Article
Physics, Multidisciplinary
Xijian Xiao, Jidun Wu, Qilu Cao, Xiaojiang Huang
Summary: This study developed an electrode integrated with a hollow cathode (HC) and capacitively coupled plasma (CCP) for processing material surfaces at the nanometer scale. The novel capacitively coupled plasma driven by hollow cathode radio-frequency discharges (HC-CCP) was observed experimentally, and its properties in the center of the chamber were investigated. The results showed that the HC-CCP exhibited wide ranges of electron density (n(e)) and electron energy (T(e)), which could be controlled by adjusting various parameters. This plasma source has potential applications in the next generation of material processing.
Article
Physics, Fluids & Plasmas
Zhengchao Duan, Peizhen Li, Feng He, Ruoyu Han, Jiting Ouyang
Summary: This paper investigated the helium plasma jet generated by micro-hollow cathode discharge (MHCD) and analyzed the influences of gas flow rate on the jet propagation process. The results showed that the electric field plays an important role in the propagation of the jet during the first stage.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
S. N. Andreev, A. V. Bernatskiy, V. N. Ochkin
Summary: A multichannel scheme and technique have been developed to simultaneously measure the parameters of electrons in a discharge plasma in a hollow cathode using multiple Langmuir probes in different regions. In the implemented system, the current-voltage characteristics of the probes are formed by combinations of noise and periodic voltage waveforms, ensuring high dynamic range and accuracy of measurement results. The system can determine the electron energy distribution functions, average energies, plasma potentials, and electron concentrations simultaneously in different regions of the plasma space. Experimental results show the need for special processing of the probes to obtain consistent data, as their states change over time. Additionally, the effect of probe location on the measured values is discussed.
Article
Materials Science, Coatings & Films
Santiago Dominguez-Meister, Inigo Ibanez, Anastasia Dianova, Marta Brizuela, Inigo Braceras
Summary: Nitriding processes can enhance the properties of titanium surfaces, with hollow cathode assisted active screen plasma proving to be an effective and fast technique. The study investigates the impact of process parameters on the surface microstructure, finishing, and hardness of titanium. Results show that nitriding can produce titanium nitride surfaces with thicknesses exceeding those of PVD coatings, and monitoring electrical contact resistance can provide valuable information on surface status evolution.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
S. N. Andreev, A. Bernatskiy, N. A. Dyatko, I. Kochetov, V. N. Ochkin
Summary: Experimental and theoretical studies have been conducted on the electron energy distribution function in hollow cathode discharge plasma. It was found that under these conditions, low-energy electrons are significantly depleted, mainly due to electron absorption by the anode in close proximity.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Himanshu Mishra, Milan Tichy, Pavel Kudrna
Summary: Optical emission spectroscopy (OES) is a non-intrusive and versatile method for determining plasma parameters, such as electron temperature and electron density, in low-pressure discharge systems. In this study, the modified Boltzmann equation and line intensity ratios were used to calculate these plasma parameters in a low-pressure hollow cathode plasma jet (HC) and planar magnetron cathode system (PM) under continuous DC and pulsed-DC regimes. The results provide insights into the dependencies of electron temperature and electron density on applied power and argon flow rate in these two systems.
