Article
Physics, Fluids & Plasmas
A. Saifutdinov, S. S. Sysoev
Summary: This study investigates the plasma parameters and kinetics of fast electrons in the negative glow region of a discharge with a microhollow cathode at high pressures using a hybrid model. The hybrid model combines a kinetic description of electrons and a fluid description of the heavy plasma component. The results of numerical calculations are compared with probe studies, and it is found that the hybrid model accurately describes the formation of electron energy distribution function peaks. The numerical calculations also allow for the prediction of negative glow plasma parameters in different gas mixtures.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Fluids & Plasmas
S. I. Moshkunov, K. I. Romanov, V. Yu. Khomich, E. A. Shershunova
Summary: This study focuses on investigating the electrical characteristics of a microhollow cathode discharge in air at atmospheric pressure. Experimental results show that the discharge operates in a self-pulsing mode with an average current ranging from hundreds of microamperes to units of milliamperes. It is also observed that the self-pulsing frequency is linearly dependent on the consumed current. Ignition voltage values of the self-pulsing microhollow cathode discharge for different hole diameters (200-500 μm) are obtained.
PLASMA PHYSICS REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Kai Sun, Chong Wang, Jiahong Tian, Zheng Zhang, Ni Zeng, Rui Yin, Wenxin Duan, Qing Hou, Yaman Zhao, Haikun Wu, Runhua Fan
Summary: Magnetic-driven broadband ENZ materials, achieved by fabricating PVA/Ni@CNTs films, exhibit unique physical characteristics and show great potentials in various applications. The film also demonstrates excellent magnetic actuation ability under a magnetic field, expanding its applications to novel fields.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Multidisciplinary
Qi Bing, Tian Xiao, Wang Jing, Wang Yi-Shan, Si Jin-Hai, Tang Jie
Summary: This study presents the mechanism of dielectric barrier discharge (DBD) of argon (Ar) plasma driven by a combination of radio frequency (rf) and direct current (dc) voltages at atmospheric pressure. The results show that the introduction of dc voltage has a significant effect on the rf discharge process and changes the parameters of the plasma state. The discharge process is mainly controlled by the air gap voltage, which is affected by the dc voltage through changing the charge density on the dielectric surface.
ACTA PHYSICA SINICA
(2022)
Article
Chemistry, Physical
Sen Li, Jiazhen Sun, Rui Sun, Jie Pan, Lin Wang, Chen Chen, Qiang Chen, Zhongwei Liu
Summary: In this study, the characteristics of radio frequency dielectric barrier discharge (RF-DBD) using argon doped with nitrogen at atmospheric pressure were investigated. It was found that the discharge changed from glow discharge to filamentous discharge as the voltage increased, with the morphology of the filaments depending on the nitrogen doping ratio.
Article
Chemistry, Multidisciplinary
Qianhan Han, Ying Guo, Yarong Zhang, Jing Zhang, Jianjun Shi
Summary: In this experimental study, a plasma plume generated by radio frequency atmospheric pressure glow discharge was enhanced in terms of length and intensity by pulsed discharge. The enhanced plume was used to improve the O/C ratio of carbon fiber.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
I. A. Sorokin, D. V. Kolodko
Summary: This article studies a planar hollow cathode discharge (HCD) system with an asymmetric negative potential applied to parallel cathodes. It is found that the hollow cathode effect can be preserved when an additional high voltage bias is applied to one of the cathodes. The performance of the HCD system under different argon pressures was investigated by measuring the current-voltage characteristics of the iron cathode/target. In addition, the iron deposition rate in a sputtering system based on the HCD was studied under different conditions.
