Article
Materials Science, Ceramics
Muhammad Zarrar Khan, Iftikhar Hussain Gul, Farooq A. Tahir
Summary: Ba-Sr hexaferrite nanoparticles were synthesized using Sol-Gel auto combustion, and their composites with MWCNTs and conductive polymers were synthesized using carrier fluid ultra-sonication dispersion and in-situ polymerization. Structural investigations were conducted to analyze the samples. The results showed good energy dissipation behavior and decreased magnetism in the composites due to weakened exchange coupling or domain wall pinning. The microwave absorption of the samples was evaluated, and the maximum total shielding effectiveness was observed at resonant frequencies relevant to military radars.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Nyathani Maramu, D. Ravinder, T. Anil Babu, M. Srinivas, B. Ravinder Reddy, G. Sriramulu, Katlakuntla Sadhana, N. V. Krishna Prasad
Summary: A series of silver-doped strontium hexaferrite were synthesized by the Co-precipitation method, and their crystal structure, morphology, and microwave absorption properties were studied. The results showed that the lattice parameters increased and grain size decreased with the increase of Ag doping, leading to improved microwave absorption properties in X-band frequencies. The study confirmed the nature of microwave absorption for Ag-doped strontium hexaferrite.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Sachin Kumar Godara, Sher Singh Meena, Rohit Jasrotia, Jyoti Prakash, Ankit Verma, Ranjit Singh, A. K. Srivastava, Mandeep Singh, Pradip K. Maji, Ankit Jain, Ashwani Kumar Sood, Jahangeer Ahmed, Saad M. Alshehri, Amir Mehtab, Tokeer Ahmad, Aslam Hossain, Abhishek Kandwal
Summary: In this study, M-type hexaferrites Ba0.5Ca0.5ZnxZrxFe12-2xO19 were fabricated using the sol-gel technique. The exchange of Fe3+ ions by Zn2+-Zr4+ ions was confirmed by powder X-ray diffraction patterns. The lattice parameters 'a' and 'c' increased as the doping level increased. Scanning electron microscopy images showed a slight decrease in grain size with doping. The highest saturation magnetization was observed for the x = 0.2 configuration. The coercivity decreased significantly with Zn2+-Zr4+ doping. Mossbauer spectra revealed the preferential site occupancy by dopant ions and the ionic state of Fe-ions.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Mariya P. Aleksandrova, Svetozar K. Andreev
Summary: This paper includes the design considerations and basic equations related to thick-film screen-printed sensing devices. The operational frequency, noise voltage, quality factor, and other key parameters of resistive, capacitive, and surface acoustic wave based sensors are determined by considering the device's geometry and the patterns of the functional sensing film or electrodes. The paper also provides information on parasitic components and possible errors. The focus is on meander and comb-shaped coating patterns, which are widely used in this technology.
IEEE SENSORS JOURNAL
(2022)
Article
Physics, Multidisciplinary
Seyed Mahmood Tabatabaei Fard, Mahmood Moradi, Mohammad Mehdi Golshan
Summary: Substituting various concentrations of Ti, Mn, and Zn for the ferric cation in M-type Ba-hexaferrite, this study synthesized BaTi2xMnxZnxFe12-4xO19/MWCNT nanocomposites through modified sol-gel auto-combustion synthesis. The successful substitution of cations in the hexagonal lattice structure was confirmed, and the nanocomposites showed appropriate microwave absorption properties. These developed nanocomposites are recommended for use in equipment where thickness and weight of the absorbing material are important.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Environmental Sciences
Sandhya Mishra, Sushma Kumari, Prashant Kumar, Sujoy Kumar Samanta
Summary: Microwave catalysis is highly lucrative due to its ability for prompt mineralization and superior efficiency. Strontium hexaferrite 2D sheets have been explored as effective catalysts for the degradation of organic dyes and antibiotics. The research suggests the emergence of microwave catalysis as a new technology.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Materials Science, Ceramics
Sungjoon Choi, Jae-Hyoung You, Chris Yeajoon Bon, Seung-young Park, Sang-Im Yoo
Summary: Enhanced microwave absorption properties were achieved in SrFe2-xZnxF hexaferrite filler-epoxy resin matrix composites. Partially Zn-substituted composites showed the best performance in the 3.4-3.8 GHz and 5.9-7.1 GHz ranges.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
