Article
Physics, Fluids & Plasmas
Xiaochun Xue, Lei Huang, Yonggang Yu, Yi Liu
Summary: This study experimentally investigates the interface instability and expansion mechanism of a thermal plasma jet. It provides a better understanding of the complex fluid-dynamic interactions occurring on the surface of the plasma bubble due to the Kelvin-Helmholtz effect. The study utilizes a plasma generator, pressure measurement system, and high-speed camera system to trace the development processes of the plasma interface. The results show that the plasma jet initially has a better advantage of radial expansion, but over time, the axial expansion velocity exceeds the radial expansion velocity, resulting in a torch-shaped jet body. Turbulent mixing and energy dissipation lead to the breaking of the jet boundary and the occurrence of local rupture phenomena on the plasma surface.
PHYSICS OF PLASMAS
(2023)
Article
Mechanics
Xiuxiu Chen, Zhengzhong Sun
Summary: This article investigates the energy transformation characteristics of the plasma synthetic jet actuator (PSJA) through theoretical, experimental, and numerical research. The results show that the size and formation time of the plasma kernel can be predicted and the peak pressure and temperature rise in the cavity can be calculated. The proportion of kinetic energy increases linearly with non-dimensional deposition energy, while potential energy has a reverse tendency with non-dimensional cavity volume and deposition energy.
Article
Chemistry, Physical
Hyo Jun Jang, Bhum Jae Shin, Eun Young Jung, Gyu Tae Bae, Jae Young Kim, Heung-Sik Tae
Summary: This study presents a polymerization method for forming polypyrrole films from liquid pyrrole using a solution plasma process. By adjusting the operating voltage waveform and using negatively or positively biased bipolar square-wave pulses, solution plasma was generated and the pH value of the pyrrole solution was increased. Polypyrrole films were successfully deposited onto a metallic substrate under specific operation conditions.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Takeshi Ito, Tetsuo Sakka, Koichi Sasaki
Summary: This study investigated oxidation-reduction reactions on the surface of a water jet in a low-pressure inductively coupled helium plasma. The experimental results revealed simultaneous oxidation and reduction reactions at the plasma-liquid interface.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Julien Bissonnette-Dulude, Sylvain Coulombe, Thomas Gervais, Stephan Reuter
Summary: In this study, a prototype device that combines microfluidics with plasma technology is proposed for the study of plasma-liquid interactions. The transport of reactive species generated by plasma in the liquid is investigated using colorimetric analysis of hydrogen peroxide concentration. The results show that this plasma-microfluidic prototype has great potential for fundamental research in plasma-liquid interactions, and opens the way for future combinations of plasma devices with standard microfluidic devices.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Sasa-Alexandra Yehia, Nicoleta Petrea, Nicoleta Grigoriu, Sorin Vizireanu, Maria Elena Zarif, Lavinia Gabriela Carpen, Raluca-Elena Ginghina, Gheorghe Dinescu
Summary: In this paper, the degradation of four organophosphorus toxic compounds using an atmospheric pressure DBD plasma source was investigated. Different plasma conditions and treatment times were tested, and the degradation process was characterized using various measurement techniques. The results showed that Ar/N2 plasma treatment exhibited the highest degradation efficiencies for Parathion, Chlorpyrifos, and Dimethyl methylphosphonate, while Ar/compressed air plasma treatment showed relatively good degradation efficiency for Dimethoate.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Physics, Fluids & Plasmas
David Steuer, Henrik van Impel, Andrew R. Gibson, Volker Schulz-von der Gathen, Marc Boeke, Judith Golda
Summary: A new actinometry method, helium state enhanced actinometry (SEA), is proposed in this study. By measuring the emission of specific atomic states at certain wavelengths, SEA allows for the simultaneous determination of atomic oxygen density and mean electron energy. Compared to traditional actinometry methods and energy resolved actinometry (ERA), SEA offers a simplified experimental procedure and improved precision in electron energy measurement.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Shurik Yatom, Trey Oldham, Elijah Thimsen
