Article
Spectroscopy
Nikola Ivanovic, Nikodin Nedic, Ivan R. Videnovic, Dj. Spasojevic, Nikola Konjevic
Summary: We studied the emission spectra of Ne I 503.775 nm and Ne I 508.038 nm atomic lines in two different DC glow discharge sources. Our modified discharge source allows recording of complex line shapes from two optical directions, enabling spatially resolved Stark polarization spectroscopy. The observed correlation between the electric field strength in the cathode sheath and the recorded spectral shifts provides insights into the cathode sheath parameters.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2023)
Article
Physics, Applied
Karna Patel, Anup Saha, Tanbo Zhou, Terrence R. Meyer, Sally Bane, Aman Satija
Summary: This study investigates the temporal dynamics of atmospheric-pressure nanosecond pulsed plasma discharges in a pin-to-pin electrode configuration using streak-camera line imaging. The discharge emission starts uniformly throughout the interelectrode gap and then decays in two distinct phases. The plasma emission in air and N-2 environments shows significant differences in their temporal dynamics. The formation and relaxation timescales of electronically excited states of N-2 are quantified with sub-nanosecond resolution. The streak-OES technique allows for quantitative time-resolved studies of key chemical species in ultra-short-pulsed plasmas.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Fluids & Plasmas
A. Walsten, K. Xu, C. Sanderson, C. Ballmann, D. Matyas
Summary: The study showed that adjusting the external electric field, frequency, and gas mixture ratio can control the timing and intensity of nanosecond pulsed atmospheric pressure dielectric barrier glow discharge in helium with 1% of argon.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Fluids & Plasmas
A. Saifutdinov
Summary: In this study, various modes of direct current discharges in argon at atmospheric pressure were investigated based on a unified model for describing the gas discharge gap and electrodes in 2D geometry. Numerical calculations were conducted to reveal the influence of electrode cooling conditions on the current-voltage characteristic of the discharge, including the transition from normal glow to arc discharge and the occurrence of abnormal glow mode. Different forms of arc discharge, either with diffuse or contracted current spot, were observed depending on the cooling conditions. Low-current mode exhibited current and voltage oscillations during the transition from Townsend to normal glow discharge.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Yury D. Korolev, Nikolay V. Landl, Oleg B. Frants, Vladimir G. Geyman, Grigoriy A. Argunov, Pavel V. Logachev, Petr A. Bak, Alexander V. Akimov
Summary: This article describes the modified version of a commercially produced pseudospark switch and its testing results, which aimed to achieve nanosecond triggering stability for multiple switches connected in parallel to a common load. The results showed that the modified switch had low triggering delay time and jitter.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Computer Science, Information Systems
Michelangelo Balmelli, Yang Lu, Raphael Farber, Laura Merotto, Patrik Soltic, Davide Bleiner, Jurgen Biela, Christian M. Franck
Summary: This study experimentally investigated the electrical breakdown of synthetic air under ultrashort high-voltage pulses and slowly increasing voltages. The results highlight the significant role of seed electron provision in breakdown under short transient voltages. Additionally, the influence of electrode material and UV illumination on the breakdown phenomenon was studied.
