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Improvement of Mechanical Properties and Wall Thickness Uniformity of Hollow Ceramic Spheres by Biaxial Rotation Slurry Injection technology

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Journal of Wuhan University of technology(materials Science) 2025年第3期 619-626页

作者：王秋阳周建 LIU Guizhen WANG Lin DING Zhongjun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology National Deep Sea Center

Ceramic hollow spheres have great potential for deep-sea ***,the irregularity of the conventional molding process,among other reasons,results in low wall thickness uniformity of hollow *** solve this problem,in this work,we developed a biaxial rotation grouting process for deep-sea ceramic hollow buoyancy spheres,which improves the drawbacks of the traditional rotary grouting method that results in poor wall thickness uniformity of the hollow spheres due to its irregular rotational *** this paper,an experimental study was carried out to investigate the effects of different rotational methods,rotational speeds,rotational time,solid phase content,*** the wall thickness uniformity of ceramic hollow *** results show that the hollow floating balls prepared by the biaxial rotation method have the lowest wall thickness standard deviation (0.04) when the rotation speed is 60 rpm,the molding time is 8 min,and the solid phase content is 70 wt%.After the hydrostatic pressure test of 120 MPa,the hydrostatic compressive strength of hollow spheres prepared by the biaxial rotation method was increased by 31.67% compared with that of the traditional process.

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Gallium-based liquid metals for lithium-ion batteries

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Interdisciplinary materials 2022年第3期1卷 354-372页

作者： Bin-Wei Zhang Long Ren Yun-Xiao Wang Xun Xu Yi Du Shi-Xue Dou College of Chemistry and Chemical Engineering Chongqing UniversityChongqingChina Center of Advanced Energy Technology and Electrochemistry Chongqing UniversityChongqingChina Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongNorth WollongongNew South WalesAustralia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina BUAA-UOW Joint Research Centre and School of Physics Beihang UniversityBeijingChina

Lithium-ion batteries(LIBs)are one of the most exciting inventions of the 20th century and have been widely employed in modern *** have powered many of our electronics,such as laptop computers,smartphones,and even large-scale energy storage *** the development of modern technology,next-generation LIBs with higher energy density are in demand.A number of electrode materials with high theoretical capacity,including Sn,Si,Li metal anode,and S cathode materials,have been ***,they usually suffer from structural or interface failure during cycling,limiting their practical ***-based liquid metals(LMs)possess self-healing capability,fluidity,and metallic advantages so they have been employed as self-healing skeletons or interfacial protective layers to minimize the negative impact of volume expansion or dendritic growth on the electrode ***,the features of Ga-based LMs are briefly discussed to indicate their potential for battery *** addition,recent developments on Ga-based LMs applied in LIBs have been summarized,including from the aspects of anodes,cathodes,and ***,future opportunities and challenges for the development of Ga-based LMs in LIBs are highlighted.

关键词： anode cathode electrolyte gallium-based liquid metals lithium-ion batteries

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High infrared emissivity and heat dissipation ability of SiC/Edge-oxidized Graphene/ PVDF-HFP coatings near room temperature

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Carbon 2025年 242卷

作者： Yu, Xiaoxiao Zhang, Yu Nie, Xiaolei Song, Wei Chen, Lisha Li, Haotian Zhu, Wanting He, Danqi Liu, Mingrui Wei, Ping Zhao, Wenyu Zhang, Qingjie State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu 528000 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China

High infrared emissivity and excellent thermal conduction capability are crucial for the heat dissipation performance of heat dissipation coatings, which are applicable in the thermal management of modern electronic components. Herein, SiC nanowires/Edge-oxidized graphene/polyvinylidene fluoride hexafluoropropylene (SiC NWs/EOG/PVDF-HFP) composite coatings with three-dimensional thermal conductivity network structure were successfully prepared by the in-situ growth of SiC NWs between EOG layers through high-temperature carbothermal reduction reaction. The out-of-plane thermal diffusivity of the SiC NWs/EOG/PVDF-HFP composite coating was increased by 27 %, as compared with that of the EOG/PVDF-HFP coating, which was originating from the enhanced phonon conduction in the vertical direction by the in-situ growth of SiC NWs. The stacking faults and twin crystals generated by SiC NWs, the structural defects introduced by EOG, and the multi-scale surfaces and interfaces introduced by EOG and SiC NWs have jointly improved the infrared emissivity, enabling the SiC NWs/EOG/PVDF-HFP composite coating achieved an emissivity of 0.92. The copper plate coated with SiC NWs/EOG/PVDF-HFP coating achieved a temperature drop benefit of 9.3 °C, increasing by 126 %, 93 % and 78 %, respectively, as compared with that of the copper plate coated with EOG/PVDF-HFP coating, the copper plate coated with mechanically compounded SiC/EOG/PVDF-HFP coating, and the copper plate coated with mechanically compounded SiC NWs-EOG/PVDF-HFP coating. These findings highlight the great potential of the SiC NWs/EOG/PVDF-HFP composite coatings for application in the thermal management of electronic devices. © 2025 Elsevier Ltd

