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Preparation and characterization of rare earth composite catalytic materials for conversion of exhaust from natural gas automobiles

The Sixth China-Japan-US Joint Conference on composite materials

作者： Yaqin Fu, Qing-Qing Ni, Wenxing Chen, Yuefei Yao, Guanfen Liu(ZheJiang Institute of Science and Technology, Hangzhou, 310033, China Kyoto Institute of Technology, kyoto 606-8585,Japan)

＜正＞Although the comparison between experimental findings and analytical predictions of sound insulation for single panel and composite materials sandwich plates have been conducted by several researchers, this is far insufficiency to clarify the complicated acoustic propagation mechanism of composite materials due to reflection, transmission, dispersion and other acoustic behavior. In this paper, to improve the acoustic insulation of composite materials, the simulations of acoustic propagation was conducted and acoustic transmission loss characteristics of thin panels are presented. The complicated acoustic propagation process resulted from transmission and refraction was visualized, and the influence of dif-ferent fillers was discussed.

关键词： Simulation Acoustic insulation Transmission loss composite materials

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Preparation and characterization of rare earth composite cat...

An origami shield with supporting frame structures optimized by a feature-driven topology optimization method

2012 China Functional materials Technology and Industry Forum

作者： YanKun Yuan Gang Xue Saifei Wang Xueliang Zhang Institute of Power Source and Ecomaterials Science Hebei University of Technology

A series of rare-earth composite catalytic material LZ1,LZ2 and LZ3 that contains mixture of LaSrCoMnO and CeZrO in different proportion(3:7,5:5,7:3)were prepared by a sol-gel method and characterized by X-ray diffraction(XRD),specific surface analysis(BET),Transmission electron microscopy(TEM) and temperature programmed reduction (TPR).The results indicated that in LZ3,a perfect crystal structure of perovskite and a cubic fluorite structure were *** LZ3 presented scattered spherical granules with a particle size of about 30 nm and a specific surface area of 20.9870 m/*** temperature of reduction peak was lowest(490℃) and peak area was larger,so it had the best catalytic activity for methane combustion.

关键词： composite materials rare earth catalysis natural gas

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Defence Technology（防务技术） 2024年第1期31卷 447-456页

作者： Dongsheng Jia Pengcheng Feng Liangdi Wang Longcan Chen Jun Wang Jihong Zhu Yingjie Xu Weihong Zhang State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi'an710072China

In this paper,the design,manufacture and testing of an origami protective shield with a supporting frame structure are *** consists of an origami shield surface and a deployable supporting frame structure that needs to be portable and sufficiently ***,for the design of the shield surface,a threestage origami crease pattern is developed to reduce the shield size in the folded *** shield surface consists of several stiff modular panels and layered with flexible *** modular panels are made of a multi-layer composite where a ceramic layer is made of small pieces to improve durability as those small pieces enable restriction of crack ***,the supporting frame structure is designed as a chain-of-bars structure in order to fold into a highly compact state as a bundle of bars and deploy in ***,a feature-driven topology structural optimization method preserving component sequence is developed where the inter-dependence of sub-structures is taken into account.A bar with semi-circular ends is used as a basic design *** positions of the bar’s end points are treated as design variables and the width of the bars is kept ***,a constraint on the total length of the chain of bars is ***,the modular panels made of multi-layer composite and the full-scale prototype of the origami shield are fabricated and tested to verify the bullet-proof performance.

关键词： Origami Deployable structure Structure design Shield composite materials

In situ anchoring in carbon matrix of Bi2O2CO3 as a high-performance anode material for Li-ion batteries

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Rare Metals 2024年第08期43卷 3634-3646页

作者： Pu-Qiang He Jun Guo Hui Huang Zhong-Cheng Guo Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology Research Center of Metallurgical Electrode materials Engineering Technology Kunming Hendera Science and Technology Co. Ltd.