Article
Biochemistry & Molecular Biology
Hayato Tada, Satoshi Uehara, Chia-Hsing Chang, Ken-ichi Yano, Takehiko Sato
Summary: It is discovered that nanosecond pulsed currents can elongate cells without affecting their direction of elongation and migration. The behavior of cells is also found to change depending on the conditions of current application.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Physics, Applied
N. D. Lepikhin, D. Luggenhoelscher, U. Czarnetzki
Summary: The study investigates the electric field in the He:N-2 nanosecond atmospheric pressure plasma jet using the electric-field induced second harmonic generation technique. It suggests calibrating with nanosecond high voltage pulses instead of DC voltage, and observes an electric field profile structure similar to streamers or ionization fronts, confirming the validity of the local field approximation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Green & Sustainable Science & Technology
Nan Jiang, Xiaoqi Kong, Xiaoling Lu, Bangfa Peng, Zhengyan Liu, Jie Li, Kefeng Shang, Na Lu, Yan Wu
Summary: This study focuses on the investigation of a nanosecond pulsed sliding dielectric barrier discharge (SLDBD) and its application in degrading a chlorinated VOC. The research reveals that the propagation of surface streamers is greatly influenced by the negative DC voltage applied, leading to an increase in the production of excited species and improved degradation efficiency.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Physics, Applied
Vyaas Gururajan, Riccardo Scarcelli
Summary: This study develops a model to explain the ignition process of non-equilibrium plasma discharges in lean and dilute combustion environments, with emphasis on the energy delivered from the circuit to the cylinder. By summarizing, simplifying, and systematically coupling key physics and chemistry parameters, and modeling them using Modelica, the study finds that the energy delivery characteristics of such discharges have important implications for ignition.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Aerospace
Sangjun Ahn, Jeongheon Chae, Hyung-Jin Kim, Kyu Hong Kim
Summary: Two-dimensional numerical simulations were conducted to study nanosecond pulsed single dielectric barrier discharge (SDBD) in air. The simulation revealed non-equilibrium effects of electrons, strong electric fields, and high-density gradients of charged particles in the streamer discharge. The results provide insights into the physics of discharge and confirm the presence of non-equilibrium effects in the streamer head and sheath due to locally large electric field gradients.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2021)
Article
Engineering, Aerospace
Djordje Spasojevic, Nikola V. Ivanovic, Nikodin V. Nedic, Luka Rajacic, Nikola M. Sisovic, Nikola Konjevic
Summary: We present experimental and theoretical study on the complex UV line shapes of Ne II 369.421 nm, Ne II 370.962 nm, Ne II 371.308 nm, and Ne II 372.711 nm lines in the cathode sheath region of an abnormal DC glow discharge in pure neon. Two sets of experimental profiles and electric field distributions were obtained for discharge with tungsten and titanium cathodes, and theoretically studied using an iterative CS kinetic model. Our theoretical model allows determination of important CS parameters, such as the thickness of the CS region, and accurate theoretical predictions of the observed line profiles.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Energy & Fuels
Joohan Kim, Vyaas Gururajan, Riccardo Scarcelli, Sayan Biswas, Isaac Ekoto
Summary: Dilute combustion is a promising strategy to improve the thermal efficiency of internal combustion engines, but it poses challenges for ignitability and combustion stability. This study proposes an advanced approach to model spark-ignition energy deposition and flame kernel growth.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Physics, Fluids & Plasmas
Colin A. Pavan, Carmen Guerra-Garcia
Summary: This study investigates the interaction between a nanosecond repetitively pulsed dielectric barrier discharge and a transient laminar flame. It reveals that the hot combustion products have a significant impact on the discharge. The pulse repetition frequency and the cooling rate of the combustion products determine the transition between uniform and filamentary discharge regimes, with no noticeable influence from the reduced electric field. These findings highlight the importance of considering the changes in discharge properties due to combustion processes in plasma-assisted transient combustion systems.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Shoki Abe, Katsuyuki Takahashi, Seiji Mukaigawa, Koichi Takaki, Ken Yukimura
