检索结果-内蒙古大学图书馆

Manipulating hot carrier cooling in silicon phononic crystals opens new application opportunities

Chinese Chemical Letters 2023年第9期34卷 1-2页

作者： Peng Zhou Shaojuan Lu Wangnan Li Shulai Lei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyang 441053China Hubei Institute of Aerospace Chemotechnology Xiangyang 441003China Hubei Longzhong Laboratory Xiangyang 441000China

Phononic crystals(PnCs)have had a multiple of important and promising applications such as sonic diodes,acoustic cloaking,optomechanic,and thermoelectrics[1–5].Undoubtably,it is of significance to explore new finding... 详细信息

关键词： diodes application finding

来源：评论

学校读者我要写书评

暂无评论

Multi-scale Modeling and Simulation of Low Pressure Die Casting of Aluminum Alloys 75

Multi-scale Modeling and Simulation of Low Pressure Die Cast...

引用

75th World Foundry Congress, WFC 2024

作者： Tan, Yunxiang Ma, Juhuai Xu, Qingyan Key Laboratory for Advanced Materials Processing Technology Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing100084 China

Aluminum alloys distinguish themselves through their notable properties, including low weight, robust strength, and versatile formability, which facilitate the production of extensive, intricate, and thin-walled castings using low pressure die casting processes. These distinctive features significantly contribute to the advancement of automotive lightweighting initiatives, which are essential in optimizing fuel consumption and mitigating environmental footprints. This study aims to optimize the low pressure die casting process of Al-Si alloys for automotive components through integrated numerical simulations. A software framework has been developed to couple macro-simulation of mold filling and solidification with microstructural evolution and mechanical property prediction. A novel nucleation model, validated with experimental data, enhances the accuracy of primary phase growth simulations. Models for dendritic and eutectic phase growth are also presented, considering solute diffusion, growth kinetics, and interface anisotropy. This multiscale approach enables the prediction of microstructures and mechanical properties, facilitating the optimization of casting parameters to enhance the final properties of the castings. The results demonstrate the potential to reduce production costs and accelerate the development cycle for aluminum alloy castings. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Effect of Fe Content on the Corrosion Behavior of FCC Structured NiCrFeCo-Based MPEAs 75

Effect of Fe Content on the Corrosion Behavior of FCC Struct...

引用

75th World Foundry Congress, WFC 2024

作者： Liu, Shiyu Fu, Zhiqiang Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of Technology Guangdong Guangzhou510641 China

In this work, NiCrCoAlMoFex multi-principal element alloys (MPEAs) were fabricated by arc melting method. The influence of Fe content on the corrosion behavior in 0.6 M NaCl solution was investigated in solid solution FCC-structured samples without any precipitation phase. The experimental results showed the corrosion resistance are firstly enhanced and then deteriorated with increased Fe content. The sample with 8 at.% Fe exhibited the best corrosion resistance due to the better passive film with less defect density. With the Fe increased to 16 at.%, more defects were formed within the corresponding passive film resulting in worse corrosion resistance. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional ordered hierarchically porous carbon materials for high performance Li-Se battery

引用

Journal of Energy Chemistry 2022年第5期31卷 624-636页

作者： Hongyan Li Wenda Dong Chao Li Tarek Barakat Minghui Sun Yingying Wang Liang Wu Lang Wang Lei Xia Zhi-Yi Hu Yu Li Bao-Lian Su Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 NamurBelgium Namur Institute of Structured Matter(NISM) University of NamurB-5000 NamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430074HubeiChina

Developing host materials with high specific surface area, good electron conductivity, and fast ion transportation channel is critical for high performance lithium-selenium(Li-Se) batteries. Herein, a series of three dimensional ordered hierarchically porous carbon(3D OHPC) materials with micro/meso/macropores are designed and synthesized for Li-Se battery. The porous structure is tuned by following the concept of the generalized Murray’s law to facilitate the mass diffusion and reduce ion transport *** optimized 3D Se/OHPC cathode exhibits a very high 2 nd discharge capacity of 651 m Ah/g and retains 361 m Ah/g after 200 cycles at 0.2 C. Even at a high current rate of 5 C, the battery still shows a discharge capacity as high as 155 m Ah/g. The improved electrochemical performance is attributed to the synergy effect of the interconnected and well-designed micro, meso and macroporosity while shortened ions diffusion pathways of such Murray materials accelerate its ionic and electronic conductivities leading to the enhanced electrochemical reaction. The diffusivity coefficient in Se/OHPC can reach a very high value of 1.3 × 10^(-11)cm^(2)/s, much higher than those in single pore size carbon hosts. Their effective volume expansion accommodation capability and reduced dissolution of polyselenides ensure the high stability of the battery. This work, for the first time, established the clear relationship between textural properties of cathode materials and their performance and demonstrates that the concept of the generalized Murray’s law can be used as efficient guidance for the rational design and synthesis of advanced hierarchically porous materials and the great potential of 3D OHPC materials as a practical high performance cathode material for Li-Se batteries.

