Article
Physics, Fluids & Plasmas
Thibault Darny, Gerard Bauville, Michel Fleury, Stephane Pasquiers, Joao Santos Sousa
Summary: This paper investigates the modification of argon flow in a cold plasma jet under the influence of nanosecond high voltage pulses, examining both single and multiple pulse applications. The research shows that a single pulse is sufficient to disrupt the flow, with multiple pulses revealing a 3D helical arrangement of ripples in the plasma plume. Optimal disturbance of the flow is achieved at specific pulse repetition frequencies for different flow rates, with higher frequencies leading to the gradual disappearance of ripples.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
K. Polaskova, D. Necas, L. Dostal, M. Klima, P. Fiala, L. Zajickova
Summary: The self-organization phenomena observed in the radio frequency plasma slit jet have significant implications in the field of nanotechnology. These phenomena are influenced by gas feed and material properties.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
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
Biochemistry & Molecular Biology
Jie Zhuang, Qian Yuan, Congcong Chen, Gengliang Liu, Zhengyi Zhong, Kai Zhu, Jinsong Guo
Summary: This study investigates the potential molecular mechanism of ns-CAPJ in inhibiting the invasive migration of human GBM cells. The findings show that ns-CAPJ significantly reduces GBM cell invasion and migration, and induces apoptosis in GBM cells. Further mechanistic studies demonstrate that the suppression of the epithelial-mesenchymal transition (EMT) signaling pathway is correlated with ns-CAPJ's inhibitory effect on GBM cell invasion and migration.
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Maho Yagi-Utsumi, Tomohiro Tanaka, Yoko Otsubo, Akira Yamashita, Shinji Yoshimura, Motohiro Nishida, Koichi Kato
Summary: The study reveals that cold atmospheric plasma can affect the amyloidogenic protein Aβ associated with Alzheimer's disease by selectively oxidizing certain amino acid residues, inhibiting its fibril formation. This provides insights into potential novel applications of CAP.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Engineering, Chemical
Zhitong Chen, Richard Obenchain, Richard E. Wirz
Summary: Researchers developed a single-electrode tiny plasma jet for clinical biomedical applications, studying the effect of voltage input and flow rate on the jet length and physical parameters. Interactions between the tiny plasma jet and different subjects showed an increase in ROS/RNS intensity as the distance decreased. These findings suggest the potential use of the tiny plasma jet device in clinical biomedical applications.
Review
Physics, Fluids & Plasmas
Heping LI, Jing LI, Xiting Zhao, Liyan Wang, Chuan Fang, Nan Su, Chong Zhang, Yan Xu, Meng Lv, Mingjun LI, Xinhui Xing
Summary: Cold atmospheric plasmas (CAPs) have shown great applicability in agriculture, particularly in promoting plant growth and treating diseases. In this study, the stimulating effects of atmospheric-pressure dielectric-barrier-discharge plasmas (AP-DBD) on plants for growth promotion and disease control are reviewed. The special demands on the characteristics of CAP sources for plant mutation breeding are also discussed. An atmospheric and room temperature plasma (ARTP) jet generator is designed for direct plant mutagenesis, and an ARTP-P mutation breeding machine is developed based on this generator. Experimental measurements and agricultural experiments show that the ARTP-P mutation breeding machine has significant mutagenesis effects on plant seeds, providing a platform for systematic studies on mutation mechanisms and results in future research.
PLASMA SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yujuan Cao, Zhenyan He, Yuting Gao, Yanru Xin, Liang Luo, Fanling Meng
Summary: In this study, a bait-hook-devastate strategy was developed to improve the efficiency of photodynamic degradation of amyloid aggregates by utilizing electronic interactions to accumulate aggregates and photosensitizer in a confined area. The strategy significantly enhanced the utilization rate of generated ROS and ability to dissociate the aggregates, resulting in rapid and complete degradation of amyloid aggregates under mild conditions. This new paradigm offers a potential solution for accelerating photodynamic degradation of amyloid aggregates for practical applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Fluids & Plasmas
Yi Liu, Li Lin, Michael Keidar
Summary: This research discovers that electromagnetic emissions from cold atmospheric plasmas can cause cell membrane oscillations and increase sensitivity to the chemical active ingredients used in treatments. The study calculates the spatial distribution of electromagnetic emission power density spectrum from a cold atmospheric helium plasma jet, and identifies plasma oscillations as the main source of electromagnetic radiation.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Polymer Science
Yu Zhao, Qiushi Li, Qingqing Huang, Yang Liu
Summary: A self-destructive nanoscavenger (SDNS) has been developed to capture and deliver soluble beta-amyloid aggregates (sA beta s) into microglial lysosomes via hydrogen-bonding interactions. The SDNS then self-destruction within lysosomes and stimulates autophagy, promoting the degradation of neurotoxic sA beta s. Furthermore, enhanced autophagy suppresses the secretion of inflammatory factors by microglia, which is induced by internalized sA beta s. This synergistic approach shows potential as a therapeutic strategy for Alzheimer's disease.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Physics, Applied
