Article
Materials Science, Multidisciplinary
Bishwa Chandra Adhikari, Pradeep Lamichhane, Jun Sup Lim, Linh N. Nguyen, Eun Ha Choi
Summary: In this study, an Ar plasma jet was used to enhance reactive oxygen and nitrogen species (RONS) by mixing atmospheric air with the working gas, resulting in increased production of OH radicals, singlet oxygen, and N-2 second positive system (SPS) in the gas phase. The concentrations of nitrogen dioxide (NO2), hydrogen peroxide (H2O2), and nitrite (NO2-) were also found to be higher in the air-mixed Ar plasma compared to pure Ar plasma. Utilizing naturally sucked atmospheric air through a drilled hole can enhance RONS at similar power consumption compared to pure Ar plasma, which could be beneficial for commercializing non-thermal plasma jets in biomedical and other applications.
RESULTS IN 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
Physics, Fluids & Plasmas
Yuanfu Yue, Stephen Exarhos, Jaehyun Nam, Dongho Lee, Suljo Linic, Peter J. Bruggeman
Summary: This study reports on the interaction of a pulsed atmospheric pressure glow-like discharge with a liquid anode. The role of hydroxyl (OH) radicals and electrons in plasma-enabled redox chemistry in solution was investigated. The results show that the OH density near the liquid surface changes with increasing plasma power, leading to oxidation-reduction reactions in the liquid solution.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yang Li, Shitong Han, Zhanguo Li, Zhen Liu, Longhui Liang, Keping Yan, Anna Zhu
Summary: By using atmospheric pressure plasma jet to decontaminate 2-Chloroethyl ethyl sulfide, the chemical pollutant can be completely removed in a relatively short time with reduced toxicity. Helium APPJ was more effective, generating more .OH and slowly raising the skin surface temperature to 30.4 degrees Celsius within 15 minutes without causing damage.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Ju Sung Kim, Jinsung Choi, Young June Hong, Eun Ha Choi
Summary: An Ar-H-2 arc plasma jet under atmospheric pressure was used to remove tin (Sn) contamination on the multi-thin film surface of the Extreme ultraviolet (EUV) mirror. By converting Sn into SnH4, a gaseous compound that can be easily exhausted, the contamination was effectively removed. The discharge conditions, such as the content of H-2 in the mixture gas, applied power, and treatment time, were varied to investigate the plasma characteristics and the degree of Sn removal. The optimal case was found to be treating for at least 1 min under an applied power of 500 W using 5% of H-2 mixed content.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2023)
Article
Engineering, Environmental
Sunjae Back, Nagahiro Saito, Seunghyo Lee
Summary: We developed a liquid-phase plasma treatment (LPPT) approach for effectively removing high concentrations of ammonia nitrogen from wastewater. We investigated the optimal operating parameters and found that a higher pulse repetition, longer pulse duration, and alkaline conditions were favorable for ammonia nitrogen removal. The mechanism was proposed to involve the collision of accelerated electrons and the oxidation reaction of center dot OH. Our results confirmed the feasibility of LPPT approach for ammonia nitrogen removal.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(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, 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, Applied
Yuanfu Yue, Jingkai Jiang, V. S. Santosh K. Kondeti, Peter J. Bruggeman
Summary: This study measured the density of hydroxyl and hydrogen radicals in an APPJ device operating in a He-H2O mixture using various fluorescence techniques and found that they are mainly generated between the electrodes. The produced H and OH are then convectively transported to the jet effluent, determining the densities in the effluent.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Nishtha Gaur, Hirofumi Kurita, Jun-Seok Oh, Saki Miyachika, Masafumi Ito, Akira Mizuno, Allison J. Cowin, Sarah Allinson, Robert D. Short, Endre J. Szili
Summary: The study investigates the potential role of hydroxyl radicals in cold atmospheric plasma (CAP) jet treatment, showing correlation between CAP jet-induced DNA damage and the presence of hydroxyl radicals. A 'plasma screen' based on a hydrogel film is demonstrated to significantly reduce DNA damage while facilitating the delivery of hydrogen peroxide, which could be beneficial for applications focusing on DNA damage such as cancer treatment, as well as in situations where DNA damage should be minimized, such as open-wound treatment and dermatology.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Jingkai Jiang, Peter J. Bruggeman
Summary: This study utilized molecular beam mass spectrometry to characterize ion fluxes generated by a modulated radiofrequency-driven atmospheric pressure plasma jet in a homogeneous gas environment. The research investigated the influence of RF modulation frequency on ion fluxes and found significant differences in dynamics between positive and negative ions, highlighting the tremendous impact of memory effects on plasma propagation and pre-ionization.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Souma Yoshida, Naoya Murakami, Yoshiyuki Takatsuji, Tetsuya Haruyama
Summary: In this study, the authors found that dissociated nitrogen (N-atom) had a greater impact on ammonia selectivity in the plasma/liquid interfacial reaction compared to excited nitrogen molecules. By connecting the reaction locus with a high N-atom generation device, they achieved high selectivity in aqueous ammonia production while minimizing the formation of aqueous nitrate ions. The researchers also observed the release of oxygen and hydrogen atoms from water, forming NO and hydrogen gas, which further improved the ammonia synthesis selectivity.
