Article
Chemistry, Physical
Yu Knyazev, D. A. Balaev, S. Stolyar, O. A. Bayukov, R. N. Yaroslavtsev, V. P. Ladygina, D. A. Velikanov, R. S. Iskhakov
Summary: This study investigates the biogenic ferrihydrite nanoparticles and reveals the exceptional magnetic anisotropy formed by the highly developed surface of ferrihydrite nanoparticles. A core-shell structural model of the biogenic ferrihydrite particles is proposed based on Mossbauer data analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Milad Mehdipour, Lucy Gloag, Jiaxin Lian, Richard D. Tilley, J. Justin Gooding
Summary: A new type of gold-coated magnetic nanoparticle with strongly magnetic zero-valent iron core and iron oxide shell was synthesized. The nanoparticles showed stability against magnetic aggregation and good colloidal stability, which is important for many biomedical applications.
CHEMICAL COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
H. Y. Hah, S. Gray, C. E. Johnson, J. A. Johnson, V Kolesnichenko, P. Kucheryavy, G. Goloverda
Summary: Mono-disperse iron oxide nanoparticles synthesized by high-temperature hydrolysis were studied using Mo center dot ssbauer spectroscopy, revealing a critical diameter of around 11 nm for room temperature superparamagnetism. Particles larger than 11.9 nm exhibited ferrimagnetic properties, while particles smaller than 10.6 nm showed superparamagnetism.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Beatrice Muzzi, Martin Albino, Michele Petrecca, Claudia Innocenti, Cesar de Julian Fernandez, Giovanni Bertoni, Clara Marquina, Manuel Ricardo Ibarra, Claudio Sangregorio
Summary: In this study, the effect of dual-doping of Fe-(II) with Co-(II) and Ni-(II) on crystal structure and magnetic properties is investigated. The results show that Ni-Co doped iron oxide core@shell nanoparticles with high coercivity and increased antiferromagnetic ordering transition temperature close to room temperature can be obtained.
Article
Chemistry, Multidisciplinary
Kai Huang, Zhanjun Li, Yang Li, Nuo Yu, Xiuping Gao, Ling Huang, Shuang Fang Lim, Gang Han
Summary: This study introduces a simple thermolysis-mediated colloidal synthesis method for CaF2:DygNaYF(4) core-shell PLNPs, which enhances persistent luminescence. The well-matched crystal lattices between CaF2 and NaYF4 allow for precise control of compositions, shapes, and enhanced luminescence, overcoming current synthesis challenges for heterostructured PLNPs.
Article
Chemistry, Physical
G. B. Oliveira-Filho, J. J. Atoche-Medrano, F. F. H. Aragon, J. C. Mantilla Ochoa, D. G. Pacheco-Salazar, S. W. da Silva, J. A. H. Coaquira
Summary: Core-shell structure Au@Fe3O4 nanoparticles were synthesized using a thermal decomposition method, with a core diameter of approximately 10.5 nm and a shell thickness of roughly 1.85 nm. The nanocomposite exhibited a successful coupling of Au and Fe3O4, possessing good crystal structure and magnetic response characteristics.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Ceramics
Jin Soon Han, Gye Seok An
Summary: A facile method for fabricating carbon-shelled Fe3O4 nanoparticles with a cluster structure at low temperature and atmospheric pressure was proposed. The properties of the obtained Fe3O4@C nanoparticles depended on the terminal amine groups on the iron oxide surface. The effects of silane-and polymer-based amination on the fabrication of the carbon shell were investigated.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Shivanee Borpatra Gohain, Purna Kanta Boruah, Manash Ranjan Das, Ashim Jyoti Thakur
Summary: The encapsulation of iron oxide-based nanoparticles with gold nanoparticles shows promise for catalysis, providing a solution to the hydrophilic surface of iron species and enabling easy separation of colloidal gold nanoparticles. The resulting Fe3O4/Au NPs-rGO structure has been successfully used for synthesizing isatins, potential precursors of SARS-CoV-2 protease inhibitors, and uracil-based spirooxindoles, potential precursors of anti-cancer compounds, under mild reaction conditions with high yields.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
J. Lohr, M. Vasquez Mansilla, M. V. Gerbaldo, M. S. Moreno, D. Tobia, G. F. Goya, E. L. Winkler, R. D. Zysler, E. Lima
