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Fabrication and properties of textured ZnO-based varistor ceramics by alginate gelation and templated grain growth

materials Letters 2025年 395卷

作者： Jie, Xi Zhou, Jian Liu, Guizhen Gu, Yang Feng, Zhiliang Zhao, Tengfei Ding, Zhongjun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China National Deep Sea Center Qingdao266237 China

This study proposes a novel and environment-friendly ceramic texturing method combining alginate gelation and ZnO-templated grain growth. Highly textured ZnO varistor ceramics (Lotgering factor 0.85) were achieved through shear-induced orientation alignment in aqueous alginate gels. The textured samples exhibited anisotropic breakdown voltages (293 V/mm in ⊥ direction vs. 185 V/mm in || direction), delivering an enhanced voltage gradient of 293 V/mm and a high nonlinear coefficient of 36, 58 % higher voltage gradient than isotropic counterparts, advancing environmentally friendly processing for grain boundary engineering. Results demonstrate that this method effectively improves the microstructure and electrical performance of ZnO varistor ceramics, providing essential support for developing high-performance ZnO varistors. © 2025 Elsevier B.V.

关键词： II-VI semiconductors

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P2/P3 Biphasic layered oxide cathode enabled by additional electron-holes on oxygen for high-capacity sodium-ion batteries

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Journal of materials Science & technology 2025年 238卷 230-237页

作者： Hassan Muhammad Mudassir Chenghao Xie Fanjie Xia Rui Fang Qiushuang Chen Zhaopei Liu Tiancheng Dong Fang Liu Shan Hu Zelang Jian Jinsong Wu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Nanostructure Research Center (NRC) Wuhan University of Technology Wuhan 430070 China

Layered transition metal (TM) oxides have gained significant attention for achieving high specific capacity and energy density utilizing the lattice oxygen redox for sodium-ion batteries. However, the highly oxidized lattice oxygen cannot be fully reduced due to irreversible structural deformation, phase transition, and sluggish kinetics. Herein, the Cobalt (Co) content was tuned to synthesize a P2/P3- biphasic layered oxide cathode Na 0.72 Li 0.24 Co 0.12 Mn 0.64 O 2 (NLM-Co12%), which exhibits pronounced lattice oxygen activity, leading to exceptional capacity and improved cyclability with superior structural stability. The distinct honeycomb ordering induces highly delocalized π-type interactions that generate additional electron holes on oxygen, providing a record energy density and specific capacity of 767.98 Wh kg −1 and 287.19 mAh g −1 , respectively. The strategic incorporation of Co in the TM layers mitigates the sluggish kinetics during the electrochemical reactions and improves the diffusion kinetics. The addition of electron holes on Oxygen (O) is comprehensively investigated through different electrochemical and state-of-the-art spectroscopic techniques. Furthermore, in situ-XRD reveals the phase transition during Na + insertion/extraction is eliminated due to the synergistic effect of the P2/P3 biphasic structure achieving superior structural stability. Benefiting from the superstructure ordering and P2/P3 biphasic structure, the NLM-Co12% electrode demonstrates simultaneously high lattice-oxygen activity and excellent structural stability, thus resulting in remarkable energy density and specific capacity.

关键词： Sodium-ion batteries

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基于织构工程优化的n型Ag2Se薄膜热电性能增强研究（英文）

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Science China materials 2025年第5期68卷 1630-1637页

作者：张新洋贺丹琪陈李莎黄同露叶先锋李浩天朱婉婷聂晓蕾余健张玉魏平赵文俞张清杰 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology School of Materials Science and Engineering Jiujiang University Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory

柔性热电发电技术日益被认为是为可穿戴电子设备供电的有效解决方案.然而,n型柔性薄膜的性能局限性限制了其更广泛的应用.本研究通过织构工程技术获得了高性能n型Ag2Se薄膜,在300 K时,功率因子高达2.14 mW m-1K-2.我们采用简单的蒸发镀... 详细信息

柔性热电发电技术日益被认为是为可穿戴电子设备供电的有效解决方案.然而,n型柔性薄膜的性能局限性限制了其更广泛的应用.本研究通过织构工程技术获得了高性能n型Ag2Se薄膜,在300 K时,功率因子高达2.14 mW m-1K-2.我们采用简单的蒸发镀膜技术,结合前驱体调控策略,制备了（201）取向的n型Ag2Se薄膜.实验和理论分析均表明,这种择优取向的Ag2Se薄膜具有高迁移率和高Seebeck系数.此外,纳米孔和随机面内取向结构的引入,显著散射了不同波长声子,从而使Ag2Se热导率进一步降低.最终,在363 K时,Ag2Se薄膜ZT值高达0.73.本研究不仅提出了一种调控Ag2Se薄膜晶体取向的策略方法,还为开发高性能热电薄膜材料创造了新的前景.

