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75th World Foundry Congress, WFC 2024

作者： Wang, Haoyuan Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

This study explores the stereolithography-based fabrication of aluminum-based ceramic cores, aimed at minimizing sintering shrinkage. Stereolithography-based ceramic cores often exhibit significant shrinkage during sintering, limiting their applications. In this work, by adding silica and kyanite into the alumina, high mechanical performance while minimizing shrinkage were achieved. Results demonstrate that cores with 22% silica and 8% kyanite show nearly zero shrinkage, making them suitable for complex, high-precision investment casting applications. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Kyanite

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Rectification Effect of 3D-Printed Filters with Deflectors 75

Rectification Effect of 3D-Printed Filters with Deflectors

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75th World Foundry Congress, WFC 2024

作者： Li, Chaoke Wang, Haoyuan Feng, Qian Hu, Kehui Lu, Zhigang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory of Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Tsinghua University Beijing100084 China

A novel 3D-printed filter with integrated deflectors is proposed to enhance the state of metal liquid outflow. The rectification effect of filters with varying structural sizes was investigated through physical simulations. It was found that filters with smaller structural sizes allow the outflowing liquid to interact more readily under disturbance, promoting fluid convergence, but at the cost of reduced flow rates. With 3D printing, deflectors were integrated into a larger structural-size filter to guide fluid convergence, significantly enhancing the rectification effect and flow stability without reducing the flow rate. The filters proposed in this work allow for the decoupling of rectification and filtration functions, providing greater design flexibility for improving filter strength, filtration efficiency, and other critical performance attributes. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Electric rectifiers

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Boosting the electrochemical performance and reliability of conducting polyme microelectrode via intermediate graphene for on-chip asymmetric micro-supercapacitor

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Journal of Energy Chemistry 2020年第10期29卷 224-232页

作者： Muhammad Tahir Liang He Wei Yang Xufeng Hong Waqas Ali Haider Hui Tang Zhe Zhu Kwadwo Asare Owusu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

High-performance anode is hurdle for on-chip planar microsupercapacitor(MSC).Polypyrrole(PPy)is a highly attractive pseudocapacitive material,but its low cycling stability,and low adhesion with current collector hinder its *** we propose one-prong generic strategy to boost the cycling stability of *** our strategy,the electrochemical deposition of multilayered reduced graphene oxide(rGO)on micropatterned Au is utilized,and the resultant rGO@Au pattern is then used for growing highly porous PPy nanostructures by facile electrochemical *** fabricated PPy anode on rGO@Au has quasi rectangular cyclic voltammetry curves up to-0.7 V and exceptional cycling stability,retaining82%of capacitance after 10,000 charge/discharge cycles in 2 M KCl *** outstanding reliability of PPy on rGO@Au is due to the flexibility of rGO,accommodating structural pulverization and providing a promising background for the nucleation of highly porous ***,an all-polymer based asymmetric aqueous MSC(AMSC)is constructed with PPy anode and PEDOT cathode,which exhibited excellent electrochemical performance compared with conventional symmetric MSCs based on conducting *** constructed AMSC delivered a maximum areal capacitance of 15.9 m F cm^-2(99.3 F cm^-3),high specific energy and power densities of 4.3μWh cm^-2(27.03 mWh cm^-3)and 0.36 W cm^-2(0.68 W cm^-3)at 1.4 V,*** enhanced electrochemical performances can be illustrated by nucleation mechanism,in which surface topology of r GO generates a promising background for nucleation and electrochemical growth of nanoporous pseudocapacitive conducting polymers with superior interfacial contact and improved surface area.

关键词： Electrochemical polymerization Nucleation Asymmetric microsupercapacitors

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Two-dimensional gersiloxenes with tunable band gap as new photocatalysts

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Rare Metals 2020年第6期39卷 610-612页

作者： Shao-Wen Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Designing highly efficient and stable photocatalysts is of vital importance for solar-to-fuel conversion,as a potential strategy to address the concerns of global energy crisis and environmental *** development of novel photocatalytic materials is desirable to overcome those shortcomings of traditional semiconductor photocatalysts.

关键词： catalysts overcome shortcomings

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Defect Engineering on Carbon‑Based Catalysts for Electrocatalytic CO2 Reduction

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Nano-Micro Letters 2021年第1期13卷 56-78页

作者： Dongping Xue Huicong Xia Wenfu Yan Jianan Zhang Shichun Mu College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001People’s Republic of China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry and College of ChemistryJilin University2699 Qianjin StreetChangchun 130012People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China

Electrocatalytic carbon dioxide(CO2)reduction(ECR)has become one of the main methods to close the broken carbon cycle and temporarily store renewable energy,but there are still some problems such as poor stability,low activity,and *** the most promising strategy to improve ECR activity is to develop electrocatalysts with low cost,high activity,and long-term ***,defective carbon-based nanomaterials have attracted extensive attention due to the unbalanced electron distribution and electronic structural distortion caused by the defects on the carbon ***,the present review mainly summarizes the latest research progress of the construction of the diverse types of defects(intrinsic carbon defects,heteroatom doping defects,metal atomic sites,and edges detects)for carbon materials in ECR,and unveil the structure-activity relationship and its catalytic *** current challenges and opportunities faced by high-performance carbon materials in ECR are discussed,as well as possible future *** can be believed that this review can provide some inspiration for the future of development of high-performance ECR catalysts.

