Article
Materials Science, Multidisciplinary
A. Pervikov, M. G. Krinitcyn, E. A. Glazkova, N. G. Rodkevich, M. Lerner
Summary: In this study, bimodal tungsten carbide WC powders were successfully prepared through a two-stage process involving EEW synthesis and carburization reaction. By determining the synthesis conditions and optimal parameters, high yield and carbon content close to theoretical value were achieved.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Nivedhitha Kabeerdass, Karthikeyan Murugesan, Natarajan Arumugam, Abdulrahman Almansour, Raju Suresh Kumar, Sinouvassane Djearamane, Ashok Kumar Kumaravel, Palanivel Velmurugan, Vinayagam Mohanavel, Subbiah Suresh Kumar, Selvaraj Vijayanand, Parasuraman Padmanabhan, Balazs Gulyas, Maghimaa Mathanmohun
Summary: This study demonstrates the potential of green synthesis of silver nanoparticles from Alternanthera sessilis in treating wound infections. Various analysis methods were used to show the inhibitory effect of As-AgNPs on Klebsiella pneumoniae and its embedding in fabrics. Cell experiments confirmed the non-toxicity of As-AgNPs on cell survival and proliferation.
Article
Engineering, Environmental
P. S. Chandrashekharaiah, Yash Gupte, Purbasha Sarkar, Shyam Prasad, Debanjan Sanyal, Santanu Dasgupta, Avishek Banik
Summary: The synergistic interaction between algae and bacteria can be utilized to develop next-generation wastewater treatment systems, improving the efficiency of bioremediation and wastewater reuse.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Engineering, Chemical
Taketoshi Koita, Yoshiki Egawa, Yutaro Takaya, Keishi Oyama, Soowon Lim, Takao Namihira, Chiharu Tokoro
Summary: The study compared the size distributions of Ag particles generated by electric explosion of a wire (EEW) and pulsed wire discharge (PWD) methods in air. The results showed that PWD method produced Ag particles with a more concentrated and monodispersed size distribution. The restrike with plasma in PWD was found to contribute to the narrower particle size distribution.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
A. Hollingsworth, M-F Barthe, M. Yu Lavrentiev, P. M. Derlet, S. L. Dudarev, D. R. Mason, Z. Hu, P. Desgardin, J. Hess, S. Davies, B. Thomas, H. Salter, E. F. J. Shelton, K. Heinola, K. Mizohata, A. De Backer, A. Baron-Wiechec, I Jepu, Y. Zayachuk, A. Widdowson, E. Meslin, A. Morellec
Summary: Self-ion irradiation of pure tungsten with 2 MeV W ions has been used to simulate microstructures generated by neutron irradiation in tungsten components of a fusion reactor. Characterization of defects formed in tungsten samples by ion irradiation has been achieved using Transmission Electron Microscopy, Thermal Desorption Spectrometry, and Positron Annihilation Spectroscopy. Results indicate an increase in defect density with increasing irradiation dose, followed by a slight decrease above 0.1 dpa, with defect saturation observed between doses of 0.085 to 0.425 displacements per atom.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Review
Chemistry, Analytical
Jun Cao, Yongzhen Sun, Baoan Wu, Huiyi Tang, Yong Ding, Kexing Song, Chengqiang Cui
Summary: Considering the replacement of high-carbon steel wire by tungsten wire in diamond cutting, it is crucial to study tungsten alloy wire with enhanced strength and performance. This paper highlights the influence of various technological factors, such as powder preparation, press forming, sintering, rolling, rotary forging, annealing, and wire drawing, on the properties of tungsten alloy wire. In addition, it summarizes the effects of altering tungsten alloy composition and improving processing technology on the microstructure and mechanical properties of tungsten and its alloys, and identifies the future development direction and trend for tungsten and its alloy wires.
Review
Physics, Applied
Huantong Shi, Guofeng Yin, Xingwen Li, Jian Wu, Anthony B. Murphy, Yongmin Zhang, Aici Qiu
Summary: Underwater Electrical Wire Explosion (UEWE) is an efficient source of underwater shock waves, with good controllability and repeatability, already showing success in industrial applications and promising potential in various fields. The review evaluates physical processes, numerical simulation methods, electrical and shock wave characteristics, and current/potential applications, while also providing suggestions for future research directions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Yanxu Pu, Fangwei Lv, Xinfeng Sun, Tianping Zhang, Hui Qi, Hai Geng, Chenchen Wu, Xinwei Cheng
Summary: The molecular dynamics simulations of high voltage pulse explosion of single aluminum wires with different diameters revealed that larger diameter wires have better performance, maintaining higher deposition energy density and lower vaporization rate.
