检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Zhang, Xuehui Lang, Bo Yu, Wenwen Jia, Lan Zhu, Fengbo Xue, Yanru Wu, Xiaogang Qin, Yixian Phil Chen, Weiyi Wang, Yanqin Zheng, Qiang College of Materials Science & Engineering Taiyuan University of Technology Taiyuan030024 China College of Biomedical Engineering Taiyuan University of Technology Taiyuan030024 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030024 China Dept. of Biomedical Engineering State University of New York at Stony Brook New York11794 United States Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou310027 China

The development of flexible strain sensors with multidimensional sensing and physiotherapy abilities simultaneously is brilliant for the advancement of wearable sensing electronics. Herein, a composite hydrogel with anisotropic electromechanical properties and excellent magnetothermal capabilities was developed based on a magnetic field pre-induction strategy. Specifically, the as-developed two-dimensional Fe3O4@MXene nanohybrids were induced to be orientationally aligned within the polyvinyl alcohol (PVA) network for conductive hydrogels with anisotropic topology structures. Due to the as-optimized composite hydrogel exhibiting different conductivities in parallel and vertical directions, it can be developed into a multidimensional strain sensor, which is suitable for strain sensing in orthogonal directions with distinguishable gauge factors (such as GF = 3.20, while GF⊥ = 1.78 in the tensile strain range of 0 ~ 60%) and relatively fast response time (t = 74.47 ms, t⊥ = 157.63 ms). Furthermore, the composite conductive hydrogels can also be assembled into a 3D distribution array for detecting the magnitude and spatial distribution of stress. In addition, it also exhibits excellent magnetothermal physiotherapy capabilities. In summary, it is a promising candidate for next-generation multidimensional flexible sensors with rehabilitation assistant functions. © 2023, The Authors. All rights reserved.

关键词： Hydrogels

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Effect of heat treatment on the microstructures and hardness of selective laser melted Rene88DT superalloy

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International Journal of Computational materials Science and Surface Engineering 2020年第4期9卷 304-317页

作者： Liu, Jian Yan, Yu Peng, Qin Lei, Yu Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China Key Laboratory for Advanced Materials Processing Ministry of Education University of Science and Technology Beijing Beijing100083 China

Selective laser melted Rene88DT specimens with columnar grains (specimen C) and near-equiaxed grains (specimen E) were fabricated, on which solution-aging and direct aging treatments were applied, respectively. The evolution of microstructures and hardness of both specimens was investigated. Results show that specimen C showed columnar grains with aspect ratio of 3.6 and 5% difference in hardness between vertical and horizontal directions, while specimen E with near-equiaxed grains (aspect ratio of 1-2) was isotropic. The as-deposited alloys consisted of γ-matrix, carbides and Laves phases. After solution-aging treatment, equiaxed grains (56 μm) with annealing twins, blocky μ phases (1 μm) and dispersively distributed γ′ (40 nm) were observed in specimen C. After direct aging treatment, rod-like γ′ phases with 40 nm in length and 15 nm in diameter were precipitated in specimen E. Specimen E showed higher hardness than specimen C because of stronger grain boundary strengthening, substructure strengthening and second-phase strengthening. Copyright © 2020 Inderscience Enterprises Ltd.

关键词： Hardness

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Milling Force Model for Aviation Aluminum Alloy: Academic Insight and Perspective Analysis

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Chinese Journal of Mechanical Engineering 2021年第1期34卷 54-88页

作者： Zhenjing Duan Changhe Li Wenfeng Ding Yanbin Zhang Min Yang Teng Gao Huajun Cao Xuefeng Xu Dazhong Wang Cong Mao Hao Nan Li Gupta Munish Kumar Zafar Said Sujan Debnath Muhammad Jamil Hafiz Muhammad Ali School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory Mechanical Transmiss Chongqing UniversityChongqing 400044China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Educati on&Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310032China School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China College of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114China School of Aerospace University of Nottingham Ningbo ChinaNingbo 315100China Key Lab High Efficiency and Clean Mech Manufacture Shandong UniversityJinan 250100China College of Engineering University of Sharjah27272 SharjahUnited Arab Emirates Mechanical Engineering Department Curtin University98009 MiriMalaysia Mecha nical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia

Aluminum alloy is the main structural material of aircraft,launch vehicle,spaceship,and space station and is processed by ***,tool wear and vibration are the bottlenecks in the milling process of aviation aluminum *** machining accuracy and surface quality of aluminum alloy milling depend on the cutting parameters,material mechanical properties,machine tools,and other *** particular,milling force is the crucial factor to determine material removal and workpiece surface ***,establishing the prediction model of milling force is important and difficult because milling force is the result of multiparameter coupling of process *** research progress of cutting force model is reviewed from three modeling methods:empirical model,finite element simulation,and instantaneous milling force *** problems of cutting force modeling are also *** view of these problems,the future work direction is proposed in the following four aspects:(1)high-speed milling is adopted for the thin-walled structure of large aviation with large cutting depth,which easily produces high residual *** residual stress should be analyzed under this particular condition.(2)Multiple factors(e.g.,eccentric swing milling parameters,lubrication conditions,tools,tool and workpiece deformation,and size effect)should be considered comprehensively when modeling instantaneous milling forces,especially for micro milling and complex surface machining.(3)The database of milling force model,including the corresponding workpiece materials,working condition,cutting tools(geometric figures and coatings),and other parameters,should be established.(4)The effect of chatter on the prediction accuracy of milling force cannot be ignored in thin-walled workpiece milling.(5)The cutting force of aviation aluminum alloy milling under the condition of minimum quantity lubrication(mql)and nanofluid mql should be predicted.

关键词： Milling Aluminum alloy Force model Empirical model Finite element model Instantaneous milling force model

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Effect of Deformation Conditions on Mechanical Properties of Zr-based Metallic Glasses

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Research and Application of materials Science 2020年第2期2卷 43-50页

作者： Zhenxiang ZHAO Chunyan LI Fuping ZHU Xinling LI Shengzhong KOU State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals Lanzhou University of TechnologyLanzhou Gansu 730050 School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou Gansu 730050

In this paper,the effects of different strain rate(1.10-5 s-1,5.10-5 s-1,1.10-4 s-1,5.10-4 s-1,1.10-3 s-1)and aspect ratio(1:1,1.5:1,2:1,2.5:1,3:1)on mechanical properties of Zr-based metallic glasses at room temperature were *** results indicate that as the strain rate increases,the plastic strain and compressive strength of the specimens gradually *** specimen with the strain rate of 1.10-5 s-1 exhibits the higher plastic strain of 10.25%,compressive strength of 2002 MPa and fracture strength of 1999 *** addition,accompanied with the increase in aspect ratio,the plastic strain of the specimens declines from 25.42%to 1.97%,meanwhile,the compressive strength and fracture strength of the specimens also present declining trend.

关键词： Zr-based Metallic glasses mechanical properties plastic strain strain rate aspect ratio

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Ti3c2 Mxene Modified Znfe2o4 for Tetracycline Degradation by Activation of Persulfate Under Visible Light

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SSRN 2022年

作者： Wang, Qi Zhu, Fang Cheng, Hao Komarneni, Sridhar Ma, Jianfeng School of Environmental Science and Engineering Changzhou University Jiangsu213164 China Guangxi Key Laboratory of Green Processing of Sugar Resources College of Biological and Chemical Engineering Guangxi University of Science and Technology Guangxi545006 China Department of Ecosystem Science and Management Materials Research Institute 204 Materials Research Laboratory The Pennsylvania State University University ParkPA16802 United States