Bismuth-based anode materials have been regarded as promising Li-ion batteries due to their high theoretical ***,their low conductivity and associated volume expansion inhabited their *** this work,Bi2O2CO3@C composites were successfully synthesized by in situ anchoring of flower-like Bi2O2CO3nanosheets on a carbon-based substrate via *** unique composited structure of Bi2O2-CO3@C leads to a stable specific capacity of 547 mAh·g-1after 100 cycles at a current density of 0.1 A·***,it demonstrates excellent rate capability with a specific capacity of 210 mAh·g-1at 5 A·*** 550 cycles at a current density of 0.5 A·g-1,a high reversible capacity of nearly 400 mAh·g-1was ***,in situ X-ray diffraction measurements clearly demonstrate the conversion between Bi and Li3Bi during alloying/dealloying,confirming the good electrochemical reversibility of the materials for Li *** reaction kinetics of Bi2O2CO3@C were further investigated using galvanostatic intermittent titration ***,Bi2O2-CO3@C exhibited excellent long-term stability,maintaining its high reversible capacity for over 200 cycles at a current density of 0.5 A·g-1in a full cell configuration using Li1.20Mn0.54Ni0.13Co0.13O2as the cathode *** result further underscores its promising potential for lithium-ion *** work may provide inspiration for the design of alloy-type negative electrode materials for high-performance rechargeable batteries.

关键词： Bi 2 O 2 CO 3 composite materials Anode materials Full batteries

Research status and perspectives of MXene-based materials for aqueous zinc-ion batteries

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Rare Metals 2024年第5期43卷 1867-1885页

作者： Xiao-Yu Wang Qi-Hang Yang Xin-Yan Meng Meng-Meng Zhen Zhen-Zhong Hu Bo-Xiong Shen School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300071China

Aqueous zinc-ion batteries(AZIBs)as green battery systems have attracted widespread attention in large-scale electrochemical energy storage devices,owing to their high safety,abundant Zn materials,high theoretica specific capacity and low redox *** there are some thorny issues in AZIBs that hinder their practical application,such as low intrinsic electron conductivity,slow ion migration kinetics,zinc dendrites and side ***-based materials with superior conductivity,large polar surface and abundant active sites can simultaneously serve as cathode materials,electrolyte additive and protection layer of anode to regulate redox reactions of *** various materials have been used to improve electrochemical performances of AZIBs there is a lack of in-depth discussion on the regulation mechanism of MXene-based materials for *** this review,we elaborate the research progress of MXenebased materials in AZIBs,including their application in cathode materials and inhibition of zinc *** the future prospects and development directions of MXenebased materials that may improve performance of AZIBs are prospected.

关键词： MXene Aqueous zinc-ion batteries composite materials Zinc dendrites

单向复合材料均质化弹性性能预测的集成学习模型:基于SHAP方法的可解释性分析

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Acta Mechanica Sinica 2024年第3期40卷 109-122页

作者：王文照赵云妹李岩 School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

本研究提出了一种可解释的集成学习(EML)数据驱动方法,用于快速预测单向纤维增强复合材料的均质化弹性性能.我们选择了三种机器学习模型――随机森林(RF)、极端梯度提升机(XGBoost)和轻量梯度提升机(LGBM)来构建EML模型.基于实验并建立... 详细信息

本研究提出了一种可解释的集成学习(EML)数据驱动方法,用于快速预测单向纤维增强复合材料的均质化弹性性能.我们选择了三种机器学习模型――随机森林(RF)、极端梯度提升机(XGBoost)和轻量梯度提升机(LGBM)来构建EML模型.基于实验并建立微观纤维分布的概率统计模型,结合有限元仿真,建立了反映纤维随机分布特征的代表性体元(RVE)模型,并创建相关数据集.通过准确性、效率、可解释性和泛化性等指标对EML模型的性能进行了全面评估,研究结果表明:(1)EML模型有效提升了基机器学习模型的预测精度(R2=0.962,MS E=5.41);(2)我们使用基于合作博弈理论的SHAP可解释性方法对预测结果进行了分析,其中,全局解释发现纤维的体积含量是影响复合材料均质化弹性性能的决定性变量,而局部解释阐明了输入特征对预测结果的关键影响机制;(3)EML模型在实验数据上表现出良好的泛化能力,计算结果与实验数据吻合度高,实现了复合材料均质化弹性性能的高效精准预测.