Article
Chemistry, Inorganic & Nuclear
Tingting Jiang, Mihong Cao, Jun Chen, Luyi Wang, Qian Zhang, Hua Wang, Jintian Luo
Summary: Novel carbon skeleton materials were prepared by high-temperature carbonization of rare earth phthalocyanines (MPcs) (M = Yb, La). The resulting carbon materials have a graphite-layered structure, smaller particle size, larger specific surface area, and higher degree of hard carbonization. Batteries using these carbon materials as electrodes exhibit excellent energy storage behaviors.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Chemical
A. V. Bernatskiy, I. I. Draganov, N. A. Dyatko, I. V. Kochetov, V. N. Ochkin
Summary: For the first time, the spatial distribution of electron density in the plasma region between the hollow cathode edge and the grid anode, without the confinement of side walls, has been measured. The measurements were conducted in a helium discharge at 1.5 mbar using an original system for positioning Langmuir probes in space. The impact of the cylindrical probe radius on the measurement results of plasma electron component parameters was investigated, along with the combined influence of plasma's finite resistance and the electron absorption effect on the probe.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2023)
Article
Physics, Fluids & Plasmas
Jiaxin LI, Zhengchao Duan, Feng He, Ruoyu Han, Jiting Ouyang
Summary: Helium plasma jets generated by micro-hollow cathode discharge (MHCD) with the square-wave power source of different polarities are investigated. The effects of positive and negative polarity pulses on the MHCD and plasma jet were compared, and the time-resolved optical emission spectra of excited species (N-2(+) and O) were studied. The results confirm that the electric field is a key factor for the propagation of the jet during the rising edge of the positive current pulse, while the gas expansion is mainly important for the jet propagation during the current stable phase. The time-resolved spectra show that the generation of specie O in the jet-driven by the electric field is more efficient.
PLASMA SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Fluids & Plasmas
Rainer Hippler, Martin Cada, Zdenek Hubicka
Summary: By using a positively biased external ring anode in combination with a hollow cathode discharge or a magnetron sputtering discharge, both with a Ti cathode and with Ar as working gas, the kinetic energy of argon and titanium ions can be enhanced, allowing for effective energy control of plasma ions.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Maciej Spychalski, E. Fortuna-Zalesna, Joanna Zdunek, Marek Rubel, Anna Widdowson, Spyridon Aleiferis, Beth Thomas
Summary: Tungsten Langmuir probes retrieved from the JET tokamak with the ITER-Like Wall (JET-ILW) after the second ILW campaign were examined by nano-indentation, microscopy and x-ray diffraction to determine changes in mechanical properties and phase composition. The probes showed significant differences in hardness between the tip and support structure, while the Young's modulus values were similar. The material in the tip has a smaller range of elastic deformations compared to that of the support structure.
Article
Physics, Fluids & Plasmas
A. Saifutdinov, S. S. Sysoev
Summary: Covering the external surface of the cathode improves the current-voltage characteristics of microhollow cathode discharges, allowing the negative glow plasma to occupy more of the discharge volume for better resolution in recording fast electron spectra.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Yajia Bai, Yixuan Wang, Song Chen, Hao Li, Jianan Zhang, Xiaona Li, Weiyi Chen, Toshiyuki Ikoma, Akiyoshi Osaka
Summary: Nanofibrous and hollow titania nanowire (NH-TiNW) microspheres were synthesized by alkali hydrothermal treatment of hollow titania (H-Ti) microspheres, and their microstructure, biocompatibility, and drug delivery property were evaluated. NH-TiNW microspheres exhibited a nanofibrous and hollow structure, enhancing cell attachment and proliferation compared to H-Ti microspheres. Additionally, NH-TiNW microspheres showed strong adsorption of tetracycline hydrochloride and maintained the biological efficiency of the loaded drugs in inhibiting bacterial growth.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Wahyudiono, Hiroki Kondo, Siti Machmudah, Hideki Kanda, Yaping Zhao, Motonobu Goto
