Article
Materials Science, Multidisciplinary
Peng Xu, Florian Pyczak, Wolfgang Limberg, Regine Willumeit-Romer, Thomas Ebel
Summary: Titanium alloys show superior high-cycle fatigue performance by reducing processing cleanliness and tolerating impurities, resulting in higher fatigue limits and increased resistance against fatigue small cracks.
MATERIALS & DESIGN
(2021)
Review
Chemistry, Physical
Al Basir, Norhamidi Muhamad, Abu Bakar Sulong, Nashrah Hani Jamadon, Farhana Mohd Foudzi
Summary: Metal injection molding (MIM) is a cost-effective manufacturing process widely used for producing dental and orthopedic implants, surgical instruments, and other biomedical products. Titanium and titanium alloys have superior properties that make them suitable for biomedical applications, and this review examines the MIM process parameters and the effect of sintering temperature on the mechanical properties of the components. The study concludes that defect-free biomedical components can be produced by carefully selecting and implementing the processing parameters, offering potential benefits for future research in this field.
Article
Materials Science, Multidisciplinary
Chanun Suwanpreecha, Sukrit Songkuea, Pranpreeya Wangjina, Makiko Tange, Wanida Pongsaksawad, Anchalee Manonukul
Summary: Ti-Mo alloys were prepared by metal injection moulding (MIM) and sintering method, and the effects of Mo powder additions on the physical, mechanical and corrosion properties of commercially pure Ti were investigated. The study found that the tensile strength of the alloys increased with increasing Mo content, while the strain to failure varied due to TiCx formation, sintered density, and impurities. The optimum alloy was Ti-7.5Mo, sintered at 1250°C for 2 hours, which exhibited suitable tensile properties, high relative density (>96.5%), and excellent corrosion resistance in an artificial saliva environment, making it an ideal material for biomedical applications.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Zhongjie Li, Hao Xu, Anping Dong, Jiajun Qiu, Lin He, Ting Zhang, Dafan Du, Hui Xing, Guoliang Zhu, Donghong Wang, Baode Sun
Summary: A novel Ti-Nb-Mg alloy was fabricated by MA and SPS, with different BPR, ball-milling time and composition affecting the morphology evolution, microstructure, mechanical and biological properties. Increasing Mg content from 3 wt% to 5 wt% led to deterioration in strength and fracture strain of the alloys, while differences in element distribution were observed under different BPR.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Shaohua Su, Zijian Hong, Yuhui Huang, Peng Wang, Xiaobao Li, Junwen Wu, Yongjun Wu
Summary: Metal injection molding (MIM) is an advanced manufacturing technology for mass production of high-performance and complex materials. A finite element method based on a thermal-elastic-viscoplastic macroscopic model was developed to predict the size change and deformation of injection-molded alloys after sintering. Excellent agreements between experimental measurements and numerical simulations confirm the accuracy of the model, which can be used for mold design and sintering optimization in the MIM process.
Article
Materials Science, Multidisciplinary
Mohd Yusuf Zakaria, Mohd Ikram Ramli, Abu Bakar Sulong, Norhamidi Muhamad, Muhammad Hussain Ismail
Summary: This study identified critical PIM parameters for processing porous alloy titanium-hydroxyapatite composites via the space holder method, producing porous parts with a porosity level of 37.03%. The combination of PIM and the space holder method was found to be a promising technique for manufacturing near net-shaped porous titanium-hydroxyapatite composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Ceramics
Alex Humberto Restrepo Carvajal, Alejandro Alberto Zuleta Gil, G. Juan Guillermo Castano, Jesus Maria Rios Arbelaez, Esteban Correa Bedoya, Francisco Javier Bolivar Osorio, Felix Echeverria Echeverria
Summary: High compressive strength composite materials based on commercially pure titanium were successfully synthesized using Ti Cp grade 2 powders processed by high-energy ball milling and subsequent sintering. The microstructure of the material was influenced by the speed and time of milling, and its mechanical properties were related to the microstructure. The high compressive strength was attributed to the distribution of particles, fine grain size, and formation of titanium carbide.