关键词： Ag2Se film texture engineering preferred orientation electrical properties thermoelectric performance

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Investigation of the synergistic evolution of mechanical properties governed by composition–process–microstructure coupling in ultra-long flow die-cast aluminum alloys

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Journal of Manufacturing Processes 2025年 145卷 508-521页

作者： Yang, Dong Tan, Yunxiang Liao, Pingwei Jiang, Daxiu Wu, Xinxing Wang, Xuefeng Zhao, Haidong Han, Zhiqiang Min, Junying Xu, Qingyan School of Mechanical Engineering Tongji University Shanghai201804 China Xiaomi Automobile Technology Co. Ltd. Beijing100176 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing100084 China National Engineering Research Center of Near-Net-Shape for Metallic Materials South China University of Technology Guangzhou510640 China

Giga casting technology has become integral to automotive lightweight manufacturing, yet current studies mainly address small-scale castings with limited dimensions and moderate casting parameters, leaving substantial gaps in knowledge regarding ultra-large-scale integrated die-cast aluminum components. To address this, we present a comprehensive investigation of an S-profile structural casting with a record-setting flow length of 3500 mm, manufactured via high-vacuum die-casting under an 1800-ton clamping force. Comprehensive experimental methodologies were employed to systematically evaluate the effects of alloy composition, flow length, wall thickness, filling time, die temperature, and casting pressure on the microstructural characteristics, defect formation, and resultant mechanical properties. key findings revealed that flow length significantly affects microstructural uniformity and porosity distribution: pore sizes drastically increased from negligible at 1000 mm to approximately 100 μm at 3000 mm, accompanied by reductions in yield strength (from 108.69 MPa to 96.63 MPa), ultimate tensile strength (from 226.58 MPa to 189.46 MPa), and elongation (from 10.58 % to 3.05 %). Additionally, alloy composition critically influenced mechanical behavior;Alloy C, containing higher Si (8.0–8.5 wt%) and moderate Cu (0.1–0.5 wt%), exhibited the highest yield strength (122.81 MPa) but lower ductility (5.29 % elongation) and significant variability in tensile strength. Conversely, Alloy B provided balanced properties, achieving an optimal combination of strength (UTS ~249.26 MPa, YS ~116.31 MPa) and ductility (elongation ~6.34 %). Random forest regression analysis further identified material composition as the predominant influencing factor for strength attributes (importance scores of 0.69 for YS and 0.36 for UTS), while emphasizing the critical influence of flow length on ductility (importance score of 0.92). These insights establish a robust theoretical foundation for op

关键词： Aluminum alloys

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Influences of particle size and composition on the hydrolysis behavior of MgO·nAl2O3 spinel

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Ceramics International 2025年

作者： Cao, Mengying Tu, Guangsheng Huang, Qing Liao, Jiaxing Jing, Zhengyang Chen, Bowen Tu, Bingtian Wang, Hao Wang, Weimin Fu, Zhengyi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China Hubei Longzhong Laboratory Hubei Xiangyang441000 China

The hydrolysis characteristic of MgO·nAl2O3 powders poses significant challenges for fabricating large-sized and complex-shaped transparent ceramic components. In this work, the hydrolysis behavior of MgO·nAl2O3 powders with designed particle size and chemical composition was systematically investigated. The results ascertained that coarse MgAl2O4 powders synthesized at higher temperatures exhibited reduced surface-active sites, and alumina-rich spinel surfaces exposed decreased unsaturated Mg atoms that catalyze water dissociation. The OH− concentrations in MgAl2O4-coarse and MgO·1.8Al2O3 suspensions were 63 % and 32 % of that in MgAl2O4-fine one, respectively, indicating an effective inhibition of the hydrolysis reaction. Ultimately, the hydrolysis mechanism of MgO·nAl2O3 was elucidated, where the boehmite protective layer (∼15 nm) formed on the particle surface after hydrolysis. This study provides a fundamental understanding of the surface properties and hydrolysis behavior of MgO·nAl2O3, which is of great significance for the preparation of spinel transparent ceramics using aqueous gel-casting. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Surface reactions

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materials and devices for high‐density,high‐throughput micro‐electrocorticography arrays

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Fundamental Research 2025年第1期5卷 17-28页

