检索结果-内蒙古大学图书馆

In situ STEM Observation of Cation Diffusion and Surface Reconstruction at van der Waals Gaps

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1642-1643页

作者： Cui, Wenjun Lin, Weixiao Lu, Weichao Liu, Chengshan Gao, Zhixiao Ma, Hao Zhao, Wen Van Tendeloo, Gustaaf Sang, Xiahan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Nanostructure Research Center Wuhan University of Technology Wuhan China School of Materials Science and Engineering China University of Petroleum (East China) Qingdao Shandong China Electron Microscopy for Materials Science (EMAT) University of Antwerp Antwerp Belgium

来源：评论

学校读者我要写书评

暂无评论

Anion-templated Self-assembly for the Preparation of Silver-t-butylthiolate Clusters

引用

Chinese Journal of Structural Chemistry 2022年第3期41卷 100-107,I0010页

作者： JIN Jun-Ling SHEN Yang-Lin MI Li-Wei XIE Yun-Peng LU Xing Henan Key Laboratory of Functional Salt Materials Center for Advanced Materials ResearchZhongyuan University of TechnologyZhengzhou 450007China College of Materials Engineering Henan International Joint Laboratory of Rare Earth Composite MaterialsHenan University of EngineeringZhengzhou 451191China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Silver thiolate polymers are intercepted to form different structural fragments when reacting with variant solubilizing reagents,which usually serve as the starting point for the preparation of ***,such a process is still far from ***,we report the controlled synthesis of silver-t-butylthiolate clusters from reactions of polymeric[Ag^(t)BuS]n and suitable templates in the presence of solubilizing reagents to offer a detailed look at the mechanism of cluster’s *** the provided solubilizing reagents have weak coordina-tion ability,such as O-or N-donating ligands,the obtained polymeric compound retains the linear structure pat-tern that S and Ag atoms are arranged *** extra templates NO_(3)^(−)and CO_(3)^(2−)are applied,the disk-like clusters Ag_(19)and Ag_(20)are constructed with the same[Ag^(t)BuS]_(5)circles that may directly cyclize from the linear[Ag^(t)BuS]_(n)*** contrast,(EtO)_(2)PS_(2)^(−)and(iPrO)_(2)PS_(2)^(−)anions have large size and strong coordination abil-ity rendering the structure of the polymer completely *** extremely short[Ag^(t)BuS]n pieces with silver ions and solubilizing ligands assemble around the templates V_(2)O_(7)^(4−)and W_(2)O_(9)^(4−),leading to the formation of clusters Ag_(22)and Ag_(24).

关键词： silver cluster X-ray crystal structure silver thiolate polymer self-assembly

来源：评论

学校读者我要写书评

暂无评论

Effects of heat treatments on microstructures of TiAl alloys

引用

International Journal of Minerals,Metallurgy and materials 2022年第6期29卷 1225-1230页

作者： Wen Yu Jianxin Zhou Yajun Yin Zhixin Tu Xin Feng Hai Nan Junpin Lin Xianfei Ding State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Beijing Institute of Aeronautical Materials Co. Ltd.Beijing 100094China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This study aims to investigate the effects of heat treatments on the microstructure ofγ-TiAl *** Ti-47Al-2Cr-2Nb alloy ingots were manufactured by casting method and then heat-treated in two types of heat *** microstructures were studied by both optical and scanning electron *** chemical compositions of two ingots were determined as *** ingot with lower Al content only obtains lamellar structures while the one higher in Al content obtains nearly lamellar and duplex structures after heat treatment within1270 to 1185℃.A small amount of B2 phase is found to be precipitated in both as-cast and heat-treated *** are distributed at grain boundaries when holding at a higher temperature,such as 1260℃.However,B2 phase is precipitated at grain boundaries and in colony interiors simultaneously after heat treatments happened at 1185℃.Furthermore,the effects of heat treatments on grain refinement and other microstructural parameters are discussed.

