Article
Materials Science, Multidisciplinary
Shaowei Wang, Zhanyong Zhao, Peikang Bai, Wenbo Du, Liang Li
Summary: The graphene/Ti6Al4V composite prepared by selective laser melting showed that the addition of graphene significantly affected the microstructure of the composite, resulting in a finer internal structure and strong interface bonding between TiC and alpha-Ti.
Article
Automation & Control Systems
Abbas A. Khalaf
Summary: This study investigates the possibility of changing the dendritic microstructure associated with conventional casting processes of hypoeutectic Al-Si alloys to non-dendritic microstructure using the controlled diffusion solidification process (CDS). Experimental and simulation work were conducted to examine the effect of precursor alloy content and superheat conditions on changing the microstructure. The results show that mixing pure aluminum with hypereutectic alloy can change the microstructure of hypoeutectic alloys, and a higher mass ratio is preferred. Additionally, successful changes in the microstructure were observed using the CDS process with the Al-Cu system.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
H. T. Jeong, H. K. Park, W. J. Kim
Summary: The deformation mechanisms and microstructural evolution of an Al0.7CoCrFeMnNi high-entropy alloy composed of dual phases have been studied, with results indicating that the most effective grain refinement can be achieved from a eutectic microstructure under specific deformation conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Zhanghua Gan, Zhikui Hu, Yin Su, Yi Liu, Qian Ni, Yingyu Li, Chuandong Wu, Jing Liu
Summary: The study demonstrated that under the influence of super-gravity field, the distribution of eutectic Si in Al-14.55i alloys became more homogeneous, resulting in refinement of the eutectic structure and enhancement of mechanical properties. However, higher super-gravity coefficients could lead to the formation of iron-rich phases, consequently reducing the elongation of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Soban Muddassir Dar, Hengcheng Liao, Aiqun Xu
Summary: This study found that Fe plays a key role in stabilizing the I-phase in conventionally cast Al-Cu-Mn alloys, but does not participate in its transformation to the D-phase and T-Al20Cu2Mn3 phase.
Article
Chemistry, Physical
Daria Drozdenko, Klaudia Fekete, Patrik Dobron, Gergely Nemeth, Jozef Vesely, Soya Nishimoto, Michiaki Yamasaki, Yoshihito Kawamura
Summary: This paper investigates the influence of alloying elements (Y, Gd, and Nd) on the microstructure and anisotropy of mechanical properties in Mg-Zn-based alloys prepared by the rapidly solidified ribbon consolidation technique. The material processing leads to the formation of a microstructure consisting of ultrafine dynamically recrystallized (DRX) alpha-Mg grains and worked non-DRX grains. The small average grain size and weak overall texture result in relatively high yield strength and moderate elongation during both tensile and compressive loading, with a reverse tension-compression yield asymmetry achieved in the investigated alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Tao Liu, Ji-Bing Sun, Jun He, Jun Zhou, Zheng-Yan Zhang, Wei-Dong Shi
Summary: In this study, the effect of a new multi-element V-Fe-Ti-Nb-C-Zr-B ribbon inoculant on the microstructure and mechanical properties of high chromium cast iron (HCCI) was investigated. It was found that the inoculant influenced the morphology and size of M7C3 carbides in the melt and can refine the alloy microstructure and enhance its hardness by altering grain size and reducing carbide formation in the as-cast alloy. Moreover, the heat-treated alloy showed improvements in impact toughness, friction coefficient, and wear loss.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
M. S. Chang, M. A. A. Mohd Salleh, D. S. C. Halin, M. I. I. Ramli, H. Yasuda, K. Nogita
Summary: This paper investigates the effect of minor addition of Ni on the beta-phase evolution in an In-35 wt%Sn alloy during solidification and provides detailed observations of microstructure evolution and thermal properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
C. J. Lin, D. Wang, L. Peng, A. Zois, C. M. Mcgilvery, Q. Li, C. M. Gourlay
Summary: This study investigates the effect and mechanism of carbon inoculation on Mg-Al-based alloys. The results show that carbon inoculation can form multiple carbides, and one of the carbides, T2-Al2MgC2, acts as the heterogeneous nucleant for alpha-Mg. The growth mode and location of the carbides are also influenced by the inoculation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Materials Science, Multidisciplinary
Peng Peng, Anqiao Zhang, Jinmian Yue, Shengyuan Li, Wanchao Zheng, Li Lu
Summary: This study investigated the solidification of Sn-Ni peritectic alloys and found that the peritectic reaction rate is smaller than previous reports, with peritectic phase mainly growing through direct precipitation from the melt. Step growth of both Ni3Sn2 and Ni3Sn4 phases was observed, with the step thicknesses of both phases decreasing as solidification proceeds. Additionally, the normal growth velocity of Ni3Sn4 phase was found to increase with increasing cooling rate.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Danusa Araujo de Moura, Guilherme Lisboa de Gouveia, Leonardo Fernandes Gomes, Jose Eduardo Spinelli
Summary: The impact of varying Ni contents on the microstructural changes of AlSi10Mg alloy was investigated. The interaction between Si and Al3Ni phases in the alloy was found to be crucial for understanding its properties. Alloys modified with different Ni contents were solidified or remelted, and it was observed that higher Ni contents resulted in lower dendritic spacing and increased proportion of Al3Ni phase. The alloys with the best tensile results and improved surface mechanical properties were identified under specific conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
S. Sha, J. Chang, S. S. Xu, P. X. Yan, B. Wei
Summary: In this study, the microstructural dependence of magnetic property for hypereutectic Co62Mo38 alloy was investigated by undercooling the alloy using electromagnetic levitation and drop tube techniques. The results showed that as the undercooling increased, the alloy exhibited significant changes in magnetic properties, with a decrease in saturation magnetization and a reduction in coercive force. At small undercoolings, the alloy consisted mainly of lath-shaped primary epsilon-Co7Mo6 dendrites, while at higher undercoolings, the volume fraction of alpha-Co phase decreased continuously.
