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Spherical Magnetic Fe-Alginate Microgels Fabricated by Droplet-Microfluidics Combining with an External Crosslinking Approach and the Study of Their pH Dependent Fe^(3+) Release Behaviors

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Chinese Journal of Polymer science 2025年第2期43卷 289-302页

作者： Jie Chen Run-Yu Yu ai-Qi Wang Zhe-Yu Zhang Arezoo Ardekani Yuan-Du Hu Department of Materials Science and Engineering School of Physics Science and EngineeringBeijing Jiaotong UniversityBeijing100044China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou510641China State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai200438China Department of Mathematics School of Mechanical EngineeringPurdue University585 Purdue MallWest LafayetteIN47907-2088USA

Due to the rapid development and potential applications of iron(Ⅲ)-alginate(Fe-Alg)microgels in biomedical as well as environmental engineering,this study explores the preparation and characterization of spherical Fe-Alg microgels using droplet microfluidics combined with an external ionic crosslinking *** study focused on the role of Fe^(3+)and examined its effects on the physical/chemical properties of microgels under different ionic conditions and reduced or oxidized *** pH-dependent release behavior of Fe^(3+)from these microgels demonstrates their potential biomedical and environmental ***,the microgels can exhibit magnetism simply by utilizing in situ oxidation,which can be further used for targeted drug delivery and magnetic separation technologies.

关键词： Fe-alginate microgels Droplet microfluidics In situ oxidation Magnetism

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High-Pressure Torsion Affects mechanical Properties, Electrochemical Behavior, and Cellular Response to a Biomedical Ti-Nb-Zr-Ta Alloy

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materials Transactions 2025年第5期66卷 490-500页

作者： Sahay, Saurish Kesavan, Praveenkumar Yadav, Mayank Kumar Nilawar, Sagar Manivasagam, Geetha Chatterjee, Kaushik Department of Mechanical Engineering Vellore Institute of Technology Vellore632 014 India Department of Materials Engineering Indian Institute of Science Bangalore560012 India Department of Mechanical and Industrial Engineering Tallinn University of Technology Tallinn19086 Estonia Centre for Biomaterials Cellular and Molecular Theranostics CBCMT Vellore Institute of Technology Vellore632 014 India School of Healthcare Science and Engineering Vellore Institute of Technology Vellore632 014 India

This study investigates the microstructural evolution, mechanical properties, and biological response of the Ti-34Nb-2Ta-3Zr-0.5O (mass%) alloy processed by High-Pressure Torsion (HPT) at ambient temperature, focusing on its suitability for biomedical applications. The HPT process significantly increased the fraction of high-angle grain boundaries, particularly in the range of 50–60°. Grain refinement was observed after both 2 and 4 turns of HPT;ultra-fine grain fraction increased with an increase in the number of turns of HPT. No phase transformations occurred during deformation. The bulk texture indicates the formation of a fibrous texture post-HPT processing. The hardness of the samples increased up to 348 HV after 4 turns compared to the alloy not subjected to HPT (280 HV). The HPT samples demonstrated higher Ecorr and lower Icorr values, indicating improved corrosion resistance in phosphate-buffered saline. In vitro cell studies revealed that HPT did significantly affect the viability and growth of osteoblasts on the TNTZ alloy. Taken together, these results establish HPT as a promising processing route for enhancing the biomedical performance of TNTZ toward developing high-performance bone implants. [doi:10.2320/***-MC2024013] ©2025 The Japan Institute of Metals and materials.

关键词： Microhardness

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Wire- and powder-based direct energy deposition of NiTi-CuSn10-SS316L

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materials and Manufacturing Processes 2025年第8期40卷 1049-1058页

作者： Otynshiyev, Yeldar Sariyev, Bakytzhan Golman, Boris Nie, Yi Spitas, Christos Department of Chemical and Materials Engineering School of Engineering and Digital Sciences Nazarbayev University Astana Kazakhstan Department of Computational and Data Sciences Astana IT University Astana Kazakhstan Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo China Ningbo China Department of Mechanical Materials and Manufacturing Engineering Faculty of Science and Engineering University of Nottingham Ningbo China

