Article
Metallurgy & Metallurgical Engineering
Francisco Rafael Campos de Macedo, Romulo Ribeiro Magalhaes de Sousa, Jose Wellinton Nogueira Jr, Cleanio Luz-Lima, Maxwell Santana Liborio, Anderson de Oliveira Lobo, Vladimir Jesus Trava-Airoldi, Fernanda Roberto Marciano, Michelle Cequeira Feitor, Thercio Henrique de Carvalho Costa, Rubens Maribondo do Nascimento
Summary: Plasma nitriding is widely used to improve material properties, but it often leads to nonuniformity. Cathodic cage plasma nitriding (CCPN) eliminates defects and a duplex treatment of CCPN and TiN deposition is used on SINTER30 tool steel for the first time. Vickers microhardness tests and other characterization methods show that TiN post-coating achieves higher surface hardness and all groups exhibit increased microhardness compared to untreated substrates. The prior plasma nitriding treatment enhances substrate surface hardening, and the best condition is simultaneous duplex treatment with the sample inside the titanium cage. Suitable TiN layers improve film adhesion, correlated to load-bearing capacity.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Construction & Building Technology
M. Naeem, A. V. R. Torres, P. L. C. Serra, R. M. Moncao, C. A. Antonia Junior, L. S. Rossino, T. H. C. Costa, C. L. S. C. Costa, Javed Iqbal, R. R. M. Sousa
Summary: This study investigates the improvement of surface properties of AISI-1045 steel through the combination of cathodic cage plasma nitriding and conventional plasma nitriding, which involves the deposition of alloying elements and subsequent nitrogen diffusion to enhance coating adhesion and hardness gradient formation. The results show significant enhancement in hardness and wear resistance, making this duplex treatment method effective for industrial applications.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Coatings & Films
Jiaqin Liu, Xiaofang Wang, Yin Hu, Lizhu Luo, Chunli Jiang, Fan Liu, Wei Jin, Kangwei Zhu, Zhong Long, Kezhao Liu
Summary: Surface modification technologies have been used to improve the mechanical properties of Ti and its alloys. In this study, the influence of different H2/(N2 + H2) ratio on the microstructure of Ti specimens nitrided by cathodic cage plasma nitriding (CCPN) was investigated. It was found that the compound layer thickness and surface hardness increased with the introduction of H2, but the tensile properties were deteriorated due to the generation of titanium hydride during nitriding process.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
M. Naeem, Shabana Awan, M. Shafiq, H. A. Raza, Javed Iqbal, J. C. Diaz-Guillen, R. R. M. Sousa, Mohsan Jelani, M. Abrar
Summary: The study aims to improve the surface properties of AISI-304 austenite stainless steel by combining cathodic cage plasma nitriding (CCPN) and PVD-TiN treatments, which significantly enhances hardness, wear resistance, and corrosion resistance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Y. Uzun
Summary: This study investigates the tribocorrosion behavior of untreated, plasma nitrided, Ti-DLC coated, and duplex treated AISI 316L stainless steel. The results show that the wear mechanism causes much more damage than corrosive effects. Generally, the wear and tribocorrosion performance of the treated samples increase compared to the untreated sample, thanks to the layers formed on the surface. The best tribocorrosion resistance is observed in the duplex surface-treated sample.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Yang Li, Yongjie Bi, Minyi Zhang, Shangzhou Zhang, Xuepeng Gao, Zhehao Zhang, Yongyong He
Summary: The study found that samples treated with HCPSN had better chemical composition and corrosion resistance than those treated with CPN, indicating that the mechanism of HCPSN treatment conforms to the 'sputtering-deposition-adsorption-diffusion' model.
SURFACE ENGINEERING
(2021)
Article
Chemistry, Analytical
Mirza Z. Babur, Aiyah S. Noori, Zafar Iqbal, Muhammad Shafiq, Muhammad Asghar, Abdulaziz H. Alghtani, Vineet Tirth, Ali Algahtani, Abid Zaman
Summary: Compared to other types of stainless steels, ferritic stainless steels have lower hardness and wear resistance but excellent corrosion resistance. The use of titanium nitride coating can enhance the tribological properties of ferritic stainless steels, increasing hardness and reducing wear rate.
