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Failure Behavior and Mechanism of Vat Photopolymerization Additively Manufactured Al_(2)O_(3) Ceramic Lattice Structures

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Additive Manufacturing Frontiers 2024年第4期3卷 166-177页

作者： Keqiang Zhang Xueqin Zhang Qiaoyu Meng Bin Zhang Zhaoliang Qu Rujie He State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China School of Naval Architecture Ocean and Energy Power EngineeringWuhan University of TechnologyWuhan430070China

Vat photopolymerization additive manufacturing produces lightweight load-bearing ceramic lattice structures that have flexibility,time-efficiency,and high precision,compared to conventional ***,understanding the compression behavior and failure mechanism of such structures under loading remains a *** this study,considering the correlation between the strut angle and bearing capacity,body-centered tetragonal(BCT)lattice structures with varying angles are designed based on a body-centered cubic(BCC)*** Al_(2)O_(3) ceramic lattice structures with varying angles are fabricated by vat *** mechanical properties,deformation process,and failure mechanism of the Al_(2)O_(3) ceramic lattice structures are characterized through a combination of ex-and in-situ X-ray computed tomography(X-CT)compression testing and analyzed using a finite element method(FEM)at macro-and *** results demonstrate that as the angle increases,the stress concentration gradually expands from the node to the strut,resulting in an increased loadbearing ***,the failure mode of the Al_(2)O_(3) ceramic lattice structures is identified as diagonal slip shear *** findings provide a greater understanding of ceramic lattice structure failures and design optimization approaches.

关键词： Ceramic lattice structure Vat photopolymerization additive manufacturing Ex-and in-situ X-ray computed tomography(X-CT) Compression behavior Failure mechanism

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Nitrogen-doped lignin based carbon microspheres as anode material for high performance sodium ion batteries

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Green Energy & Environment 2021年第2期6卷 220-228页

作者： Linlin Fan Zhiqiang Shi Qingjuan Ren Lei Yan Fuming Zhang Liping Fan Tianjin Key Laboratory of Advanced Fibers and Energy Storuage Schoo of Materials Science and EngineeringTiangong UniversityTianjin300387China Schod of Chemical Engineering and Technology Tianjin University Tianjin300072China

Nitrogen-doped lignin-based carbon microspheres are synthesized using 3-aminophenol as a nitrogen source by the hydrothermal *** structural change and the effect on the electrochemical properties are systematically investigated. Nitrogen-doped lignin-based carbon microspheres represent well-developed spherical morphology with many active sites, ultramicroporous(< 0.7 nm) structure, and large interlayer spacing. Consistent with the obtained physical structures and properties, the nitrogen-doped carbon microspheres exhibit fast sodium ion adsorption/intercalation kinetic process and excellent electrochemical performance. For example, a reversible specific capacity of 374 m Ah g^(-1) at 25 m A g^(-1) with high initial coulombic efficiency of 85% and high capacitance retention of 90% after 300 cycles at 100 m A g^(-1) and stable charge/discharge behavior at different current density is obtained. The additional defects and abundant ultramicroporous structure can enhance sloping capacity, and large interlayer spacing is considered to be the reason for improving plateau capacity.

关键词： Sodium ion batteries Anode Carbon microspheres Hydrothermal method Lignin

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The Substitutability and Plasticization Mechanism of Environmentally Friendly Plasticizers: Experiments and Md Simulations

SSRN

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SSRN 2024年

作者： Gao, Li Yuan, Rui Tu, Chang Tan, Rui Xu, Shiai Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China Qinghai Province Key Laboratory of Salt Lake Materials Chemical Engineering Qinghai University Xining810016 China

There has been a growing interest in the use of natural resource-based plasticizers instead of phthalate plasticizers, such as citric acid, fatty acid ester, plant oils, etc. However, the advantages of these plasticizers and the differences in their plasticizing mechanisms compared to phthalate plasticizers have rarely been investigated. Epoxidized soybean oil (ESO), triphenyl phosphate (TCP) and acetyl tributyl citrate (ATBC) were selected for a controlled study with dictyl phthalate (DOP), using a combination of characterization techniques and molecular dynamics (MD) simulations. The results show that the elongation at break is 723.0% (ATBC/PVC), 705.7% (ESO/PVC), 569.7% (TCP/PVC) and 665.7% (DOP/PVC) when the content of plasticizer is 40 wt%, indicating that the elongation at break of ATBC/PVC and ESO/PVC is shown to be better than that of DOP/PVC. The migration rates are MESO/PVC > MDOP/PVC > MTCP/PVC > MATBC/PVC in deionized water and MTCP/PVC > MATBC/PVC > MDOP/PVC > MESO/PVC in 50% (v/v) ethanol. The MD simulation results corroborate these observations and further reveal its microscopic mechanism. Our study contributes to the understanding of the properties and microscopic plasticizing mechanisms of environmentally friendly plasticizers and provides theoretical support for their wider application. © 2024, The Authors. All rights reserved.