S. Shooshtary Veisi, M. Yousefi, M. M. Amini, A. R. Shakeri, M. Bagherzadeh, S. S. Seyed Afghahi
Summary: The study synthesized Cu/Zr-doped barium strontium hexaferrite/poly (O-toluidine) nanocomposites through in-situ polymerization, demonstrating their excellent electromagnetic shielding properties. Various analyses confirmed the structure and performance of the newly synthesized nanocomposites.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Yilei Zhang, Zhengang Lu, Jiubin Tan
Summary: Designing an ultra-thin microwave absorber with tunable absorption and broadband optical transparency is a challenging task. This work presents a visible-infrared transparent ultra-thin frequency-tunable microwave absorber based on a nanometer-thick patterned vanadium dioxide (VO2) film. The absorber achieves a thermally peak absorption frequency modulation range of 15.42-12.99GHz, while having an ultra-thin thickness of only 0.071 of the central wavelength in this range. Additionally, the absorber exhibits high optical transparency from 380 to 6000 nm, making it suitable for various optical and intelligent platform applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Ceramics
Ngo Tran, Ruey-Bin Yang, Woo Hyun Jeong, Do Hung Manh, The-Long Phan, Bo Wha Lee
Summary: This study investigated the application of La-substituted barium hexaferrite in microwave absorption performance. The experimental results showed that doping with different concentrations of La can tune the magnetic properties and microwave absorption features of the material.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Max Ho, Srinivas P. M. Nagaraja, Rustu Umut Tok, Aysan Rangchian, Pirouz Kavehpour, Yuanxun Ethan Wang, Rob Candler
Summary: Millimeter-wave components often use magnetic fields to provide unidirectional signal transmission, but face difficulties in miniaturization. Hexaferrite materials are selected for their strong magnetocrystalline anisotropy (MCA) and low conductance, but integrating them with semiconductor substrates is challenging. Additive manufacturing using a composite of strontium hexaferrite particles and photoresist has been developed to overcome this challenge. The 3-D printed composite has demonstrated magnetic anisotropy, and the self-biasing field has been experimentally characterized.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Materials Science, Ceramics
Shivanshu Goel, Avesh Garg, Himangshu Bhusan Baskey, Sachin Tyagi
Summary: Low-density composites based on carbon black and barium hexaferrite were synthesized for microwave absorption, with the addition of carbon black enhancing electrical properties while increasing dielectric loss tangent. The composite containing 80% CB and 20% BaFe12O19 exhibited excellent microwave absorption properties with low reflection loss and wide bandwidth, attributed to increased dielectric properties leading to better impedance matching.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Xiaohu Ren, Xilou Pu, Hongfeng Yin, Yun Tang, Hudie Yuan, Huiqing Fan
Summary: By coating conductive polymer PANI on the surface of hexaferrite, the electromagnetic loss can be greatly enhanced, leading to improved microwave absorption capacity. The PANI@hexaferrite composite exhibited excellent absorption performance at various thicknesses, showing potential for extensive applications as microwave absorbers.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
P. T. Tho, C. T. A. Xuan, N. Tran, N. Q. Tuan, W. H. Jeong, S. W. Kim, T. Q. Dat, V. D. Nguyen, T. N. Bach, T. D. Thanh, D. T. Khan, B. W. Lee
Summary: Cu, Co, and Ti elements were co-doped to SrFe12O19, and it was found that the microwave absorption performance of SrFe12O19 can be significantly improved through co-doping. All samples showed good microwave absorption performance in terms of reflection loss and effective absorption bandwidth, with one sample exhibiting the ability to cover multiple microwave frequency bands.
CERAMICS INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Nurshahiera Rosdi, Raba'ah Syahidah Azis, Ismayadi Ismail, Nurhidayaty Mokhtar, Muhammad Misbah Muhammad Zulkimi, Muhammad Syazwan Mustaffa
Summary: The study demonstrates that the hybrid of spiraled multiwalled carbon nanotubes and barium hexaferrite nanoparticles exhibits excellent microwave absorption properties, making it a promising microwave absorber for applications in X and Ku bands.