关键词： Electrocatalytic CO2 reduction Carbon-based nanomaterials Intrinsic defects Heteroatom doping defects Metal atomic sites

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Microstrip Antenna Arrays Based on Two-dimensional Titanium Carbide (MXene) Films 15

Microstrip Antenna Arrays Based on Two-dimensional Titanium ...

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15th International Conference on Microwave and Millimeter Wave technology, ICMMT 2023

作者： Guo, Jiannan Zu, Hao-Ran Yang, Runjie Liu, Xueyu Li, Bao-Wen Song, Rongguo He, Daping Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan430070 China Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesisand Processing Wuhan430070 China

ISBN: (纸本)9798350338874

In this work, a microstrip antenna array based on a two-dimensional titanium carbide (MXene) film with an operating frequency of 3.5 GHz is proposed for the first time. MXene film has a conductivity of 5∗105 S/m and a thickness of 15 μm, which has good ductility and flexibility. The radiating units are arranged by 2 units, and the microstrip lines with parallel feeding between the array elements directly feed the antenna. The return loss of the proposed 2∗2 MXene antenna array is -24.3 dB, and the impedance bandwidth of a -10 dB is 11.1% (3.21 GHz-3.66 GHz), and a maximum gain of 5.73 dBi. The results show that the MXene antenna array has excellent performance and verifies the feasibility of preparing high-performance antennas, which have significant potential for future 5G mobile communication. It has crucial application potential in future 5G mobile communication. © 2023 IEEE.

关键词： 5G mobile communication systems

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Three-dimensional-printed Ni-based scaffold design accelerates bubble escape for ampere-level alkaline hydrogen evolution reaction

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Interdisciplinary materials 2024年第4期3卷 595-606页

作者： Jingxuan Chen Gangwen Fu Yu Tian Xingchuan Li Mengqi Luo Xiaoyu Wei Ting Zhang Tian Gao Cheng Chen Somboon Chaemchuen Xi Xu Xing Sun Tongle Bu Francis Verpoort John Wang Zongkui Kou State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina Marine New Materials and Equipment Technology Center Sanya Science and Education Innovation Park of Wuhan University of TechnologySanyaChina Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi'anChina Key laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingboChina School of Astronautics Northwestern Polytechnical UniversityXi'anChina Department of Materials Science and Engineering College of Design and EngineeringNational University of SingaporeSingaporeSingapore National University of Singapore(Chongqing)Research Institute Chongqing Liang Jiang New AreaChongqingChina

Alkaline hydrogen evolution reaction(HER)for scalable hydrogen production largely hinges on addressing the sluggish bubble-involved kinetics on the traditional Ni-based electrode,especially for ampere-level current densities and ***,3D-printed Ni-based sulfide(3DPNS)electrodes with varying scaffolds are designed and *** situ observations at microscopic levels demonstrate that the bubble escape velocity increases with the number of hole sides(HS)in the ***,we conduct multiphysics field simulations to illustrate that as the hole shapes transition from square,pentagon,and hexagon to circle,where a noticeable reduction in the bubble-attached HS length and the pressure balance time around the bubbles results in a decrease in bubble size and an acceleration in the rate of bubble ***,the 3DPNS electrode with circular hole configura-tions exhibits the most favorable HER performance with an overpotential of 297 mV at the current density of up to 1000 mA cm^(-2) for 120 *** present study highlights a scalable and effective electrode scaffold design that promotes low-cost and low-energy green hydrogen production through the ampere-level alkaline HER.

关键词： 3D printing alkaline hydrogen evolution reaction ampere-level current densities bubble escape hole sides

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High-dielectric-constant nanograin BaTiO_(3)-based ceramics for ultra-thin layer multilayer ceramic capacitors via grain grading engineering

Advanced Powder Materials

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advanced Powder materials 2022年第3期1卷 63-69页

作者： Chaoqiong Zhu Ziming Cai Xiuhua Cao Zhenxiao Fu Longtu Li Xiaohui Wang State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Advanced Materials and Electronic Components Guangdong Fenghua Advanced Technology Holding Co.LtdZhaoqingGuangdong 526000China

Four BT-based ceramic samples were prepared using a grain grading *** bigger-grained(~100 nm)and smaller-grained(~70 nm)BaTiO_(3)(BT)powders were *** smaller-grained BT powder controlled the average grain size and guaranteed the reliability,while the bigger-grained powder enhanced the dielectric *** percentages of bigger-grained BT powder were introduced to balance the average grain size and the dielectric *** the proportion of bigger grains increased,the dielectric constant(εr)improved *** room-temperatureεr of 25%bigger-grain mixed BT(2623)was~50%higher than that of the sample with a similar average grain size without grain *** ceramic mixed with 15%bigger-grained BT showed comprehensive dielectric performance,which met the EIA X5R standard and provided a considerableεr of 1841 along with a low dielectric loss of 0.78%.Notably,the average grain size was 90 nm,which favors the applications in ultra-thin multilayer ceramic capacitors.