关键词： Polyvinyl chlorides

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Coupling highly reactive RuP2 with amorphous WP for boosting alkaline hydrogen evolution

SSRN

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SSRN 2024年

作者： Wang, Jing Zhou, Yingshuang Ji, Xing Wang, Zhenzhen Fang, Zefeng Lu, Bin Guo, Junjie Wei, Zhongzhe Institute of Advanced Magnetic Materials College of Materials & Environmental Engineering Hangzhou Dianzi University Hangzhou310018 China Key laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan030024 China Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology Hangzhou310032 China

Electrochemical water splitting stands out as an environmentally benign approach for generating green H2 through the harnessing of intermittent energy derived from renewable sources. However, the slow water dissociation kinetics hinders the commercialization for water-alkali electrolyzer. In this study, we synthesize a novel porous nanocomposite (RuP2/WP/PNC3-A) combined with RuP2 and amorphous WP by a facile and eco-friendly strategy. Detailed research results demonstrate that biomass-derived phytic acid not only promotes the formation of active metal phosphides, but also serves as a pore-forming agent to assist in the constructing a hierarchical porous structure, significantly enhancing the mass and electron transfer capability. Particularly noteworthy is that WP prevents the aggregation of RuP2. During the post-treatment process more protected RuP2 components are released and meanwhile leads to the conversion of WP from crystalline to amorphous. Benefitting from the applicable H adsorption ability of RuP2 and the enhanced H2O adsorption, dissociation capacity by amorphous WP, RuP2/WP/PNC3-A exhibits astonishing hydrogen evolution reaction (HER) performance, requiring an exceedingly low overpotential (only 24 mV) under 10 mA cm-2, featuring small Tafel slope (64.6 mV dec-1), and demonstrating excellent durability. © 2024, The Authors. All rights reserved.

关键词： Phosphorus compounds

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Strengthening of Ultrafine Lamellar-Structured Martensite Steel via Tempering-Induced Nanoprecipitation

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1812-1824页

作者： Xinbo Ji Liming Fu Han Zheng Jian Wang Hengchang Lu Wei Wang Mao Wen Han Dong Aidang Shan School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of High Temperature Materials and Precision Forming Shanghai JiaoTongUniversityShanghai 200240China Zhejiang Institute of Advanced Materials Shanghai UniversityJiaxing 314113China Baowu Steel Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai 201900China

An ultrafine lamellar-structured martensite steel fabricated by heavy warm rolling(HWR)has shown an excellent combination of strength and *** appending tempering at 400℃to HWR,we show that the comprehensive mechanical property of a lamellar-structured low-carbon martensite steel can be further improved to reach a yield strength of~1.8 GPa,an ultimate tensile strength of~2.0 GPa and a total elongation of~9.3%.This is achieved by tempering the HWR steel from 300 to 750℃,and the optimum tempering temperature is thus *** find that the tempered ultrafine lamellar martensite contains high-density nanoprecipitates dispersed within the aligned martensite laths with reduced crystallographic *** ultrahigh strength of the steel is rationalized as mainly the result of grain boundary strengthening and precipitation strengthening,which contribute to yield stress by 610 MPa and 440 MPa,*** good ductility is believed to be closely related to the capacity of the tempered grains to accommodate dense dislocations upon plastic *** present thermomechanical processing provides a feasible routine for producing steels with ultrahigh-strength and good-ductility.