关键词： composite materials Homogenization Ensemble learning Interpretation Model generalization

A review of classical hydrogen isotopes storage materials

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materials Reports(Energy) 2024年第1期4卷 23-42页

作者： Yang Liu Zhiyi Yang Panpan Zhou Xuezhang Xiao Jiacheng Qi Jiapeng Bi Xu Huang Huaqin Kou Lixin Chen State Key Laboratory of Silicon and Advanced Semiconductor materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027ZhejiangPR China Key Laboratory of Advanced materials and Applications for Batteries of Zhejiang Province Hangzhou310013ZhejiangPR China Institute of materials China Academy of Engineering PhysicsMianyang621907SichuanPR China

Hydrogen storage alloys(HSAs)are attracting widespread interest in the nuclear industry because of the generation of stable metal hydrides after tritium absorption,thus effectively preventing the leakage of radioactive *** used HSAs in the hydrogen isotopes field are Zr2M(M=Co,Ni,Fe)alloys,metallic Pd,depleted U,and ZrCo ***,Zr2M(M=Co,Ni,Fe)alloys are considered promising tritium-getter materials,and metallic Pd is utilized to separate and purify hydrogen ***,depleted U and ZrCo alloy are well suited for storing and delivering hydrogen ***,all the aforementioned HSAs need to modulate their hydrogen storage properties for complex operating *** this review,we present a comprehensive overview of the reported modification methods applied to the above *** is an effective amelioration method that mainly modulates the properties of HSAs by altering their local geometrical/electronic ***,microstructural modifications such as nano-sizing and nanopores have been used to increase the specific surface area and active sites of metallic Pd and ZrCo alloys for enhancing de-/hydrogenation *** combination of metallic Pd with support materials can significantly reduce the cost and enhance the pulverization ***,the poisoning resistance of ZrCo alloy is improved by constructing active surfaces with selective ***,the review is constructive for better understanding the properties and mechanisms of hydrogen isotope storage alloys and provides effective guidance for future modification research.

关键词： Hydrogen isotopes storage alloys Alloying Microstructural modification Surface modification composite materials

Structural design and mechanical performance of composite vascular grafts

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Bio-Design and Manufacturing 2022年第4期5卷 757-785页

作者： Abdul Wasy Zia Rong Liu Xinbo Wu School of Fashion and Textiles The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SARChina

This study reviews the state of the art in structural design and the corresponding mechanical behaviours of composite vascular grafts. We critically analyse surface and matrix designs composed of layered, embedded, and hybrid structures along the radial and longitudinal directions;materials and manufacturing techniques, such as tissue engineering and the use of textiles or their combinations;and the corresponding mechanical behaviours of composite vascular grafts in terms of their physical–mechanical properties, especially their stress–strain relationships and elastic recovery. The role of computational studies is discussed with respect to optimizing the geometrics designs and the corresponding mechanical behaviours to satisfy specialized applications, such as those for the aorta and its subparts. Natural and synthetic endothelial materials yield improvements in the mechanical and biological compliance of composite graft surfaces with host arteries. Moreover,the diameter, wall thickness, stiffness, compliance, tensile strength, elasticity, and burst strength of the graft matrix are determined depending on the application and the patient. For composite vascular grafts, hybrid architectures are recommended featuring multiple layers, dimensions, and materials to achieve the desired optimal flexibility and function for complying with user-specific requirements. Rapidly emerging artificial intelligence and big data techniques for diagnostics and the threedimensional(3D) manufacturing of vascular grafts will likely yield highly compliant, subject-specific, long-lasting, and economical vascular grafts in the near-future.

关键词： Vascular grafts Surface design Structural design composite materials Mechanical properties

Deep eutectic solvent inclusions for high-k composite dielectric elastomers

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 996-1002页

作者： Changgeng Zhang Qi Zhang School of Science and Engineering The Chinese University of Hong KongShenzhenShenzhen 518172China

Recent advances in novel electroactive devices have placed new requirements on material ***-performance dielectric elastomers with good mechanical stretchability and high dielectric constant are under high ***,the current strategy for fabricating these materials suffers from high cost or low thermal stability,which greatly hinders large-scale industrial ***,we have successfully developed a novel strategy for improving the dielectric constant of polymeric elastomers via deep eutectic solvent inclusion by taking advantage of the low cost,convenient and environmentally benign synthesis process and high ionic conductivity from deep eutectic *** as-prepared composite elastomers showed good stretchability and a greatly enhanced dielectric constant with a negligible increase in dielectric ***,we have proven the universality of our strategy by using different types of deep eutectic *** is believed that low-cost,easy-synthesis and environmentally friendly deep eutectic solvents including composite elastomers are highly suitable for large-scale industrial production and can greatly broaden the application fields of dielectric elastomers.

关键词： composite materials deep eutectic solvent dielectric elastomer high dielectric constant