Summary: The study demonstrated the utilization of an electric field generated by high voltage discharge plasma over a liquid water surface containing glycine compound to synthesize TiO2 nanoparticles. The applied voltages, pulse numbers, and repetition rates significantly influenced the decomposition reaction of glycine compounds and electrode erosion. The UV-vis spectra and HRTEM images confirmed the formation of TiO2 nanoparticles and TiC as nanoparticle products, suggesting that this process has potential for advanced nanoparticle synthesis technology.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Physics, Fluids & Plasmas
D. Voloshin, T. Rakhimova, A. Kropotkin, I Amirov, M. Izyumov, D. Lopaev, A. Zotovich, S. Ziryanov
Summary: In this study, numerical and analytical approaches for determining plasma density are validated using hairpin probe measurements. The experiments were conducted on an argon inductively coupled plasma discharge system, with pressure ranging from 4.5 mTorr to 27 mTorr and input power varying from 200 to 800 W. The results show that different models have different relative errors, and taking ion collisions into account is necessary for obtaining reliable plasma density values.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
R. Vladoiu, A. Mandes, V Dinca, G. Prodan, P. Kudrna, M. Tichy
Review
Materials Science, Multidisciplinary
Rodica Vladoiu, Milan Tichy, Aurelia Mandes, Virginia Dinca, Pavel Kudrna
Article
Chemistry, Physical
Kostyantyn Tuharin, Zdenek Turek, Michal Zanaska, Pavel Kudrna, Milan Tichy
Article
Materials Science, Multidisciplinary
Z. Hubicka, M. Cada, A. Kapran, J. Olejnicek, P. Ksiroya, M. Zanaska, P. Adamek, M. Tichy
Article
Physics, Fluids & Plasmas
J. Adamek, D. Cipciar, A. Devitre, J. Horacek, J. Cavalier, M. Komm, J. Krbec, M. Tichy, D. Trunec, P. Bohm, R. Panek
Summary: This study presents a unique method for fast ion temperature measurements in the tokamak edge plasma, using a ball-pen probe to scan and fit the electron branch of the I-V characteristic. Experiments on the COMPASS tokamak showed a nearly flat ion temperature profile with a ratio of ion to electron temperature close to 1-2 during L-mode discharges.
Article
Chemistry, Inorganic & Nuclear
Jan Wild, Peter Pira, Tomas Burian, Ludek Vysin, Libor Juha, Zdenek Zelinger, Stanislav Danis, Vaclav Nehasil, Zdenek Rafaj, Vaclav Nevrly, Michal Dostal, Petr Bitala, Pavel Kudrna, Milan Tichy, Jorge J. Rocca
Article
Chemistry, Physical
R. Vladoiu, A. Mandes, V Dinca, P. Kudrna, M. Tichy, S. Polosan
Summary: The Laser-induced Thermionic Vacuum Arc method was used to optimize magnesium-silver alloys, improving their electrical conductivity and stability while avoiding the issue of magnesium oxidation. This method has the potential to be used as stable metallic cathodes for optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Himanshu Mishra, Milan Tichy, Pavel Kudrna
Summary: Optical emission spectroscopy (OES) is a non-intrusive and versatile method for determining plasma parameters, such as electron temperature and electron density, in low-pressure discharge systems. In this study, the modified Boltzmann equation and line intensity ratios were used to calculate these plasma parameters in a low-pressure hollow cathode plasma jet (HC) and planar magnetron cathode system (PM) under continuous DC and pulsed-DC regimes. The results provide insights into the dependencies of electron temperature and electron density on applied power and argon flow rate in these two systems.
Proceedings Paper
Chemistry, Multidisciplinary
Vyacheslav F. Myshkin, Valeriy A. Khan, Milan Tichy, Anna Kapran, Dmitriy A. Izhoykin, Vladimir N. Lenskiy, Denis L. Gamov, Darya A. Leonteva
V INTERNATIONAL CONFERENCE FOR YOUNG SCIENTISTS, POST-GRADUATE STUDENTS AND STUDENTS ISOTOPES: TECHNOLOGIES, MATERIALS AND APPLICATION (ITMA-2018)
(2019)
Proceedings Paper
Chemistry, Multidisciplinary
Vyacheslav F. Myshkin, Valeriy A. Khan, Milan Tichy, Anna Kapran, Valentin A. Borisov, Denis L. Gamov, Ilya Ju Zaguzin
V INTERNATIONAL CONFERENCE FOR YOUNG SCIENTISTS, POST-GRADUATE STUDENTS AND STUDENTS ISOTOPES: TECHNOLOGIES, MATERIALS AND APPLICATION (ITMA-2018)
(2019)