Article
Engineering, Chemical
Mohammad Kazemi, Hamed Taghvaei
Summary: Efficient and economical methods for water recovery are in high demand due to recent water crisis caused by growing water demands. Cold atmospheric plasma technology has attracted attention for its chemical and physical effects in removing contaminants from wastewater. Experimental results with multi array dielectric barrier discharge (MADBD) plasma gas diffuser show that ozone (O-3) plays a key role in decolorization of water, with high efficiency and decolorization rate.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Youbin Seol, Minsu Choi, Hongyoung Chang, Shinjae You
Summary: In this study, the relationship between OH radical production and nanosecond pulse characteristics was investigated using optical emission spectroscopy. The results showed that longer pulses generated more OH radicals, which was confirmed by computational chemical simulations. The simulations also revealed that reaction time and N-2 metastable species played critical roles in OH radical generation in the nanosecond range. Additionally, humidity was found to affect the tendency of OH radical production, with shorter pulses being more advantageous in humid conditions.
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.
Review
Multidisciplinary Sciences
Neha Kaushik, Sarmistha Mitra, Eun Jung Baek, Linh Nhat Nguyen, Pradeep Bhartiya, June Hyun Kim, Eun Ha Choi, Nagendra Kumar Kaushik
Summary: This review critically examines methods for generating reactive oxygen species (ROS) and explores their potential as a solution for virus deactivation. The study highlights the ability of ROS to directly eradicate pathogens through oxidative stress and indirectly through non-oxidative mechanisms. Additionally, the novel and environmentally friendly cold plasma delivery system for virus destruction is discussed in detail.
JOURNAL OF ADVANCED RESEARCH
(2023)
Article
Engineering, Environmental
Choe Earn Choong, So Yeon Yoon, Minhee Kim, Gooyong Lee, Sang-Hyoun Kim, Byong-Hun Jeon, Jaeyoung Choi, Yeomin Yoon, Eun Ha Choi, Min Jang
Summary: Hydrophobic sulfur (S) core-shell-layered nano-zero-valent iron (Fe) (S-nZVI) was prepared for NO3- reduction using a post-sulfidation method with varying Fe/S mass ratios. S(0.125)ZVI (Fe/S = 0.125) showed good N-O cleavage properties due to high electron transfer efficiency and low surface passivation. It exhibited higher selectivity of NO3- reduction toward N-2 than sole nZVI in synthetic and actual NO3- groundwater.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Biomedical
Ihn Han, In-Seok Song, Seung Ah Choi, Taebok Lee, Maksudbek Yusupov, Priyanka Shaw, Annemie Bogaerts, Eun Ha Choi, Jae Jun Ryu
Summary: This study proposes the use of low-dose nonthermal biocompatible dielectric barrier discharge plasma (DBD-NBP) on human gingival fibroblasts (HGFs) to enhance wound healing. The treatment inhibits colony formation but not cell death and induces cell migration through ECM degradation and MMP expression. The study also explores the effect of oxidation on the stability and conformation of FAK's catalytic kinase domain (KD).
