Article
Physics, Applied
Delin Kong, Ping Zhu, Feng He, Ruoyu Han, Bingyan Yang, Manyu Wang, Jiting Ouyang
Summary: The experimental and numerical results demonstrated that the introduction of N-2 and O-2 admixture significantly affects the length and propagation velocity of a helium atmospheric-pressure plasma jet. The changes in electron density outside the grounded electrode are related to the modifications in jet length.
JOURNAL OF APPLIED PHYSICS
(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
Physics, Multidisciplinary
Junyu Chen, Na Zhao, Jiacun Wu, Kaiyue Wu, Furong Zhang, Junxia Ran, Pengying Jia, Xuexia Pang, Xuechen Li
Summary: A study was conducted on the influence of oxygen concentration on the discharge characteristics of an argon plasma jet. It was found that as the oxygen concentration increased, the morphology of the jet changed from diffuse to hollow. The number of discharges, pulse intensity, and the morphology of negative and positive discharges also varied with the oxygen concentration.
Article
Physics, Multidisciplinary
Huiyu Yang, Lei Chen, Guohua Hu, Baohuai Wang, Shiang Wang, Wenjun Zhang, Xingyu Zhang, Peng Song
Summary: In order to widely apply the high concentration of active substances in plasma jets, it is necessary to increase the length of the jet and the contact area between the jet and the object of action. The effect of discharge voltage on plasma jet length was studied by measuring the discharge voltage and capturing images of the discharge.
Article
Multidisciplinary Sciences
Harakat Mohsin Roomy, A. N. Yasoob, Hamid H. Murbat
Summary: The plasma parameters in the Argon plasma jet system were experimentally evaluated using optical emission spectroscopy. The results showed that the electron temperature and electron density varied with the gas flow rates.
KUWAIT JOURNAL OF SCIENCE
(2023)
Article
Physics, Applied
Thijs van der Gaag, Atsushi Nezu, Hiroshi Akatsuka
Summary: Partial arbitrary electron energy distribution function (EEDF) results for cold atmospheric-pressure plasma were obtained using the visible bremsstrahlung inversion (VBI) method. Numerical EEDF of pure argon and helium-argon discharge datasets were reported, showing resemblance with a two-temperature Maxwell distribution. Measurements revealed the electron temperature and relative electron number density for bulk and high-energy electron populations. The VBI method allows the observation of arbitrary EEDF from optical emission spectroscopy (OES) measurement.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
S. Valin, Y. Golubovskii, S. Gortschakow, F. Sigeneger
Summary: In this study, the method of radiation trapping treatment in finite coaxial cylinders using spherical coordinates was introduced. The operator of the resonant transition process was explicitly obtained in matrix form and its response to the delta function was analyzed in both hollow and solid cylinders. The significant spatial redistribution of the excited plasma species due to non-local effects of the radiation transport mechanism was demonstrated through calculations using the developed matrix method (MM).
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Jamal Q. M. Almarashi
Summary: In this study, the effect of a two-electrode argon atmospheric pressure plasma jet with a second grounded electrode (SGE) on the germination rate of basil seeds was investigated. The SGE enhanced the axial electric field in the direction of the treated sample. The plasma operated with two current pulses per each half cycle of applied voltage. When the jet operated with SGE, the second plasma jet current pulse increased from 0.7 mA to 3.6 mA and the emission of O (777.2 nm) increased by 3.85 times compared to operation without SGE. The germination rate increased by eight times after 5 minutes of exposure using SGE. SEM images showed clear etching of the basil seed surface by the plasma jet, with more pronounced etching and cracks when SGE was used, especially at longer exposure times.
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
S. Jaiswal, E. M. Aguirre, T. van der Gaag
Summary: We presented a detailed characterization of an atmospheric pressure plasma jet that produces metastable oxygen and emits the auroral green line. Optical emission spectroscopy was used to analyze the plasma jet and understand the mechanism of metastable oxygen creation and destruction. Changes in the plasma jet behavior were observed when altering parameters.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Applied
Yuanyuan Jiang, Yanhui Wang, Jiao Zhang, Dezhen Wang
Summary: This study investigates the spatial-temporal evolution and transport of singlet delta oxygen in an atmospheric pressure plasma jet using 2D fluid modeling. It finds that the O-2(a(1)Delta(g)) density distribution varies with different oxygen admixtures and the gas flow velocity affects its production and transport.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
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
Multidisciplinary Sciences
Elmar Slikboer, James Walsh
Summary: The study found that the interaction between an argon plasma jet and a liquid target is highly influenced by the electrical characteristics of the target, resulting in typical dielectric barrier discharge behavior with high resistance grounding and DC-like discharge with low resistance grounding.
SCIENTIFIC REPORTS
(2021)
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
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
Mechanics
Xuechen Li, Dongdong Wang, Junyu Chen, Jiacun Wu, Na Zhao, Pengying Jia, Kaiyue Wu
Summary: The study focuses on the behavior of an inert gas plasma jet operating in a streamer discharge mechanism and its interaction with positive ions clouds of different densities and scales. Results show that the streamer behavior is influenced by the density of positive ions, with rarefied ions resulting in free propagation and denser ions causing detouring paths. The detouring process is achieved through the relay of two streamers initiated at different points within the system. Additionally, the study examines the velocity of the streamer and the deflection amplitude of the detouring track based on varying factors such as ion densities, voltage amplitudes, and gap widths.