关键词： Low-carbon steel Heavy warm-rolling Ultrafi ne lamellar-structured martensite Precipitation strengthening Mechanical property

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Status and challenges facing representative anode materials for rechargeable lithium batteries

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Journal of Energy Chemistry 2022年第3期31卷 260-294,I0008页

作者： Liqiang Zhang Chenxi Zhu Sicheng Yu Daohan Ge Haoshen Zhou Institute of Intelligent Flexible Mechatronics School of Mechanical EngineeringJiangsu UniversityZhenjiang 212013JiangsuChina Center of Energy Storage Materials&Technology College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNational Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093JiangsuChina Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8568Japan

Rechargeable lithium batteries have been widely regarded as a revolutionary technology to store renewable energy sources and extensively researched in the recent several *** an indispensable part of lithium batteries,the evolution of anode materials has significantly promoted the development of lithium ***,since conventional lithium batteries with graphite anodes cannot meet the ever-increasing demands in different application scenarios(such as electric vehicles and large-scale power supplies)which require high energy/power density and long cycle life,various improvement strategies and alternative anode materials have been exploited for better electrochemical *** this review,we detailedly introduced the characteristics and challenges of four representative anode materials for rechargeable lithium batteries,including graphite,Li_(4)Ti_(5)O_(12),silicon,and lithium *** some of the latest advances are summarized,which mainly contain the modification strategies of anode materials and partially involve the optimization of electrode/electrolyte ***,we make the conclusive comments and perspectives,and draw a development timeline on the four anode *** review aims to offer a good primer for newcomers in the lithium battery field and benefit the structure and material design of anodes for advanced rechargeable lithium batteries in the future.

关键词： Lithium batteries Anode Graphite Li_(4)Ti_(5)O_(12) Silicon Silicon composite anode Lithium metal

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Synthesis and Reaction Mechanism of High Injected Electron Concentration and Low Work Function [Ca24al28o64]4+:(4e-) by Sol-Gel Method Combined with Spark Plasma Sintering

SSRN

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SSRN 2024年

作者： Wang, Shouyong Han, Shangru Zhang, Xin Liu, Nan Luo, Zhuang Rong, Qinglin Yan, Long Lu, Qingmei School of Materials Science and Engineering Beijing University of Technology Key Laboratory of Advanced Functional Materials Ministry of Education Beijing100124 China

The high injected electron concentration and low work function C12A7:e- was successfully prepared by the sol-gel method combined with spark plasma sintering(SPS) using calcium nitrate, aluminum nitrate, citric acid, and ethylene glycol as raw materials. By analyzing the morphology of carbon and its role in the reactive synthesis, we reveal the reaction synthesis mechanism of C12A7:e- under the SPS. The analysis shows that C12A7:e- started to be generated at 800 °C. During the SPS reaction sintering process, carbon atoms from citric acid and ethylene glycol were excited by a pulsed current at high temperature, forming the carbon ions C22- and C (gas). Both act as reducing agents and react with the free oxygen ions O2- in the C12A7 cage cavity to form gaseous CO or CO2, enabling electrons to be injected into the cage cavity, thus generating C12A7:e-. Meanwhile, the graphene oxide (GO) formed on the surface of C12A7: e- grain is produced by the precursor of sol-gel synthesis in the high temperature oxidation environment, which will be conducive to improving the stability of C12A7: e- in air and high temperature oxidation resistance. © 2024, The Authors. All rights reserved.

关键词： Graphene

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High Chern number quantum anomalous Hall effect tunable by stacking order in van der Waals topological insulators

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Physical Review B 2022年第15期105卷 155122-155122页

作者： Wenxuan Zhu Cheng Song Hua Bai Liyang Liao Feng Pan Key Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing 100084 China

The discovery of van der Waals (vdW) MnBi2Te4 provides a platform for investigating the quantum anomalous Hall effect (QAHE), which is a candidate for quantum computation without dissipation. However, because of the topological requirement, the High Chern number QAHE with extended dissipation-free channels is hard to achieve in atomically thin samples, which can take full advantage of two-dimensional (2D) materials. In this work, by first-principles calculations, the variable stacking order (inherent to vdW materials) was proposed as a means of regulating the Chern number of the QAHE in MnBi2Te4 (MBT). The interlayer stacking order in the 2D limit dominates the orbital hybridization, resulting in a tunable topological property. Furthermore, the High Chern number QAHE with C=N was achieved in ultrathin MBT (2N septuple layers) with alternate stacking orders, which have different topological states. This scenario was extended to the vdW heterostructure of MBT-family materials for achieving a stable, zero-field, High Chern number QAHE. Our work reveals stacking tunable topological properties in vdW magnetic topological insulators and provides an effective means of regulating the QAHE.

关键词： Quantum transport Topological insulators Topological phase transition

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Effect of Powder Production Methods on Microstructure and Mechanical Properties of Hot Isostatically Pressed TA15 Alloy

Effect of Powder Production Methods on Microstructure and Me...