Article
Chemistry, Analytical
Apiwat Muttamara, Patittar Nakwong
Summary: This study aimed to investigate the performance of zinc-coated brass wire in wire-cut electrical discharge machining (EDM) using an ultrasonic-assisted wire on tungsten carbide. The research focused on the effect of the wire electrode material on the material removal rate, surface roughness, and discharge waveform. Experimental results demonstrated that using ultrasonic vibration improved the material removal rate and reduced surface roughness compared to conventional wire-EDM. Cross-sectional SEM of the white layer and discharge waveform were investigated to explain the phenomena of ultrasonic vibration in the wire-cut EDM process.
Article
Materials Science, Multidisciplinary
Daqiang Jiang, Zhenghao Jia, Hong Yang, Yinong Liu, Fangfeng Liu, Xiaohua Jiang, Yang Ren, Lishan Cui
Summary: The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated during tensile deformation using HEXRD and TEM analysis, revealing lattice strain, local elastic strain, plastic deformation, and necking of the nanowire. These behaviors were found to be associated with stress-induced martensitic transformation in the TiNi matrix.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Applied
D. Maler, A. Rososhek, S. Efimov, A. Virozub, Ya E. Krasik
Summary: The acceleration of a target by employing the shock compression and water flow generated by the underwater electrical explosion of a wire array is an efficient approach, with target velocities of up to 1360 m/s measured. The experimental, numerical, and analytical modeling results demonstrate that a temporally unmovable barrier between the exploding array and the target increases pressure and leads to higher shock velocity in the target, providing insight into the phenomenon.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Chemical
Ze Wang, Zengliang Zhang, Wen Tian, Zheshi Wang
Summary: This study investigates the coupling effect of a side explosion vent and wire mesh on suppressing methane explosion. The results show that the suppression effect is better when the vent is closer to the ignition source. The wire mesh is effective for configurations with low flame speeds, but struggles to suppress high-speed turbulent flames.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Article
Chemistry, Physical
Wonki Lee, Jungtae Nam, Jaejun Park, Geonhee Lee, Seok hoon Ahn, Keun Soo Kim, Jeong-O Lee, Chel-Jong Choi, Jun Yeon Hwang
Summary: This study presents an efficient method for dispersing and reducing the defects of graphene oxide (GO) through a pulsed wire discharge (PWD) process in an organic solvent. The results show that copper wire and carbon fiber can effectively control the electric explosion process, resulting in GO with low oxygen content and excellent electrical conductivity.
Article
Materials Science, Coatings & Films
Nur Afira binti Anuar, Nurul Hidayah Mohamad Nor, Rozidawati binti Awang, Hideki Nakajima, Sarayut Tunmee, Manoj Tripathi, Alan Dalton, Boon Tong Goh
Summary: Large-area graphene nanoplatelets were successfully fabricated on tungsten nanoparticles coated substrates using hot-wire chemical vapor deposition, with a detailed growth mechanism proposed for the nucleation process under the influence of argon plasma treatment. The optimized condition resulted in high-quality continuous graphene layers with excellent optical transparency and low sheet resistance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Shengbin Zhao, Lijun Yang, Yiming Huang, Sai Xu
Summary: The study introduces a novel method for additive manufacturing of Ni/WC composite coatings via laser wire deposition. The research analyzes the processing characteristics of typical wire transfer modes and material characterization methods to investigate the phase compositions, microstructural features, hardness, and wear resistance of the coatings. The results show that using wire plunging transfer mode can achieve higher hardness and minimum wear loss in the coatings.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Abhishek Sharma, Myneni Sukesh Babu, Asapu Vinaya Kumar, R. Sarathi, V Subramanian
Summary: The study investigates the impact of reinforcing multi-walled carbon nanotubes and uni-directional carbon fibre fabric in the epoxy polymer matrix on the electromagnetic interference shielding efficiency. The results show that increasing the weight percentage of the carbon nanotubes improves the shielding efficiency of the nanocomposites. Furthermore, including a layer of carbon fibre fabric significantly enhances the shielding efficiency of the structure.