关键词： TiAl alloys microstructure heat treatment casting

来源：评论

学校读者我要写书评

暂无评论

Effectiveness Evaluation Study of Self-made Zinc Alloy Sacrificial Anode under Chloride Salt Erosion Environment

引用

Journal of Wuhan University of technology(materials Science) 2023年第1期38卷 222-230页

作者：南雪丽 JI Jianrui LI Rongyang CHEN Hao WANG Yi TANG Weibin School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China Gansu Province Transportation Planning Survey&Design Institute Co.Ltd.Lanzhou 730000China

To investigate the effectiveness of self-made zinc alloy sacrificial anode material for the protection of reinforcement in concrete under chlorine salt erosion environment,salt solution immersion corrosion and electromigration accelerated corrosion tests were used to evaluate the effectiveness of self-made zinc alloy anode with the help of relevant cathodic protection guidelines and evaluation criteria for the corrosion of reinforcement in *** results showed that the protection was effective because the potential of the zinc alloy anode protection steel bar in the salt solution satis?ed the“-780 mV(SCE)”validity *** self-corrosion potential(E_(corr))of the sacri?cial anode protection steel in concrete was greater than-276 mV,and the protective current density of the zinc alloy anode was 1-3μA·cm^(-2),which met the standards of EN12696-2000,further indicating that the self-made zinc alloy sacri?cial anode had a good protection combining with the polarization resistance and the appearance of the corroded surface of the steel in *** microscopic morphology of the corroded surface and the composition of the corrosion products indicates that the mortar of the self-made zinc alloy anode has a lower pH than the imported anodes,so the long-term protection of the selfmade zinc alloy sacri?cial anode needs to be further improved.

关键词： zinc alloy anode cathodic protection steel corrosion concrete polarization curve

来源：评论

学校读者我要写书评

暂无评论

A wear-resistant metastable CoCrNiCu high-entropy alloy with modulated surface and subsurface structures

引用

Friction 2022年第10期10卷 1722-1738页

作者： Yue REN Qian JIA Yin DU Qing ZHOU Christian GREINER Ke HUA Haifeng WANG Jian WANG State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Institute for Applied Materials Karlsruhe Institute of TechnologyKarlsruhe 76131Germany Mechanical and Materials Engineering University of Nebraska-LincolnNebraska 68588USA

Sliding friction-induced subsurface structures and severe surface oxidation can be the major causes influencing the wear resistance of ductile metallic ***,we demonstrated the role of subsurface and surface structures in enhancing the wear resistance of an equiatomic metastable CoCrNiCu high-entropy alloy(HEA).The CoCrNiCu HEA is composed of a CoCrNi-rich face-centered cubic(FCC)dendrite phase and a Cu-rich FCC inter-dendrite *** Cu-rich nano-precipitates are formed and distributed uniformly inside the dendrites after tuning the distribution and composition of the two phases by thermal *** the formation of nano-precipitates decreases the hardness of the alloy due to the loss of solid solution strengthening,these nano-precipitates can be deformed to form continuous Cu-rich nanolayers during dry sliding,leading to a self-organized nano-laminated microstructure and extensive hardening in the *** addition,the nano-precipitates can facilitate the formation of continuous and compacted glaze layers on the worn surface,which are also beneficial for the reduction of the wear rate of *** current work can be extended to other alloy systems and might provide guidelines for designing and fabricating wear-resistant alloys in general.

关键词： high-entropy alloys(HEA) wear nano-laminated structure oxidation atomic force microscope(AFM)

来源：评论

学校读者我要写书评

暂无评论

Ultra-small platinum nanoparticles segregated by nickle sites for efficient ORR and HER processes

引用

Journal of Energy Chemistry 2022年第2期31卷 48-54页

作者： Lvhan Liang Huihui jin Huang Zhou Bingshuai Liu Chenxi Hu Ding Chen Jiawei Zhu Zhe Wang Hai-Wen Li Suli Liu Daping He Shichun Mu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryXianhu Hydrogen ValleyFoshan 528200GuangdongChina Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070HubeiChina Platform of Inter/Transdisciplinary Energy Research International Research Center for Hydrogen EnergyInternational Institute for Carbon-Neutral Energy ResearchYushu UniversityFukuoka 819-0395Japan Key Laboratory of Advanced Functional Materials of Nanjing Nanjing Xiaozhuang UniversityNanjing 211171JiangsuChina