关键词： Stacking faults

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Light tuning CO/H_(2)composition on Ag:Unraveling CO_(2)mass transfer and electron-phonon coupling in plasmon-enhanced electrocatalysis

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Nano Research 2025年第1期18卷 173-185页

作者： Rui Lin Dong Fan Luca MBerger Thomas Possmayer Yu Zhou Jiexin Zhu Xingbao Chen Wen Luo Lars Allmendinger Andreas Tittl Leonardo de Souza Menezes Guillaume Maurin Shihe Yang and Stefan AMaier Nanoinstitute Munich Faculty of PhysicsLudwig-Maximilians-Universität München80539 MunichGermany Institut Charles Gerhardt Montpellier UMR 5253 CNRS ENSCM UniversitéMontpellierPlace E.Bataillon34090 MontpellierFrance Guangdong Provincial Key Lab of Nano-Micro Material Research School of Advanced MaterialsPeking University Shenzhen Graduate SchoolShenzhen 518055China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Faculty of Chemistry and Pharmacy Ludwig-Maximilians-Universität München81377 MunichGermany Departamento de Física Universidade Federal de Pernambuco50670-901 Recife-PEBrazil School of Physics and Astronomy Monash University Clayton CampusMelbourneVictoria 3800Australia Department of Physics Imperial College LondonSW72AZ LondonUK

Plasmon-enhanced electrocatalysis(PEEC)is an emerging approach to mitigate CO_(2)*** mechanisms behind CO_(2)adsorption and reduction at the catalyst-electrolyte interface in PEEC still need to be further ***,we employ a well-defined Ag nanostructure to elucidate these pivotal *** shining light with wavelengths of 625,525,405 nm on Ag,an adjustable CO/H_(2)ratio from 35 to 1 can be *** reaction pathway changing under plasmonic excitation does not originate from the lowered CO_(2)mass transfer in the vicinity of Ag,as the electrochemical quartz crystal microbalance results unravel that a slightly elevated temperature in bulk electrolyte caused by light irradiation cannot weaken the CO_(2)adsorption at the Ag catalyst-electrolyte *** calculations reveal that optical excitation towards shorter wavelengths leads to a progressive lowered energy barrier for H_(2)formation together with an enhanced energy barrier for^(*)COOH *** thermodynamically suppressed,CO_(2)reduction can still be improved kinetically by optimizing the excitation wavelength and intensity,being accompanied with the enhanced *** absorption spectroscopy results further correlate the higher photocurrent with a prolonged electron-phonon coupling time,verifying that the improvement of CO_(2)reduction kinetics in PEEC can be realized by hot electron harnessing.

关键词： plasmonic catalysis photoelectrochemical CO_(2)reduction CO/H_(2)ratio hot electron generation electronphonon coupling thermal effect

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Textured silicon nitride ceramics with enhanced properties fabricated by high pressure sintering

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Ceramics International 2025年

作者： Tao, Haoyu Qin, Xiaowei Sui, Jiahua Zou, Ji Wang, Weimin Ji, Wei Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Silicon nitride (Si3N4) ceramics with a textured morphology were prepared via high-pressure sintering in this study. The mechanical and thermal properties of the prepared materials in different orientations were investigated. Compared with the Si3N4 ceramics prepared at 1700 °C under low pressure of 50 MPa, the specimens prepared under high pressure of 200 MPa showed an obvious textured microstructure and a high fracture toughness (8.2 ± 0.5 MPa m1/2). Especially, the thermal conductivity was determined to be 105 W m−1 K−1 along the texture direction and 64 W m−1 K−1 in the vertical direction, respectively. The as-prepared Si3N4 with a morphological texture was anisotropic in hardness and toughness. High temperature and high pressure played a crucial role in the formation of Si3N4 ceramic texture and the enhancement of comprehensive properties. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

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Ionic liquid engineering enabled in-plane orientated 1D perovskite nanorods for efficient mixed-dimensional perovskite photovoltaics