SCIENTIFIC REPORTS
(2021)
Article
Polymer Science
Gopal Kulkarni, Priyanka Kandesar, Ninad Velhal, Haekyoung Kim, Vijaya Puri
Summary: The study successfully synthesized coral cauliflower-like polypyrrole (PPy) hemispheres on an alumina substrate, which show excellent microwave absorption ability. The PPy thin film deposited at specific concentration exhibits strong absorption of electromagnetic radiation and can enhance the absorption characteristics of EM waves in a broad frequency region.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Energy & Fuels
Adhila T. K., Nasima Khatun, Somnath C. Roy, Harish C. Barshilia
Summary: The experimental results demonstrate that slanted, kinked, and straight silicon nanowire arrays create a broadband omnidirectional light-harvesting structure, with slanted and kinked nanowires having better light trapping capabilities than straight ones. By manipulating the geometrical parameters, the light absorption in these nanowires can be enhanced. P-type SiNWs exhibit less reflection than n-type SiNWs, making them promising materials for photoelectrochemical water splitting applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Green & Sustainable Science & Technology
Deepanjana Adak, Raghunath Bhattacharyya, Harish C. Barshilia
Summary: Solar energy-based devices require self-cleaning coatings on glass surfaces to maintain performance. Traditional sol-gel processes are suitable for small-scale production, while spray based processes are more cost-effective for large-scale production. The self-cleaning coatings can be hydrophobic or hydrophilic, and selecting the right materials and parameters is important to maintain transparency and reflectivity. This review explores the principles, deposition techniques, performance evaluation, and lifespan of these coatings, as well as recent advances in atmospheric pressure plasma deposition and the use of non-fluorinated polymer materials.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Energy & Fuels
Harish C. Barshilia, R. V. Lakshmi, Parthasarathi Bera, Bharathi Bai J. Basu, G. Srinivas, V. Praveen Kumar, N. T. Manikandanath
Summary: This study describes a hybrid multilayer solar absorber coating and investigates the effect of adding an ormosil passivation layer on its performance. The results show that the ormosil layer improves the stability and thermal stability of the coating, making it suitable for applications such as solar steam generation.
Article
Materials Science, Ceramics
M. A. Yewale, A. A. Jadhavar, R. A. Kadam, N. B. Velhal, Umesh T. Nakate, A. M. Teli, J. C. Shin, L. N. Nguyen, D. K. Shin, N. K. Kaushik
Summary: In this study, manganese oxide nanoparticles were successfully synthesized using hydrothermal method at different pH values. The effect of pH variation on the structural and electrochemical properties of the synthesized nanoparticles was investigated. The results showed that the manganese oxide electrode prepared at pH 11 exhibited high specific capacitance and low resistance, indicating its potential application in supercapacitors.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
Harish C. Barshilia, K. Niranjan, G. Srinivas, Siju John, N. T. Manikandanath
Summary: The study has developed a multilayer solar selective coating that maintains high absorption and low thermal emittance at high temperatures, suitable for CSP applications. The unique coating design enhances thermal stability and is suitable for evacuated receiver tubes in concentrated solar power plants.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Materials Science, Ceramics
Ninad B. Velhal, Tae Ho Yun, Junhyuck Ahn, Taewook Kim, Jisoo Kim, Changyong Yim
Summary: Different micro- and nanostructures of cobalt oxide are grown on Ni foam using surface-modifying agents via a simple one-pot hydrothermal synthesis process. The electrochemical measurements demonstrate that the dandelion flower-like morphology obtained via CTAB delivers the highest specific capacitance. The surface modification of Co3O4 material improved the charge storage performance of the electrodes for supercapacitor applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Sharon J. Paul, Indu Elizabeth, Shubhda Srivastava, Jai S. Tawale, Prakash Chandra, Harish C. Barshilia, Bipin K. Gupta
Summary: This article presents a novel and simple design of a wearable epidermal sensor that can detect and differentiate various stimuli and human movements, and has the potential for real-time health monitoring. The sensor demonstrates high sensitivity, durability, and fast response time, meeting the requirements of wearable electronics and electronic skin.