In the electrochemical process,Pt nanoparticles(NPs)in Pt-based catalysts usually agglomerate due to Oswald ripening or lack of restraint,ultimately resulting in reduction of the active sites and catalytic *** to uniformly disperse and firmly fix Pt NPs on carbon matrix with suitable particle size for catalysis is still a big ***,to prevent the agglomeration and shedding of Pt NPs,Ni species is introduced and are evenly dispersed in the surface of carbon matrix in the form of Ni-N-C active sites(Ni ZIF-NC).The Ni sites can be used to anchor Pt NPs,and then effectively limit the further growth and agglomeration of Pt NPs during the reaction *** with commercial Pt/C catalyst,Pt@Ni ZIF-NC,with ultralow Pt loading(7 wt%)and ideal particle size(2.3 nm),not only increases the active center,but also promotes the catalysis kinetics,greatly improving the ORR and HER catalytic *** acidic conditions,its half-wave potential(0.902 V)is superior to commercial Pt/C(0.861 V),and the mass activity(0.38 A per mg Pt)at 0.9 V is 4.7 times that of Pt/C(0.08 A per mg Pt).Besides,it also shows outstanding HER *** 20 and 30 mV,its mass activity is even 2 and 6 times that of Pt/C,*** it is under ORR or HER conditions,it still shows excellent *** undoubtedly indicate the realization of dual-functional catalysts with low-Pt and high-efficiency properties.

关键词： Oxygen reduction reaction Hydrogen evolution reaction Zeolitic imidazolate frameworks Nickle site Pt nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Mechanisms of photoluminescence in the molecular state of carbon dots prepared from o-phenylenediamine

引用

Chinese Chemical Letters 2023年第7期34卷 1-2页

作者： Feishi Shan Jing Zhang Chengshuang Liao Zhouyu Wang Leyong Wang Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan Province Research and Application of Small Organic Chiral Molecules Key Laboratory of Yibin CityDepartment of ChemistryXihua UniversityChengdu 610039China State Key Laboratory of Analytical Chemistry for Life Science Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Carbon dots (CDs) is an emerging photoluminescent (PL) carbon *** its discovery in 2004 [1],CDs have been used in a wide range of applications such as sensing,optical devices,invitro imaging,in-vivo imaging and photot... 详细信息

关键词： material. carbon state

来源：评论

学校读者我要写书评

暂无评论

Molecular confined synthesis of magnetic CoO_(x)/Co/C hybrid catalyst for photocatalytic water oxidation and CO_(2)reduction

引用

Chinese Chemical Letters 2023年第12期34卷 328-332页

作者： Rui Li Chenchen Zhang Kejia You Bonan Li Wei Bu Xiangyu Meng Baochun Ma Yong Ding State Key Laboratory of Applied Organic Chemistry Key Laboratory of Advanced Catalysis of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Henan Provincial Key Laboratory of Nanocomposites and Applications Institute of Nanostructured Functional MaterialsHuanghe Science and Technology CollegeZhengzhou450006China

Photosynthesis[6CO_(2)+12H_(2)O→(CH_(2)O)+6O_(2)+6H_(2)O]in nature contains a light reaction process for oxygen evolution and a dark reaction process for carbon dioxide(CO_(2))reduction to carbohydrates,which is of great significance for the survival of living ***,for simulating photosynthesis,it is desirable to design and fabricate a bifunctional catalyst for promoting photocatalytic water oxidation and CO_(2)reduction ***,a molecular confined synthesis strategy is reasonably proposed and applied,that is the bifunctional CoO_(x)/Co/C-T(T=700,800 and 900℃)photocatalysts prepared by the pyrolysis of molecular Co-EDTA under N_(2) and air atmosphere in *** the prepared photocatalysts,the CoOx/Co/C-800 shows the best photocatalytic water oxidation activity with an oxygen yield of 51.2%.In addition,for CO_(2)reduction reaction,the CO evolution rate of 12.6μmol/h and selectivity of 75%can be achieved over this *** improved photocatalytic activities are attributed to the rapid electron transfer between the photosensitizer and the catalyst,which is strongly supported by the current densityvoltage G-V,steady-state and time-resolved photoluminescence spectra(PL).Overall,this work provides a reference for the preparation and optimization of photocatalysts with the capacity for water oxidation and CO_(2)reduction reactions.

