Article
Nanoscience & Nanotechnology
Arpan Arora, Suhrit Mula
Summary: In this study, different oxide dispersion strengthened (ODS) steel compositions were prepared using Fe-42wt% Ni invar as the base material. The mechanical properties and thermal stability of the mechanically alloyed and annealed samples were evaluated. Spark plasma sintering was used to further investigate the sintering characteristics, microstructure, and mechanical properties. The theoretically calculated yield strength values were compared with experimentally determined compressive yield strength. The relationship between microstructure and mechanical properties was examined in the context of various strengthening processes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Crystallography
Hany S. Abdo, Asiful H. Seikh, Ahmed Fouly, Sameh A. Ragab
Summary: Al-10Zn-TiC nanocomposite powders were prepared by mechanical alloying with varying reinforcement content, and bulk samples with 10 wt% TiC reinforcement showed a grain size of 17 +/- 08 μm and improved load carrying ability. Microscopic analysis confirmed the presence and distribution of reinforced nanoparticles in the Al matrix, with XRD results showing TiC formation, SEM analysis revealing uniform distribution of particles, and TEM showing clear interface between matrix and TiC nanoparticles. Mechanical properties testing indicated higher strength in nanocomposites due to multiple strengthening mechanisms from nanoscale TiC addition.
Article
Nanoscience & Nanotechnology
Niraj Chawake, Lavanya Raman, Parthiban Ramasamy, Pradipta Ghosh, Florian Spieckermann, Christoph Gammer, B. S. Murty, Ravi Sankar Kottada, Juergen Eckert
Summary: This study synthesized a composite of two different medium entropy alloys using ball milling and spark plasma sintering, showing excellent microstructural and phase stability as well as multiple desirable mechanical properties. The results can serve as a template for other systems and demonstrate the feasibility of combining different medium entropy alloys.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Jun Zhou, Hengcheng Liao, Hao Chen, Aijing Huang
Summary: A non-equiatomic high entropy alloy was successfully synthesized by mechanical alloying plus spark plasma sintering, showing higher compression yield strength and smaller grain size than alloys prepared by arc-melting method. This is mainly attributed to the combined effects of dislocation hardening, fine grain strengthening and precipitation hardening of second phase particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Abbas Sabahi Namini, Seyed Ali Delbari, Yeonju Oh, Mehdi Shahedi Asl, Quyet Van Le, Joo Hwan Cha, Sea-Hoon Lee, Ho Won Jang, Heung Nam Han, Mohammadreza Shokouhimehr
Summary: The study investigated the effect of TiCN on the microstructure development of fully dense ZrB2-based ceramics sintered using spark plasma sintering. The formation of (Zr,Ti)B-2 and ZrCN phases was observed in the final microstructures, indicating a chemical reaction between TiCN and ZrB2. The (Zr,Ti)B-2 matrix in the ternary system exhibited a Vickers hardness of 29.3 GPa and an elastic modulus of 450.8 GPa, with a roughly uniform composition facilitated by SiC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
S. B. Aleman-Cordova, L. Ceja-Cardenas, J. C. Mendez-Garcia, S. Diaz-de La Torre
Summary: The simultaneous extrusion and sintering of ceramic materials using the spark plasma extrusion (SPE) technique with Y2O3 and Al2O3 additives was studied, showing significant impact on the sinter-extrusion process. The maximum degree of extrusion was achieved when the total amount of additives reached 20 wt% (SN-20 series).