关键词： 3D ordered hierarchically porous carbon(OHPC) Shuttle effect Cyclability High rate capability The generalized Murray’s law Li-Se batteries

来源：评论

学校读者我要写书评

暂无评论

Carbon-coated ZnO Nanocomposite Microspheres as Anode materials for Lithium-ion Batteries

引用

Journal of Wuhan University of technology(materials Science) 2023年第3期38卷 490-495页

作者：范影强陈秀娟 XU Dan State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Mechanical and Electronical Engineering Lanzhou University of TechnologyLanzhou 730050China

The carbon-coated ZnO nanospheres materials have been synthesized via a simple hydrothermal *** effect of carbon content on the microstructure,morphology and electrochemical performance of the materials was investigated by XRD,Raman spectroscopy,transmission electron microscopy,scanning electron microscopy and electrochemical *** results show that the spherical ZnO/C material with a carbon cladding content of 10%is very homogeneous and approximately 200 nm in *** electrochemical performances of the ZnO/C nanospheres as an anode materials are *** ZnO/C exhibits better stability than pure ZnO,excellent lithium storage properties as well as improved circulation *** Coulomb efficiency of the ZnO/C with 10%carbon coated content reaches 98%.The improvement of electrochemical performance can be attributed to the carbon layer on the ZnO *** large volume change of ZnO during the charge-discharge process can be effectively relieved.

关键词： ZnO carbon coating anode material lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Selective photosynthesis of imines from biomass-derived aldehydes over Ni/TiO_(2)

引用

Rare Metals 2024年第3期43卷 1116-1124页

作者： Wu-Lin Li Qing-Qing Zhang Lin Dong Wen-Jun Zhang Li-Li Lin Zu-Peng Chen Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing210037China Institute of Industrial Catalysis State Key Laboratory of Green Chemistry Synthesis TechnologyCollege of Chemical EngineeringZhejiang University of TechnologyHangzhou310014China

Photocatalytic reductive amination of biomass-derived aldehydes is a desirable way to selectively upgrade biomass into value-added nitrogen-containing chemicals under mild ***,it is challenging to produce imines in high selectivity because of the undesirable side reactions caused by the activity of functional ***,we demonstrate the highly reactive and selective production of imines from biomass derived aldehydes via the photocatalytic reductive amination,using a defective TiO_(2)supported nickel *** employment of methanol as the hydrogen donor and ammonia solution as the nitrogen source avoids the use of high-pressure H_(2)and expensive amines,rendering the current catalytic process safe,economical,and environmentally *** depth investigations attribute the improved separation and transfer of photogenerated charge carriers to the presence of oxygen vacancies and decorated Ni nanoparticles,thereby accelerating the production of imines from benzaldehyde amination(conversion,95.8%;seleetivity,95.2%).Furthermore,the developed system could be easily translated to the photocatalytic conversions of various biomass derived aldehydes,which provided an example of a cost-effective and sustainable approach for the valorization of biomass derived feedstocks.

关键词： Photocatalysis Biomass derivatives Imines Reduction amination Heterogeneous catalyst

来源：评论

学校读者我要写书评

暂无评论

Electron-injection-engineering induced dual-phase MoO2.8F0.2/MoO2.4F0.6 heterostructure for magnesium storage

引用

National Science Review 2024年第8期11卷 240-252页

作者： Weixiao Wang Fangyu Xiong Shaohua Zhu Mengyu Yan Xiaobin Liao Kesong Yu Lianmeng Cui Jinghui Chen Junjun Wang Ruoqi Lan Jun Xie Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Hubei Longzhong Laboratory Wuhan University of Technology(Xiangyang Demonstration Zone) Hainan Institute Wuhan University of Technology