Article
Materials Science, Multidisciplinary
Arunchandran Chenan, J. Jyothymol, S. Abirami, Venkataramana Bonu, Harish C. Barshilia
Summary: The corrosion resistance properties of Ti/TiN and TiAl/TiAlN nanolayered multilayered coatings deposited on Ti6Al4V alloy substrates were investigated. The coatings had a bi-layer thickness of approximately 3.5 nm/4 nm and a total thickness of approximately 9 μm. Electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion properties of the coatings immersed in 3.5 wt% NaCl solution for 30 days. The EIS investigation revealed that corrosion occurred due to the penetration of electrolyte and oxygen through the micro/nanopores present in the coatings. It was found that the TiAl/TiAlN coating offered superior corrosion protection compared to the Ti/TiN coating during the immersion study. Potentiodynamic polarization studies showed that both coatings exhibited passive behavior, with the formation of a passive film enhancing the barrier properties and providing anodic protection to the underlying alloy.
Review
Materials Science, Multidisciplinary
Venkataramana Bonu, Harish C. Barshilia
Summary: This paper provides a detailed overview of the effect of temperature on the solid particle erosion process and different types of erosion-resistant coatings developed for gas turbine compressor blades over the last four decades. The paper discusses erosion mechanisms, erosion by different erodent media, and the influence of erosion on gas turbine engines. It also examines the erosion rate trend with increasing temperature for different materials and the role of oxidation and bonding nature in high-temperature erosion.
Article
Energy & Fuels
Shrirang M. M. Pathak, V. Praveen Kumar, Venkataramana Bonu, Leon Mishnaevsky Jr, R. V. Lakshmi, Parthasarathi Bera, Harish C. C. Barshilia
Summary: Wind energy is considered a clean energy source and efforts are being made to protect wind turbine blades from erosion caused by various factors. It is also important to address the waste produced in turbine fabrication and end-of-life phases. In this study, cellulose microparticles and microfibers were used to reinforce water-based polyurethane coatings, resulting in improved erosion resistance.
Article
Nanoscience & Nanotechnology
Ramarajan Ramanathan, Selvakumar Nagarajan, Venkataramana Bonu, Priyanka Patel, Shubhangi Jamdar, Harish C. Barshilia, Ramesh Chandra Mallik
Summary: Thin film technology offers possibilities and advancements in gas sensor devices. Sb-doped nanometer thin-SnO2 films were developed for CO/NH3 gas detection. The structural, surface, optical, and resistivity properties were investigated as a function of film thickness. ATO thin films showed enhanced response towards CO/NH3 gas detection with better stability and selectivity for CO gas. The results indicate the potential application of nanometer ATO films for enhanced gas detection.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
S. Silpa, G. Srinivas, Arup Biswas, Harish C. Barshilia, Vinayak B. Kamble
Summary: Tapping the potential of solar thermal energy requires spectrally selective solar absorber coatings, which lead to high photothermal efficiency. Micro-cavities are known to dramatically enhance or suppress light absorption and emission in a directional manner and are used in nanophotonics, photodetectors, lasing, etc.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Ninad B. Velhal, Junhyuck Ahn, Tae Ho Yun, Taewook Kim, Minsu Gu, Jisoo Kim, Changyong Yim
Summary: In this study, a cobalt oxide (Co3O4) supercapacitor electrode was prepared using ultrafast annealing, leading to enhanced supercapacitive performance. The resulting Co3O4 material exhibited a coral reef-like morphology with a high surface area and a melted ice-like structure. The improved performance of the ultrafast annealed Co3O4 was attributed to its pseudocapacitive nature, unique morphology, and excellent cyclic stability. Assembled hybrid asymmetric supercapacitors showed a specific capacitance of 128.13 F/g with excellent retention capability over 5000 charge-discharge cycles.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Deepanjana Adak, Poulami Mondal, Raghunath Bhattacharyya, Sandip Bysakh, Harish C. Barshilia
Summary: In this study, a durable superhydrophilic coating with photocatalytic and anti-reflecting properties was successfully prepared by sol-gel-based block copolymers assisted evaporation-induced self-assembly (EISA) method. The coating showed outstanding mechanical durability, good water contact angle, photo-catalytic capabilities, improved optical transmittance, and reduced refractive index value.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
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)