CERAMICS INTERNATIONAL
(2023)
Article
Automation & Control Systems
Shaohua Su, Zijian Hong, Yongjun Wu, Peng Wang, Xiaobao Li, Junwen Wu, Yuhui Huang
Summary: This article investigates the impact of the sintering and hot isostatic pressing process on the microstructure and mechanical performances of Ti-6Al-4V alloy manufactured by MIM. The results indicate that the thickness of the dense layer, grain size, grain morphology, and grain orientation are key factors determining the mechanical performances. Under the optimized condition, Ti-6Al-4V alloy exhibits outstanding mechanical performances with high tensile strength, yield strength, and elongation.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Dariusz Garbiec, Alexander M. Laptev, Volf Leshchynsky, Maria Wisniewska, Pawel Figiel, Anna Biedunkiewicz, Piotr Siwak, Jan Raethel, Johannes Poetschke, Mathias Herrmann
Summary: The sintering process of WC-Ti powder mixtures with different titanium contents was investigated, and it was found that the phase composition and microstructure of the samples varied with different titanium contents. The sample with 5% titanium showed the best combination of hardness and fracture toughness.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Dina Dudina, Tomila M. Vidyuk, Alexander Gavrilov, Arina Ukhina, Boris B. Bokhonov, Mikhail A. Legan, Alexander A. Matvienko, Michail A. Korchagin
Summary: The study focused on separating the effects of reaction and spark plasma sintering (SPS) during the in-situ synthesis of TiC in mechanically milled Ti-C-3Cu powder mixtures, with particular attention to the impact of copper on the microstructure.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Grzegorz Matula, Aleksandra Szatkowska, Krzysztof Matus, Blazej Tomiczek, Miroslawa Pawlyta
Summary: The study fabricated cobalt-chromium-molybdenum alloy samples using the PIM method, obtaining components with good mechanical properties through thermal degradation and sintering.
Article
Engineering, Manufacturing
Kedarnath K. Rane, Prashant P. Date, Girish N. Kotwal, Kanhu C. Nayak, T. S. Srivatsan
Summary: Sintering, the final step of Metal Injection Molding (MIM), plays a significant role in influencing the characteristics and performance of final products. This research investigates the impact of sintering parameters on dimensional stability and mechanical properties of parts with different shapes. The study found that parts produced using grinding sludge powder showed inferior sintering characteristics compared to those produced using carbonyl iron powder. Empirical relationships were developed to predict the properties of sintered products based on the sintering parameters employed.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Chemistry, Physical
Sadaqat Ali, Muhammad Irfan, Usama Muhammad Niazi, Ahmad Majdi Abdul Rani, Imran Shah, Stanislaw Legutko, Saifur Rahman, Mohammed Jalalah, Mabkhoot A. Alsaiari, Adam Glowacz, Fahad Salem AlKahtani
Summary: Powder metallurgy technique is widely used for producing different alloy compositions with desired properties. This research focuses on the addition of titanium and niobium in a stainless steel matrix for potential biomedical applications. The increase in sintering dwell time led to simultaneous sintering and surface nitriding of compositions, resulting in improved corrosion resistance and non-cytotoxicity of the developed alloy compositions.
Article
Chemistry, Physical
Samantha Husmann, Marie Besch, Bixian Ying, Anika Tabassum, Michael Naguib, Volker Presser
Summary: Mixed-metal oxides (MMOx) are versatile in energy conversion and electrochemical energy storage. Layered mixed-metal carbides (MXenes) are used as templates to prepare MMOx, which have uniform metal distribution. The Ti-to-Nb ratio in MXene affects the derived oxide composition. MXene-derived MMOx exhibit good electrochemical performance as Li-ion battery electrodes.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jiang Wu, Xiao Tan, Xuguang An, Jing Zhang, Yi Guo, Jia Liu, Yuanqi Luo, Weitang Yao, Qingquan Kong, Qingyuan Wang
Summary: A series of Ti-24Nb-4Zr-xMn (x = 0, 1, 3, 5 wt%) alloys were successfully fabricated using mechanical alloying and spark plasma sintering, and the effect of Mn content on the microstructures, mechanical properties, and corrosion resistance of these alloys was systematically investigated. The results showed that moderate Mn can improve mechanical properties and corrosion resistance. Among all the investigated alloys, Ti-24Nb-4Zr-3Mn alloy exhibited the highest compressive strength and large strain. This study provides a potential strategy for developing high-performance biomedical Ti-Nb-Zr-Mn alloys for biological implantation.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Leilei Chen, Zhenyu Zhang, Ming Lou, Kai Xu, Lu Wang, Fanning Meng, Denis Music, Keke Chang
Summary: This study explores the wear performance of the MEN system TiNbWN at different temperatures and reveals the role of in situ formed nanocrystalline oxides in the wear mechanism transition. This research is of great significance for understanding the wear behavior of refractory nitride films at high temperatures.
