaki Goto
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2016)
Article
Materials Science, Multidisciplinary
Reoto Ono, Shohei Uchida, Nobuya Hayashi, Rina Kosaka, Yasutaka Soeda
Article
Materials Science, Multidisciplinary
Tatsuya Nishikawa, Norihito Abe, Akira Yonesu, Nobuya Hayashi
Article
Physics, Fluids & Plasmas
Nobuya Hayashi, Yukie Miyamaru, Reona Aijima, Yoshio Yamashita
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2019)
Article
Polymer Science
Nobuya Hayashi, Masaaki Goto, Tomomasa Itarashiki, Akira Yonesu, Akikazu Sakudo
JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
(2018)
Article
Materials Science, Multidisciplinary
Tatsuya Nishikawa, Norihito Abe, Akira Yonesu, Nobuya Hayashi
Review
Physics, Applied
Koichi Takaki, Nobuya Hayashi, Douyan Wang, Takayuki Ohshima
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Physics, Applied
Norrawit Tonmitr, Akira Yonesu, Nobuya Hayashi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Nobuya Hayashi, Yi-Ci Yao, Yusuke Matsunaga
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Fluids & Plasmas
Norrawit Tonmitr, Takahiko Mori, Masashi Takami, Akira Yonesu, Nobuya Hayashi
Summary: The study investigated a method of surface sterilization using pulsed LF-microwave hybrid plasma, finding that pulsed microwaves can lower gas temperature and enhance sterilization efficiency, especially for heat-sensitive materials.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Agronomy
Nobuya Hayashi, Kyotaro Yamamoto
Summary: The variations in gene expression of plant leaves were investigated by exposing seeds and leaves to oxygen or air plasmas. Oxygen plasma irradiation on seeds enhanced leaf growth by increasing gene expression for protein synthesis and oxidative-reduction reactions, while decreasing gene expression related to DNA methylation and histone modification. The suppression of leaf growth by oxygen plasma was due to increased gene expression of heat shock protein and redox reaction, and decreased expression of photosynthesis and glycoprotein. Gene expression variations induced by air plasma irradiation were similar to those caused by oxygen plasma. Active oxygen species played a major role in inducing gene expression variations in plants.
Article
Chemistry, Multidisciplinary
Agnieszka Starek-Wojcicka, Agnieszka Sagan, Piotr Terebun, Michal Kwiatkowski, Emilia Osmolska, Marta Krajewska, Elzbieta Grzadka, Narumol Matsuyama, Nobuya Hayashi, Joanna Pawlat
Summary: This paper presents the results of an experiment on the quality of fresh pressed tomato juice using a plasma reactor operating at atmospheric pressure. The study found that Cold Atmospheric Plasma (CAP) treatment significantly increased the total soluble solids, pH, lycopene, and vitamin C of the tomato juice compared to the control. The physicochemical values of the plasma-treated juice also changed at a slower rate during storage, and a significant reduction in microbial count was observed after 300-600 s of CAP treatment.
APPLIED SCIENCES-BASEL
(2023)