CERAMICS INTERNATIONAL
(2021)
Article
Metallurgy & Metallurgical Engineering
Peng Zhang, Boyang Xu, Jianquan Zhao, Shengming Yin, Youwei Yan, Mi Zhao
Summary: Mechanical alloying (MA) is used to prepare two types of ODS ferritic alloys, labeled A and B, for potential use in fusion reactors. The use of TiO2 powder instead of traditional Y2O3 powder reduces milling time and results in the formation of nanoparticles with coherent interfaces. This study provides a new route for the efficient fabrication of ODS alloys.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Rahul Bhattacharya, Murugesan Annasamy, Pavel Cizek, M. Kamaraj, G. Mohan Muralikrishna, Peter Hodgson, Daniel Fabijanic, B. S. Murty
Summary: Nanocrystalline AlxCoCrFeNi high-entropy alloys were synthesized using mechanical alloying (MA) and consolidated by spark plasma sintering (SPS). The composition and microstructure of the alloys were affected by the Al content and the addition of carbon and oxygen during the milling process, resulting in nanoscale dispersion of carbides and oxides.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Engineering, Chemical
P. S. Ninawe, S. Ganesh, P. Sai Karthik, S. B. Chandrasekhar, R. Vijay
Summary: Austenitic oxide dispersion strengthened (AODS) steel was fabricated using two-stage ball milling and consolidation through spark plasma sintering (SPS). The effect of SPS temperature on density, microstructure, and mechanical properties of the consolidated samples was investigated, demonstrating the best combination of strength and elongation achieved on AODS alloys processed using MA and SPS.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Harsh Jain, Yagnesh Shadangi, Dibyendu Chakravarty, Ashutosh Kumar Dubey, N. K. Mukhopadhyay
Summary: A non-equiatomic high entropy steel was synthesized via mechanical alloying and spark plasma sintering, and it was found to have a metastable dual-phase structure. The spark plasma sintered high entropy steel exhibited excellent mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Jiang Wu, Xuguang An, Jing Zhang, Shaofeng Lei, Yi Guo, Xiwei Xu, Weitang Yao, Qingyuan Wang, Qingquan Kong
Summary: Ti-24Nb-4Zr-3Mn alloys were prepared using mechanical alloying and spark plasma sintering. The study found that increasing the milling time reduces the particle size of the alloy powder, but increases the oxygen content. Among all the investigated alloys, Ti-24Nb-4Zr-3Mn alloy prepared by 20-hour milling showed excellent comprehensive mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Miroslav Karlik, Filip Prusa, Petr Kratochvil, Hana Thurlova, Angelina Strakosova, Jaroslav Cech, Jiri Capek, Marek Vronka, Marcello Cabibbo, Ondrej Ekrt
Summary: Three CoCrFeNiNbX alloys with 5 at.% SiC addition were prepared by mechanical alloying and spark plasma sintering. The alloys exhibited a combination of face-centered cubic solid solution, carbides, and Laves phase. Addition of Nb led to a decrease in the FCC solid solution fraction and an increase in NbC carbide and Laves phase content. Long-term annealing at 800 degrees C resulted in the disappearance of Cr7C3 carbide in the Nb5 alloy and formation of new oxides. The Nb5 alloy showed good strength and ductility, whereas Nb20 and Nb35 alloys became brittle. Nb35 alloy exhibited superior strength and comparable plasticity compared to Nb5 and Nb20 alloys at 800 degrees C.
Article
Materials Science, Multidisciplinary
Jeong-Han Lee, Ik-Hyun Oh, Ju-Hun Kim, Sung-Kil Hong, Hyun-Kuk Park
Summary: In this study, WC-based hard materials were fabricated by spark plasma sintering, and their mechanical properties were improved through mechanical alloying. The non-isothermal sintering kinetics were found to affect densification behavior, and the addition of ZrSiO4 enhanced fracture toughness.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Junaid Ahmed, Ihsan-ul-Haq Toor, Mohamed A. Hussein, Nasser Al-Aqeeli, Mirza M. A. Baig
Summary: Nanostructured ferritic and austenitic stainless steel alloys with different Si contents were developed using mechanical alloying and spark plasma sintering. The addition of Si increased the densification and electrochemical performance of the alloys.
Article
Materials Science, Multidisciplinary
M. P. Kamil, D. Sandyaning, A. S. Wismogroho, K. Corneliasari, B. Hermanto, T. Sudiro, A. Afandi
Summary: This study investigated a Ni-38Mo binary alloy, focusing on Ni solid solution and Ni-Mo intermetallic phases. A homogeneous Ni-Mo alloy powder obtained by mechanical alloying was consolidated using spark plasma sintering (SPS). The main phases observed after sintering were a Ni(Mo) solid solution and the delta-NiMo intermetallic phase.