Rechargeable magnesium batteries（RMBs） have received increased attention due to their high volumetric capacity and ***,the sluggish diffusion kinetics of highly polarized Mg2+in host lattices severely hinders the development of ***,we report an electron injection strategy for modulating the Mo 4d-orbital splitting manner and first fabricate a dual-phase M0O2.8F0.2/MoO2.4F0.6heterostructure to accelerate Mg2+*** electron inje ction strategy triggers weak Jahn-Teller distortion in MoO6octahedra and reorganization of the Mo 4d-orbital,leading to a partial phase transition from orthorhombic phase MiO2.8F0.2to cubic phase *** a result,the designed heterostructure generates a built-in electric field,simultaneously improving its ele ctronic conductivity and ionic diffusivity by at least one order of magnitude compared to MoO2.8F0.2and ***,the assembled MoO2.8F0.2/MoO2.4F0.6//Mg full cell exhibits a remarkable reversible capacity of 172.5 mAh g-1at0.1 A g-1,pushing forward the orbital-scale manipulation for high-performance RMBs.

关键词： rechargeable magnesium batteries electron injection strategy dual-phase heterostructure electronic conductivity ionic diffusivity

来源：评论

学校读者我要写书评

暂无评论

Development of new ductile iron with super-high thermal conductivity and elongation

引用

Journal of Iron and Steel Research International 2022年第3期29卷 462-473页

作者： Guang-hua Wang Yan-xiang Li School of Materials Science and Engineering Tsinghua UniversityBeijing100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing100084China

The effects of Si content,graphite volume fraction and pearlite volume fraction on the thermal conductivity of ductile iron were studied based on theoretical model *** results showed that the thermal conductivity of ductile iron was more sensitive to Si content compared with the volume fractions of pearlite and *** key method to design and develop high thermal conductivity ductile iron was to control the Si *** 0.9-2.2 wt.%Si content,experimental results showed that with the increase in Si content,the thermal conductivity of ductile iron decreased dramatically,and the yield strength and tensile strength of ductile iron almost linearly increased,but the elongation remained almost *** dependence of thermal conductivity of ductile iron on temperature changed from monotonic decreasing to increasing first and then ***,we broke the common composition range of ductile iron and designed a new high C(≥3.9 wt.%)and low Si(1.0-1.4 wt.%)ductile iron with super-high thermal conductivity and *** thermal conductivity exceeded 40 W/(m K)within 27-300℃,and maintained at 35-40 W/(m K)at 500℃.The elongation was over 25%,and the tensile strength was more than 300 MPa.

关键词： Thermal conductivity Ductile iron Elongation Tensile strength Silicon alloying

来源：评论

学校读者我要写书评

暂无评论

Anthracene-bridged“Texas-sized”box for the simultaneous detection and uptake of tryptophan

引用

Chinese Chemical Letters 2024年第9期35卷 175-178页

作者： Dan Luo Jinya Tian Jianqiao Zhou Xiaodong Chi State Key Laboratory of Materials Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518057China

Tryptophan(Trp)is an essential amino acid that plays a critical role in human *** increasing demand for Trp has created a highly promising market,underscoring the urgent necessity for the development of efficient strategies for the simultaneous detection and uptake of ***,we report an expanded“Texas-sized”molecular box(An-TxSB),which incorporates luminescent anthracene bridging subunits and molecular recognition *** luminescent molecular box demonstrates exceptional sensitivity to Trp in water,permitting its precise quantification with a notably low limit of detection(LOD)of 0.42μmol/***,An-TxSB facilitates the proficient uptake of Trp from simulated water samples,thereby revealing an impressive Trp adsorption capacity of up to 226.0μmol/g.

关键词： Macrocycles Host-guest chemistry Biomolecular sensors Molecular recognition Adsorption

来源：评论

学校读者我要写书评

暂无评论

Tuning metal-support interaction of Pt-based electrocatalysts for hydrogen energy conversion

引用

Science China Chemistry 2023年第12期66卷 3398-3414页

作者： Shenzhou Li Tanyuan Wang Qing Li State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000China

Pt-based electrocatalysts hold great promise for key electrocatalytic reactions in hydrogen-related energy conversion ***,the catalytic performance is significantly influenced by metal-support interactions(MSI)in the catalysts,making the tuning of MSI in Pt-based catalysts a highly intriguing research *** this review,the catalytic mechanism of Pt-based electrocatalysts is firstly ***,the effects of MSI on supported Pt electrocatalysts are summarized into four types:geometric effects,electronic effects,synergistic effects,and structural ***,the prospect of optimizing the performance of Pt-based electrocatalysts by engineering MSI is exhibited,with the aim of inspiring innovation and advancement of supported Pt catalysts,thereby facilitating the development and utilization of hydrogen energy.

关键词： metal-support interaction Pt-based catalysts electrocatalysis hydrogen evolution reaction oxygen reduction reaction

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：