Article
Chemistry, Multidisciplinary
Hiroaki Kobayashi, Yu Fukumi, Hiroto Watanabe, Reona Iimura, Naomi Nishimura, Toshihiko Mandai, Yoichi Tominaga, Masanobu Nakayama, Tetsu Ichitsubo, Itaru Honma, Hiroaki Imai
Summary: Ultraporous and ultrasmall cubic spinel MgMn2O4 (MMO) is fabricated through a freeze-dry assisted room-temperature alcohol reduction process. Heat-treatment removes surface hydroxy groups and activates MMO, increasing its discharge capacity from 160 mAh g(-1) to 270 mAh g(-1), close to the theoretical value. The ultraporous, ultrasmall particles stabilize the metastable cubic spinel phase, promoting Mg2+ insertion/deintercalation and reversible transformation between cubic spinel and cubic rock-salt phases.
Article
Chemistry, Physical
Junqiang Xu, Yalin Liu, Huan Tian, Qiang Zhang, Wuyi Cao, Kaipeng Chen, Fang Guo
Summary: This study developed a catalyst with excellent performance by combining P123 addition and RF plasma treatment, which effectively improved the coke resistance of the catalyst and the stability of CH4/CO2 reforming.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Fluids & Plasmas
Elena Kralkina, Polina Nekludova, Aleksander Nikonov, Konstantin Vavilin, Ilya Zadiriev, Vladimir Tarakanov
Summary: Systematic experimental studies and numerical modeling were conducted to investigate the electron density, temperature, and RF power coupling efficiency in RF inductive discharge plasma at different gas pressures. The results show that the maximum electron density and minimum temperature are achieved within a certain pressure range.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Xu-Cheng Wang, Shu-Han Gao, Yuan-Tao Zhang
Summary: By studying the effects of driving frequency on RF CO2 discharges under Martian pressure, this research reveals that adjusting the driving frequency can enhance the conversion and energy efficiency of CO2, reducing carbon dioxide emissions. It also offers insights into the frequency effects on plasma chemistry and lays the foundation for optimized CO2 decomposition methods on Mars.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Physics, Multidisciplinary
Ya-Rong Zhang, Qian-Han Han, Jun-Lin Fang, Ying Guo, Jian-Jun Shi
Summary: A cascade glow discharge in atmospheric helium was excited by a microsecond voltage pulse and a pulse-modulated RF voltage. The ignition dynamics of the RF discharge burst were investigated experimentally, including the spatio-temporal evolution of the discharge, ignition time, and optical emission intensities of plasma species. The results showed that increasing the time interval between the pulsed discharge and RF discharge burst led to an increase in ignition time and changes in the discharge spatial profile.
Article
Instruments & Instrumentation
Dheeraj K. Singh, B. Dikshit, Jaya Mukherjee, V. S. Rawat
Summary: Electrode geometry has a significant impact on metal vapor laser performance. Modifying the electrode geometry can reduce the electric field enhancement. Replacing the eight-pin electrode with a zero-pin configuration leads to a decrease in phantom current and an increase in optical output power. Reduction in field enhancement improves discharge stability and jitter by reducing thermal loading and thermal instability probability.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Automation & Control Systems
Zi-Lun Li, Xue-Cheng Xi, Hao-Yu Chu, Ling-Yi Xu, Qiang Gao, Wan-Sheng Zhao
Summary: This study proposes to monitor gap discharge states using radio frequency signals, aiming to provide more accurate feedback signals and achieve better machining performance, with a substantial improvement in the classification accuracy of discharge pulses observed in experiments. The material removal rate is increased by about 10% in roughing, and there is a slight improvement in surface quality.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Pavel Smirnov, Ruslan Kozakov, Jochen Schein