Summary: The thermal decomposition of organometallic precursors in the presence of surfactants and a long-chain alcohol is a valuable method to synthesize magnetic nanoparticles with control over morphology and crystallinity. The pre-decomposition step at 373-393 K in inert gas flux plays a crucial role in determining the composition and morphology of the final nanoparticles, such as Fe1-yO/Fe3O4 core-shell structure and 20-25 nm size, versus monophasic MNPs of 11 nm with ferrite structure obtained when skipping this step. The differences in composition significantly affect the resulting magnetic properties of MNPs, which are related to by-reactions in the synthesis solution during preparation.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Anna M. Mills, Joseph Strzalka, Andrea Bernat, Qinchun Rao, Daniel T. Hallinan
Summary: Magnetic-core/gold-shell nanoparticles (MAuNPs) are promising for fast and portable detection of trace adulterants. The gold shell provides biocompatibility and easy functionalization, while the magnetic core allows for analyte concentration and controlled deposition. MAuNPs grafted with both PEG and 4-MBA showed the best performance. The presence of 4-MBA slowed the deposition rate, indicating different NP-substrate interactions. These findings highlight the importance of ligand choice and functionalization in the design of sensing platforms.
Article
Environmental Sciences
Hem Chandra Sharma, Hao Chen, Aneesh Kumar Chandel
Summary: This study investigates the use of modified biochar with iron minerals for the adsorption and degradation of organic contaminants. The results show that the modified biochar has better sorption ability and higher persulfate activation capacity, leading to enhanced removal of the target contaminant.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Infectious Diseases
Cristina Chircov, Maria-Florentina Matei, Ionela Andreea Neacsu, Bogdan Stefan Vasile, Ovidiu-Cristian Oprea, Alexa-Maria Croitoru, Roxana-Doina Trusca, Ecaterina Andronescu, Ionut Sorescu, Florica Barbuceanu
Summary: This study focuses on the development of nanostructured systems based on Fe3O4@SiO2 core-shell nanoparticles and three different types of essential oils to overcome the limitations of essential oils in biomedical applications. By comparing the synthesis methods of Fe3O4@SiO2 core-shell nanoparticles, the impact of the method on nanoparticle formation and properties was studied. The antimicrobial properties of the synthesized nanocomposites were also evaluated for potential applications in antimicrobial therapies.
Article
Chemistry, Multidisciplinary
Andrea Atrei, Fariba Fahmideh Mahdizadeh, Maria Camilla Baratto, Andrea Scala
Summary: The size, size distribution, and magnetic properties of magnetite nanoparticles prepared under different citrate conditions were investigated by XRD, DLS, EPR, and magnetization measurements. Citrate was found to affect the size and magnetic properties of the nanoparticles, with citrate-coated nanoparticles showing greater stability.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Oleg Ovchinnikov, Sergey Aslanov, Mikhail Smirnov, Alexey Perepelitsa, Tamara Kondratenko, Alexandr Selyukov, Irina Grevtseva
Summary: This paper presents studies on the luminescent properties of colloidal Ag2S quantum dots coated with SiO2 shell, analyzing various approaches to SiO2 shell formation. Results show that forming a SiO2 shell can increase the quantum yield of luminescence, with different precursors affecting the quality of the shell.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Engineering, Chemical
Markus Snellman, Namsoon Eom, Maria E. Messing, Knut Deppert, Chris Hogan
Summary: Segregated bimetallic nanoparticles, such as core-shell nanoparticles, have attracted widespread interest in various fields like biomedicine, catalysis, and optoelectronics. Aerosol technology provides an optimal platform for controlling the size, structure, and composition of nanoparticles, which are crucial parameters for tuning the material performance for specific applications. In this study, researchers developed a novel evaporator design that allows on-line coating of core particles with a shell directly in the gas phase. By utilizing a local heater, the researchers were able to decouple the heating process of the evaporating material from the aerosol particles, thereby limiting core-shell alloying. The resulting core-shell particle formation with controllable shell thickness was demonstrated using evaporation of zinc onto core particles of gold, tin, and bismuth. Simple models were also discussed to explain the observed growth process inside the evaporator and the formation of the shell.