Summary: This work provides a detailed characterization of the interaction between an argon radiofrequency plasma jet and liquid. The electron density is measured using Stark broadening of hydrogen Balmer alpha line and Thomson scattering. Supporting diagnostics are conducted to investigate channel evolution, movement, and gas temperature. Comparing the two approaches reveals the caveats and advantages for future applications.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Tlegen Kamidollayev, Juan Pablo Trelles
Summary: This study investigates the interaction between an argon plasma jet and water using a 3D time-dependent computational model. The results suggest that higher jet velocities lead to enhanced transport of reactive species across the plasma-water interface.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Yoshinobu Inagaki, Koichi Sasaki
Summary: We detected hydrated electrons in a micrometer-size water jet immersed in low-pressure plasma using laser-induced desolvation. The pulsed current indicated the transport of electrons from the water jet to the plasma when we irradiated the water jet with the 2nd, 3rd, and 4th harmonics of Nd:YAG laser pulses. We observed a proportional relationship between the amplitude of the pulsed current and the laser energy, confirming the conversion from hydrated to free electrons by laser-induced desolvation. The photon energy and the quantum yield of electron transport showed an interesting relationship, with the experimental quantum yield being much higher than predicted in low photon energy region.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mohamed Shaker S. Adam, Saad Shaaban, Mohamed E. Khalifa, Mona Alhasani, Nashwa El-Metwaly
Summary: In this study, polar mononuclear Cu(II) and VO(II) complexes were synthesized using a sodium sulfonate ligand under green conditions. The complexes exhibited enhanced catalytic potential in the epoxidation of 1,2-cyclohexene, with the VO(II) catalyst showing higher efficiency than the Cu(II) catalyst. Furthermore, the complexes demonstrated significant antimicrobial, anticancer, and antioxidant potential compared to their free ligand, as evaluated through various biological assays. Conformational and in-silico studies were also conducted to support the newly synthesized complexes' properties.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Composites
Ziyang Zhong, Congcong Wang, Ruoyu Han, Ming Gao, Yifan Huang, Seeram Ramakrishna
Summary: Flexbile composites based on zinc oxide (ZnO) for piezoelectric sensors are synthesized using a simple and efficient plasma-liquid interaction strategy, resulting in enhanced piezoelectric response. The lamellar nanostructure of ZnO on carbon fiber (CF) surface can be regulated by adjusting plasma discharge time. With a piezoelectric coefficient d33 of 5.24 p.m./V based on the inverse piezoelectric effect, this study simplifies the fabrication process for ZnO/CF composites and offers a new approach for coupling piezoelectric materials on flexible substrates to improve piezoelectric response.
COMPOSITES COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
S. Jaiswal, E. M. Aguirre, T. van der Gaag
Summary: We presented a detailed characterization of an atmospheric pressure plasma jet that produces metastable oxygen and emits the auroral green line. Optical emission spectroscopy was used to analyze the plasma jet and understand the mechanism of metastable oxygen creation and destruction. Changes in the plasma jet behavior were observed when altering parameters.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Chuanguang Wang, Xiaohang Sun, Xiaomei Zhu, Bing Sun
Summary: This study proposes a novel strategy for reducing graphene oxide using microwave discharge plasma in liquid. The method demonstrates fast reduction, high reactivity, and low temperature, making it suitable for efficient graphene production. The plasma treatment effectively reduces the oxygen content and enhances the conductivity of graphene, resulting in superior performance as a supercapacitor electrode.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Tatiana Habib, Jose Mauricio A. Caiut, Bruno Caillier
Summary: In this study, silver nanoparticles were successfully synthesized using a non-thermal atmospheric pressure helium plasma jet, and the effect of different chemical parameters was investigated. This method provides a fast and efficient way to produce silver nanoparticles, allowing for further research under different solvent and capping agent conditions.