Chenzi Lu, Junlin Fang, Shaofeng Xu, Ying Guo, Jianjun Shi
Summary: A noninvasive method was developed to measure the electrical potential in an atmospheric pressure plasma jet. The study showed that the electrical potential plays a significant role in the propagation of ionization waves, and proposed a new method to manipulate the wave propagation by controlling the amplitude of the electrical potential on the auxiliary electrode.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Chemical
Alireza Badi Sar, Eslam Ghareh Shabani, Mohammad Haghighi, Maryam Shabani
Summary: In this study, a hybrid process including a magnetic carbon nanomaterial/NiFe2O4 promoted plasma jet system was evaluated for the removal of CIP. The results showed that different carbon materials had different removal efficiencies, with ChAC exhibiting the highest removal efficiency. However, the issue of separation can be solved by magnetization.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Optics
S. Mashayekh, N. Cvetanovic, G. B. Sretenovic, B. M. Obradovic, Z. Liu, K. Yan, M. M. Kuraica
Summary: Cold plasma jets at atmospheric pressure, powered by a short-pulse voltage, have been widely used for treatment of various biosamples and other applications. This experimental study focuses on a reactor powered by a 400 ns rise time voltage pulse and operating with helium gas, aiming to obtain data on the development of jet streamer and plasma parameters near the target. The results show fast streamer progression (105 m/s) with strong electric field during the maximum current period (33 kV/cm), which can be attributed to the fast rise of the voltage pulse.
EUROPEAN PHYSICAL JOURNAL D
(2023)
Article
Physics, Multidisciplinary
A. Boudjadar, F. Bouanaka, S. Rebiai
Summary: In this study, a 2D axisymmetric fluid model for an atmospheric pressure plasma jet driven by an 8 kV voltage pulse was investigated using COMSOL@ Multi-physics software. The results identified physical phenomena occurring in a cold plasma jet at atmospheric pressure with an argon pathway, providing a platform for future plasma jet applications.
Article
Materials Science, Multidisciplinary
Jhao-Yu Guo, Yu-Lin Kuo, Hsien-Po Wang
Summary: A rapid plasma-assisted nitriding process using H-2/N-2 mixture gas was proposed to treat the surface of SKD11 cold-working steel in this study, resulting in increased surface hardness and impact wear resistance. The process formed a functional nitride layer with higher deformation resistance and improved the lifetime of SKD11 tool steel.
Article
Physics, Fluids & Plasmas
Han Xu, Dingxin Liu, Zhijie Liu, Weitao Wang, Wenjie Xia, Li Guo, Xiaohua Wang, Michael G. Kong
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2019)
Article
Physics, Applied
Youssef Morabit, Richard D. Whalley, Eric Robert, Mohammad Hasan, James L. Walsh
PLASMA PROCESSES AND POLYMERS
(2020)
Article
Physics, Applied
Natasa Hojnik, Martina Modic, Dusan Zigon, Janez Kovac, Andrea Jurov, Aaron Dickenson, James L. Walsh, Uros Cvelbar
Summary: The study reported the complete removal of aflatoxin B-1 from corn kernels using indirect cold atmospheric pressure plasma treatment, which induced slight oxidation on the surface of the kernels. This research confirms the effectiveness of cold plasma technology as a food processing method for mycotoxin decontamination and paves the way for its acceptance as a safe food processing method.
PLASMA PROCESSES AND POLYMERS
(2021)
Article
Physics, Applied
B. Gilbart, A. Dickenson, J. L. Walsh, M. Hasan
Summary: In this study, a two-dimensional fluid model of atmospheric pressure surface barrier discharges (SBDs) was developed and experimentally validated to investigate the impact of heating mechanisms on discharge chemistry. It was found that ion flux heating is the dominant mechanism affecting the dielectric material and downstream flow of the SBD, leading to significant changes in reactive nitrogen species production. The largest impact of plasma heating was observed in the increase of NO2 concentration by almost 50% compared to constant temperature conditions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Sing Wei Ng, Elmar Slikboer, Aaron Dickenson, James L. Walsh, Peng Lu, Daniela Boehm, Paula Bourke
Summary: By modifying the position of the ground electrode, two different discharge compositions were achieved, thus affecting the composition of the generated plasma activated water. Through colorimetric testing and imaging results, it was found that only one configuration was able to produce PAW with a high concentration of hydrogen peroxide.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Elmar Slikboer, James Walsh
Summary: The study investigated the electron dynamics in an Argon plasma jet interacting with a liquid surface under AC excitation, revealing differences in discharge behavior between grounded and floating liquid states. The discharge process was divided into pre-, main-, and post-breakdown phases, with electron density and temperature affected by the grounding status of the liquid.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Breno A. B. Salgado, Stefania Fabbri, Aaron Dickenson, Mohammad Hasan, James L. Walsh
Summary: Cold plasma generated in air at atmospheric pressure is highly effective in antimicrobial applications, particularly against bacterial biofilms. The study focused on the microbial inactivation mode of a surface barrier discharge against Escherichia coli biofilms, revealing a synergistic interaction between long-lived reactive species and UV photons which significantly increased the antimicrobial efficacy.