Article
Materials Science, Multidisciplinary
Jiqiang Wu, Changjun Mao, Kunxia Wei, Jing Hu
Summary: By adding titanium in plasma nitriding process, a nitriding layer with enhanced properties can be obtained, including thicker ductile diffusion layer, thinner brittle compound layer, and higher surface hardness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Armystron G. F. Araujo, M. Naeem, Luciane N. M. Araujo, Maxwell S. Liborio, Miguel R. Danelon, Renan M. Moncao, Luciana S. Rossino, Michelle C. Feitor, Rubens M. do Nascimento, Thercio H. C. Costa, Romulo R. M. Sousa
Summary: The study aimed to enhance the hardness and wear resistance of AISI 5160 steel by performing plasma nitriding with Hastelloy's cathodic cage followed by conventional plasma nitriding. The treated samples and cutting tools showed improved wear resistance compared to untreated samples and high-speed steel tools.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Jiawei Yao, Fuyao Yan, Baofeng Chen, Ying Yang, Yueming Xu, Mufu Yan, Yanxiang Zhang
Summary: Simultaneous plasma nitriding and tempering on as-solutioned M50 steel achieves high surface hardness and through-hardened core, significantly increasing nitrided layer thickness and forming a high hardness layer, leading to reduced friction coefficient and improved wear resistance. The nitrided layer with gradient nano-structure was observed by TEM, explaining the observed supersaturation of nitrogen in the sub-surface layer as a result of spinodal decomposition.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Xiao Tao, Thomas John Collins, Qingshuo Ao, Huibin Liu, Behnam Dashtbozorg, Xiaoying Li, Hanshan Dong
Summary: In this study, Fe-24Mn-2Al-0.45C TWIP steel was investigated after active screen plasma nitriding (ASPN) treatment at temperatures ranging from 350-480 degrees C. The study revealed a selective oxidation mechanism on TWIP steel during ASPN treatment at 480 degrees C, resulting in a different hardness-depth profile compared to lower temperatures.
Article
Materials Science, Coatings & Films
Joseba Murua, Inigo Ibanez, Anastasia Dianova, Santiago Dominguez-Meister, Oihane Larranaga, Aitor Larranaga, Inigo Braceras
Summary: This work explores the performance of single process duplex tribo-conditioning treatments based on pulsed low-pressure plasma treatments. The use of pulsed plasmas generates softer, smoother, and more hydrophobic surfaces. The results show that the tribological outcomes heavily depend on ambient conditions and the wear track surface condition.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
P. R. Q. de Almeida, P. L. C. Serra, M. R. Danelon, L. S. Rossino, T. H. C. Costa, M. C. Feitor, A. S. de Menezes, R. M. Nascimento, R. M. Sousa, F. R. Marciano
Summary: The study found that the combination treatment of nitrided layer and TiN film can significantly reduce the wear volume of UNS S32760 super duplex stainless steel, increase surface microhardness, and improve the adhesion conditions between the film and the substrate. The treated samples showed lower oxygen content in the wear region during testing, indicating lower heating conditions.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Construction & Building Technology
Mirza Zaheer Babur, Zafar Iqbal, Muhammad Shafiq, Muhammad Y. Naz, Mohamed M. Makhlouf
Summary: The poor mechanical properties of AISI 201 stainless steel under harsh environment limit its applications in modern industries. Various technologies are being explored to reduce wear and tear, but the optimal method is still under development. This study introduced a novel duplex surface coating method to develop anti-wear and anti-corrosive TiN-coating over AISI 201 stainless steel, significantly improving its mechanical qualities.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Coatings & Films
Oriana Palma Calabokis, Yamid Nunez de la Rosa, Carlos M. Lepienski, Rodrigo Perito Cardoso, Paulo Cesar Borges
Summary: Nitriding treatment on UNS 532750 super duplex stainless steel improved hardness, general corrosion resistance, passive layer breakdown potential, and crevice corrosion resistance. Nitrogen played a crucial role in the passivation behavior and susceptibility to repassivation of localized corrosion.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
M. G. C. Barbosa, B. C. Viana, F. E. P. Santos, F. Fernandes, M. C. Feitor, T. H. C. Costa, M. Naeem, R. R. M. Sousa
Summary: The study found that TiN film deposition using CCPD can effectively improve the surface properties of tool steel with advantages of short processing time, low processing temperature, and better uniformity.