Article
Chemistry, Multidisciplinary
Tom D. D'Arcy, Mark R. J. Elsegood, Benjamin R. Buckley
Summary: The highly enantioselective organocatalytic tandem o-HPD-[4+2] reaction described offers a practical method for the synthesis of complex scaffolds. This approach utilizes a chiral oxaziridinium organocatalyst to afford dearomatized products in high enantioselectivity, demonstrating its potential for gram-scale applications.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Plant Sciences
Giles Grainge, Kazumi Nakabayashi, Tina Steinbrecher, Sue Kennedy, Junchen Ren, Felipe Iza, Gerhard Leubner-Metzger
Summary: Developing innovative agri-technologies is crucial for sustainable food production. This study reveals the molecular mechanisms by which non-thermal atmospheric gas plasma-activated water triggers seed dormancy release and promotes germination. By mimicking multiple environmental signals, gas plasma technologies enhance seed germination and growth, contributing to the sustainable intensification of food production.
JOURNAL OF EXPERIMENTAL BOTANY
(2022)
Article
Physics, Fluids & Plasmas
Han Xu, Shaoshuai Guo, Hao Zhang, Kai Xie
Summary: This paper investigates the effects of a rotating plasma-activated liquid on the dynamic propagation and biomedical application of a helium plasma jet. The results show that the rotating liquid can alter the spatial distribution of reactive species and affect the propagation of the plasma bullet. However, it weakens the concentrations of reactive species in the liquid and decreases the inactivation effectiveness on cancer cells. This finding is significant for understanding the plasma-liquid interaction and the application of plasma jets in biomedicine.
PLASMA SCIENCE & TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Giles Grainge, Kazumi Nakabayashi, Felipe Iza, Gerhard Leubner-Metzger, Tina Steinbrecher
Summary: Limited light availability affects seed germination timing and percentage. Seed industries are exploring interventions to mitigate this risk, and one area of research is water treated with gas plasma. However, there is limited understanding of how this solution influences seed dormancy mechanisms and photoreceptor-driven germination. This study investigated the effects of gas plasma-treated water on seed germination under low light intensities and described the impact on key physiological regulators.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Physics, Fluids & Plasmas
Hyoungcheol Kwon, Hyunsuk Huh, Hwiwon Seo, Songhee Han, Imhee Won, Jiwoong Sue, Dongyean Oh, Felipe Iza, Seungchul Lee, Sung Kye Park, Seonyong Cha
Summary: The article introduces a new deep learning platform that reduces computational load, improves prediction accuracy in 3D NAND device manufacturing, and opens up new applications such as hotspot detection and mask layout optimization.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
Han Xu, Lei Quan, Yan Liu, Hao Zhang, Mingxu Shao, Kai Xie
Summary: The potential of atmospheric-pressure plasma-treated water in biomedical-related applications has increased recently. The effects of externally applied E x E and E x B configurations on plasma jets and plasma-activated water are explored. The E x B configuration is found to improve the performance of plasma jets in biomedical applications.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
Hyoungcheol Kwon, Imhee Won, Songhee Han, Dong-Hun Yu, Deuk-Chul Kwon, Yeon Ho Im, Felipe Iza, Dongyean Oh, Sung-Kye Park, Seonyong Cha
Summary: Vertical scaling technique has limitations in 3D NAND device fabrication, while lateral scaling technique increases storage density by increasing the number of holes between slits. However, lateral scaling can lead to unpredictable size variations and distortion. This study analyzes the impact of angular etching yield and heavy inert ion strikes on the etching profiles.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
Hyoungcheol Kwon, Felipe Iza, Imhee Won, Minkyung Lee, Songhee Han, Raseong Park, Yongjin Kim, Dongyean Oh, Sung-Kye Park, Seonyong Cha
Summary: The formation of high-energy electrons and ion fluxes induced by an abnormal electron heating mode in asynchronous pulse-modulated plasma was investigated using particle-in-cell simulation. It was found that this abnormal electron heating mode only occurred for a short time in asynchronous pulsed plasmas. Enhanced production of energetic electrons accompanied this electron heating, with higher energy electrons mainly produced during the first period of the abrupt sheath expansion phase. These high-energy electrons are crucial for controlling plasma density expansion and neutralizing surface charging in the HARC etching process.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Fluids & Plasmas
Shaoshuai Guo, Kai Xie, Han Xu, Maixia Fu, Yingying Niu
Summary: When an aircraft or a hypersonic vehicle re-enters the atmosphere, the plasma sheath generated can cause communication blackout due to the attenuation of electromagnetic wave signals. A new method based on time-varying E x B fields is proposed to mitigate this problem. The method increases the current density in the plasma by introducing a time-varying electric field and applies a magnetic field to ensure continuous electromagnetic force acting on the plasma. Simulation results show that the method effectively reduces plasma electron density by generating vortex effects.