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wonsun Kim, JaeWoo Park, Yushika Aggarwal, Shital Sharma, Eun Ha Choi, Byoungchoo Park
Summary: In this study, a cathode-side passivation layer of poly(methyl methacrylate) (PMMA) was introduced to enhance the efficiency and stability of self-powered CH3NH3PbI3 perovskite-based photodiodes. The PMMA layer effectively suppressed interface recombination and reduced leakage/noise current in the perovskite film. The PMMA-passivated MAPbI(3) photodiodes demonstrated significantly high specific detectivity values and wide linear dynamic responses with rapid rise and decay response times.
Article
Chemistry, Multidisciplinary
Afza Ahmad, Rohit Kumar Tiwari, Mohd Saeed, Hadba Al-Amrah, Ihn Han, Eun-Ha Choi, Dharmendra K. K. Yadav, Irfan Ahmad Ansari
Summary: In recent times, there has been a significant increase in focusing on the hedgehog (HH)/GLI signaling pathway as a therapeutic target for cervical cancer. The HH pathway is known to play a critical role in the development of cervical cancer and is also associated with recurrence and chemoresistance. Carvacrol (CAR) has previously been shown to inhibit proliferation in prostate cancer cells by targeting the Notch signaling pathway, making it a rational choice to study its antiproliferative effects in cervical cancer cells. This study aimed to investigate the anticancer and apoptotic potential of CAR in C33A cervical cancer cells and explore the underlying mechanisms.
FRONTIERS IN CHEMISTRY
(2023)
Article
Engineering, Chemical
Ju Sung Kim, Jinsung Choi, Young June Hong, Eun Ha Choi
Summary: An Ar-H-2 arc plasma jet under atmospheric pressure was used to remove tin (Sn) contamination on the multi-thin film surface of the Extreme ultraviolet (EUV) mirror. By converting Sn into SnH4, a gaseous compound that can be easily exhausted, the contamination was effectively removed. The discharge conditions, such as the content of H-2 in the mixture gas, applied power, and treatment time, were varied to investigate the plasma characteristics and the degree of Sn removal. The optimal case was found to be treating for at least 1 min under an applied power of 500 W using 5% of H-2 mixed content.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2023)
Review
Environmental Sciences
Paritosh Patel, Aditya Nandi, Suresh K. Verma, Neha Kaushik, Mrutyunjay Suar, Eun Ha Choi, Nagendra Kumar Kaushik
Summary: Emerging bio-contaminants, such as viruses, have had a significant impact on the health and environment of countries worldwide. Understanding the behavior of viruses is crucial in developing targeted therapeutic and vaccination treatments. Animal models, including non-human primates, rodents, and rabbits, offer advantages in assessing the risks of viral infections and chemical toxins, but their maintenance and experimental redundancy are issues. Therefore, exploring alternative animal models, such as zebrafish, is important. This review focuses on zebrafish traits and their potential in monitoring emerging bio-contaminants, particularly viruses like coronaviridae and poxviridae.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Electrical & Electronic
Tirtha Raj Acharya, Dinesh Kumar Chaudhary, Sandhya Gautam, Amrendra Kumar Singh, Rajesh Shrestha, Bishwa Chandra Adhikari, Prajwal Lamichhane, Bhupal Paudyal, Nagendra Kumar Kaushik, Eun Ha Choi
Summary: Thin films of zinc oxide (ZnO) were deposited on glass substrates using chemical bath deposition (CBD) with varied deposition time. The properties and formaldehyde gas responsiveness of the ZnO films were studied in relation to nanoparticle grain sizes. The results showed that longer deposition duration with larger grains led to higher gas response at room temperature. The ZnO films deposited for 1, 2, and 3 h exhibited maximum responses of 5.5, 11.0, and 17.8, respectively, at 400 ppm formaldehyde gas. Additionally, the films could detect as low as 100, 25, and 12 ppm of formaldehyde, respectively.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Physics, Multidisciplinary
Asad Ur Rehman, Amir Muhammad Afzal, Muhammad Waqas Iqbal, Saikh Mohammad Wabaidur, Essam A. Al-Ammar, Sohail Mumtaz, Eun Ha Choi, Muhammad Ali
Summary: In this research, polyaniline (PANI) was used to enhance the electrochemical capabilities of silver-zinc sulfide (AgZnS). The PANI was synthesized via polymerization of aniline, while the AgZnS was synthesized hydrothermally. Adding 50% PANI in AgZnS resulted in an excellent specific capacity (Q(s)) of 1121.6 Cg(-1). The assembled supercapattery device with 50% PANI exhibited a highest Q(s) of 223.44 Cg(-1), along with a tremendous energy density of 49.65 Wh kg(-1) at a power density of 795.33 W kg(-1).