Article
Materials Science, Multidisciplinary
Zhenghui Zheng, Jian Lv, Ming Lou, Kai Xu, Leilei Chen, Jianbo Zhang, Yujie Du, Weibin Zhang, Keke Chang
Summary: Novel macro-gradient structures in the Ti(C, N)-based cermet systems were observed for the first time in this study. The thermodynamic mechanisms behind the formation of these structures were elucidated, with a focus on the denitrification-induced W solubility change. Additionally, the usefulness of thermodynamic calculations in establishing composition-microstructure relationships in cermets was demonstrated.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Shibo Zhou, Tingting Liu, Aitao Tang, Yuanding Huang, Peng Peng, Jianyue Zhang, Norbert Hort, Regine Willumeit-Roemer, Fusheng Pan
Summary: This study investigates the effect of Sm element addition on the mechanical properties of magnesium (Mg) alloys. Experimental and computational methods were used to explore the mechanisms responsible for the improvements. The results show that the addition of Sm enhances the microstructure and mechanical properties, promoting the formation of twins and activating non-basal <a> slip, resulting in increased ductility.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Ceramics
Qi Zhou, Dandan Huang, Kai Xu, Ming Lou, Jian Lv, Fangming Wang, Chengcheng Zhan, Tingting Tang, Keke Chang
Summary: Rare earth (RE) oxides are commonly used as dopants in cermet materials to improve toughness, but their effect on microstructure is still not clear. In this study, TiC-based cermets with different La2O3 contents were prepared using vacuum sintering and the evolution of microstructural changes was studied using experimental approaches and thermodynamic calculations. It was found that the addition of La2O3 resulted in the formation of a black core-grey rim structure in the ceramic phase of the cermets. Unexpectedly, a solid-solution of La in the ceramic phase was observed, which helped refine particle size and reduce porosity. The toughness and density of the cermets were increased due to the well-developed grey rims and improved wettability between the ceramic and metallic phases. Thermodynamic calculations showed that La solid-solution occurred primarily in the ceramic phase and the addition of a trace amount of La expanded the temperature range of liquid-phase sintering, facilitating the formation of grey rims. This work provides insights into the microstructure and mechanical properties of RE-containing cermets, guiding future developments.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Berit Zeller-Plumhoff, Heike Helmholz, Frank Feyerabend, Thomas Dose, Fabian Wilde, Alexander Hipp, Felix Beckmann, Regine Willumeit-Roemer, Joerg U. Hammel
Summary: Magnesium-based alloys are considered as an alternative material for bone implants. The degradation rate of the implants is crucial for their performance evaluation, but different equations based on 3D imaging have been used to determine it. In this technical note, we discuss the deviation in degradation rates determined by different equations for two sets of data and its implications for comparative studies.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2023)
Article
Materials Science, Coatings & Films
Ge Zhang, Khashayar Khanlari, Shan Huang, Xiaosong Li, Dapeng Zhao, Hong Wu, Yuankui Cao, Bin Liu, Qianli Huang
Summary: In this study, equi-atomic Ti-Nb-Ta-Zr-Hf bio-HEA was subjected to plasma electrolytic oxidation (PEO) at different voltages. The resulting coatings showed different microstructures and exhibited different wear and corrosion resistance. The PEO-200 V treated group showed the best wear resistance, while the PEO-150 V treated group showed the best corrosion resistance. In vitro experiments confirmed the favorable cytocompatibility of the PEO-treated surfaces.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Jan Reimers, Huu Chainh Trinh, Bjoern Wiese, Sebastian Meyer, Jens Brehling, Silja Flenner, Johannes Hagemann, Maximilian Kruth, Lidia Kibkalo, Hanna Ciwieka, Birte Hindenlang, Marta Lipinska-Chwalek, Joachim Mayer, Regine Willumeit-Roemer, Imke Greving, Berit Zeller-Plumhoff
Summary: Functional materials with hierarchical microstructures have unique properties that require an understanding of the mechanistic interaction between microstructure and property. In this study, a novel experimental flow cell was developed for in-situ 3D-nano imaging of the biodegradation process of biodegradable magnesium alloys. The importance of maintaining physiological conditions and the comparison of two imaging techniques were highlighted.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Pingli Jiang, Ruiqing Hou, Tao Chen, Lingchuang Bai, Jingan Li, Shijie Zhu, Liguo Wang, Regine Willumeit-Roemer, Shaokang Guan
Summary: Novel calcium carbonate (CaCO3) coatings were prepared via the hydrothermal method and optimized with the addition of glutamate acid (Glu) or dopamine (DOPA) to improve the degradation and biological performance of MgZnCa alloy.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Fangming Wang, Ruonan Zhou, Kai Xu, Ming Lou, Keke Chang
Summary: The influence of Si content on the oxidation behavior of the Y-related structure (Ni5Y) in NiAlYSi alloy was investigated. Higher Si content increases the diffusion energy barrier of Ni in the Ni5Y phase, preventing the growth of NiO in the outer layer. The inward diffusion of O is effectively impeded by the Y2SiO5-+Y2Si2O7+Al2O3+Y2O3 layer produced by the (Ni, Al, Si)5Y phase. The outward diffusion of Ni is also inhibited by this layer. Therefore, Si alters the oxidation mechanism of the Ni5Y phase, which has not been found before.
