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
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
Chemistry, Multidisciplinary
Jacob Manzi, Ariel E. E. Weltner, Tony Varghese, Nicholas McKibben, Mia Busuladzic-Begic, David Estrada, Harish Subbaraman
Summary: This paper demonstrates the use of plasma-jet printing (PJP) to deposit thermoelectric nanoflakes onto flexible substrates at room temperature, with substantial improvements in material adhesion and flexibility observed. The printed films exhibit electrical conductivity of 2.5 x 10(3) S m(-1) and a power factor of 70 mu W m(-1) K-2 at room temperature. This advancement in plasma jet printing promotes not only the development of energy harvesting but also large-scale flexible electronics and sensors for space and commercial applications.
Article
Infectious Diseases
Isabell Plattfaut, Manuela Besser, Anna-Lena Severing, Ewa K. Stuermer, Christian Oplaender
Summary: The antibacterial effects of CAP on Staphylococcus aureus were not significant, with no desired disinfection or reduction in bacterial burden in wet environments or biofilms. CAP treatment is not recommended as a standalone antibacterial therapy for wounds, but could be used to supplement standard treatments.
INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS
(2021)
Article
Chemistry, Multidisciplinary
Julia Mrotzek, Wolfgang Vioel
Summary: The plasma effluent of cold plasma spray was characterized by optical emission spectroscopy, showing rotational temperatures around 4000K and excitation temperatures around 6000K. The gas flow rate had no influence on the spray.
APPLIED SCIENCES-BASEL
(2022)
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.
Article
Polymer Science
Ovidiu S. Stoican
Summary: The cold plasma source operating at atmospheric pressure powered by a voltage multiplier is capable of providing high voltage output as well as an intermediate output of lower voltage and higher current capability. It is designed to study the effect of cold plasma on the surface of various materials, including polymers, by drawing discharge current from both outputs depending on the operating state.
Article
Chemistry, Multidisciplinary
Ku Youn Baik, Hyun Jo, Se Hoon Ki, Gi-Chung Kwon, Guangsup Cho
Summary: The efficiency of simultaneous treatment of cold atmospheric pressure plasma jet (CAP) and hydrogen peroxide (H2O2) was studied for bacterial disinfection. The combination of CAP with H2O2 showed dramatic synergistic effects in killing bacteria by enhancing reactive species transportation and intracellular oxidation. The non-toxic byproducts of CAP and H2O2 make their combination a promising candidate for clinical applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
M. Bakhshzadmahmoudi, S. Jamali, E. Ahmadi
Summary: In this study, we investigated the modification process of polystyrene surface by cold atmospheric pressure plasma jet to achieve a hydrophilic surface. After a certain period of plasma irradiation, the hydrophobic polystyrene surface changed to hydrophilic, and the wettability of the surface increased with time. The evaluation of surface properties was done through measuring water contact angle and Fourier transform infrared spectroscopy, and the relationship between plasma parameters and surface modification of the polymer was discussed.
COLLOID AND POLYMER SCIENCE
(2022)
Article
Automation & Control Systems
Dogan Gidon, Hossam S. Abbas, Angelo D. Bonzanini, David B. Graves, Javad Mohammadpour Velni, Ali Mesbah
Summary: Cold atmospheric plasmas are increasingly used for treatment of complex surfaces in biomedical and biomaterials processing applications, but their operation is challenging due to their complex dynamics and interactions, as well as sensitivity to disturbances. This paper proposes a data-driven LPV modeling framework and a hierarchical LPV-MPC control strategy to regulate the thermal effects of plasma on a surface, demonstrating effectiveness in real-time control experiments.
