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in situ SR-CT Experimental Study on the Directional Sintering of High-Temperature Superconductor YBCO Materials in the Microwave Fields

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 67-77页

作者： Liangyuan Wang Lei Shen Yongcun Li Yuanjie Wang Yu Xiao Xingyi Zhang Feng Xu Xiaofang Hu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaAnhui230027China Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China Lanzhou UniversityLanzhou730000China Shanxi Key Lab of Material Strength&Structural Impact College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan030024China

YBa_(2)Cu_(3)O_(7-x)(YBCO)is a kind of high-temperature superconducting material that has important application in information,energy,medical treatment,etc.,and the superconducting properties of YBCO are closely related to its internal *** this study,the microwave heating method was adopted to prepare the YBCO *** internal 3 D online evolution observation based on the synchrotron radiation computed tomography technology shows that there was directional grain growth phenomenon of YBCO during microwave sintering *** local regions with special microstructure,these particles grew to the same ***,the theoretical models of single and multiple particles in the microwave electromagnetic fields were *** on these theoretical models and finite element analysis,it shows that the YBCO particles can modulate the distribution of electromagnetic fields,resulting in the significantly higher electric field intensity at the particle junctions than other ***,there were very high electric field intensity and temperature gradients in the directions of particle *** factors were crucial in directional *** results will provide theoretical basis and technical guidance for the controllable preparation and performance optimization of the internal microstructure of superconducting materials in the preparation process.

关键词： Synchrotron radiation computed tomography Microwave sintering Microstructure in situ

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in situ investigation of the mechanical properties of nanomaterials by transmission electron microscopy

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Acta Mechanica Sinica 2012年第6期28卷 1513-1527页

作者： Jun Sun Feng Xu Li-Tao Sun SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Southeast University

With the progress of modern transmission elec- tron microscopy （TEM） and development of dedicated func- tional TEM specimen holders, people can now manipulate a nano-object with nanometer-range precision and simulta- neously acquire mechanical data together with atomic-scale structural information. This advanced methodology is play- ing an increasingly important role in nanomechanics. The present review summarizes relevant studies on the in situ in- vestigation of mechanical properties of various nanomateri- als over the past decades. These works enrich our knowledge not only on nanomaterials （such as carbon nanotubes, car- bon onions, boron nitride nanotubes, silicon nanowires and graphene, etc.） but also on mechanics at the nanoscate.

关键词： Nanomaterials Transmission electron mi-croscopy in situ Nanoscale mechanics

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in situ fluorinated solid electrolyte interphase towards long-life lithium metal anodes

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Nano Research 2020年第2期13卷 430-436页

作者： Shan-Min Xu Hui Duan Ji-Lei Shi Tong-Tong Zuo Xin-Cheng Hu Shuang-Yan Lang Min Yan Jia-Yan Liang Yu-Guo Yang Qing-Hua Kong Xing Zhang Yu-Guo Guo School of Science Beijing Jiaotong UniversityBeijing 100044China CAS Key Laboratory of Molecular Nanostructure and Nanotechmology CAS Research/Education Center for Excellence in Molecular Sciences and Beijing National Laboratory for Molecular Sciences(BNLMs)Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The urgent demands for high-energy-density rechargeable batteries promote a flourishing development of Li metal ***,the uncontrollable dendrites growth and serious side reactions severely lirmit its commercial ***,an artificial LiF-rich solid electrolyte interphase(SEl)is constructed at molecular-level using one-step photopolymerization of hexafluorobutyl acrylate based solution,where the LiF is in situ generated during photopolymerization process(denoted as PHALF).The LiF-rich layercomprised flexible polymer matrix and inorganic LiF filler not only ensures intimate contact with Li anode and adapts volume fluctuations during cycling but also regulates Li deposition behavior,enabling it to suppress the dendrite growth and block side reactions between the electrolyte and Li ***,the PHALF-Li anode presents superior stable cycling performance over 500 h at 1 mA·cm^-2 for 1 mA·h·cm^-2 without dendrites growth in carbonate *** work provides a novel approach to design and build in situ artificial SEl layer for high-safety and stable Li metal anodes.