Article
Chemistry, Physical
Janusz Kozana, Aldona Garbacz-Klempka, Marcin Piekos, Malgorzata Perek-Nowak, Pawel Palka
Summary: Investigations were conducted on copper-tin alloys with nickel and titanium additions to maintain or improve their properties under limited fractions of critical elements. The presence of titanium reduced columnar crystals and led to precipitation of intermetallic phases in interdendritic regions. Bronze with titanium additions showed increased hardness and decreased elongation, while CuSnNi bronze showed increased hardness and ultimate tensile strength with reduced elongation when 0.2 wt.% titanium was added. Higher titanium additions further increased hardness, slightly decreased tensile strength, and significantly reduced elongation.
Article
Chemistry, Physical
Camila Konno, Clarissa Cruz, Thiago Costa, Andre Barros, Pedro Goulart, Amauri Garcia, Noe Cheung
Summary: This study investigates the quantitative correlations of hydrogen evolution performance with solidification microstructural and thermal parameters in various Al alloys. Results show that hydrogen evolution becomes slower with increased alloy solute content, and the distribution of Sn-rich particles affect hydrogen generation in Al-Sn alloys while coarsening of Al6Fe IMCs fibers favor hydrogen production in Al-Fe alloys. The specific hydrogen production of the Al-1wt.%Fe alloy is higher than other studied alloys under certain solidification conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Chemical
Kevin Huang, Eric S. Elton, Hunter B. Henderson, Norris K. Harward, Evan M. Clarke, Logan D. Winston, Edwin M. Sedillo, Debra L. Rosas, Cherie A. Schaeffer-Cuellar, Scott A. Simpson, Tian T. Li, Nick E. Teslich, Sharon G. Torres, Amy L. DeMint, Jeffrey A. Cook, Joseph T. McKeown, Jason R. Jeffries, Alex V. Hamza, Ryan L. Stillwell
Summary: This study investigates the viability of using the Hydride-Dehydride (HDH) process coupled with plasma spheroidization as an alternative method to atomization for producing U-6 wt.% Nb powders. The HDH process produces irregularly shaped powder with U-Nb segregation and phase heterogeneity, while the subsequent spheroidization process re-homogenizes the composition and phase of the powder. The combination of HDH and plasma spheroidization offers a low-waste production route for spherical U-6 wt.% Nb powders.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Oluwatoyin E. Jegede, Nafisul Haque, Andrew M. Mullis, Robert F. Cochrane
Summary: The metastable monotectic Cu-50 at. % Co alloy processed under micro gravity condition using a drop tube and subjected to differential thermal analysis showed evidence of liquid phase separation due to rapid cooling during arc melt process. In the drop tube samples, the melting temperature of the Cu-rich beta-phase was found to be 1294.8 K, while that of the Co-rich alpha-phase varied with cobalt content.
CANADIAN JOURNAL OF CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
P. C. Bollada, P. K. Jimack, A. M. Mullis
Summary: This paper explores a vertex based approach to faceted anisotropy in phase field modelling of crystal growth, highlighting two distinct methods and advocating for a vertex based approach. Results include regular and irregular morphologies, hill-valley growth, as well as high undercooling effects causing breaks in facets and distortion of underlying Wulff shape in irregular shapes.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
N. Haque, O. E. Jegede, A. M. Mullis
Summary: In this study, drop-tube processing was used to solidify Ni5Ge3 intermetallic compound rapidly, producing powders with different microstructures at varying cooling rates. Transmission electron microscopy analysis revealed the differences in ordered structures under different cooling conditions, highlighting the importance of TEM analysis for determining the degree of ordering in crystalline materials.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Chemistry, Multidisciplinary
Oluwatoyin E. Jegede, Nafisul Haque, Andrew M. Mullis, Robert F. Cochrane
Summary: The liquidus temperature of the arc melted Cu-68.5% Co alloy was close to the phase diagram estimate, but in the drop-tube processed samples, it was much lower due to liquid phase separation and varying compositions of the demixed phases compared to the parent melt.