SURFACE ENGINEERING
(2021)
Article
Materials Science, Coatings & Films
M. Naeem, V. C. Fortaleza, P. L. C. Serra, C. L. Lima, T. H. C. Costa, R. R. M. Sousa, J. C. Diaz-Guillen, S. Mancillas-Salas, Javed Iqbal
Summary: This study synthesized a molybdenum oxide coating using cathodic cage plasma deposition, evaluated cathodic and floating potentials treatment, and investigated the structural and wear properties of coated AISI 316 samples. The results showed that the coating produced with floating potential treatment exhibited better wear resistance and friction coefficient, making it suitable for use as a solid lubricant in tribological applications.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
W. Nogueira Junior, M. Naeem, T. H. C. Costa, J. C. Diaz-Guillen, M. R. Diaz-Guillen, Javed Iqbal, Mohsan Jelani, R. R. M. Sousa
Summary: The ZnO film synthesized using the CCPD technique can effectively enhance the wear resistance of steels, change the wear mechanism, and optimize surface hardness. The gas composition significantly affects the film properties, where an increase in hydrogen content reduces film thickness.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Physics, Condensed Matter
J. C. A. Queiroz, M. Naeem, I. A. Sousa, M. S. Liborio, E. J. C. Santos, R. R. M. Sousa, I. O. Nascimento, M. C. Feitor, T. H. C. Costa, Javed Iqbal
Summary: Transparent conducting oxides (TCO), such as ZnO/Zn2TiO4/ZnAl2O4 composite films, are important for optoelectronic applications. This study used DC magnetron sputtering with ceramic target material to fabricate composite films and evaluated the effects of processing gases composition on film characteristics. The results showed that oxygen addition influenced the structural, optical, and electronic properties of the films.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Uzair Ahmed, Mohsan Jelani, Najam Ul Hassan, Muhammad Naeem, Tahir Zaman, Shahbaz Ahmad
Summary: This study investigates the cluster dynamics of gold and copper ions in a low energy range through bombardment of gold and copper targets with low energy cesium ions. The results show that the sputtering behavior of copper remains constant, while the cluster sputtering probability of gold clusters slightly increases with an increase in incident ion energy.
SURFACE REVIEW AND LETTERS
(2022)
Article
Materials Science, Ceramics
M. Naeem, Shabana Awan, M. Shafiq, H. A. Raza, Javed Iqbal, J. C. Diaz-Guillen, R. R. M. Sousa, Mohsan Jelani, M. Abrar
Summary: The study aims to improve the surface properties of AISI-304 austenite stainless steel by combining cathodic cage plasma nitriding (CCPN) and PVD-TiN treatments, which significantly enhances hardness, wear resistance, and corrosion resistance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Armystron G. F. Araujo, M. Naeem, Luciane N. M. Araujo, Maxwell S. Liborio, Miguel R. Danelon, Renan M. Moncao, Luciana S. Rossino, Michelle C. Feitor, Rubens M. do Nascimento, Thercio H. C. Costa, Romulo R. M. Sousa
Summary: The study aimed to enhance the hardness and wear resistance of AISI 5160 steel by performing plasma nitriding with Hastelloy's cathodic cage followed by conventional plasma nitriding. The treated samples and cutting tools showed improved wear resistance compared to untreated samples and high-speed steel tools.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
I. O. Nascimento, M. Naeem, R. S. Freitas, R. M. Nascimento, B. C. Viana, R. R. M. Sousa, M. C. Feitor, Javed Iqbal, T. H. C. Costa
Summary: This study compares the structural and stoichiometric properties of titanium nitride films deposited by CCPD and MS, finding that MS is more suitable for high stoichiometry films, while CCPD is better for applications requiring mechanical properties and decorative coatings.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Materials Science, Multidisciplinary
Luiz Henrique Portela de Abreu, Muhammad Naeem, Renan Matos Moncao, Thercio H. C. Costa, Juan C. Diaz-Guillen, Javed Iqbal, Romulo Ribeiro Magalhaes Sousa
Summary: This study combines conventional plasma nitriding and cathodic cage plasma deposition to enhance the surface properties of AISI-M2 steel. The combination effectively improves surface hardness and creates a favorable hardness gradient towards the core, benefiting load-bearing capacity. Duplex-treated samples exhibit iron nitrides and titanium nitride phases. The wear rate and friction coefficient are significantly reduced, and oxidative wear and adhesive wear mechanisms dominate.