关键词： lithium metal batteries artificial in situ solid electrolyte interphase LiF

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in situ rapid versatile method for the preparation of zirconium metal-organic framework filters

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Science China Chemistry 2022年第12期65卷 2462-2467页

作者： Hang Wang Xingmao Zhang Ruxin Yao Shuang Zhao Pengfei Zhao Ruile Yang Lin Wang Yichao Huang Tong Wei Xiang Li Zhuangjun Fan Bo Wang School of Materials Science and Engineering China University of PetroleumQingdao266580China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster ScienceMinistry of EducationSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing100081China Key Laboratory of Magnetic Molecules&Magnetic Information Materials(Ministry of Education) Institute of Chemistry and CultureSchool of Chemistry&Material ScienceShanxi Normal UniversityTaiyuan030006China

The development of the rapid preparation of highly stable metal-organic framework(MOF)-based devices provides the possibility of meeting the increasing demands of MOF in industrial ***,MOFs experience poor processability and stable high-valence-metal(Ⅳ)-based MOFs favor forming either thermodynamically stable metal hydroxides or oxides during their growth and nucleation,which hinders their practical ***,we present a versatile deep eutectic solvent(DES)-assisted hot pressing method to in situ rapidly prepare six distinct zirconium-based MOF nanocrystals on fibers(denoted as Zr-MOFilters)within 20 min.A small amount of DES promotes MOF precursor contact and accelerates Zr-MOF *** and pressure facilitate the formation of Zr-MOFs onto desired *** situ1H nuclear magnetic resonance spectra and time-dependent Fourier-transform infrared spectra were conducted to elucidate the growth of Zr-MOF *** a proof-of-concept,the abilities of Zr-MOFilters for Cr_(2)O_(7)^(2−) and micro(nano)plastics removal have been *** strategy paves the way for the rapid fabrication of highly stable MOF-based devices and brings MOFs a step closer to practical application.

关键词： in situ UiO-66 DES hot pressing filter pollutant control

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in situ identification of active sites during electrocatalytic hydrogen evolution

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Nano Research 2023年第12期16卷 12910-12918页

作者： Dongge Wang Juanxia Wu Liying Jiao Liming Xie CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China

The rational design of efficient,low cost,and durable catalysts is critical for the industrial applications of electrocatalytic hydrogen production.A key step towards the structure design of high-performance catalysts for hydrogen evolution reaction(HER)relies on the in situ identification of the catalytic active sites in the process of HER,which is of great *** this review,we summarize the recent advances on the in situ investigation of the active sites on low dimensional catalysts for *** highlight the characterization techniques used for this purpose,including scanning electrochemical microscopy(SECM),scanning electrochemical cell microscopy(SECCM),electrochemical scanning tunneling microscopy(EC-STM),in situ liquid phase transmission electron microscopy(LP-TEM),and in situ spectroscopic *** conclude with an overview of the main technical limitations for the current approaches and give an outlook to future opportunities in this emerging field.

关键词： in situ hydrogen evolution reaction active sites electrocatalyst

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in situ atomic-scale observation of monolayer graphene growth from SiC

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Nano Research 2018年第5期11卷 2809-2820页

作者： Kaihao Yu Wen Zhao Xing Wu Jianing Zhuang Xiaohui Hu Qiubo Zhang Jun Sun Tao Xu Yang Chai Feng Ding Litao Sun SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education School of Electronic Science and Engineering Southeast University Nanjing 210096 China Center for Multidimensional Carbon Materials Institute for Basic Science Ulsan 689-798 Republic of Korea School of Materials Science and Engineering Ulsan National Institute of Science and Technology Ulsan 689-798 Republic of Korea Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong 999077 China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering East China Normal University Shanghai 200241 China College of Materials Science and Engineering Nanjing Tech University Nanjing 210009 China Center for Advanced Carbon Materials Southeast University and Jiangnan Graphene Research Institute Changzhou 213100 China Center for Advanced Materials and Manufacture Joint Research Institute of Southeast University and Monash University Suzhou 215123 China Department of Applied Physics The Hang Kong Polytechnic University Hang Kong 999077 China

Because of its high compatibility with conventional microfabrication processing technology, epitaxial graphene （EG） grown on SiC shows exceptional promise for graphene-based electronics. However, to date, a detailed understanding of the transformation from three-layer SiC to monolayer graphene is still lacking. Here, we demonstrate the direct atomic-scale observation of EG growth on a SiC （11^-00） surface at 1,000℃ by in situ transmission electron microscopy in combination with ab initio molecular dynamics （AIMD） simulations. Our detailed analysis of the growth dynamics of monolayer graphene reveals that three SiC （11^-00） layers decompose successively to form one graphene layer. Sublimation of the first layer causes the formation of carbon clusters containing short chains and hexagonal rings, which can be considered as the nuclei for graphene growth. Decomposition of the second layer results in the appearance of new chains connecting to the as-formed clusters and the formation of a network with large pores. Finally, the carbon atoms released from the third layer lead to the disappearance of the chains and large pores in the network, resulting in a whole graphene layer. Our study presents a clear picture of the epitaxial growth of the monolayer graphene from SiC and provides valuable information for future developments in SiC-derived EG technology.