Mxene-based catalysts with specific interfacial characteristics that are beneficial for photocatalysis are reported here. Herein, Ti3C2 MXene modified ZnFe2O4 composites were prepared and their morphology and structure were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), High-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS), which revealed that Ti3C2 MXene occurred as quantum dots (QDs) and it was uniformly distributed on the ZnFe2O4 surface. The Ti3C2 QDs modified ZnFe2O4 catalyst (ZnFe2O4/MXene-15%) under visible light achieved 87% degradation efficiency of tetracycline within 60 min when coupled with persulfate (PS) system. The initial solution pH, PS dosage and co-existing ions were found to be the main factors affecting the heterogeneous oxidation process. The radical quenching experiments showed that O2•- plays a major role in the removal of organic pollutants in ZnFe2O4/MXene-PS system. In addition, the cyclic experiments suggested that ZnFe2O4/MXene catalyst showed good stability and it could have practical utility. © 2022, The Authors. All rights reserved.

关键词： Degradation

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Enhance Mechanical Property and Electrical Conductivity Simultaneously of Sn-Cu-Co Solder Alloys by Directional Solidification

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SSRN 2023年

作者： Fan, Jianglei Wang, Jiaojiao Wang, Xiao Liu, Zhanyun Wu, Shen Wang, Yan Li, Ying Xiangkui, Zhou Wei, Shizhong Henan Provincial Key Laboratory of Intelligent Manufacturing of Mechanical Equipment Zhengzhou University of Light Industry Zhengzhou China Institute of Mechanical and Electrical Engineering Zhengzhou University of Light Industry Zhengzhou China School of Energy and Power Engineering Zhengzhou University of Light Industry Zhengzhou China Henan Engineering Research Center of Advanced Materials Processing and Testing Zhengzhou University of Light Industry Zhengzhou China Henan University of Science and Technology China

Improving mechanical properties of solder alloy can lead to a decrease in its conductivity. The decrease in conductivity of the solder increase the generation of Joule heat and reduce the reliability of the joint. This problem can be solved by adjusting the solidification parameters of solders. In this paper, the effect of the growth rate (V) on the microstructure evolution, microhardness and electrical conductivity of directionally solidified (DS) Sn-0.7Cu-xCo (x=0.5, 1.0, 1.5, 2.0, mass %) alloys was investigated. The Sn-0.7Cu-xCo alloys consists of a Sn-based solid solution (Sn-ss), Cu6Sn5 phase, and CoSn2 phase. The volume fraction of the CoSn2 phase increases with increasing Co content. In the DS specimen, the CoSn2 phases change from block-shaped to a long strip shape with a long axis direction close to the heat flow direction. With increasing V, the growth direction tends to become disordered due to the weakening of the heat flow effect. The microhardness of DS Sn-0.7Cu-xCo alloys is increased with increasing V due to an increase of solution strengthening effect. At the same V, the microhardness of DS Sn-0.7Cu-xCo alloys is increased with increasing Co content. The conductivity of the DS Sn-0.7Cu-xCo alloys is decreased with increasing V. At V ≤ 20 μm/s, the conductivity of the DS Sn-0.7Cu-xCo alloy is even better than that of the as-cast Sn-0.7Cu alloy. The research results provide a new way to improve strength of solder without reducing joint conductivity. © 2023, The Authors. All rights reserved.

关键词： Tin alloys

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Tuning homogenization of high-strength aluminum alloys through thermodynamic alloying approach

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materials and Design 2022年 221卷

作者： Wang, Yawen Hou, Longgang Su, Hui Tian, Qingkun Yu, Kangcai Eskin, Dmitry Katgerman, Laurens Zhuang, Linzhong State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Beijing100083 China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing Beijing100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology Beijing Beijing100083 China BCAST Brunel University London Kingston Lane Uxbridge MiddlesexUB8 3PH United Kingdom Nanjing Institute for Advanced Transportation Equipment and Technology No. 8 Lanhua Road Pukou District Nanjing211800 China CRRC Beijing Locomotive Co. Ltd. Beijing100072 China Chinalco Materials Application Research Institution Co. Ltd. Beijing102209 China Tomsk State University Tomsk634050 Russia Katgerman Aluminium Technology van Beuningenlaan 10 Leiden2334CC Netherlands Department of Materials Science and Engineering Delft University of Technology Mekelweg 2 Delft2628CD Netherlands