作者： Yang Xie Yanxiu Peng Jinhong Guo Muyang Liu Bozhen Zhang Lan Yin He Ding Xing Sheng Department of Electronic Engineering Beijing National Research Center for Information Science and TechnologyInstitute for Precision MedicineLaboratory of Flexible Electronics TechnologyIDG/McGovern Institute for Brain ResearchTsinghua UniversityBeijing 100084China Beijing Engineering Research Center of Mixed Reality and Advanced Display School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering The Key Laboratory of Advanced Materials of Ministry of EducationState Key Laboratory of New Ceramics and Fine ProcessingLaboratory of Flexible Electronics TechnologyTsinghua UniversityBeijing 100084China

The pursuit of precisely recording and localizing neural activities in brain cortical regions drives the development of advanced electrocorticography(ECoG)*** progress has led to the emergence of micro-ECoG(μECoG)devices with sub-millimeter *** review presents the current research status,development directions,potential innovations and applications of high-density,high-throughputμECoG ***,we summarize the challenges associated with accurately recording single or multiple neurons using existingμECoG devices,including passive multielectrode and active transistor ***,we focus on cutting-edge advancements in passiveμECoG devices by discussing the design principles and fabrication strategies to optimize three key parameters:impedance,mechanical flexibility,and ***,recent findings highlight the need for further research and development in active transistor arrays,including silicon,metal oxide,and solution-gated *** active transistor arrays have the potential to unlock the capabilities of high-density,high-throughputμECoG devices and overcome the limitations of passive multielectrode *** review explores the potential innovations and applications ofμECoG devices,showcasing their effectiveness for both brain science research and clinical applications.

关键词： Electrocorticography Micro-electrocorticography Flexible electronics Bioelectronics Neural electrode array

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Highly efficient hydrogenation of NO to NH_(3)via a Fe_(2)O_(3)/TiO_(2)catalyst

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Chinese Journal of Catalysis 2025年第4期71卷 330-339页

作者： Yanqin Li Wenlong Wang Junqi Tian Dan Cui Jun Yuan Bin Fang Nianliang Yin Zelong Li Feng Yu School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan School of Chemistry and Chemical EngineeringShihezi UniversityShihezi 832003XinjiangChina Key Laboratory of Advanced Catalysis Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000GansuChina Carbon Neutralization and Environmental Catalytic Technology Laboratory Bingtuan Industrial Technology Research InstituteShihezi UniversityShihezi 832003XinjiangChina School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026AnhuiChina

Nitrogen oxides(NO_(x))present in flue gas are economically renewable N1 *** traditional selective catalytic reduction processes that convert NO into N_(2),redirecting NO towards the synthesis of value-added NH_(3)offers significant practical *** this study,a Ti-based metal-organic framework(Ti-MOF),specifically MIL-125,was utilized as a support for Fe,which was subsequently calcined at 400℃to produce a Fe_(2)O_(3)/TiO_(2)-MOF *** resulting catalyst demonstrated exceptional performance,achieving 99%NO conversion and 95%NH_(3)selectivity under optimal conditions of 450℃,0.1 MPa,and a gas hourly space velocity of 38000 mL g^(–1)h^(−1).Additionally,the catalyst exhibited excellent stability and resistance to water and *** high efficiency of Fe_(2)O_(3)/TiO_(2)-MOF is attributed to the abundance of Fe^(2+)sites at the reaction temperature,which enhances NO adsorption and ***,density functional theory calculations suggest that NO undergoes hydrogenation at the N-terminus on the Fe_(2)O_(3)/TiO_(2)-MOF surface,leading directly to NH_(3)synthesis rather than dissociation followed by *** catalyst presents a novel approach for converting NO_(x)into high-value chemical products.

关键词： Nitrogen oxides Synthetic ammonia NO hydrogenation Selective catalytic reduction Denitration

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Research on the burst failure analysis method of type IV cylinders based on the fiber strength reduction effect

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2025年第5期42卷 2567-2582页

作者： Li, Ruiqi Hu, Haixiao Li, Shuxin Chen, Hongda Cao, Dongfeng Liu, Hao Zheng, Kaidong Zhang, Yu Liu, Rui State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China National Energy Key Laboratory for New Hydrogen-ammonia Energy Technologies Foshan Xianhu Laboratory Foshan528200 China School of Science Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China General Research and Development Institute China FAW Co. Changchun130000 China

Composite material hydrogen storage cylinders are the most effective solution for high-pressure gaseous hydrogen storage. The carbon fiber fully wrapped plastic liner cylinder (Type IV cylinder) is the most important potential in the development of hydrogen storage. Accurately predicting the burst pressure and failure mode of type IV cylinders is basement for the lightweight design of these cylinders. Current burst failure prediction methods are developed base on traditional laminated structural models, where the influence of fiber bundles cross undulation that occurs during the helical winding process are not considered. This paper comprehensively investigated the influence of fiber bundles cross undulation on the fiber strength by combining numerical and experimental approaches, and a failure prediction method which takes into account of the strength knock-down effect was developed for type IV cylinders. The burst pressures and failure locations of three different types of IV cylinders were predicted and compared with the ones that predicted by traditional method which does not consider the strength knock-down effect. The physical bursting experiments were conducted, and the results validate that the numerical analysis method considering the strength knock-down effect can give more accurate prediction of the failure location and reduce the prediction error of the bursting pressure, the maximum error is reduced from +15.42% to +6.07%. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： Convergence of numerical methods