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Chinese materials Conference 2024, CMC 2024

作者： Ni, Ruifeng Zhang, Pengjie Che, Lida Lv, Zhoujin Chen, Shuo Zhang, Lin Li, Xiangyang Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China CISRI HIPEX Technology Co. Ltd. Beijing China National Key Laboratory of Metallurgical Intelligent Manufacturing System China Iron & Steel Research Institute Group Co. Ltd. Beijing100081 China

TA15 alloy billets were prepared by powder metallurgy-hot isostatic pressing, using 920°C, 120MPa, and a 3h holding time. Pre-alloyed powders were prepared using a plasma rotating electrode process, gas atomization, and hydrogen dehydrogenation. The particle morphology, chemical composition, particle size distribution, and microstructure of the different powders were first characterized. Then, the differences in microstructure and mechanical properties of the three alloy billets were analyzed. The results show HIP-P (tensile strength 956 MPa, elongation 16.5%) and HIP-G (tensile strength 912 MPa, elongation 16.83%) have an excellent strength-toughness combination. Although HIP-H has the highest tensile strength of 1066MPa, the elongation is only 1.3%, presenting the characteristics of high strength and low toughness. Its fracture morphology is a river pattern, a typical brittle fracture along the crystal. The 'elemental segregation' within the HDH powder causes the brittle fracture. This segregation leads to stress concentration during deformation, facilitating the initial propagation of cracks from the segregated regions. The high oxygen content (2200 ppm) in the HDH powder also contributes to the embrittlement observed in HIP-H. This study provides crucial insights for selecting raw powder materials and optimizing process parameters in producing HIP TA15 titanium alloy. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Tensile strength

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Ternary NiCoTi-layered double hydroxide nanosheets as a pH-responsive nanoagent for photodynamic/chemodynamic synergistic therapy

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Fundamental Research 2024年第4期4卷 926-933页

作者： Tingting Hu Zhan Zhou Jiajia Zha Gareth RWilliams Zhikang Wu Wei Zhao Weicheng Shen Hai Li Xisheng Weng Ruizheng Liang Chaoliang Tan State Key Laboratory of Chemical Resource Engineering Bejing Advanced Innovation Center for Soft Matter Science and EngineeringBejing University of Chemical TechnologyBeijing100029China College of Chemistry and Chemical Engineering Henan Key Laboratory of Function-Oriented Porous MaterialsLuoyang Normal UniversityLuoyang 471934China Department of Electrical Engineering City University of Hong KongHong Kong SAR 999077China UCL School of Pharmacy University College LondonLondon WCIN 1AXUnited Kingdom Institute of Advanced Materials(IAM)and Key Laboratory of Flexible Electronics(KLoFE) Nanjing Tech University(NanjingTech)Nanjing 211816China Department of Orthopedic Surgery State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100730China Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong Kong SAR 999077China Shenzhen Research Institute City University of Hong KongShenzhen 518057China

Combining photodynamic therapy(PDT)with chemodynamic therapy(CDT)has been proven to be a promising strategy to improve the treatment efficiency of cancer,because of the synergistic therapeutic effect arising between the two ***,we report an inorganic nanoagent based on ternary NiCoTi-layered double hydroxide(NiCoTi-LDH)nanosheets to realize highly efficient photodynamic/chemodynamic synergistic *** NiCoTi-LDH nanosheets exhibit oxygen vacancy-promoted electron-hole separation and photogenerated holeinduced O_(2)-independent reactive oxygen species(ROS)generation under acidic circumstances,realizing in situ pH-responsive ***,due to the effective conversion between Co^(3+)and Co^(2+)caused by photogenerated electrons,the NiCoTi-LDH nanosheets catalyze the release of hydroxyl radicals(-OH)from H_(2)O_(2)through Fenton reactions,resulting in *** irradiation enhances the catalyzed ability of the NiCoTi-LDH nanosheets to promote the ROS generation,resulting in a better performance than TiO_(2)nanoparticles at pH *** vitro and in vivo experimental results show conclusively that NiCoTi-LDH nanosheets plus irradiation lead to efficient cell apoptosis and significant inhibition of tumor *** study reports a new pH-responsive inorganic nanoagent with oxygen vacancy-promoted photodynamic/chemodynamic synergistic performance,offering a potentially appealing clinical strategy for selective tumor elimination.

关键词： Layereddouble hydroxides Photodynamic therapy pH-responsive Chemodynamic therapy Oxygen vacancy

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