The alloy design and homogenization processes are intimately associated with the microstructure, phase composition and performance for Al-Zn-Mg-Cu alloys. The microstructures and phase composition of a series of Al-Zn-Mg-Cu alloys before and after the homogenization treatments were investigated along with thermodynamic calculation to understand the underlying relationship. The eutectic microstructures (α-Al + M (Mg(ZnAlCu)2)) are dominating with Cu-enriched [AlCuMgZn] particles, both depending on the Zn:Mg ratio and (Cu + Mg) content, in addition to minor constituent θ (Al2Cu) and Al7Cu2Fe phases in the as-cast alloys. The optimal homogenization process was suggested based on the analysis of the residual phases (i.e., the S (Al2CuMg) phase) since all (for low/mediate-(Cu + Mg) alloys) or partially (for high-(Cu + Mg) alloys (∼>4.24 wt%)) S (Al2CuMg) particles were dissolved during the homogenization. This residual S phase may be transformed from the primary M and/or Cu-enriched [AlCuMgZn] phases. The homogenization kinetics calculation results agreed well with above experimental results. A critical (Cu + Mg) level and a linear correlation between Cu and Mg concentrations were revealed based on the thermodynamically modelling, which can be conductive to determine the optimal homogenization process. Furthermore, the solubility limit and stoichiometric balance principles based on controlling the homogenized microstructures can guide the composition design for advanced high-strength aluminum alloys. © 2022 The Authors

关键词： Aluminum alloys

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Molecule Engineering of Coumarin Using "Rotor-Alicyclic" to Reverse Aggregation-Caused Quenching: Facile Access to BioAIEgens

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SSRN 2024年

作者： Li, Shouji Li, Xiaobin Lin, Yuting Liu, Junyu Zhang, Xuedan Zhong, Weiren Li, Juan You, Caifa Wang, Dong Guo, Xin Dong Xu, Xu Cai, Xu-Min Zhang, Can Yang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical Engineering Nanjing Forestry University Nanjing210037 China Institute of Biopharmaceutical and Health Engineering Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen518055 China Shenzhen Bay Laboratory Shenzhen518107 China Advanced Research Institute for Multidisciplinary Science Beijing Institute of Technology Beijing100081 China Key Lab of Industrial Biocatalysis Ministry of Education Tsinghua University Beijing100084 China Beijing Laboratory of Biomedical Materials College of Materials Science and Engineering Beijing University of Chemical Technology Beijing100029 China China Center for AIE Research College of Materials Science and Engineering Shenzhen University Shenzhen518060 China

Aggregation-induced emission luminogens (AIEgens) have been extensively investigated and widely used in biomedical fields. However, AIEgens are mostly derived from petrochemicals, leading to challenges of renewability, sustainability and biocompatibility. Therefore, it is of striking prospect to construct bioproduct-based AIEgens (BioAIEgens) based on the natural profits. Herein, we proposed a straight forward method named "Rotor-Alicyclic" strategy to prepare BioAIEgens with high fluorescence and produce reactive oxygen species (ROS) activities as well as high biosafety for biomedical application. We designed and synthesized four BioAIEgens by introducing two rotors and a naturally rigid alicyclic moiety basing on planar coumarin molecule. Then, the AIE performances were evaluated, especially the fluorescence and the production of ROS activities, indicating the potential in bioimaging and PDT. Mechanistic study proved that the introduction of two rotors can destroy the planar structure to activate the emission at solid state, while the rigid alicyclic moiety can limit the molecular motion in both monomolecular and aggregated states, leading to improved AIE performances. Furthermore, the biosafety of these BioAIEgens were carefully investigated in vitro and in vivo, demonstrating the high biocompatibility. Summarily, we developed a facial method to prepare BioAIEgens for biomedical application. © 2024, The Authors. All rights reserved.