Article
Engineering, Biomedical
Dirk Steglich, Jacques Besson, Inken Reinke, Heike Helmholz, Monika Luczak, Vasil M. Garamus, Bjoern Wiese, Daniel Hoeche, Christian J. Cyron, Regine Willumeit-Roemer
Summary: We proposed a computational framework to study the effect of corrosion on the mechanical strength of magnesium (Mg) samples. By using a mass-diffusion type model accounting for localized corrosion with Weibull statistics, we could predict the residual strength of biomedical Mg implants after a given period of degradation in a physiological environment. The framework successfully modeled the mechanical behavior of the Mg samples and predicted the loss of mechanical strength and ductility due to corrosion.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Valeria Grasso, Jason L. Raymond, Regine Willumeit-Roemer, James Joseph, Jithin Jose
Summary: A stable phantom that mimics the detailed morphology of a mouse has been designed, developed, and fabricated for photoacoustic imaging (PAI). The phantom includes a 3D-printed skeleton and the main abdominal organs, and is made of a copolymer-in-oil-based material. The results show that the phantom is durable, stable, and offers a realistic resemblance to the actual rodents' anatomy.
Article
Engineering, Biomedical
Jonathan Espiritu, Sandra Sefa, Hanna Cwieka, Imke Greving, Silja Flenner, Regine Willumeit-Roemer, Jan-Marten Seitz, Berit Zeller-Plumhoff
Summary: The increasing prevalence of bone-related injuries and aging geriatric populations are driving the growth of the orthopaedic implant market. A hierarchical analysis of bone remodelling after material implantation is necessary to understand the relationship between implant and bone. Osteocytes play a vital role in bone health and remodelling processes, making it essential to examine the lacuno-canalicular network (LCN) in response to implant materials. Biodegradable materials, such as magnesium alloys, offer a potential solution to permanent implants, and surface treatments like plasma electrolytic oxidation (PEO) can slow degradation. This study investigates the impact of PEO-coated WE43 on the LCN using nondestructive 3D imaging, and the findings suggest that slower degradation induced by PEO-coating results in healthier lacunar shapes within the LCN.
BIOACTIVE MATERIALS
(2023)
Article
Engineering, Biomedical
Stefan Bruns, Diana Krueger, Silvia Galli, D. C. Florian Wieland, Jorg U. Hammel, Felix Beckmann, Ann Wennerberg, Regine Willumeit-Roemer, Berit Zeller-Plumhoff, Julian Moosmann
Summary: The microstructural architecture of remodeled bone in the peri-implant region of screw implants affects strain energy distribution and implant stability. This study used synchrotron-radiation microcomputed tomography to examine screw implants made from different biomaterials implanted in rat tibia. The results showed that the choice of biomaterial significantly influenced peri-implant bone morphology and strain transfer, and implant stability varied depending on the biomaterial used.
BIOACTIVE MATERIALS
(2023)
Article
Engineering, Biomedical
Heithem Ben Amara, Diana C. Martinez, Furqan A. Shah, Anna Johansson Loo, Lena Emanuelsson, Birgitta Norlindh, Regine Willumeit-Romer, Tomasz Plocinski, Wojciech Swieszkowski, Anders Palmquist, Omar Omar, Peter Thomsen
Summary: Using a rat soft tissue model, the researchers found that magnesium (Mg) implants exacerbated initial inflammation but also initiated chemotaxis and upregulated immunomodulatory markers, leading to tissue repair. The understanding of the relationship between Mg material properties and cellular processes provides a basis for interpretation of clinical observations and future improvements in Mg implants.
BIOACTIVE MATERIALS
(2023)
Article
Engineering, Biomedical
Diana C. Martinez, Anna Dobkowska, Romy Marek, Hanna Cwieka, Jakub Jaroszewicz, Tomasz P. Plocinski, Crtomir Donik, Heike Helmholz, Berengere Luthringer-Feyerabend, Berit Zeller-Plumhoff, Regine Willumeit-Roemer, Wojciech Swieszkowski
Summary: This study investigated the degradation of an Mg-0.45Zn-0.45Ca (ZX00) screw in vitro and in vivo. The results showed that the ZX00 alloy promoted bone healing and the formation of new bone. Despite the correlation with the production procedure, the ZX00 alloy was still suitable for temporary bone implants.
BIOACTIVE MATERIALS
(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)