BULLETIN OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Composites
Gandluri Parameswarreddy, Yugandhara Rao Yadam, Kavitha Arunachalam, Ramanujam Sarathi, Hisayuki Suematsu
Summary: This study investigates the electromagnetic interference (EMI) shielding effectiveness of an epoxy polymer composite reinforced with carbon fiber mat, short carbon fiber, and multi-walled carbon nanotube in the X-band. The results demonstrate that the orientation of carbon fiber mat has an impact on the EMI shielding, while the addition of short carbon fiber and multi-walled carbon nanotube can enhance the shielding effectiveness. Microstructural analysis reveals a uniform dispersion and strong adhesion of the additives in the epoxy matrix, leading to improved mechanical properties. The homogeneous epoxy composite with enhanced EMI shielding ability and mechanical properties shows promise as an efficient EMI shielding material.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Composites
Moutusi Paul, Palash Mishra, Pabbati Vinod, Ramanujam Sarathi, Mithun Mondal
Summary: This research focuses on the development of silicone rubber nanocomposites for use in nuclear power stations, capable of withstanding the stress posed by gamma-ray irradiation. Various tests were conducted to assess the surface changes, thermal stability, moisture absorption behavior, and erosion resistance of the specimens.
POLYMER COMPOSITES
(2023)
Article
Computer Science, Information Systems
J. Manoj Dhivakar, Myneni Sukesh Babu, Ramanujam Sarathi, Stefan Kornhuber, Naresh Chillu
Summary: Silicone rubber micro-nanocomposites filled with micro-ATH and nano-alumina particles were irradiated with gamma rays to investigate the changes in surface condition. Contact angle, AFM analysis, CIV measurement, LIBS analysis, and other techniques were used. The recovery rate of the micro-nanocomposites was found to be lower compared to the base SR material. The data showed correlations between the contact angle, CIV, surface roughness, and other properties. Sample S2 exhibited relatively less degradation after irradiation.
Article
Computer Science, Information Systems
K. Sanjana, Myneni Sukesh Babu, Ramanujam Sarathi, Naresh Chillu
Summary: Silicone rubber samples were coated with various artificially prepared pollutants and analyzed using laser-induced breakdown spectroscopy (LIBS) to identify and distinguish them. LIBS successfully identified the elemental composition of different pollutants, such as copper sulphate, carbon-based compounds (fly ash, coal), and calcium-based compounds (cement, calcium phosphate). LIBS spectral data combined with machine learning (ML) algorithms achieved a classification accuracy of 97.43% using Light gradient boosting technique, with a reasonable computation time of 5.1 s.
Article
Computer Science, Information Systems
S. K. Amizhtan, R. Akash, Ramesh L. L. Gardas, R. Sarathi, B. Aryanandiny
Summary: The present study investigates the influence of different surfactants on the electrical and rheological properties of nano-silica based ester fluid. The inclusion of ionic and non-ionic surfactants improves the stability of the nanofluid. CTAB, as a surfactant, enhances the discharge resistance property and the breakdown strength of the ester nanofluid. The fluorescent fiber technique is more sensitive than the Ultra high frequency sensor in detecting corona discharge.
Article
Engineering, Electrical & Electronic
S. K. Amizhtan, Stanzin Gyatso, Ramanujam Sarathi, Balaji Srinivasan, Bannur Nanjunda Shivananju
Summary: Early detection of corona discharge using two-dimensional material coated fluorescent fiber is explored in this study. The use of Molybdenum disulphide (MoS2) material as coating enhances the detection efficiency and energy content of the discharge signal. The discharge is observed at the peak of the applied AC voltage according to phase resolved partial discharge studies.
IEEE SENSORS LETTERS
(2023)
Review
Energy & Fuels
Arputhasamy Joseph Amalanathan, Ramanujam Sarathi, Maciej Zdanowski
Summary: This paper examines the impact of nanoparticles on ester fluids in power transformers, focusing on their usage, preparation methodologies, stability, electrical double layer formation, and partial discharge detection. It also discusses the breakdown mechanism, flow behavior, permittivity, physio-chemical properties, thermal conductivity, and aging of nanofluids. The study highlights the need for a better understanding of specific nanoparticles before implementing them in real-time transformers.
Article
Energy & Fuels
R. Bharathi Raja, Anusha C. Halageri, R. Sankar, Ramanujam Sarathi, Ravikrishnan Vinu
Summary: This study investigates the use of non-thermal plasma in a swirl-induced electrode discharge reactor for the dry reforming of methane. The reactor design promotes better mixing of reactant gases, leading to increased conversion rates. The study examines the effect of flow rates and compositions of CO2/CH4 on conversion, and analyzes the characteristics of the produced syngas and solid carbon. The findings show that higher concentrations of CO2 or CH4 result in increased conversion, while increasing flow rates reduce energy costs.