PLASMA SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Applied
Shengduo Xu, Xixi Jing, Jishen Zhang, Dingxin Liu, Hao Zhang, Zifeng Wang, Min Chen, Renwu Zhou, Yujing Xu, Han Xu, Dehui Xu, Xiaohua Wang, Mingzhe Rong
Summary: By changing the ambient temperature and discharge power, air discharge plasma can switch between the ozone mode and the NO (x) mode. This study analyzes the properties and effects of air dielectric barrier discharge (DBD) plasma-activated saline (PAS) treated by different discharge modes. The results show that different modes generate varying reactive oxygen species (ROS) and reactive nitrogen species (RNS), with the mixed gases producing the most abundant high-valence RNS and having the strongest anticancer effects.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Xixi Jing, Tong Wu, Dingxin Liu, Hao Zhang, Shengduo Xu, Jishen Zhang, Zifeng Wang, Renwu Zhou, Dehui Xu, Han Xu, Xiaohua Wang, Mingzhe Rong, Yan Zhao
Summary: Plasma-activated hydrogels, specifically PAH, have been found to be superior to PAW in terms of ROS storage, transdermal permeation, and in vitro anticancer effects in an artificial skin model. PAH has a prolonged storage time of ROS and greater transdermal permeation through artificial skin, making it suitable for long-term applications on the skin surface. Additionally, PAH exhibits better anticancer effects, reducing the viability of cancer cells without causing harm to healthy cells. These findings highlight the potential of PAH for subcutaneous anticancer therapies.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Han Xu, Hancheng Xu, Yihong Huang, Zipeng Wei, Hao Zhang, Mingxu Shao, Kai Xie
Summary: We conducted a study on the gas-liquid two-phase flow of air plasma and its associated dynamic behavior, droplet activity, and applications. The presence of water droplets significantly disturbs the propagation of air plasma within a Venturi configuration due to local modifications of the electric field. When the inlet airflow dynamics change from laminar to turbulent, the droplet diameter decreases exponentially, while the gas-droplet contact area increases substantially. This new plasma source architecture enables the activation of water sprays by plasma jets, providing a desirable and effective sterilization tool and wastewater treatment at a relatively low cost and ease of operation.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Applied
Han Xu, Zipeng Wei, Yihong Huang, Hancheng Xu, Bo Li, Hao Zhang, Kai Xie, Mingxu Shao
Summary: Plasma-activated saline (PAS) shows potential in enhancing drug sensitivity in drug-resistant cancer cells by generating reactive oxygen and nitrogen species. In vitro studies demonstrate that the addition of PAS to cell culture medium significantly increases intracellular ROS levels, leading to complete inactivation of cancer cells. The synergistic effects of PAS and anticancer drugs offer a promising option for the future treatment of drug-resistant cancer cells.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Joana Baptista, Jack Shacklock, Muhammad Shaban, Anas Alkayal, Killian Lobato, Upul Wijayantha
Summary: High mass loading electrodes prepared with recovered carbon from catalytic methane cracking showed higher capacitance retention and high-rate capability, making it a potential active material for supercapacitors.
Article
Chemistry, Organic
Yiming Zhao, Fernanda Meloni, Louise Male, Cecile S. Le Duff, William D. G. Brittain, Benjamin R. Buckley, John S. Fossey
Summary: The synthesis of atropisomeric phoshino-triazoles is described. Phosphine introduction at the 5-position of a 1,2,3-triazole ring restricts rotation around a triazole-aryl bond. VT NMR and chiral HPLC studies confirm the conformational stability at high temperatures. Gold(i) chloride complexes of single-enantiomer phosphines also show conformational stability.
ORGANIC CHEMISTRY FRONTIERS
(2023)