Summary: A novel design of a neutralizer-free plasma thruster is proposed, utilizing RF discharge for plasma generation and a magnetic nozzle configuration for acceleration. The characteristics of plasma plume and ions flux are investigated, and key parameters such as ions energy, flux, efficiencies, and thrust are estimated. The system produces an ion beam accelerated to 10 eV with power levels of 20 W and a mass flow of 1.2 mg/s, showing the acceleration due to the formation of an ambipolar electric field. Comparisons with other similar thrusters are also conducted.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Fluids & Plasmas
M. J. E. Casey, P. W. Stokes, D. G. Cocks, D. Bosnjakovic, I Simonovic, M. J. Brunger, S. Dujko, Z. Lj Petrovic, R. E. Robson, R. D. White
Summary: This paper discusses the analysis of transport properties in the pulsed-Townsend experiment, revealing flaws in the traditional Brambring representation. A re-analysis method based on the standard diffusion equation and a representation of universal bulk transport coefficients are presented.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Optics
Zoran Lj Petrovic, Olivera Sasic, Snjezana Dupljanin, Paul Maguire
Summary: In this paper, a set of cross sections for electron collisions with DME is discussed and analyzed using experimental data. The derived data can be used for modeling DC and RF discharges and plasma applications containing pure DME and its mixtures.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Optics
Andrea Jurov, Nikola Skoro, Kosta Spasic, Martina Modic, Natasa Hojnik, Danijela Vujosevic, Milena Durovic, Zoran Lj Petrovic, Uros Cvelbar
Summary: Atmospheric pressure plasmas are being studied for their effects on microbial deactivation. The research focuses on optimizing the parameters of atmospheric pressure plasma jet (APPJ) to deactivate different bacteria strains in a medium. Diagnostic methods such as optical and electrical plasma jet diagnostics were used to understand the properties of plasma and the connection between reactive species in the gas and liquid phases. The study found that higher discharge powers and gas flow rates were more efficient in deactivating bacteria.
EUROPEAN PHYSICAL JOURNAL D
(2022)
Article
Physics, Fluids & Plasmas
I Simonovic, D. Bosnjakovic, Z. Lj Petrovic, R. D. White, S. Dujko
Summary: Using a multi-term solution of the Boltzmann equation and Monte Carlo simulation, this study investigates the behavior of third-order transport coefficients for electrons in model gases and real gases. Negative values are observed in certain cases, and the accuracy of approximation methods is also examined. The influence of electron attachment and ionization on the transport tensor is analyzed, and the contribution of the third-order transport tensor to the swarm's spatial profile is investigated.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Dejan Maletic, Dean Popovic, Nevena Puac, Zoran Lj Petrovic, Slobodan Milosevic
Summary: This paper compares the fast Intensified Charge Coupled Device (ICCD) imaging with the newly developed diagnostic method of laser induced breakdown in plasma jet. The results show that laser induced breakdown spectroscopy can be used as a complementary diagnostics technique with ICCD measurements.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Tahereh Shah Mansouri, Hui Wang, Davide Mariotti, Paul Maguire
Summary: This study used optical emission spectroscopy and partial least squares-discriminant analysis to detect trace concentrations of methane gas. By enhancing the algorithms, the dimensionality and collinearity of the spectral emission data were addressed, leading to improved predictive performance.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ruairi J. McGlynn, Hussein S. Moghaieb, Paul Brunet, Supriya Chakrabarti, Paul Maguire, Davide Mariotti
Summary: Macroscopic ribbons of carbon nanotubes were functionalised using a plasma-liquid system, resulting in improved wettability and stability of the nanofluids. The treated nanofluids showed enhanced performance in solar-thermal harvesting, with higher absorption coefficient and improved thermal profile.