JOURNAL OF AEROSOL SCIENCE
(2024)
Review
Chemistry, Physical
Pawanpreet Deeksha, Pawanpreet Kour, Imtiaz Ahmed, Kamlesh Sunny, Surender Kumar Sharma, Kamlesh Yadav, Yogendra Kumar Mishra
Summary: Development of clean and sustainable renewable energy sources is crucial for addressing future energy crises. Noble metals have been used as electrocatalysts to improve efficiency in energy storage/conversion systems, but their high cost and scarcity have driven researchers to explore cost-effective alternatives such as perovskite oxide nanomaterials. This review discusses the importance of perovskite oxide nanomaterials as electrocatalysts for oxygen evolution reaction (OER), including reaction mechanisms and activity descriptors. The article also summarizes experimental instrumentation, parameters, and protocols, as well as recent activation strategies to enhance the electrocatalytic performance of perovskite oxides. The challenges and prospects discussed in this review may lead to the rational design of highly active and stable perovskites as superior alternatives to noble metal-based OER electrocatalysts.
Article
Chemistry, Multidisciplinary
Rafael W. R. Santana, A. E. B. Lima, Luiz K. C. de Souza, Evelyn C. S. Santos, C. C. Santos, A. S. de Menezes, Surender K. Sharma, L. S. Cavalcante, Marcelo E. H. Maia da Costa, T. O. Sales, Carlos Jacinto, G. E. Luz Jr, M. A. P. Almeida
Summary: We synthesized p-BiOBr/n-ZnWO4 heterostructures through a simple hydrothermal/precipitation method, which significantly enhanced the photocatalytic degradation of Rhodamine B (RhB) dye and ciprofloxacin antibiotic. The heterostructures exhibited a mixed tetragonal/monoclinic phase with n-ZnWO4 nanocrystals on the surface of p-BiOBr microcrystals. The unique structure led to improved light absorption and efficient degradation of pollutants.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Analytical
Faheem Ahmed, Ghazzai Almutairi, Prince M. Z. Hasan, Sarish Rehman, Shalendra Kumar, Nagih M. Shaalan, Abdullah Aljaafari, Adil Alshoaibi, Bandar AlOtaibi, Kaffayatullah Khan
Summary: Activated carbon derived from biomass (rice husk) with a certain degree of amorphous carbon structure and spherical morphology was synthesized. The activated carbon showed excellent cyclic reversibility and stability with enhanced electrochemical capacitive performance. This study provides insight into using rice husk for the fabrication of anodes, which could be used for renewable energy storage devices in the future.
Review
Energy & Fuels
Heri Septya Kusuma, Dita Permatasari, Wakhid Khoirul Umar, Sanjay K. K. Sharma
Summary: Natural fiber-reinforced composites, particularly those made from sugarcane bagasse, have gained attention due to their abundance, low processing costs, flexibility, high strength, and environmental friendliness. By utilizing sugarcane bagasse waste, strong and adaptable biocomposites can be developed for various sectors. This renewable composite material supports the production of environmentally friendly materials.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Electrochemistry
Iara A. Monteles, Bruno V. Penha, Weliton S. Fonseca, Leticia M. B. Silva, Evelyn C. S. Santos, Luiz K. C. de Souza, C. C. Santos, A. S. de Menezes, Surender K. Sharma, Yasir Javed, Muhammad R. Khawar, Auro A. Tanaka, Marcio A. P. Almeida
Summary: This study investigates the structural evolution of BiPO4 under different synthesis conditions and explores its electrochemical performance for supercapacitor applications. The addition of different templates (CTAB, SDS) results in a hexagonal structure, while the addition of EG leads to a mixed structure of both the hexagonal and monoclinic phases. Raman spectra confirms the presence of the mixed phase and electron microscopy reveals the influence of templates on the morphology of the synthesized materials. The BiPO4-EG mixed structure exhibits the highest specific capacity, good capacitance retention at high current densities, and the lowest electrochemical series resistance.