Summary: Experimental evaluation of a high-power pulsed sputtering (HPPS) discharge source as an ion source for droplet-free plasma processes showed higher current density and ion density compared to a traditional hollow-cathode discharge (HCD) source.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Review
Physics, Applied
Shinya Kumagai, Chikako Nishigori, Tetsuya Takeuchi, Peter Bruggeman, Keisuke Takashima, Hideki Takahashi, Toshiro Kaneko, Eun Ha Choi, Kazuo Nakazato, Makoto Kambara, Kenji Ishikawa
Summary: This review provides insight on state-of-the-art potential technologies for the prevention and prediction of infectious diseases, and surveys virus sterilization methods using ultraviolet light and low temperature plasma technologies. Researchers in various fields are facing challenges posed by infectious diseases, and advancements in nanomaterials and biomedical diagnostics are also evaluated.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Manikandan Suresh, V. S. Santosh K. Kondeti, Peter J. Bruggeman
Summary: The interaction between cold atmospheric pressure plasma jets and hydrogels has been used as a model system for studying the interaction between plasmas and tissues. In this study, the diffusion of reactive oxygen species, particularly H2O2, and the amount of plasma-produced H2O2 that penetrates into a gelatin hydrogel were analyzed. It was found that the diffusion constant of H2O2 in 10% gelatin hydrogel is similar to its diffusion constant in water, and the production of H2O2 in the hydrogel is significantly reduced compared to the production in distilled water under the same plasma operation conditions, suggesting that the scavenging of OH radicals at the plasma-gel interface greatly reduces H2O2 production.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Yudong Li, Jingkai Jiang, Michael Hinshelwood, Shiqiang Zhang, Peter J. Bruggeman, Gottlieb S. Oehrlein
Summary: This work investigated the mechanism of atmospheric pressure plasma jet (APPJ)-assisted methane oxidation. Analysis of gas phase, surface, and plasma-produced species revealed the essential role of oxygen atoms and observed a synergistic effect of 30%. Surface analysis of the catalyst showed the adsorption of CH (n) as an intermediate species, which subsequently transformed into surface CO. For a nickel catalyst at 500 degrees C, the dissociation of CH4 to CH (n) may be the rate-determining step in the plasma-assisted CH4 oxidation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Jingkai Jiang, V. S. Santosh K. Kondeti, Gaurav Nayak, Peter J. Bruggeman
Summary: This study presents a detailed comparison between modeling and experimental results to elucidate the plasma chemistry in a humid atmospheric pressure plasma jet. It is found that there is a significant difference in the measured concentration of H due to boundary layer effects. Additionally, the model underestimates the concentration of H and O-2, and overestimates the concentration of H2O2. These findings provide insights into the H2O vapor chemistry in low-temperature plasmas.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Yuanfu Yue, V. S. Santosh K. Kondeti, Nader Sadeghi, Peter J. Bruggeman
Summary: This work investigates the impact of the interaction between positive pulsed DC atmospheric pressure plasma jet with He-0.1% H2O mixture and liquid cathode on the plasma morphology and OH generation. The results show that plasma instabilities and enhanced evaporation have a significant influence on the OH generation. At higher plasma energies, the plasma contracts due to thermal instability, leading to a decrease in OH density in the core, while at lower plasma energies, the instability is suppressed by the equivalent series resistor of the liquid electrode.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Thermodynamics
Yong Tang, Qiang Yao, Marien Simeni Simeni, Igor V. Adamovich
Summary: This study investigates the response of counterflow diffusion flames to sub-breakdown DC and AC electric fields, as well as their superposition with ns pulse discharge waveforms in the plane-to-plane electrode geometry. The results show that sub-breakdown DC and low-frequency AC electric fields displace the flame towards the grounded electrode. However, as the AC frequency increases, the flame response becomes less pronounced. Combining a nanosecond pulse discharge with a sub-breakdown DC field generates a diffuse plasma across the entire gap. The rapid plasma self-shielding in the plane-to-plane geometry prevents the detectable flame displacement enhancement observed in other electrode geometries.