Article
Physics, Fluids & Plasmas
Jonathan Tennyson, Sebastian Mohr, M. Hanicinec, Anna Dzarasova, Carrick Smith, Sarah Waddington, Bingqing Liu, Luis L. Alves, Klaus Bartschat, Annemie Bogaerts, Sebastian U. Engelmann, Timo Gans, Andrew R. Gibson, Satoshi Hamaguchi, Kathryn R. Hamilton, Christian Hill, Deborah O'Connell, Shahid Rauf, Kevin van 't Veer, Oleg Zatsarinny
Summary: The Quantemol database is a valuable resource for plasma models, providing cross sections and rates of important processes. It includes data on heavy particle collisions, electron collision processes, and surface processes. Users can access the data through a web interface or application program interface and use it in popular plasma modeling codes.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Helen L. Davies, Vasco Guerra, Marjan van der Woude, Timo Gans, Deborah O'Connell, Andrew R. Gibson
Summary: Characterisation of vibrational kinetics in nitrogen-based plasmas at atmospheric pressure is crucial for various applications. A 0-dimensional plasma chemical-kinetics model was used to study vibrational kinetics in pulsed atmospheric pressure plasmas operating in pure nitrogen. The simulations show that the production of vibrationally excited states is dominated by electron-impact processes at lower powers, but switches to vibrational energy transfer processes at higher powers, resulting in significant increase in the population of vibrational levels.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Fluids & Plasmas
H. N. McQuaid, D. Rutherford, D. Mariotti, P. D. Maguire
Summary: We have developed a gas-based OH generation source using a low power radio frequency driven plasma. This source delivers OH radicals away from interference and has been found to vary with H2O vapour content and absorbed power density. The OH flux generated has been compared to traditional OH generation techniques and shows promising results for various scientific and technological applications.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Review
Physics, Fluids & Plasmas
Luis L. Alves, Markus M. Becker, Jan van Dijk, Timo Gans, David B. Go, Katharina Stapelmann, Jonathan Tennyson, Miles M. Turner, Mark J. Kushner
Summary: The field of low-temperature plasmas (LTPs) excels by its intellectual diversity, interdisciplinarity, and range of applications. Communication challenges arise due to diverse reporting practices and expectations. This paper addresses these challenges by discussing standards for measurements, diagnostics, computations, reporting, and plasma sources to improve communication and transparency within the LTP field.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Review
Chemistry, Multidisciplinary
Hussein Sayed Moghaieb, Vincenzo Amendola, Sameh Khalil, Supriya Chakrabarti, Paul Maguire, Davide Mariotti
Summary: This review discusses recent developments in the field of nanofluids utilized in direct-absorption solar collectors, including preparation techniques, optical behaviors, solar thermal energy conversion performance, as well as physical and thermal stability. The challenges associated with the practical implementation of nanofluid-based direct-absorption solar collectors are also highlighted, along with suggestions and an outlook for the future.
Article
Nanoscience & Nanotechnology
Slavia Deeksha Dsouza, Marius Buerkle, Bruno Alessi, Paul Brunet, Alessio Morelli, Amir Farokh Payam, Paul Maguire, Davide Mariotti, Vladimir Svrcek
Summary: Nitrogen-doped graphite quantum dots prepared by atmospheric pressure microplasma exhibit high stability and environmentally friendly properties. They emit blue light and are suitable for cellular imaging or optoelectronics applications.
Article
Chemistry, Physical
Ruairi Mcglynn, Paul Brunet, Supriya Chakrabarti, Abhijit Ganguly, Hussein Moghaieb, Zheng Bo, Paul Maguire, Davide Mariotti
Summary: An atmospheric-pressure plasma system is developed to treat carbon nanotube assemblies and produce a hybrid carbon-zinc structure. This system enables continuous and single-step production of nano-composite materials, improving material uniformity through the use of metal-based coating and carbon nanotube synthesis.
Article
Chemistry, Multidisciplinary
Calum McDonald, Chengsheng Ni, Vladimir Svrcek, Manuel Macias-Montero, Tamilselvan Velusamy, Paul A. Connor, Paul Maguire, John T. S. Irvine, Davide Mariotti
Summary: Sr0.9NbO3 exhibits metallic behaviour and high conductivity, with broad absorption across the ultraviolet, visible, and near-infrared spectral regions, making it an attractive material for solar energy conversion. The optoelectronic properties of strontium niobate can be easily tuned by varying the Sr fraction or through doping. It has been found that Sr-deficient strontium niobate exhibits a split conduction band, enabling two types of optical transitions.