CONTROL ENGINEERING PRACTICE
(2021)
Article
Physics, Applied
J. Liu, L. Nie, Y. Xian, X. Lu
Summary: The study found that adding a small amount of nitrogen or oxygen to argon can make the plasma channel smooth, while the rotational frequency of the electrode does not affect the appearance of the plasma channel. Optical emission spectra show that adding O-2/N-2 reduces the emission intensity of transitions from excited argon levels to metastable states, leading to a transition of the discharge channel's nature.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Environmental
Zhihao Yi, Likun Chen, Yashuang Ren, Yang Li, Zhen Liu, Jina Wu, Anna Zhu
Summary: An array cold atmospheric pressure plasma jet (ACAPPJ) apparatus was developed to decontaminate toxic chemicals on material surfaces. Experimental results showed that the ACAPPJ could effectively decontaminate aniline and malathion, and the addition of H2O and O-2 could enhance the decontamination efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jia-Shiuan Tsai, Jian-Zhang Chen
Summary: This study investigated the impact of oxygen impurity on the inlet gas in a nitrogen atmospheric pressure plasma jet (APPJ). A numerical model was developed to simulate the nitrogen APPJ considering fluid dynamics, heat transfer, mass transfer, diffusion, and chemical reactions. Experimental tests were conducted to verify the plasma temperature characteristics on the treated surface. The findings revealed that the plasma temperature decreased with increasing oxygen impurity, affecting the excited and neutral species composition.
APPLIED SCIENCES-BASEL
(2023)
Article
Physics, Fluids & Plasmas
Luka Hansen, Benjamin M. Goldberg, David Feng, Richard B. Miles, Holger Kersten, Stephan Reuter
Summary: The relationship between energy flux, flow dynamics, and applied electrical power of a nanosecond pulsed cold atmospheric pressure plasma jet in contact with a substrate surface was investigated. The study found a transition from laminar to turbulent flow at a lower Reynolds number than conventional values, and revealed changes in energy flux with different biasing conditions.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(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)
Review
Physics, Multidisciplinary
S. A. Pshenichnyuk, N. L. Asfandiarov, A. S. Vorob'ev, S. Matejcik
Summary: This paper presents the latest achievements in experimental and theoretical studies of resonance scattering of low-energy electrons from molecular targets, leading to the formation and decay of negative ions. The focus is on dissociative electron attachment spectroscopy for studying the dynamics of molecules with an excess electron. The paper aims to draw attention to these rapidly developing studies abroad that have been scarcely presented in domestic literature.
Article
Chemistry, Physical
Juraj Orszagh, Anita Ribar, Marian Danko, Dennis Bodewits, Stefan Matejcik, Wieslawa Barszczewska
Summary: This study investigated the excitation of nitromethane through electron impact and recorded the emission spectrum at different electron energies. New dissociative excitation channels were observed, and the emission spectrum had significantly higher resolution compared to previous studies.
Article
Food Science & Technology
Silvia Mosovska, Veronika Medvecka, Matej Klas, Stanislav Kyzek, Lubomir Valik, Anna Mikulajova, Anna Zahoranova
Summary: The study evaluated the efficacy of plasma activated water (PAW) for reducing Escherichia coli on soybean seed surface, showing significant antibacterial potential. After 25 minutes of treatment, E. coli was significantly reduced and the antibacterial effect persisted for at least 44 hours.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2022)
Article
Nuclear Science & Technology
Indrek Jogi, Jasper Ristkok, Juri Raud, Jelena Butikova, Kenichiro Mizohata, Peeter Paris
Summary: This study investigated the effect of argon and nitrogen mixtures on the hydrogen H-alpha line emission intensity during LIBS measurements at atmospheric pressure. The results showed that an increased fraction of nitrogen in the background atmosphere led to a faster decrease in H-alpha line intensity and electron density, as well as a lower electron temperature of the created plasma. These findings suggest that nitrogen contributes to higher energy consumption in dissociation and excitation processes and increased quenching of excited H states.
FUSION ENGINEERING AND DESIGN
(2022)
Article
Physics, Multidisciplinary
H. Noori, I Jogi
Summary: In this study, the Townsend breakdown mechanism for direct current discharge in argon gas was discussed, and an analytical expression for the breakdown voltage was derived. The research showed that the non-uniformity of electric field significantly affected the electron multiplication under certain electrode spacing conditions.