Article
Chemistry, Physical
Ilona Vonavkova, Filip Prusa, Jiri Kubasek, Alena Michalcova, Dalibor Vojtech
Summary: In this study, a quaternary Ti-25Nb-4Ta-8Sn alloy was prepared using the spark plasma sintering method and heat treated. The results showed that the spark plasma sintering method produced samples with low porosity and fine-grained structure, leading to higher mechanical properties. Annealed samples showed improved modulus of elasticity, yield strength, and ultimate tensile strength, but decreased ductility.
Article
Chemistry, Physical
Angelina Strakosova, Filip Prusa, Alena Michalcova, Petr Kratochvil, Dalibor Vojtech
Summary: This study investigates the influence of different temperatures on the mechanical properties and microstructure of additively manufactured high-strength maraging steel, revealing the impact of temperature on microhardness and mechanical properties, as well as the changes in microstructure.
Article
Materials Science, Multidisciplinary
Orsolya Molnarova, Stanislav Habr, Jaroslav Capek, Ondrej Ekrt, Premysl Malek, Lucia Bajtosova, Andrea Skolakova, Pavel Lejcek
Summary: The influence of mandrel rotation on the microstructure and mechanical properties of aluminum alloy tubes was investigated. Tubes processed with a stationary mandrel showed a recovered microstructure, while tubes processed with a rotating mandrel exhibited a dynamically recrystallized microstructure. The rotating mandrel resulted in a higher hardness increase, with an increase of 200%, achieving substantial grain refinement.
Article
Physics, Applied
Alena Uhnakova, Anna Machova, Michaela Janovska, Martin Sevcik, Jan Stefan, Petr Hora, Jaroslav Capek, Pavel Lejcek
Summary: This paper presents an experimental and 3D atomistic study on the influence of loading rate on fracture toughness in dilute Fe-Si alloys and bcc iron. The results show a decrease in fracture toughness at the highest loading rate, which is in agreement with previous experimental findings. Molecular dynamics simulations reveal that the emission of blunting dislocations from the crack is the most difficult under the highest loading rate, leading to a reduced fracture toughness at the atomic level.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Manufacturing
Hana Thurlova, Filip Prusa
Summary: In this study, CoCrFeNiMnXAl20-X (X=5, 10, 15) alloys were prepared by mechanical alloying and spark plasma sintering. It was found that substituting Mn with Al increased the volume content of solid solution and improved the mechanical properties. The CoCrFeNiMn5Al15 alloy showed the best properties.
MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Alena Reznickova, Hoang Yen Nguyenova, Kamil Zaruba, Jana Strasakova, Zdenka Kolska, Alena Michalcova, Filip Prusa, Ondrej Kvitek, Petr Slepicka, Petr Sajdl, Vaclav Svorcik
Summary: This study prepared antibacterial surfaces by grafting silver nanoparticles onto PET surface. The shape of the nanoparticles significantly influenced their antibacterial properties, with triangular nanoparticles showing slightly better antibacterial activity than spherical nanoparticles. E. coli was not significantly affected by the prepared substrates, possibly due to low concentration of grafted silver.
Article
Chemistry, Physical
Tomas Lovasi, Vojtech Pecinka, Jakub Ludvik, Jiri Kubasek, Filip Prusa, Milan Kouril
Summary: Stainless steels are suitable for constructing various parts of fuel cells, especially bipolar plates. They have valuable electrical and thermal conductivity, reasonably low cost, excellent mechanical properties, and good formability. This study tested different stainless steel materials in a simulated fuel cell environment and found that alloys with boron and manganese can improve the contact resistance properties of stainless steels.
Article
Engineering, Manufacturing
Angelina Strakosova, Petr Kratochvil, Jan Riedl, Filip Prusa
Summary: This study investigated the influence of Al content on the microstructure and mechanical properties of CoCrFeNiAl high-entropy alloys, showing that the best mechanical properties were achieved at 20 at.% Al.
MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Petr Kratochvil, Filip Prusa
Summary: In this study, mechanical alloying and spark plasma sintering were used to fabricate CoCrFeNiTi alloy. The alloy was characterized in terms of chemical and phase composition, microstructure, and mechanical properties.
MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Jan Pinc, Jiri Kubasek, Jan Drahokoupil, Jaroslav Capek, Dalibor Vojtech, Andrea Skolakova
Summary: In this study, a Zn-0.8Mg-0.28CaO wt.% composite was prepared using different ball milling conditions and a direct extrusion process. The microstructure and compressive properties of the materials were characterized, and the correlation between these characteristics was examined. It was found that the grain size and compressive strength did not have a linear relationship due to the influence of factors such as texture, intermetallic phases, and pores.
Article
Chemistry, Physical
Hana Thurlova, Filip Prusa
Summary: Substituting part of Mn with Al in equiatomic CoCrFeNiMn alloy can enhance the hardness and strength of the alloy, with the most promising mechanical properties observed in the CoCrFeNiMn5Al15 alloy. All prepared alloys showed good thermal stability, with higher Al content leading to better resistance against high-temperature oxidation.
Article
Chemistry, Physical
Pavel Salvetr, Andrea Skolakova, Jakub Kotous, Jan Drahokoupil, Daniel Melzer, Zdenek Jansa, Crtomir Donik, Aleksandr Gokhman, Zbysek Novy
Summary: The present study aimed to investigate the properties of medium-carbon steel during tempering treatment and to enhance the strength of medium-carbon spring steels using strain-assisted tempering (SAT). The effects of double-step tempering and double-step tempering with rotary swaging (SAT) on mechanical properties and microstructure were examined. The results showed that SAT treatment significantly increased the yield strength of the medium-carbon steel samples, while reducing the plastic properties such as elongation and reduction in area compared to the double-step tempering treatment. Grain boundary strengthening and lower dislocation strengthening contribution were observed in the SAT samples.
Article
Chemistry, Physical
Miroslav Karlik, Filip Prusa, Petr Kratochvil, Hana Thurlova, Angelina Strakosova, Jaroslav Cech, Jiri Capek, Marek Vronka, Marcello Cabibbo, Ondrej Ekrt
Summary: Three CoCrFeNiNbX alloys with 5 at.% SiC addition were prepared by mechanical alloying and spark plasma sintering. The alloys exhibited a combination of face-centered cubic solid solution, carbides, and Laves phase. Addition of Nb led to a decrease in the FCC solid solution fraction and an increase in NbC carbide and Laves phase content. Long-term annealing at 800 degrees C resulted in the disappearance of Cr7C3 carbide in the Nb5 alloy and formation of new oxides. The Nb5 alloy showed good strength and ductility, whereas Nb20 and Nb35 alloys became brittle. Nb35 alloy exhibited superior strength and comparable plasticity compared to Nb5 and Nb20 alloys at 800 degrees C.
Article
Engineering, Biomedical
Jan Pinc, Andrea Skolakova, Vojtech Hybasek, Sarka Msallamova, Petr Vertat, Petr Ashcheulov, Martin Vondracek, Jan Duchon, Ingrid McCarroll, Matej Hyvl, Swarnendu Banerjee, Jan Drahokoupil, Jiri Kubasek, Dalibor Vojtech, Jaroslav Capek
Summary: Advanced techniques were used to investigate the corrosion mechanism of the as-ECAPed Zn-0.8Mg-0.2Sr alloy, revealing the formation of thin oxide layers on the surface before exposure and their participation in corrosion product formation. The segregation of Mg on the Zn grain boundaries was observed, leading to localized corrosion attacks. Micro-galvanic cells and crevice corrosion mechanism were identified as the initiation process for degradation, resulting in an corrosion rate of 0.36 mm center dot a (-1).
BIOACTIVE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
H. Shang, E. Elmukashfi, J. Capek, P. Lejcek, K. R. Hallam, A. C. F. Cocks, C. Hardie, T. L. Martin, P. E. J. Flewitt
Summary: This paper presents a novel constant load cantilever beam test to investigate creep damage and cavitation at grain boundaries in copper bicrystals. It is found that creep cavitation occurs at the grain boundaries of copper bicrystals with certain orientations. The results are compared with observations from a polycrystalline copper specimen.
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)