Article
Engineering, Electrical & Electronic
G. Afifi, M. Atta Khedr, Y. Badr, M. Danailov, P. Sigalotti, P. Cinquegrana, M. B. Alsous, A. R. Galaly
OPTICAL FIBER TECHNOLOGY
(2016)
Article
Physics, Fluids & Plasmas
Ahmed Rida Galaly, Guido Van Oost
PLASMA SCIENCE & TECHNOLOGY
(2017)
Article
Physics, Fluids & Plasmas
Ahmed Rida Galaly, Guido Van Oost
PLASMA SCIENCE & TECHNOLOGY
(2018)
Article
Multidisciplinary Sciences
Mohamed Shaban, A. R. Galaly
SCIENTIFIC REPORTS
(2016)
Article
Biochemistry & Molecular Biology
Atif H. Asghar, Omar B. Ahmed, Ahmed Rida Galaly
Summary: The study demonstrates that utilizing an atmospheric pressure plasma jet operated by an AC high-voltage power source, along with dry and wet argon discharges, as well as a mesh controller and hollow magnets, can lead to complete inactivation of Escherichia coli in a short period of time.
Article
Physics, Fluids & Plasmas
Ahmed Rida Galaly
Summary: The ion velocity distribution in plasma source was investigated by comparing two different configurations of the cathode, showing that the one mesh system electrodes (OMSE) had better agreement with the theoretical ion velocity distribution function and was more effective in avoiding dusty plasma defects during the etching process.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Article
Mechanics
A. R. Galaly, O. B. Ahmed, Atif H. Asghar
Summary: The research shows that increasing the concentration of the TiO2 precursor can enhance the deactivation rate of E. coli, due to the photocatalytic disinfection performance. This is because the increase in TiO2 precursor concentration enhances the effect of the non-thermal jet, leading to the generation of more active substances that can be absorbed by the cells, thereby accelerating the sterilization efficiency.
Article
Chemistry, Physical
Atif H. Asghar, Ahmed Rida Galaly
Summary: An experimental study was conducted on a low-density plasma discharge, focusing on the influence of different cathode configurations on the performance quality of a surgical gown. Plasma treatment was found to significantly enhance the performance of surgical gowns, with the mechanical properties of the OMSE reactor being more positively affected by plasma than those of the OMTSE reactor.
Article
Chemistry, Multidisciplinary
Ahmed Rida Galaly, Nagia Dawood
Summary: During the Hajj and Umrah seasons, all Muslim pilgrims are required to wear Ihram clothes. However, eliminating the spread of microbes attached to the cotton fabric of Ihram presents a challenge. Recent targeted fashion research has proposed a new industrial treatment using atmospheric pressure plasma jet and photocatalytic nanomaterials to treat Escherichia coli attached to cotton fabric samples.
Article
Green & Sustainable Science & Technology
Ahmed Rida Galaly
Summary: This paper investigates the thermodynamic properties of air plasma torches for energy recovery from medical waste and proposes the sale profits of diesel oil and pyrolysis oil in a medical waste treatment project in Makkah.
Article
Biochemistry & Molecular Biology
Ahmed Rida Galaly, Nagia Dawood
Summary: Theoretical and experimental investigations of the radial distribution function of electron temperature in low-density plasma and weakly ionized argon gas are provided. The results show that electron temperatures decrease with an increasing product of radial distance and gas pressures. Comparison of different configurations reveals that generated plasma temperatures decrease and densities increase. The radial distribution function accurately depicts a dramatic decrease for certain scenarios. Furthermore, the mechanical characteristics of treated and pre-treated cotton fabric samples under different plasma cell discharge configurations are compared.
Article
Polymer Science
Ahmed Rida Galaly, Nagia Dawood
Summary: Plasma gasification is a sustainable process that converts plastic waste into fuel oil. A prototype system is being tested to validate this plasma treatment as a strategic vision. The system includes a plasma reactor with a waste capacity of 200 tons per day. The annual plastic waste production in Makkah city from 1994 to 2022 ranges from 224,000 tons to 400,000 tons, with significant amounts of recovered pyrolysis oil and diesel oil. The economic evaluation shows promising sales revenue and cash recovery from the energy extracted from plastic waste.
Article
Physics, Fluids & Plasmas
Ahmed Rida Galaly, Guido Van Oost
Summary: The Kingdom of Saudi Arabia has been selected for thermal plasma treatment of scrap tires, generating 475.4 TJ of heat energy annually. The synthetic syngas and slag produced can be used for various industrial products, resulting in a total annual gross profit of $28.19 million.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2021)
Proceedings Paper
Nanoscience & Nanotechnology
Ahmed Rida Galaly, Farouk Fahmy Elakshar, Mohamed Atta Khedr
ISESCO CONFERENCE ON NANOMATERIALS AND APPLICATIONS 2012
(2013)