Additive manufacturing (AM) is a rapidly advancing method with the ability to produce complex geometries layer by layer. AM shows great promise for joining dissimilar metals. However, direct energy deposition (DED) of nitinol (NiTi) and 316 stainless steel (SS316L) encounters significant difficulties due to the development of brittle Fe-Ti intermetallic compounds. A copper alloy (CuSn10) interlayer was introduced to prevent their formation. This study utilizes a wire- and powder-based DED approach, eliminating the need for feedstock switching. Fine CuSn10 powder was specifically applied for the interlayer, resulting in distinct bonding mechanisms at the interfaces. Interdiffusion resulted in fishbone microstructures at the CuSn10-SS316L interface, whereas the NiTi-CuSn10 interface exhibited dendritic structures with evenly distributed elements. Microhardness analysis revealed a sharp variation across the layers, with the highest value observed at the NiTi-CuSn10 interface (529 HV0.2). This study shows the potential of using wire- and powder-based DED technology to join dissimilar metals. © 2025 Taylor & Francis Group, LLC.

关键词： Copper alloys

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Dual-strategy regulation for enhancing hydrogen storage performance of non-activated Mg8Ni-TiO_(2)/MnO_(2)composites

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Journal of Energy Chemistry 2025年第4期103卷 543-555页

作者： Duode Zhao Xiaojiang Hou Chenlu Wang Danting Li Xinlei Xie Peixuan Zhu Xiaohui Ye Guoquan Suo Guang Yang Guangsheng Xu School of Material Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina College of Mechanical&Electrical Engineering Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Research Center of High-performance Aerospace Materials and Devices Shaanxi Polytechnic InstituteXianyang 712000ShaanxiChina

Magnesium-based materials are considered as among the most promising candidates for hydrogen storage,owing to their high storage capacity,safety,and ***,a passivation layer easily forms on the surface of magnesium,which hinders the dissociation and diffusion of *** dehydrogenation temperature,sluggish kinetics and activation difficulties hinder their commercial ***,dual-strategy regulation through nickel microalloying and surface catalysis of TiO_(2/)MnO_(2)catalysts has been proposed to obtain more active sites and diffusion channels that promote hydrogen dissociation and ***8Ni-X(X=None,TiO_(2),and TiO_(2/)MnO_(2))can achieve more than 80%hydrogen absorption without ***8Ni-5 wt%TiO_(2)/MnO_(2)absorbs hydrogen 5.27 wt%in 30 s at 200℃and desorbs 5.15 wt%in 20 min at 325℃.The activation energy(E_a)of hydrogen absorption is 52.04kJ/*** results are significantly better than those of Mg8Ni and MgH_(2)under the same *** NiTi phase is generated in the course of hydrogenation,and the coexistence of multiple phases and multivalent Ti facilitates the transport of electrons and *** dual-strategy regulation means of surface catalysis and microalloying is promising for the design of high-capacity fast hydrogen absorbed and desorbed materials without activation.

关键词： Hydrogen storage Mg8Ni TiO_(2)/MnO_(2) Microalloying Thermodynamics

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engineering Application Modeling Based on Mechanism Law for Hard Rock Disc Cutter Wear Evolution

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Rock Mechanics and Rock engineering 2025年 1-17页

作者： Wang, Lihui Kang, Yilan Zhang, Qian Li, Haipeng Delivery Equipment Support Department Army Military Transportation Academy Tianjin300161 China Key Laboratory of Modern Engineering Mechanics School of Mechanical Engineering Tianjin University Tianjin300072 China School of Materials Science and Engineering Hebei University of Technology Tianjin300130 China

Disc cutter wear and replacement significantly affect the construction efficiency and safety of hard rock tunnels. Disc cutter wear prediction has become a critical engineering problem. Based on the mechanical analysis, combined with experimental results, referring to numerical simulation analysis, this study developed a new method for predicting the wear evolution process of hard rock disc cutter. In this study, a theoretical equation of the disc cutter wear evolution is presented through the analysis on wear failure mechanism. The laws in the influence of rock joint direction angle and joint spacing on the tunnelling penetration rate are revealed based on the statistical analysis of field data and simulation data. And a new equation is proposed for calculating the contact stress. In addition, the internal relations among the disc cutter motion state, disc cutter load, rock friction performance are analyzed to propose a new equation for calculating relative slip distance. Thus, a new model was established to predict the disc cutter wear evolution, and the model was preliminarily validated using specific projects data collected from Yinsong Tunnel and Yintao Project #9 Tunnel. Owing to the comprehensive consideration of the effects of joint orientation and spacing in the hard rock mass, rock mechanics and performance characteristics, tunnelling parameters of the tunnel boring machine, cutter geometric properties, and cutter spacing on cutter wear evolution, this new model achieves real-time prediction, ensuring universality and accuracy. In further study, the laws in the influence of abnormal wear of disc cutters on TBM tunnelling loads will be analyzed to expand the prediction scope. © The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature 2025.