JOURNAL OF APPLIED ELECTROCHEMISTRY
(2023)
Retraction
Engineering, Electrical & Electronic
Muhammad Ikram, Muhammad M. Sajid, Yasir Javed, Amir M. Afzal, Naveed A. Shad, Moon Sajid, Kanwal Akhtar, Muhammad Imran Yousaf, Surender Kumar Sharma, Hasnat Aslam, Tousif Hussain, Dilshad Hussain, Aamir Razaq
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chandni Kumari, J. Manam, S. K. Sharma
Summary: Intense red-emitting double perovskite Sr3LiSbO6 (SLSO) phosphor materials doped with Eu3+ rare earth ion were prepared using a solid-state reaction. The obtained sample displayed a hexagonal structure with space group R3c. The optical band gap of SLSO: 2%Eu3+ was found to be 3.42eV, lower than that of pure SLSO (3.5eV), exhibiting a negative Burstein Moss effect. Concentration quenching effect was observed in the photoluminescence emission spectra beyond 2mol% Eu3+ doping concentration, indicating dipole-dipole interaction. The prepared phosphor had an average decay time of 808.6 mu s. Photometric studies showed low correlated color temperature (CCT) values (<1900K) with high color purity (CP) of 99% and Commission International de'Eclairage (CIE) coordinates in the red region. These results suggest that the proposed phosphor could be a promising strong red-emitting phosphor for white light-emitting diodes (wLED) based on UV or blue chip.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Navadeep Shrivastava, Carlos Ospina, Carlos Jacinto, Alan S. de Menezes, Diego Muraca, Yasir Javed, Marcelo Knobel, Zhiping Luo, Surender Kumar Sharma
Summary: A robust yellowish-green emitting multi core-shell Fe3O4@SiO2@beta-NaGdF4:RE3+ (RE=5% Ce, 5% Tb, x% Dy; x=1, 5 and 10 mol.%) nanoparticles (NPs) containing magnetic and luminescence properties were synthesized using a microwave-assisted hydrothermal method. The photoluminescence investigation revealed a down-converting energy transfer process involving Ce3+->Gd3+->Tb3+<->Dy3+ with Gd3+ playing an important intermediate role assisted by Tb3+. The magnetic hysteresis loops displayed superparamagnetic behavior at 300 K and ferromagnetic ordering at 2 K.
Article
Materials Science, Multidisciplinary
Alana O. C. Andrade, Luis Henrique da Silveira Lacerdab, M. M. Lage, Surender K. Sharma, M. E. H. Maia da Costa, Odivaldo C. Alves, Evelyn C. S. Santos, C. C. dos Santos, A. S. de Menezes, Miguel Angel San-Miguel, Francisco Moura Filho, Elson Longo, Marcio A. P. Almeidaj
Summary: We successfully fabricated a BiOBr/ZnWO4 heterojunction and found it to have enhanced photocatalytic performance for degrading Rhodamine B dye. Structural and microstructural analysis showed that the heterostructures consist of a mixed tetragonal/monoclinic phase with enhanced surface area. The results indicated that the BiOBr/ZnWO4 heterostructure had a higher degradation rate compared to BiOBr due to higher surface area, pore size, and better electron-hole pair separation efficiency.
Article
Multidisciplinary Sciences
Sandeep Kumar, Surender Kumar Sharma, Anil Kumar Dhaka, Sandeep Bedwal, Seema Sheoran, Ram Swaroop Meena, Chetan Kumar Jangir, Dinesh Kumar, Rakesh Kumar, Ram Dhan Jat, Ajit Kumar Meena, Ahmed Gaber, Akbar Hossain
Summary: Various faulty farming practices and low-performance cultivars selection are reducing crop yields, factor productivity, and soil fertility. Therefore, efficient nutrient management and selecting nutrient-responsive cultivars are needed to achieve better productivity, seed quality, nutrient efficiency, and soil nutrient dynamics. The study showed that the lentil cultivar HM-1 performed significantly better than Sapna and Garima in terms of seed yield and nutrient uptake, as well as partial factor productivity, partial nutrient balance, and internal utilisation efficiency. It was found that 50% of the recommended fertilizer dose could be substituted with organic manures without compromising crop productivity and soil fertility when growing the HM-1 cultivar, thereby sustaining soil-human-environment health.