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InfoMat 2023年第8期5卷 81-93页

作者： Fei Wang Dawei Duan Kang Zhou YZBXue Xiao Liang Xianfang Zhou Chuangye Ge Chao Zhou Jin Xiang Jiajie Zhu Quanyao Zhu Haoran Lin Yumeng Shi Yonghua Chen Gang Li Hanlin Hu Hoffmann Institute of Advanced Materials Shenzhen PolytechnicShenzhenthe People's Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhanthe People's Republic of China Oxford Instruments Technology(Shanghai)Co.Ltd. Shanghaithe People's Republic of China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhenthe People's Republic of China School of Physics Science and Engineering Tongji UniversityShanghaithe People's Republic of China Key Laboratory of Flexible Electronics(KLoFE)&Institute of Advanced Materials(IAM) School of Flexible Electronics(Future Technologies)Nanjing Tech University(NanjingTech)Nanjingthe People's Republic of China Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityKowloonHong Kongthe People's Republic of China

Mixed-dimensional engineering of perovskite material has been demonstrated as a facile and promising strategy to improve both photovoltaic performance and long-term stability of perovskite solar cells(PSCs).In this study,we report an in-plane preferred orientation of 1D perovskite induced by an ionic liquid(IL)of 1-(3-cyanopropyl)-3-methylimidazolium chloride(CPMIMCl)for the first time via sequential deposition approach,leading to a mixed dimensional perovskite thin *** generated one-dimensional(1D)CPMIMPbI3 with in-plane orientation resides at the grain boundaries of three-dimensional(3D)perovskite can be appreciably observed from the morphology level,leading to creation of high-quality films with large grain size with more efficient defect ***,the dispersion of IL in the bulk phase of perovskite material allows for the formation of 1D perovskite for multiple level passivation to inhibit non-radiative recombination and optimize carrier *** IL engineering strategy not only yields a mixed-dimensional perovskite heterostructure with in-plane orientation 1D perovskite nano-rods but also significantly improves the opto-electronic property with suppressed trap *** a result,the CPMIMCl-treated PSCs show an enhanced photovoltaic performance with a champion power conversion efficiency(PCE)up to 24.13%.More importantly,benefiting from the hydrophobicity of formed 1D perovskite and defects suppression,the corresponding PSC demonstrates an excellent longterm stability and maintain 97.1%of its pristine PCE at 25C under 50%RH condition over 1000 *** research provides an innovative perspective for employing the low dimensional engineering to optimize the performance and stability of photovoltaic devices.

关键词： 1D/3D perovskite ionic liquid perovskite solar cells stability

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Pressure-controlled synergy between dehydrogenation and densification in TiH2 sintering

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Journal of the European Ceramic Society 2025年第14期45卷

作者： Hu, Tianxiao Lin, Mengting Zou, Ji Wang, Weimin Ji, Wei Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Titanium hydride (TiH2) ceramics have become key high-performance hydrogen storage materials. However, the sintering of TiH2 faces significant challenges due to the low temperature of dehydrogenation reaction (300–800 °C). In this study, high-pressure spark plasma sintering (HPSPS) technique was employed to successfully realize low-temperature high-density preparation by suppressing dehydrogenation and regulating densification kinetics under a high pressure (200 MPa). Under the optimized conditions (750 °C, 200 MPa, and 10 min), a fully dense single face-centered cubic (FCC) δ-Ti(H) phase bulk material was fabricated. The initial dehydrogenation temperature of samples fabricated by high-pressure spark plasma sintering (HPSPS) was higher than the dehydrogenation temperature of powder. Mechanistic analyses showed that high pressure inhibited hydrogen escape by compressing pores while promoting particle plastic flow and interfacial bonding. Increasing holding time from 5 to 10 min enhanced diffusion-dominated densification but exacerbated dehydrogenation-induced porosity under low-pressure conditions. The study shows that high pressure compaction can alleviate the contradiction between traditional high temperature densification and low temperature decomposition of TiH2, and offers a new strategy for the efficient densification of materials for low temperature decomposition. © 2025 Elsevier Ltd

关键词： Densification

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Achieving enhanced thermoelectric and mechanical performance in p-type bismuth telluride through constrained hot deformation

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Ceramics International 2025年

作者： Chen, Quansheng Ji, Chen Yu, Jian Hua, Lin Zhao, Wenyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Jiujiang University Jiujiang332005 China Hubei Key Laboratory of Advanced Technology for Automobile Components Wuhan University of Technology Wuhan430070 China