关键词： Molecules

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Efficient synthesis of High-Silica Ssz-13 Zeolite and its Catalytic Performance in Mto Reaction

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SSRN 2022年

作者： Zhu, Xiaochu Gao, Yu Liu, Meng Yang, Ziyao Li, ShuangShuang Chen, Haorong Liu, Bonan Ma, Wangjing Hensen, Emiel J.M. Shen, Baojian State Key Laboratory of Heavy Oil Processing The Key Laboratory of Catalysis of CNPC College of Chemical Engineering and Environment China University of Petroleum Beijing102249 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences 29 Zhongguancun East Road Beijing100190 China Laboratory of Inorganic Materials Chemistry Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands

Highly efficient synthesis of zeolites is an important goal given the many catalytic applications of zeolites in industrial chemical processes. The conventional zeolite syntheses, i.e., hydrothermal synthesis in a batch setup are usually challenged by certain limiting factors deriving from the long synthesis period or the low yield. Herein, we report that a combined strategy of organic promoter and zeolite seeding can remarkably improve the synthetic efficiency of high silica SSZ-13 zeolite. The low-cost promoter diethylamine (DEA) and zeolite seeds could both remarkably accelerate the crystallization rate of SSZ-13 zeolite, and DEA has a much higher beneficial effect on the solid yield as compared to the zeolite seeds. Consequently, the crystallization time could be unprecedentedly shorted by a factor of 30, instead of multiple days normally required. Besides, this novel protocol also exhibits high atom efficiency (93% of yield). The resultant high-silica nano-sized SSZ-13 zeolite shows good (hydro)thermal stability along with excellent catalytic performance for the MTO reaction. Furthermore, the strategy has been extended to the fast synthesis of other zeolitic material, like ZSM-5, implying its general applicability in highly efficient synthesis of zeolites. © 2022, The Authors. All rights reserved.

关键词： Zeolites

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Cellulose Hydrogel-Based Biodegradable and Recyclable Magnetoelectric Composites for Electromechanical Conversion

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SSRN 2022年

作者： Hu, Sanming Zheng, Min Wang, Qi Li, Ling Xing, Jun Chen, Kun Qi, Fuyu He, Pengyu Mao, Lin Shi, Zhijun Su, Bin Yang, Guang School of Biomedical Engineering and Imaging Xianning Medical College Hubei University of Science and Technology Xianning437100 China College of Life Science and Technology Huazhong University of Science and Technology Wuhan430074 China Huazhong University of Science and Technology China State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China College of Life Sciences Henan Agricultural University Zhengzhou450002 China

Flexible electromechanical conversion devices have attracted enormous attention as energy harvesters and self-powered sensors in the fields of wearable electronics and robotics. However, current flexible devices composed of plastic polymers and metals suffer from non-degradability and limited recyclability. Herein, a biodegradable and recyclable hydrogel-based magnetoelectric (ME) composite is fabricated via introducing NdFeB magnetic particles and copper wires into the regenerated bacterial cellulose (rBC) hydrogel. The developed hydrogel-based ME composites can effectively convert the mechanical kinetic energy into electrical energy based on the principle of electromagnetic induction, which maximum voltage reaches 15 µV. In addition, degradation experiments are conducted in this work to demonstrate the hydrogel can be rapidly degraded within 3 hours under the condition of enzyme and completely natural degraded within 49 days in water, respectively. Moreover, the left NdFeB particles and copper wires can be recyclable and reused for the same devices, leaving no environmentally hazardous electronic waste. © 2022, The Authors. All rights reserved.

关键词： Iron alloys

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