CANADIAN JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
A. E. Nassar, A. M. Mullis
Summary: Machine learning methods have been used to predict new High-Entropy Alloys, with the neural network model using compositional data performing better, suggesting that abandoning predictive features may be advantageous.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Nafisul Haque, Oluwatoyin Enitan Jegede, Andrew M. Mullis
Summary: The congruently melting, single phase intermetallic Ni5Ge3 has been rapidly solidified via droptube processing to produce powders with different microstructures, including partial plate and lath microstructure and complete plate and lath microstructure embedded in a featureless matrix. Transmission electron microscopy analysis reveals the different forms of Ni5Ge3, with partial plate and lath having a disordered form and plate and lath having an ordered (double-superlattice) form.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Oluwatoyin E. Jegede, Nafisul Haque, Andrew M. Mullis, Robert F. Cochrane
Summary: Cu-50% Co and Cu-68.5% Co metastable monotectic Cu-Co alloys were rapidly solidified under nitrogen atmosphere. Liquid phase separation and dendritic structures were observed. Regression relationship between cooling rate and SDAS measurements was established.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Aerospace
Andrew M. Mullis
Summary: Al-Ni alloys exhibit a unique recrystallization characteristic where the recrystallization velocity decreases as undercooling increases. Samples with surface enrichment in Ni favor this recrystallization process. Analysis of high-speed video data from experiments on the International Space Station reveals anomalous growth in these alloys, suggesting a potential linear relationship between surface Ni enhancement and nucleation temperature.
MICROGRAVITY SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Peter C. Bollada, Peter K. Jimack, Andrew M. Mullis
Summary: This paper provides an overview of contributions made by the University of Leeds in the computational phase-field modelling of alloy solidification. By considering the broader context, this review allows for a better understanding of the significance of individual contributions.
Article
Chemistry, Physical
A. Nassar, A. Mullis, R. Cochrane, Z. Aslam, S. Micklethwaite, L. Cao
Summary: The effect of cooling rate on the dual-phase AlCoCrFeNi2.1 Eutectic High-Entropy Alloy was investigated. The microstructure of AlCoCrFeNi2.1 gradually evolved with increasing cooling rate, and different crystal morphologies were observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Mehmet R. Abul, Robert F. Cochrane, Andrew M. Mullis
Summary: Non-equilibrium container-less solidification of Al-2.85 wt% Fe alloy was investigated. XRD analysis revealed phase evolution during solidification, and SEM and optical microscopy were used to evaluate the microstructure. EDX analysis showed an increase in Fe content in α-Al and a decrease in the eutectic fraction with increasing cooling rate. Measurement of the lamellar spacing allowed calculation of eutectic growth velocity and interfacial undercooling, reconstructing the interface structure of the eutectic region. Additionally, micro hardness measurements indicated an effect of non-equilibrium solidification on the mechanical properties of the material.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Mehmet R. Abul, Robert F. Cochrane, Andrew M. Mullis
Summary: Drop tube atomized Al-3.9 wt% Fe alloy was studied, revealing the presence of divorced eutectic, microcellular α-Al, dendritic α-Al with lamellar interdendritic eutectic, and lamellar and rod-like eutectics in the microstructure. Y-shaped structures composed of nano-sized needle-like and spherical precipitates were observed, affecting the eutectic spacing. The microhardness of the droplets increased with decreasing droplet size, indicating the effect of nonequilibrium solidification on mechanical properties.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Oluwatoyin E. Jegede, Andrew M. Mullis, Robert F. Cochrane
Summary: The particle size distribution and solidification of dispersed Cu-rich particles within the core region of stable core shell microstructures were investigated in drop tube processed metastable Cu-50 at. % Co alloy. The formation of the core shell microstructures is influenced by nucleation and growth phenomenon. Coalescence propelled by collision is favored in smaller droplets with higher cooling rates and subsequent higher degree of undercooling. Weaker Marangoni motion impedes the further convergence of the Cu-rich particles within the core region.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Mehmet R. R. Abul, Robert F. F. Cochrane, Andrew M. M. Mullis, Ahmed Nassar
Summary: The microstructural evolution of Al-4.1wt.% Fe-1.9 wt.% Si alloy powders processed by drop-tube was analysed, revealing the formation of Al8Fe2Si intermetallic. The larger powders exhibited a mixed microstructure of microcellular and dendritic regions with a lamellar interdendritic eutectic, while the smaller powders contained featureless faceted regions in addition to the mixed microstructure. Ultrafine propeller-like structures were observed in the smallest powders, formed from the same featureless material. TEM analysis showed that the featureless material comprised nano-sized faceted Al8Fe2Si crystals in an alpha-Al matrix. The micohardness of the samples increased with decreasing sample size, but later dropped for smaller samples.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Multidisciplinary Sciences
P. C. Bollada, P. K. Jimack, A. M. Mullis
Summary: In this study, phase field was used to simulate hopper crystals, which are characterized by a cubic structure with depressions on each face. Previous simulations have successfully explored dendritic structures formed under high undercooling, but hopper crystals, which are a hybrid between perfect cubes and dendrites, have not been studied. This paper presents a model for faceted cubic growth and explores the results in three dimensions, including perfect cubes, hoppers, and dendrites, as well as briefly mentioning octahedral morphology.
SCIENTIFIC REPORTS
(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)