Bi2Te3-based alloys remain the only commercially available thermoelectric (TE) materials. However, their practical applications are severely constrained by the inferior mechanical performance of the zone melting (ZM) ingot. Herein, a simple constrained hot deformation (CHD) technology was developed to prepare the p-type Bi0.5Sb1.5Te3 polycrystalline materials derived from ZM ingots. It was discovered that the deformation process has negligible impact on the phase composition, but can efficiently refine the grains to approximately 5 μm through the dynamic recrystallization and simultaneously introduce high-density dislocations. Although the donor-like effect induced by deformation would obviously deteriorate the electrical conductivity, the recovery effect triggered by high deformation temperature can effectively optimize the carrier concentration and thus alleviate the degradation of power factor. The material deformed at 773 K maintains a relatively high power factor ∼3.33 mW K−2 m−1 at 300 K, together with a significantly decreased lattice thermal conductivity ∼0.59 W m−1 K−1, and an improved zT ∼1.1 was obtained ultimately. More importantly, the deformed materials show a significant improvement in mechanical performance due to the grain refinement. A maximum average Vickers hardness of 0.67 GPa was achieved for the material deformed at 723 K, which is ∼40 % higher than that of the ZM ingot. Our work indicates the simple CHD is an efficient technology to synergistically enhance both TE and mechanical properties of Bi2Te3-based ZM ingot. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Polycrystalline materials

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Structure and enhanced dielectric temperature stability of BaTiO3- based ceramics by Ca ion B site-doping

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Journal of Materiomics 2021年第2期7卷 295-301页

作者： Xuewen Jiang Hua Hao Yang Yang Enhao Zhou Shujun Zhang Ping Wei Minghe Cao Zhonghua Yao Hanxing Liu Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Material Science and EngineeringWuhan University of TechnologyWuhan430070China Institute for Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of WollongongWollongongNSW2500Australia Nanostructure Research Centre Wuhan University of TechnologyWuhan430070China

Capacitor is an important part of many electronic devices,so the temperature stability as one key parameter of capacitor needs to be improved constantly for meeting the requirements of various application ***,combined with the X-ray diffraction(XRD),selected area electron diffraction(SAED)and Vienna Ab-initio Simulation Package(VASP)calculation,it was confirmed that Ca ion can substitute the Ti site in the BaTi1-xCaxO3-x[BTC100](0≤x≤0.05)ceramics synthesized by solid-phase method which greatly improved the low-temperature stability of dielectric ***,introducing Bi3þand Zn^(2+) into BTC4 to form(1-y)BaTi0.6Ca0.04O2.96-yBi(Zn_(0.5)Ti_(0.5))O_(3)[(1-y)BTC4-yBZT](0.1≤y≤0.2)ceramics can further improve the dielectric-temperature stability by means of diffused phase transition and core-shell *** importantly,the 0.85BTC4-0.15BZT ceramics with a pseudocubic perovskite structure possessed a temperature coefficient of capacitance at 25℃(TCC25℃)being less than±15%over a wide temperature range of 55℃-200℃and a temperate dielectric constant(ε=1060)and low dielectric loss(tanδ=1.5%),which measure up to the higher standard in the current capacitor industry such as X9R requirements.

关键词： BaTiO3 Ca substituted X9R capacitors Dielectric properties

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Flexible and highly-sensitive pressure sensor based on controllably oxidized MXene

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InfoMat 2022年第9期4卷 60-71页

作者： Yanan Ma Yongfa Cheng Jian Wang Si Fu Mengjun Zhou Yue Yang Baowen Li Xin Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices&International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina School of Mathematics Physics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyanChina Center for Nanoscale Characterization&Devices(CNCD) Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)WuhanChina Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefeiChina State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

Conductive Ti_(3)C_(2)T_(x)MXenes have been widely investigated for the construction of flexible and highly-sensitive pressure *** the inevitable oxidation of solution-processed MXene has been recognized,the effect of the irreversible oxidation of MXene on its electrical conductivity and sensing properties is yet to be ***,we construct a highly-sensitive and degradable piezoresistive pressure sensor by coating Ti_(3)C_(2)T_(x)MXene flakes with different degrees of in situ oxidation onto paper substrates using the dipping-drying *** situ oxidation can tune the intrinsic resistance and expand the interlayer distance of MXene *** partially oxidized MXene-based piezoresistive pressure sensor exhibits a high sensitivity of 28.43 kPa^(-1),which is greater than those of pristine MXene,over-oxidized MXene,and state-of-the-art paper-based pressure ***,these sensors exhibit a short response time of 98.3 ms,good durability over 5000 measurement cycles,and a low force detection limit of 0.8 ***,MXene-based sensing elements are easily degraded and environmentally *** MXene-based pressure sensor shows promise for practical applications in tracking body movements,sports coaching,remote health monitoring,and human–computer interactions.

关键词： adjustable sensitivity in situ oxidation interlayer distance MXene pressure sensor

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