Article
Physics, Applied
A. Dickenson, J. L. Walsh, M. I. Hasan
Summary: The direct interaction between a non-equilibrium gas discharge and a liquid volume leads to the generation of a plasma activated liquid, which induces flows in both the gas above the liquid and within the liquid volume. The dominant mechanism driving the liquid flow at the plasma-liquid interface is found to be correlated with the charge relaxation time of the liquid.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
M. S. Bieniek, J. L. Walsh, M. I. Hasan
Summary: The electron thermalization process is significant in nanosecond pulsed discharges, and two modeling approaches were compared in studying the electron kinetics in helium plasma with an oxygen admixture. Differences in electron population decay and reaction rate coefficients were observed between modeling based on the local time-dependent electron Boltzmann equation and the local mean energy approximation. Global modeling of plasma species densities in response to an electric field showed differences in electron density between the two approaches.
PHYSICS OF PLASMAS
(2021)
Review
Food Science & Technology
Andreas S. Katsigiannis, Danny L. Bayliss, James L. Walsh
Summary: Food and drink manufacturers prioritize food safety and are exploring cold atmospheric pressure plasma (CAP) as a potential technique for surface and equipment decontamination in food processing environments. However, current CAP research is still in its early stages and lacks cohesive information for easy comparison. Scaling CAP technology to meet industry needs is also a significant challenge.
COMPREHENSIVE REVIEWS IN FOOD SCIENCE AND FOOD SAFETY
(2022)
Article
Physics, Applied
Benjamin Gilbart, Aaron Dickenson, James L. Walsh, Mohammad Hasan
Summary: This study investigates how the electrode width of a surface barrier discharge (SBD) array affects the deposited power, the induced flow, and the spatial distribution of reactive species delivered to a downstream sample. It is shown that decreasing electrode width increases the power density and intensifies the oscillatory flow. The study identifies and quantifies a transition between convection-driven and diffusion-driven delivery for different electrode widths and distances between SBDs and the treated surface, and links ripples in the delivered flux to convection-driven delivery.
PLASMA PROCESSES AND POLYMERS
(2022)
Article
Physics, Fluids & Plasmas
Alexandra Brisset, Benjamin Harris, Aaron Dickenson, Kari Niemi, James Walsh, Erik Wagenaars
Summary: Control of plasma chemistry is crucial for atmospheric pressure plasma in various applications. This study investigates the effects of humidity on discharge development, electric field, and electron density through experiments and modeling, providing experimental data for verifying kinetic models of plasmas in controlled environments.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Fluids & Plasmas
Alexandra Brisset, Matthew Bieniek, Laurent Invernizzi, Mohammad Hasan, James Walsh, Kari Niemi, Erik Wagenaars
Summary: This study investigates the spatio-temporal distribution of O and H radicals in a 90 ns pulsed discharge in He + H2O gas. Experiment and 1D fluid modelling show good agreement for the densities of O and H radicals. O and H densities are found to be homogeneous along the discharge axis. O is mainly produced by direct dissociation of O2 by electron impact during the discharge, and by dissociative recombination of O2 (+) in the early afterglow. H follows a similar production process as O, but with a stronger initial production of O in the presence of higher concentrations of water vapor.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Jaka Olenik, Vasyl Shvalya, Martina Modic, Jernej Ekar, Janez Kovac, Uros Cvelbar, James L. Walsh
Summary: Fourier transform infrared spectroscopy (FTIR) is commonly used to study gas-phase reactive oxygen and nitrogen species (RONS). However, the presence of interfering peaks in spectral data poses challenges. This study investigates the interaction between reactive oxygen and nitrogen species generated by a non-equilibrium air plasma and the metal halide windows of an FTIR gas cell, leading to the appearance of spurious absorption peaks. Various spectroscopic techniques were employed to determine the origin of these peaks and it was found that KBr exposed to plasma showed a lower fraction of bromine and the formation of NO3 nitrate group. The evolution of these absorption peaks affected the window transparency and was correlated with KNO3 formation, plasma power, and exposure time.
JOURNAL OF ANALYSIS AND TESTING
(2023)
Article
Physics, Fluids & Plasmas
Gagandeep Singh Matharoo, James L. Walsh
Summary: This study describes the design and characterization of a unique repetitive pulsed power source that generates low-temperature plasma at atmospheric pressure in contact with water. The generated plasma produces highly oxidizing chemical species that can degrade recalcitrant organic contamination. The system's electrical efficiency ranges from 37% to 49% depending on the pulse repetition rate.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)