关键词： CoO_(x)/Co/C Water oxidation CO_(2)reduction Photocatalyst Photosensitizer

来源：评论

学校读者我要写书评

暂无评论

Crevice corrosion of reinforcing steel in carbonated simulated concrete pore solutions contaminated by chloride

引用

Journal of Iron and Steel Research International 2025年第1期32卷 293-311页

作者： Peng-peng Wu Yuan-pei Gong Shao-hua Zhang Yue-zhong Zhang Bao-sheng Liu Guang-ling Song College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina College of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina School of Mechanical and Mining Engineering Centre for Advanced Materials Processing and Manufacturing(AMPAM)The University of QueenslandSt LuciaQLD4072Australia State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen361005FujianChina

The crevice corrosion of the reinforcing steel in the carbonated simulated concrete pore solutions(SCPSs)containing 0.04 mol/L chloride was *** comparison,the steel without crevice covered on its surface was also *** showed that the crevice corrosion in the uncarbonated SCPS was not triggered and the steel remained passivity by suppressing the anodic dissolution in the crevice *** SCPS was carbonated to have pH values of 10.5 and 11.5,the crevice corrosion was easier to be activated than the widely reported pitting corrosion owing to the rapid oxygen depletion within the crevice,but the crevice corrosion damage might be alleviated to a certain extent due to the relative compact surface film formed inside the *** further carbonation led to the activation dissolution of both the crevice interior and exterior,causing the more serious corrosion *** process of the crevice corrosion was systematically analyzed by combining the electrochemical measurement results and Evens polarization diagram.

关键词： Crevice corrosion Reinforcing steel Carbonation Electrochemical test Rust Evens polarization diagram

来源：评论

学校读者我要写书评

暂无评论

Highly Flexible Graphene-Film-Based Rectenna for Wireless Energy Harvesting

引用

Energy & Environmental materials 2024年第2期7卷 320-325页

作者： Jingwei Zhang Yuchao Wang Rongguo Song Zongkui Kou Daping He Hubei Engineering Research Center of RF-Microwave Technology and Application School of ScienceWuhan University of TechnologyWuhan 430070China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Herein,we report the design,fabrication,and performance of two wireless energy harvesting devices based on highly flexible graphene macroscopic films(FGMFs).We first demonstrate that benefiting from the high conductivity of up to 1×10^(6)S m^(-1)and good resistive stability of FGMFs even under extensive bending,the FGMFs-based rectifying circuit(GRC)exhibits good flexibility and RF-to-DC efficiency of 53%at 2.1 ***,we further expand the application of FGMFs to a flexible wideband monopole rectenna and a 2.45 GHz wearable rectenna for harvesting wireless *** wideband rectenna at various bending conditions produces a maximum conversion efficiency of 52%,46%,and 44%at the 5th Generation(5G)2.1 GHz,Industrial Long-Term Evolution(LTE)2.3 GHz,and Scientific Medical(ISM)2.45 GHz,respectively.A 2.45 GHz GRC is optimized and integrated with an AMC-backed wearable *** proposed 2.45 GHz wearable rectenna shows a maximum conversion efficiency of 55.7%.All the results indicate that the highly flexible graphene-film-based rectennas have great potential as a wireless power supplier for smart Internet of Things(loT)applications.

关键词： flexible rectennas highly flexible graphene-based films wireless energy harvesting

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：