Article
Biochemical Research Methods
Vahideh Ilbeigi, Younes Valadbeigi, Ladislav Moravsky, Stefan Matejcik
Summary: In this study, ion mobility spectrometry (IMS) equipped with a corona discharge (CD) ion source was used to measure three auxin plant hormones. The effects of ion polarity and dopants on separation performance were investigated.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Biochemical Research Methods
Ladislav Moravsky, Arian Fateh Borkhari, Alexey Yu Adamov, Alexey A. Sysoev, Peter Papp, Stefan Matejcik
Summary: This study investigated the atmospheric pressure chemical ionization of selected chlorinated hydrocarbons using ion mobility spectrometry and mass spectrometry techniques. The experiments revealed the formation of Cl- ions and [O2H center dot center dot Cl](-) ions for all substances, with the latter being absent in perchlorinated substances. Quantum-chemical calculations supported the experimental observations.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2022)
Article
Crystallography
Lauri Aarik, Carl-Thomas Piller, Juri Raud, Rasmus Talviste, Indrek Jogi, Jaan Aarik
Summary: In this study, aluminum oxide (Al2O3) thin films were deposited using thermal and plasma-assisted atomic layer deposition (ALD) with trimethylaluminum (TMA) and H2O on Si substrates and alpha-Cr2O3 seed layers. The films deposited on Si were all amorphous. On the alpha-Cr2O3 seed layers, alpha-Al2O3 was formed at temperatures ≥350°C in thermal ALD and ≥325°C in plasma-assisted ALD. The Ar plasma used in the experiments had the most significant effect on crystallization when applied during the purge period following the H2O pulse or during the H2O pulse and the following purge. The application of plasma during the TMA pulse, purge following the TMA pulse, or only during the H2O pulse suppressed crystal growth and could potentially serve as a crystal growth inhibitor.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Physics, Multidisciplinary
Talviste Rasmus, Erme Kalev, Paris Peeter, Raud Juri, Plank Toomas, Jogi Indrek
Summary: He:O-2 gas mixtures are popular in non-thermal plasma applications due to their good thermal conductivity and high production of reactive oxygen species. This study focused on experimentally determining the reduced apparent effective ionization coefficient in He:O-2 mixtures. The results were compared with a theoretical model and showed good agreement, highlighting the importance of considering He metastable species and electron attachment in atmospheric pressure plasmas.
Article
Biochemical Research Methods
Vahideh Ilbeigi, Younes Valadbeigi, Ladislav Moravsky, Stefan Matejcik
Summary: Formic acid (FA) is a powerful dopant in atmospheric pressure chemical ionization (APCI) for ion mobility spectrometry (IMS) and mass spectrometry (MS). The dopant produces HCOO-&FA reactant ions and improves detection sensitivity, suppression of fragmentation, and changes in ion mobilities for analytes with suitable molecular structures and gas acidity. The ionization mechanism depends on the gas-phase acidity of the compounds.
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
(2023)
Article
Physics, Applied
Sirli Raud, Juri Raud, Lauri Aarik, Indrek Jogi, Markus Kivimae, Carl-Thomas Piller, Mario Plaas, Toomas Plank, Rasmus Talviste, Tambet Teesalu, Eero Vasar
Summary: The present study investigated the production of reactive chlorine species (RCS) by Ar/O-2 and He/O-2 radiofrequency plasma jets in saline solution, and the sensitivity of the liver cancer cell line HepG2 to RCS and H2O2. Both plasma jets were able to produce RCS; however, the He/O-2 jet was more efficient for RCS production. The lower RCS yield in the case of the Ar/O-2 plasma jet was mainly due to the higher RCS quenching. Viability tests showed that HepG2 cells were more sensitive to H2O2 than RCS.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Analytical
Arian Fateh Borkhari, Ladislav Moravsky, Stefan Matejcik
Summary: An Atmospheric Pressure Field Effect (APFE) ionization source has been developed for positive and negative polarities in drift tube ion mobility spectrometry. The formation of negative and positive ions in synthetic air was compared with the Atmospheric Pressure Corona Discharge (APCD) ionization source. The APFE ionization source showed reliable generation of reactant ions in both polarities, making it a promising chemical ionization source at atmospheric pressure.
ANALYTICAL METHODS
(2022)