关键词： Rock mechanics

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Design of A Novel Statically Balanced Mechanism for End-effector-type Upper Limb Assistance

Design of A Novel Statically Balanced Mechanism for End-effe...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Meng, Qizhi Jiang, Ming Tang, Ruijie Kuo, Chin-Hsing Ceccarelli, Marco Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan Tsinghua University Department of Mechanical Engineering Beijing China School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Partial loss of upper limb motor function is a typical sequela of stroke. To help such patients actively cope with daily challenges and improve their quality of life, limb functional assistances play important roles. To this end, this paper proposes a three-degree-of-freedom parallel mechanism, which can be used for human upper limb assistance. The base of the proposed mechanism is a circular track that can be attached to the waist of the human body. The mechanism consists of two chains containing parallelogram linkage, which presents good constraints for the mobile platform and facilitates the static balance design by adding springs, thereby providing reliable assistive functions and lightweight portability. The mobility of the proposed mechanism is analyzed via the screw theory, and it is verified that the mechanism generates the aimed movements. Then, the kinematic analysis of the mechanism is presented. Finally, the static balance design is carried out in detail, and the spring constants of the three added springs are calculated. The result shows that the mechanism can achieve perfect static balance. The proposed mechanism is expected to provide a potential candidate for assistive devices and be developed into a prototype providing upper limb assistance. © 2025 IEEE.

关键词： End effectors

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Image-Based Visual Servoing for Enhanced Cooperation of Dual-Arm Manipulation

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IEEE Robotics and Automation Letters 2025年第4期10卷 3374-3381页

作者： Zhang, Zizhe Yang, Yuan Zuo, Wenqiang Song, Guangming Song, Aiguo Shi, Yang University of Pennsylvania Department of Electrical and System Engineering PhiladelphiaPA19104 United States Southeast University School of Instrument Science and Engineering Nanjing210096 China Southeast University School of Materials Science and Engineering Nanjing211189 China University of Victoria Department of Mechanical Engineering VictoriaBCV8W 2Y2 Canada

The cooperation of a pair of robot manipulators is required to manipulate a target object without any fixtures. The conventional control methods coordinate the end-effector pose of each manipulator with that of the other using their kinematics and joint coordinate measurements. Yet, the manipulators' inaccurate kinematics and joint coordinate measurements can cause significant pose synchronization errors in practice. This letter thus proposes an image-based visual servoing approach for enhancing the cooperation of a dual-arm manipulation system. On top of the classical control, the visual servoing controller lets each manipulator use its carried camera to measure the image features of the other's marker and adapt its end-effector pose with the counterpart on the move. Because visual measurements are robust to kinematic errors, the proposed control can reduce the end-effector pose synchronization errors and the fluctuations of the interaction forces of the pair of manipulators on the move. Theoretical analyses have rigorously proven the stability of the closed-loop system. Comparative experiments on real robots have substantiated the effectiveness of the proposed control. © 2025 IEEE.

关键词： End effectors

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Effect of Ce_(2)O_(3)and CaF_(2)on viscosity and structure of CaO-SiO_(2)-CaF_(2)-Ce_(2)O_(3)slag

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Journal of Rare Earths 2025年第3期43卷 620-627,I0008页

作者： Wentao Guo Xiangjun Liu Fang Liu Yongli Jin Zuolin Sun Ziqi Ding Zengwu Zhao Inner Mongolia Autonomous Region Carbon Neutrality Collaborative Innovation Center School of Materials Science and EngineeringInner Mongolia University of Science&TechnologyBaotou014010China School of Mechanical Engineering Inner Mongolia University of Science&TechnologyBaotouO1410China Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources(Inner Mongolia University of Science and Technology) Ministry of EducationSchool of Rare Earth IndustryBaotou014010China Schoolof Materials Science and Engineering Inner Mongolia University of TechnologyHohhot0000China