Article
Physics, Applied
Prajwal Lamichhane, Tirtha R. Acharya, Jaewoo Park, Kirubel A. Amsalu, Byoungchoo Park, Eun Ha Choi
Summary: This study investigates the effects of nonthermal plasma characteristics on surface treatments of polyvinyl alcohol. Various diagnostics, such as Raman spectroscopy, work of adhesion, optical emission spectroscopy, and current-voltage measurements, were used. The findings highlight the importance of controlling the plasma's electron temperature and density to achieve desired surface treatment outcomes. Plasma jets with varying electron temperatures are found to be more suitable for different surface treatments, with high electron temperatures (>1.1 eV) suitable for functional group insertion and low electron temperatures for plasma etching, which increases surface roughness significantly.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Physical
Muhammad Ali, Amir Muhammad Afzal, Muhammad Waqas Iqbal, Asad Ur Rehman, Saikh Mohammad Wabaidur, Essam A. Al-Ammar, Sohail Mumtaz, Eun Ha Choi
Summary: In this study, rGO and CoMnS nanostructures were synthesized and their structural and electrochemical properties were measured. The rGO@CoMnS composite electrode material showed a superior specific capacity of 1355.8 C/g compared to the reference electrode (747.6 C/g) in a 3-electrode measurement system. The estimated specific capacitance was 2238 F/g. This study provides new opportunities for designing high-performance energy devices.
Article
Engineering, Environmental
Shaik Abdul Munnaf, Min Jang, Eun Ha Choi
Summary: In this study, non-thermal plasma was used along with synthesized nano-particles to remove inorganic and organic compounds, achieving environmental safety. Plasma-generated reactive species were employed for oxidation and reduction processes. The maximum concentrations of H2O2 and NOx were found in deionized water. The removal capacity for arsenic was determined as 4.69 mg/g. The study also demonstrated the catalytic enhancement of synthesized nanoparticles in the removal of organic compounds. The results showed the potential of this eco-friendly method for pollutant removal and the recycling of waste material.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Review
Biochemistry & Molecular Biology
Desh Deepak Singh, Ihn Han, Eun-Ha Choi, Dharmendra Kumar Yadav
Summary: SARS-CoV-2 causes severe respiratory distress and organ failure, and supportive treatment options are currently used. Targeting viral proteins and enzymes, as well as developing antibodies and antiviral drugs, are effective approaches for COVID-19 treatment. Clinical studies are exploring various therapy categories. This article provides new insights into drug pathophysiology and development.
CURRENT ISSUES IN MOLECULAR BIOLOGY
(2023)
Review
Green & Sustainable Science & Technology
Pradeep Lamichhane, Nima Pourali, Lauren Scott, Nam N. Tran, Liangliang Lin, Marc Escriba Gelonch, Evgeny V. Rebrov, Volker Hessel
Summary: This perspective explores the green synthesis of ethylene using plasma technology. The performance, sustainability, and comparison with conventional and alternative methods are evaluated. The importance of considering environmental, social, and governance factors in business decisions is emphasized, and plasma technology is highlighted as a potentially promising approach for green ethylene synthesis.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2024)
Article
Engineering, Biomedical
Nagendra Kumar Kaushik, Pradeep Bhartiya, Neha Kaushik, Yungoh Shin, Linh Nhat Nguyen, Jang Sick Park, Doyoung Kim, Eun Ha Choi
Summary: This study demonstrates that nitric oxide enriched plasma-activated water (NO-PAW), generated by a microwave plasma system, effectively inhibits coronavirus infection in host lung cells and improves host antiviral responses.