关键词： Grain grading engineering Nanograin BaTiO_(3) Dielectric constant Reliability Multilayer ceramic capacitors

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Molecular origin for toughness of hydrogel artificial spider silk for surgical sutures

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Science China Chemistry 2025年

作者： Jiatian Li Abdul Qadeer Khan Weiqiang Zhao Zhipeng Lai Qiankun Bao Muhammad Rafique Fazhi Ye Jie Bai Qiang Zhou Liqiang Mai Zongqian Wang Enzhao Liu Xiang Zhou Zunfeng Liu Chemical Engineering College Inner Mongolia University of Technology Tianjin Key Laboratory of Ionic-Molecular Function of Cardiovascular Disease Department of Cardiology Tianjin Institute of CardiologyThe Second Hospital of Tianjin Medical University State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer Materials Tianjin Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University School of Biomedical Engineering and Med-X Research Institute Shanghai Jiao Tong University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Tianjin First Central Hospital School of Textile and Garment Anhui Polytechnic University Department of Science School of Traditional Chinese Pharmacy China Pharmaceutical University

The pursuit of biomimetic fibers with simultaneous high toughness and strength persists, despite their inherent ***, for artificial spider silk based on gel fiber, it is still unclear for the molecular chain attributes related to the improvement of the strength and toughness. Here, a hydrogel fiber was prepared by mimicking the molecular structure of natural spider silk, and we delved into the molecular chain structure characteristics related to the strength, toughness and damping capacity of gel fiber, such as crosslinking density, molecular chain orientation and hydrogen bond interaction. The results indicate that a certain increase in crosslinking density and molecular chain orientation contributes to the enhancement of tensile strength, while the toughness and damping remain essentially unaltered. The thermal dissociation of hydrogen bond could enhance the toughness in a specific range, while the humidity destruction of hydrogen bond would reduce the *** well-regulation control of the weight ratio of polyacrylamide （PAM） to poly（acrylic acid）(PAA), the PAM@PAA gel fibers could reach maximum breaking strength of 1.02 GPa, maximum toughness of 149 MJ m-3, and damping capacity of 95%.PAM@PAA gel fiber has demonstrated excellent wound healing performance and biocompatibility in vivo evaluation as a surgical suture, which indicates its potential in biomedical applications.

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Perfluorosulfonic acid proton exchange membrane with double proton site side chain for high-performance fuel cells at low humidity

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Journal of materials Science & technology 2023年第35期166卷 155-163页

作者： Hongyun Tan Shengqiu Zhao S.Eltahir Ali Shuhong Zheng Abdullah K.Alanazi Rui Wang Haining Zhang Hala M.Abo-Dief Ben Bin Xu Hassan Algadi Handong Li Priyanka Wasnik Zhanhu Guo Haolin Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Science and Technology University College-RanyahTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China Integrated Composites Laboratory(ICL) Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran11001Saudi Arabia

Structural optimization of ionomers is an effective strategy for achieving high-performance proton ex-change membranes(PEMs)under low relative humidity(RH)*** this study,sulfonimide group and trifluoromethanesulfonate acid(TFSA)ionic liquids were introduced to the perfluorosulfonic acid(PFSA)side chain,resulting in polymer membranes with varying chain lengths(i.e.,PFC_(2)-TF-SI,PFC_(4)-TF-SI,and PFC_(5)-TF-SI).This dual proton-conducting structure extended the length of the hydrophilic side chain and enhanced the hydrophobic-hydrophilic phase separation,aiding in the formation of proton transport ***,the proton conductivity of PFC_(5)-TF-SI and PFC_(2)-TF-SI membranes reached 7.1 and 10.6 mS/cm at 30%RH and 80℃,respectively,which were approximately 29.1%and 92.7%higher than that of the pristine PFC_(5)-SA membrane(5.5 mS/cm).Furthermore,the maximum power density of the PFC_(5)-TF-SI and PFC_(2)-TF-SI membranes from the built single fuel cell achieved 649 and 763 mW/cm^(2) at 30%RH and 80℃,respectively,which were higher than that of the pristine PFC_(5)-SA membrane(567 mW/cm^(2))by about 14.5%and 34.6%,***,this study provides a strategy for PEM design under low RH conditions.

关键词： Proton exchange membrane Structural design Dual proton conduction Hydrophilic channel Proton conductivity Fuel cells

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