关键词： graphene epitaxial growth in situ transmissionelectron microscopy

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in situ atomic-scale observation of dislocation behaviors in twin-structured Pt nanocrystals

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Science China(Technological Sciences) 2021年第3期64卷 599-604页

作者： GUO YiZhong SUN Tao FU LiBo HAO LongHu HUANG Ming WEI RuJian LUO JunFeng HE Xin WANG XingQuan XIONG XiaoDong WANG LiHua HAN XiaoDong Beijing Key Lab of Microstructure and Property of Advanced Materials Institute of Microstructure and Properties of Advanced MaterialsBeijing University of TechnologyBeijing 100124China Grikin Advanced Materials CO. LTD.Beijing 102200China

The deformation mechanisms of twin-structured metallic materials have attracted great *** previous theoretical predictions have suggested that the repulsive force of the twin boundary(TB)can significantly affect the deformation of twinstructured metals,it remains unclear whether this prediction applies to experimental *** this paper,the atomic-scaled deformation process of twin-structured Pt nanocrystals was in situ observed using our home-made device in a high-resolution transmission electron *** have shown that the plastic deformation of the twin-structured Pt nanocrystals was governed by full dislocation generation as well as Lomer dislocation(LD)lock formation and *** LD locks were destructed,these full dislocations tended to move towards the surface of the *** findings revealed that due to the ultra-high repulsive force of TB on dislocation,there was no dislocation-TB reaction during the *** findings can enrich our understanding of the dislocation behaviors of twin-structured nanocrystals.

关键词： deformation mechanism repulsive force twin boundary dislocations in situ

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in situ observation of electrochemical Ostwald ripening during sodium deposition

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Nano Research 2022年第3期15卷 2650-2654页

作者： Lin Geng Qiunan Liu Jingzhao Chen Peng Jia Hongjun Ye Jitong Yan Liqiang Zhang Yongfu Tang Jianyu Huang Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105China Hebei Key Laboratory of Applied Chemistry College of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China

Sodium(Na)metal batteries(SMBs)using Na anode are potential“beyond lithium”electrochemical technology for future energy storage ***,uncontrollable Na dendrite growth has plagued the application of *** Na deposition mechanisms,particularly the early stage of Na deposition kinetics,is critical to enable the *** this context,we conducted in situ observations of the early stage of electrochemical Na *** revealed an important electrochemical Ostwald ripening(EOR)phenomenon which dictated the early stage of Na ***,small Na nanocrystals were nucleated randomly,which then *** growth,smaller Na nanocrystals were contained by bigger ones via *** observed two types of EOR with one involving only electrochemical reaction driven by electrochemical potential difference between bigger and smaller nanocrystals;while the other being dominated by mass transport governed by surface energy *** results provide new understanding to the Na deposition mechanism,which may be useful for the development of SMB for energy storage applications.

关键词： in situ Na deposition electrochemical Ostwald ripening(EOR) Na nanocrystals

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In-situ SEM Observation of Monotonic and Cyclic Deformed Structure in Ti-2A1-2.5Zr Alloy

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Journal of Materials Science & Technology 2001年第1期17卷 37-38页

作者： Zhentao YU Lian ZHOU Haichen GU Ju DENG Northwest institute for Nonferrous Metal Research P.O.Box 51Xi’an 710016China Materials Science and Engineering College Xi’an Jiaotong UniversityXi’an 710049China

The SEM observation in situ of monotonic and cyclic deformed structure in Ti-ZA1-2.5Zr alloy was performed. The regularity of slippage, crack nucleation, propagation and the typical dislocation configuration were also investigated. The twin and twist play an important role in maintaining homogeneous deformation in the final plastic deformation stage.

关键词： plastic deformation in situ

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in situ TEM/SEM electronic/mechanical characterization of nano material with MEMS chip

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Journal of Semiconductors 2014年第8期35卷 1-9页

作者：王跃林李铁张啸曾鸿江金钦华 Science and Technology on Micro-System Laboratory Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences

Our investigation of in situ observations on electronic and mechanical properties of nano materials using a scanning electron microscope （SEM） and a transmission electron microscope （TEM） with the help of tradi- tional micro-electro-mechanical system （MEMS） technology has been reviewed. Thanks to the stability, continuity and controllability of the loading force from the electrostatic actuator and the sensitivity of the sensor beam, a MEMS tensile testing chip for accurate tensile testing in the nano scale is obtained. Based on the MEMS chips, the scale effect of Young＇s modulus in silicon has been studied and confirmed directly in a tensile experiment using a transmission electron microscope. Employing the nanomanipulation technology and FIB technology, Cu and SiC nanowires have been integrated into the tensile testing device and their mechanical, electronic properties under different stress have been achieved, simultaneously. All these will aid in better understanding the nano effects and contribute to the designation and application in nano devices.

关键词： MEMS nanoscale tensile in situ TEM/SEM

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