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Spatial confinement of free-standing graphene sponge enables excellent stability of conversion-type Fe_(2)O_(3)anode for sodium storage

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Chinese Chemical Letters 2025年第3期36卷 544-549页

作者： Jun Dong Senyuan Tan Sunbin Yang Yalong Jiang Ruxing Wang Jian Ao Zilun Chen Chaohai Zhang Qinyou An Xiaoxing Zhang Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of TechnologyWuhan 430068China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Nanjing University of Aeronautics and Astronautics Nanjing 210016China

Conversion-type anode materials are highly desirable for Na-ion batteries(NIBs)due to their high theoretical ***,the active materials undergo severe expansion and pulverization during the sodiation,resulting in inferior cycling ***,a self-supporting three-dimensional(3D)graphene sponge decorated with Fe_(2)O_(3)nanocubes(rGO@Fe_(2)O_(3))is ***,the 3D graphene sponge with resilience and high porosity benefits to accommodate the volume expansion of the Fe_(2)O_(3)nanocubes and facilitates the rapid electrons/ions transport,enabling spatial confinement to achieve outstanding ***,the free-standing rGO@Fe_(2)O_(3)can be directly used as an electrode without additional binders and conductive additives,which helps to obtain a higher energy *** on the total mass of the rGO@Fe_(2)O_(3)material,the rGO@Fe_(2)O_(3)anode presents a specific capacity of 859 mAh/g at 0.1 A/*** also delivers an impressive cycling performance(327 mAh/g after 2000 cycles at 1 A/g)and a superior rate capacity(162mAh/g at 20 A/g).The coin-type Na_(3)V_(2)(PO_(4))_(3)@C//rGO@Fe_(2)O_(3)NIB exhibits an energy density of 265.3Wh/*** unique 3D ionic/electronic conductive network may provide new strategies to design advanced conversion-type anode materials for high-performance NIBs.

关键词： Conversion-type anode Spatial confinement Fe_(2)O_(3) Graphene network Self-supporting Sodium-ion batteries

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Finite Element Analysis and Experiments on the interaction between pulsed laser and capillaries in skin tissue 7

Finite Element Analysis and Experiments on the interaction b...

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7th Optics Young Scientist Summit, OYSS 2024

作者： Sun, Bingheng Ren, Zhong Liang, Gaoqiang Jiangxi Provincial Key Laboratory of Advanced Electronic Materials and Devices Jiangxi Science and Technology Normal University Nanchang330038 China Key Laboratory of Optic-electronic Detection and Information Processing of Nanchang City Jiangxi Science and Technology Normal University Nanchang330038 China

ISBN: (数字)9781510688377

ISBN: (纸本)9781510688360

Photoacoustic imaging is a kind of rapidly advancing noninvasive detection technology based on the photon-induced-acoustic effect, which holds the significant potential applications in the biomedical imaging diagnosis field. This technique merges the high contrast capabilities of optical imaging with the deep penetration and high resolution of acoustic imaging. In our work, to study the interaction mechanisms and photoacoustic effects between pulsed laser and capillaries in skin tissue, finite element analysis (FEA) based on COMSOL multiphysis software was employed. Based on the established finite element bio-tissue model, the photoacoustic effect was fully and completely represented as a sequence of light absorption, thermal expansion, and ultrasound wave generation in the bio-tissue, involving the coupling of multiple physical fields and the numerical resolution of partial differential equations. Moreover, in our study, the effects of varying induced wavelengths, capillaries depths in tissue, and absorber sizes on the time-domain photoacoustic signals and photoacoustic intensity were numerical investigated. Numerical results show that the blood in capillaries has stronger photoacoustic effect in the visible light waveband due to the characteristic absorption of hemoglobin in capillaries. The photoacoustic intensity decreases with the increase of capillary radius and depth. To validate the availability of the numerical simulation, the corresponding photoacoustic experiments were performed. In the experiments, we constructed a photoacoustic microscopy detection system and experimentally studied the photoacoustic effects of several influence factors. The experimental results confirm the accuracy of our numerical simulations and provide theoretical insights for future applications of vascular or capillaries photoacoustic imaging in the biomedical field. © 2025 SPIE.

关键词： Tissue

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