Article
Chemistry, Physical
Shalendra Kumar, Faheem Ahmed, Nagih M. M. Shaalan, Nishat Arshi, Saurabh Dalela, Keun Hwa Chae
Summary: Magnetic nanoparticles of NiFe2O4 were successfully synthesized using sol-gel techniques. The nanoparticles were characterized using various techniques, including X-ray diffraction, transmission electron microscopy, dielectric spectroscopy, magnetization measurements, and electrochemical studies. The results showed that the nanoparticles possessed single-phase nature with face-centred cubic crystalline structure. The average particle size was around 10 nm, and they exhibited ferromagnetic behavior. The nanoparticles also showed high dielectric constant and potential for application in supercapacitors.
Article
Chemistry, Physical
Shalendra Kumar, Faheem Ahmed, Nagih M. Shaalan, Nishat Arshi, Saurabh Dalela, Keun H. Chae
Summary: CeXO2 (X: Fe, Mn) nanoparticles were synthesized and characterized for their structural, morphological, magnetic, and electrochemical properties. XRD, FE-TEM, dc magnetization, Raman analysis, and NEXAFS analysis confirmed the successful incorporation of Fe and Mn in CeO2 matrix and the formation of FCC fluorite structure. The Fe-doped CeO2 showed the lowest band gap and enhanced room temperature ferromagnetism. Ce0.95Fe0.05O2 electrode exhibited excellent electrochemical performance for energy storage devices.
Article
Chemistry, Inorganic & Nuclear
Nagih M. Shaalan, Faheem Ahmed, Shalendra Kumar, Mohamad M. Ahmad, Abdullah F. Al-Naim, D. Hamad
Summary: This paper reports the use of a low-concentration active electrolyte, KBrO3, for supercapacitor applications. The electrochemical processes were conducted using two concentrations of KBrO3, 0.2 M and 0.4 M. Additionally, a novel strategy for doping graphene with KBr during its fabrication process is presented. This chemical doping improves the electrochemical properties of graphene for use as supercapacitors.
Article
Chemistry, Inorganic & Nuclear
Abdullah Aljaafari, Faheem Ahmed, Nagih M. Shaalan, Shalendra Kumar, Abdullah Alsulami
Summary: This work presents the deposition of titanium nitride (TiN) thin film and its application as a diffusion barrier for copper interconnect using the DC sputtering technique. The deposited film was analyzed using XRD, FESEM, and XPS techniques. The TiN film exhibited a face-centered cubic structure and uniform grain dispersion. The TiN film showed high thermal stability, low resistivity, and excellent performance as a diffusion barrier up to 700 degrees C. However, at higher annealing temperatures, the formation of Cu3Si and TiSi2 compounds was observed.
Article
Materials Science, Multidisciplinary
Kavita Kumari, Akshay Kumar, Su-Jeong Park, Naveen Yadav, Manish Kumar, Shalendra Kumar, Seok-Hwan Huh, Jong-Woo Kim, Bon-Heun Koo
Summary: One-dimensional SmCo/Co magnetic nanocomposites with varying reaction times were prepared through magnetically-assisted chemical reduction method. The samples exhibited different phase compositions and magnetic properties. The nanocomposite SC5 showed the highest aspect ratio, smallest crystallite size, and highest lattice strain. The magnetic response of the samples was greatly influenced by the reaction time, with SC5 showing the highest saturation magnetization and effective magnetic anisotropy. Spin-orbit coupling played a crucial role in determining the magnetic anisotropy, which was highest in SC5. The enhanced magnetic properties of the nanocomposites were attributed to the high fraction of magnetic phases and coupling between multiple phases.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
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)