BIOACTIVE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Zhiqiang Li, Xiaoxiao Hu, Zhao-Yun Zeng, Yajiang Chen, Ai-Xi Chen, Xiaobing Luo
Summary: This work demonstrates how the current phase transition of atomic Bose-Einstein condensates in a trap can be controlled by applying an oscillatory driving field. The self-trapping effect in momentum space allows for a suppression of oscillations and a nearly constant directed current. Mean-field chaos serves as an indicator of the quantum phase transition. These findings are supported by an effective three-mode model.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Jinqin Ye, Yi Li, Jun Ding, Heng Yu, Xianqi Dai
Summary: Constructing van der Waals heterostructures is an efficient approach to enhance the properties and broaden the applications of two-dimensional materials. This study explores the structure, stability, electronic, and optical properties of BlueP/MoSSe heterostructures using density functional theory calculations. It is found that the bandgap and band edge of these heterostructures can be effectively modulated by strain and electric field.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Simone Anzellini, Silvia Boccato, Samuel R. Baty, Leonid Burakovsky, Daniele Antonangeli, Daniel Errandonea, Raffaella Torchio
Summary: The melting line of cobalt was investigated through experimental and theoretical methods, revealing a phase transition from hexagonal close-packed structure to face-centered cubic structure at high temperatures. The melting temperatures obtained from both methods showed good agreement and can be described by a Simon-Glatzel equation. Additionally, a thermal equation of state for the face-centered cubic phase of cobalt was determined.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Jiajuan Qing, Shisheng Zhou, Jimei Wu, Mingyue Shao
Summary: This paper investigates the nonlinear chaotic vibrations of fractional viscoelastic PET membranes subjected to combined harmonic and variable axial loads. The viscoelasticity of PET membrane is characterized by the fractional Kelvin-Voigt model. The reliability of the numerical strategy is proved by comparing the results with available fractional systems and examples. The influence of system parameters on chaotic behaviors is described using bifurcation diagrams and detailed responses. This research provides a fundamental framework for controlling viscoelastic substrates in flexible manufacturing.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Aly R. Seadawy, Syed T. R. Rizvi, Bazgha Mustafa, Kashif Ali
Summary: In this research, the complete discriminant system of polynomial method is used to analyze the dynamic characteristics of the cubic-quintic nonlinear Schrodinger equation with an additional anti-cubic nonlinear term, with a focus on the introduction of various optical solitons and wave structures. The analysis illustrates the importance of the polynomial method and provides dynamic results for the solutions.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Ruihang Huang
Summary: This study utilized bibliometric analysis to examine the development of multi-scale calculation of carbon nanotubes. Using CiteSpace III software, 1253 relevant articles from the SCI Expanded database were analyzed to identify research trends in this field. The findings revealed significant progress in the research of multi-scale calculation of carbon nanotubes from 1999 to 2023. The analysis of keywords, literature co-citation network, and keyword cluster network provided valuable insights into the knowledge base, important research results, and research hotspots in this field. Additionally, the study predicted future hot research directions using keyword breakout analysis. The research provides profound insights and important guidance for researchers and policymakers in the field of multi-scale calculation of carbon nanotubes to promote further innovation and development.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xiaohua Zhou, Erhu Zhang, Shumin Zhao, Lei Zhang
Summary: A theoretic model is proposed to study the adhesion behavior of a vesicle adhering inside another vesicle in 2-D case. The model investigates the equilibrium shape equations and boundary conditions, and reveals the phase diagram and critical adhesion condition in different situations.
RESULTS IN PHYSICS
(2024)
Article
Materials Science, Multidisciplinary
Xin Yi, Jia-Cheng Huo, Yong-Pan Gao, Ling Fan, Ru Zhang, Cong Cao
Summary: The paper introduces an iterative quantum algorithm based on quantum gradient descent to solve combinatorial optimization problems, verifying the effectiveness and robustness of the algorithm through numerical simulations and comparison with other algorithms. Experimental results on a real quantum computer also demonstrate the feasibility and performance of the algorithm.
RESULTS IN PHYSICS
(2024)