The influence of the growth of rare earth on the viscosity during the uniform cooling of CaO-SiO_(2-)CaF_(2)-Ce_(2)O_(3)slag was investigated by the high temperature *** results show that Ce_(2)O_(3)affects the viscosity variedly before and after the break *** higher temperatures Ce_(2)O_(3)reduces the *** the temperature is below the break temperature,at a Ce_(2)O_(3)content of≥3 mol%,a rareearth crystalline phase is observed during the slag cooling process,and the break temperature progressively increases with the increase of Ce_(2)O_(3)*** are no crystallized rare earths in the slag under the condition of Ce_(2)O_(3)concentration lower than 3 mol%.Too low or too high CaF_(2)content is found to be unfavorable for rare-earth *** increase of Ce_(2)O_(3)content facilitates the depolymerization of silica-oxygen tetrahedral ***-F bond exists between structural units,weakening the flow resistance of structural units and lowering the viscosity of slag.

关键词： Ce_(2)O_(3) Viscosity RE crystallization Silica tetrahedron structure Rare earths

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Review of Sinter-Based Additive Manufacturing (SBAM) - Status and Prospects

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2025年 72卷 S321-S326页

作者： Weissgaerber, Thomas Studnitzky, Thomas Teuber, Robert Riecker, Sebastian Reuter, Kay Zhong, Chongliang Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM Winterbergstrasse 28 Dresden01277 Germany TUD Dresden University of Technology Faculty Mechanical Engineering Institute of Materials Science Dresden01062 Germany

Today there is a huge and growing number of additive manufacturing (AM) technologies. Since LPBF (Laser Powder Bed Fusion) as dominating AM technology of metals has limitations in terms of geometries and materials as well as in productivity, sinter-based additive manufacturing (SBAM) processes are becoming increasingly important. Metal Binder Jetting (MBJ) or Fused Filament Fabrication (FFF) are the most well-known SBAM processes. Furthermore, new processes such as MoldJet (MJ), Cold Metal Fusion (CMF) or Lithography-based Metal Manufacturing (LMM) are attracting widespread attention due to their promising properties. In this review, the status of the most important sinter-based processes is highlighted and compared with LPBF. All technologies have prós and cońs, therefore a detailed analysis of the main features is the key to select the right technology for the intended application. At the same time, it is becoming apparent that there is still a development need in accompanying processes (e.g., heat treatment, sinter simulation). Future development trends and the market potential of SBAM processes will be discussed. © 2025 Journal of the Japan Society of Powder and Powder Metallurgy. All rights reserved.

关键词： Sintering

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Unlocking the stable interface in aqueous zinc-ion battery with multifunctional xylose-based electrolyte additives

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Journal of Energy Chemistry 2025年第1期100卷 770-778页

作者： Xiaoqin Li Jian Xiang Lu Qiu Xiaohan Chen Yinkun Zhao Yujue Wang Qu Yue Taotao Gao Wenlong Liu Dan Xiao Zhaoyu Jin Panpan Li Institute for Advanced Study Chengdu UniversityChengdu 610106SichuanChina School of Mechanical Engineering Chengdu UniversityChengdu 610106SichuanChina College of Food and Biological Engineering Chengdu UniversityChengdu 610106SichuanChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina College of Materials Science and Engineering Sichuan UniversityChengdu 610065SichuanChina

The growth of dendrites and the side reactions occurring at the Zn anode pose significant challenges to the commercialization of aqueous Zn-ion batteries(AZIBs). These challenges arise from the inherent conflict between mass transfer and electrochemical kinetics. In this study, we propose the use of a multifunctional electrolyte additive based on the xylose(Xylo) molecule to address these issues by modulating the solvation structure and electrode/electrolyte interface, thereby stabilizing the Zn anode. The introduction of the additive alters the solvation structure, creating steric hindrance that impedes charge transfer and then reduces electrochemical kinetics. Furthermore, in-situ analyses demonstrate that the reconstructed electrode/electrolyte interface facilitates stable and rapid Zn^(2+)ion migration and suppresses corrosion and hydrogen evolution reactions. As a result, symmetric cells incorporating the Xylo additive exhibit significantly enhanced reversibility during the Zn plating/stripping process, with an impressively long lifespan of up to 1986 h, compared to cells using pure ZnSO4electrolyte. When combined with a polyaniline cathode, the full cells demonstrate improved capacity and long-term cyclic stability. This work offers an effective direction for improving the stability of Zn anode via electrolyte design, as well as highperformance AZIBs.

关键词： Aqueous Zn-ion battery Electrolyte additive Solvation structure Electrode/electrolyte interface Zn anode

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