Article
Construction & Building Technology
M. Naeem, A. V. R. Torres, P. L. C. Serra, R. M. Moncao, C. A. Antonia Junior, L. S. Rossino, T. H. C. Costa, C. L. S. C. Costa, Javed Iqbal, R. R. M. Sousa
Summary: This study investigates the improvement of surface properties of AISI-1045 steel through the combination of cathodic cage plasma nitriding and conventional plasma nitriding, which involves the deposition of alloying elements and subsequent nitrogen diffusion to enhance coating adhesion and hardness gradient formation. The results show significant enhancement in hardness and wear resistance, making this duplex treatment method effective for industrial applications.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Adriana M. Bonilla Loaiza, Rosa M. Rodriguez-Jasso, Ruth Belmares, Claudia M. Lopez-Badillo, Rafael G. Araujo, Cristobal N. Aguilar, Monica L. Chavez, Miguel A. Aguilar, Hector A. Ruiz
Summary: The development of green technologies and bioprocesses, such as solid-state fermentation, is important for processing macroalgae biomass and producing compounds with high added value. In this study, Sargassum spp. biomass was subjected to hydrothermal pretreatment and packed-bed bioreactor fermentation to produce fungal proteins. The results showed that a pretreatment temperature of 170 degrees C was suitable for fungal growth, and the production of fungal proteins was related to the concentration of sugars. Furthermore, the pretreatment and fermentation processes also resulted in a reduction in antinutritional elements and ash content.
Article
Engineering, Mechanical
M. Naeem, J. C. Diaz-Guillen, Ayesha Khalid, I Guzman-Flores, R. Munoz-Arroyo, Javed Iqbal, R. R. M. Sousa
Summary: In this study, high-temperature plasma nitriding was used to improve the surface hardness and wear resistance of AISI-1045 steel. Post-oxidation treatment was applied to the nitrided samples to investigate its effect. The results showed that the nitrided sample had a white layer, while post-oxidation transformed it into hematite and magnetite phases. The hardness of the nitrided samples significantly increased, although post-oxidation caused a slight decrease. The thickness of the nitrided layer and oxide layer increased with post-oxidation treatment. The nitrided sample exhibited abrasive wear, while the post-oxidized sample showed outstanding wear resistance with an adhesive wear mechanism.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
J. F. M. Neto, M. Naeem, T. H. C. Costa, L. L. F. Lima, R. R. M. Sousa, M. C. Feitor, M. S. Liborio, R. M. Nascimento
Summary: In this study, a modified cathodic cage plasma deposition (CCPD) system was used to synthesize a Ti-Nb-C-N-based composite coating on AISI-4340 steel. The composite coating exhibits enhanced hardness and wear resistance due to its effective bioactivity. By inserting composite material rings on the lid of the cathodic cage, the novel CCPD system allows for the deposition of composite coatings. The results show that the modified CCPD system can improve the hardness and wear resistance of AISI-4340 steel by synthesizing the composite coating.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
M. Shafique, Tariq Iqbal, M. A. Khan, Muhammad Naeem, Ishaq Ahmed, Pervaiz Ahmad, Hasan Mahmood
Summary: This study presents a facile method for the atmospheric pressure microplasma-assisted synthesis of NiCo2O4 nanocomposite with cubic spinel phase. The prepared samples were analyzed for their structural, morphological, compositional, electrical, and optical properties, revealing potential catalytic activity and semiconductor behavior. The study also showed significant degradation of rhodamine B dye aqueous solution under solar irradiation, highlighting the potential applications in wastewater purification and energy storage nanodevices based on NiCo2O4 nanostructures.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
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)