COMBUSTION AND FLAME
(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
Tanubhav Srivastava, Marien Simeni Simeni, Gaurav Nayak, Peter J. Bruggeman
Summary: This study investigated self-organization at the plasma-liquid anode interface, revealing significant impacts of factors such as electrode gap distance, solute, and gas composition on pattern formation. A key underlying mechanism was proposed to explain all experimentally observed trends.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Seshagiri R. Nandula, Vighneswara S. S. K. Kondeti, Chi Phan, Jianan Wang, Mitchell R. Penningroth, Jennifer L. Granick, Peter J. Bruggeman, Ryan C. Hunter
Summary: Microbial biofilms are resistant to antimicrobials, but cold atmospheric plasmas (CAP) show promise as a biofilm remediation strategy. This study evaluated the impact of treatment modality on biofilm inactivation and demonstrated the efficacy of CAP over conventional antimicrobials.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Physics, Fluids & Plasmas
Yuanfu Yue, Peter J. Bruggeman
Summary: Plasma driven solution electrochemistry has attracted attention for various applications, including nanomaterial synthesis. This study investigated the electron density and temperature of a negative pulsed DC discharge in helium with N-2 shielding gas using Thomson scattering spectroscopy. The results showed stable radial plasma contraction and plasma-enhanced N-2 mixing. It was also observed that the plasma enhanced N-2 mixing significantly affected the plasma morphology and electron properties. The increase in electron temperature near the anode surface suggested the presence of hot electrons and their potential role in non-equilibrium electron-driven reactions in the liquid phase.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Mackenzie Meyer, Gaurav Nayak, Peter J. Bruggeman, Mark J. Kushner
Summary: Plasmas in contact with liquids can degrade organic molecules through the solvation of reactive oxygen and nitrogen species. Immersing small droplets in the plasma can rapidly activate the liquid. The interaction between a glow discharge and a water droplet containing formate in the plasma was modeled using a global plasma chemistry model.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Applied
Gaurav Nayak, Jianan Wang, Rui Li, Diana Aranzales, Selma Mededovic Thagard, Peter J. J. Bruggeman
Summary: Water microdroplets containing organic and fluorinated compounds were exposed to a radiofrequency glow discharge plasma, resulting in significant decomposition of formate and perfluorooctanoic acid, but no significant effect on triflic acid. In situ measurements confirmed that the conversion was independent of the OH flux to the droplet. Control experiments suggest that vacuum UV photons play a significant role in the decomposition process and can explain unexpected trends.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Physics, Fluids & Plasmas
Gaurav Nayak, Mackenzie Meyer, Gaku Oinuma, Mark J. Kushner, Peter J. Bruggeman
Summary: This paper investigates the charging of particles with diameters of tens of microns at atmospheric pressure, with a focus on ambipolar charging. The study of ambipolar charging in atmospheric pressure plasmas, specifically of droplets, has not been extensively explored. The activation of droplets in plasmas is of interest for various applications such as water purification, fertilizer production, and materials synthesis. The transport dynamics of water droplets through an atmospheric pressure radiofrequency glow discharge sustained in helium are studied. The differential charging of droplets in the plasma gradients of the bounding sheaths is found to be responsible for the transport dynamics.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Instruments & Instrumentation
M. Simeni Simeni, A. S. Davies, A. Diallo
Summary: We demonstrate the feasibility of streaked collective Thomson scattering measurements on laser-produced tin plasmas for extreme ultraviolet lithography. A probe laser beam with a wavelength of 532 nm is used to simultaneously measure the electron plasma wave (EPW) and ion acoustic wave (IAW) spectra. Absolute photon counts for laser scattering off both waves are calculated, taking into account probe laser electron heating and bremsstrahlung background radiation effects. While a large spatiotemporal region can be probed based on the IAW feature, the low signal to noise ratio restricts the EPW measurements to only one location. We propose a portable/traveling tabletop system for practical implementation.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Physics, Fluids & Plasmas
Jianan Wang, Peter J. Bruggeman
Summary: The measurement of the OH density distribution on a fused silica substrate generated by an atmospheric pressure plasma jet in dry and humid helium is reported. The measured OH diffusive flux varied significantly for different experimental conditions, with a maximum value of 1.7 x 10(15) cm(-2) s(-1).
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)