Article
Engineering, Electrical & Electronic
Ashwin Desai Belaguppa Manjunath, Noureddine Harid, Huw Griffiths, Ricardo Pereira Nogueira, Nurym Noyanbayev, Abderrahmane Haddad, Sarathi Ramanujam
Summary: This study proposes two suitable models to represent the conduction behavior of electrolytes and soils, and verifies and analyzes the models using experimental data. The models accurately describe the impedance characteristics of electrolytes and soils, and help to understand the impact of EEI effect at low frequencies and the intrinsic characteristics of the test medium at high frequencies.
IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY
(2023)
Article
Materials Science, Composites
B. Thangabalan, R. Sarathi, N. Harid, H. Griffiths
Summary: The effect of corona aging on the surface potential dynamics and charge trap characteristics of silicone rubber alumina nanocomposite was investigated. The addition of alumina filler increased the surface potential decay time and maximum trap energy. Corona aging led to a reduction in trap depth, and the addition of alumina filler limited the degradation and change in charge trap distribution. An analysis of space charge behavior and comparison of different nanocomposites were presented. Based on the results obtained using the pulsed electro-acoustic technique (PEA), it was concluded that the concentration of space charge and enhancement in the electric field increased with aging duration, with the highest values observed in the case of 60 min corona-aged pure silicone rubber. The recovery of trap distribution after corona discharges was faster for the virgin sample and slower for the sample with 5 wt% alumina.
POLYMER COMPOSITES
(2023)
Article
Engineering, Electrical & Electronic
S. K. Amizhtan, R. Sarathi, Hans Edin, Nathaniel Taylor
Summary: This work investigates the impact of oil reclamation on the conduction mechanism and dielectric properties of thermally aged transformer mineral oil. The study shows that reclamation treatment improves the corona inception voltage and decreases the loss factor and electrical conductivity. Additionally, it is found that reclamation reduces the ionic mobility, conductivity, ionic radius, and concentration of ions in the oil.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2023)
Article
Engineering, Electrical & Electronic
Shufali Ashraf Wani, Anjali Murugan, R. Sarathi, Venkatachalam Subramanian
Summary: A high-frequency sensor-based system is proposed to evaluate transformer insulation degradation by measuring moisture concentration. The system uses an intelligent open-ended coaxial probe microwave technique to accurately characterize the dielectric properties with an optimized artificial neural network (ANN) model. Redundant feature elimination reduces computational burden and eliminates the need for repeated calibration in the conventional technique. The introduced intelligent standardization procedure achieves a low error in moisture measurement (<+/- 3%) with a sensitivity of 0.027/ppm. This simple and fast method is suitable for transformer condition monitoring due to its advantage of high-speed measurement and low error.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Yugandhara Rao Yadam, Sarathi Ramanujam, Kavitha Arunachalam
Summary: The polarization sensitivity of an ultrahigh-frequency (UHF) sensor for detecting partial discharge (PD) activity in gas insulated switchgear (GIS) was studied using a tapered planar spiral (TPS) antenna. The TPS antenna was optimized for circular polarization (CP) over the frequency range of 0.5-3.5 GHz. Compared to a linearly polarized (LP) UHF antenna, the TPS antenna showed stronger polarization sensitivity for detecting PDs in the GIS.
IEEE SENSORS JOURNAL
(2023)
Review
Energy & Fuels
Arputhasamy Joseph Amalanathan, Ramanujam Sarathi, Maciej Zdanowski, Ravikrishnan Vinu, Zbigniew Nadolny
Summary: This paper reviews the gassing tendency of different insulating fluids in transformers and provides precautionary measures for fault diagnosis. Experimental techniques for identifying gassing due to electrical and thermal stress, as well as stray gassing phenomenon, are explained. Interpretation schemes based on historical data of mineral oil may lead to unexpected errors for alternative fluids. Mineral oil and natural ester have positive gassing tendency, while synthetic ester exhibits negative gassing tendency. Stray gases are mostly caused by C-C bond breakage at normal operating temperature. Hydrogen and ethylene are predominantly formed at lower temperatures. Silicone oil and ester fluids are more stable and produce less gassing compared to mineral oil under simulated hot spots. Additives, oxygen, and water content in insulating fluids can confuse the identification of actual faults. Regeneration of insulating fluids using adsorbents reduces gassing tendency depending on the number of cycles.
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
