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Preparation of super-aligned carbon nanotube-reinforced nickel-matrix laminar composites with excellent mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2019年第1期26卷 133-141页

作者： Ze-cheng Hou Lun-qiao Xiong Yuan-feng liu lin Zhu wen-zhen li School of Materials Science and Engineering Tsinghua University Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University

A homogeneous and compact super-aligned carbon nanotube(SACNT)-reinforced nickel-matrix composite was successfully prepared by electrodeposition. The mechanical properties of the laminar SACNT/Ni composites were substantially improved compared with those of pure nickel. With increasing content of SACNTs, the tensile strength of the composite increased and the elongation decreased because of the high-strength SACNTs bearing part of an applied load and the fine-grained strengthening mechanism. The nanohardness of the SACNT/Ni composites was improved from 3.92 GPa(pure nickel) to 4.62 GPa(Ni-4 vol%SACNTs). The uniform distribution of SACNTs in the composites and strong interfacial bonding between the SACNTs and the nickel matrix resulted in an improvement of the mechanical properties of the SACNT/Ni composites. The introduced SACNTs refined the nickel grains, increased the amount of crystal twins, and changed the preferred orientation of grain growth.

关键词： nickel-matrix laminar composite super-aligned carbon nanotube electrodeposition mechanical properties

Supramolecular Radical Switches Regulated by Host-Guest Chemistry

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Chinese Journal of Chemistry 2022年第21期40卷 2568-2574页

作者： Yu-Yuan Ye Zi-Xin Wang Shi-Yuan Xu Xiao-Wei lin Jie Luo wen-zhen li Xiao-Qiang Wang Schoolof Chemistry and Chemical Engineering Wuhan Universityof Science and TechnologyWuhanHubei 430081China

Water-soluble thermal initiators are important radical sources to be applied in various ***,the uncontrolled radical generation from the high sensitivity of initiators may cause disadvantages in the ***,we present a series of supramolecular radical switches regulated by the host-guest chemistry between initiators and cucurbit[8]uril(CB[8]).Thermal initiators(VA-044,VA-056,VA-057)can be spontaneously encapsulated into the cavity of CB[8]to“turn off”their radical-generation *** activity will instantaneously“turn on”in the presence of other competitors such as 1-adamantylamine(ADA).Further,we demonstrated the free radical polymerization of N-isopropylacrylamide using initiators,inhibiting its activity by binding with CB[8]and initiating reaction by adding *** novel supramolecular radical switches provide a facile strategy to control the generation of free radicals in a“plug-and-play”manner,which may arouse research interests in polymerization,catalysis,and the biomedical field.

关键词： Supramolecular chemistry Cucurbituril Azo compound Radicals Radical switch

Optimization of SO_3 Content in Blended Cementitious Materials

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Journal of Wuhan University of Technology(Materials Science) 2003年第3期18卷 89-93页

作者：陈美祝 State Key Laboratory of Water Resource and Hydropower Engineering Sciences Wuhan University

Experimental investigation was conducted on the effects of gypsum types and SO 3 content on the fluidity and strengths of different cementitious *** experimental results show that influences of gypsum in various cementitious materials are *** cementitious materials blended with various proportions of slag fly ash and 5% gypsum content,influences of gypsum and calcined gypsum on the fluidity and flexural/compressive strength are *** is revealed that 'combination effect' and 'synergistic effect' of slag and fly ash play an important role during *** cementitious materials with 45% clinkers,30%slag,20%fly ash and 5%limestone,the optimized SO 3 contents in gypsum and calcined gypsum are 3.13% and 3.51% respectively and the optimized gypsum content is 6.5%.While both of them are blended,the optimum ratio of gypsum to calcined gypsum is 40%∶60%(total gypsum content 6.5%),correspondingly the optimum ratio of SO 3 is 19.3%∶32.4%.

关键词： gypsum calcined gypsum slag fly ash cementitious material

Effects of ply-orientation on microstructure and properties of super-aligned carbon nanotube reinforced copper laminar composites

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Transactions of Nonferrous Metals Society of China 2017年第8期27卷 1747-1758页

作者： Jing SHUAI Lun-qiao XIONG lin ZHU wen-zhen li School of Materials Science and Engineering Tsinghua University Beijing 100084 China Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing 100084 China

The super-aligned carbon nanotube(SACNT)films reinforced copper(Cu)laminar composites with different orientationsof CNT ply were fabricated by *** results show that the tensile strength and yield strength of cross-ply compositewith5.0%(volume fraction)of SACNT reach maximum of336.3MPa and246.0MPa respectively,increased by74.0%and124.5%compared with pure Cu prepared with the same ***,the electrical conductivities of all the prepared composites areover75%*** result of TEM analysis shows that the size of Cu grain and the thickness of twin lamellae can be reduced byadding SACNT,and the refining effect in cross-ply composites is more significant than that in unidirectional ply *** strength of the Cu/SACNT composites comes from not only the reinforcing effect of SACNT films but also the additionalstrengthening of the Cu grain refinement caused by CNT orientation.

关键词： copper laminar composite super-aligned carbon nanotubes reinforcement ply-orientation mechanical properties electrical properties microstructure

Local magnetic moment oscillation around an Anderson impurity on graphene

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 192-201页

作者： Shuai li zhen Ma Jin-Hua Gao School of Science Hebei University of Science and Technology School of Electronics and Information Zhengzhou University of Light Industry School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology

We theoretically investigate the spin resolved Friedel oscillation （FO） and quasiparticle interference （QPI） in graphene induced by an Anderson *** the impurity becomes magnetic,the resulted FO becomes spin dependent,which gives rise to a local magnetic moment oscillation with an envelop decaying as r-2in real space in the doping ***,at half filling,the electron density and local magnetic moment will not oscillate but decay as *** spin resolved FO has both sublattice and spin ***,the local magnetic moment decay at half filling only occurs at one sublattice of graphene,which is quite like the phenomenon observed in the STM experiment (***ález-Herrero et al.,Science 352,437 （2016）).We further give an analytic formula about such spin dependent FO based on the stationary phase ***,we study the interference of quasiparticles around the magnetic impurity by calculating the spin dependent Fourier-transformed local density of states （FT-LDOS）.Our work gives a comprehensive understanding about the local magnetic moment oscillation around an Anderson impurity on graphene.

关键词： Friedel oscillation local magnetic moment graphene Anderson impurity

煤层注液态CO_2压裂增透过程及裂隙扩展特征试验

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煤炭学报 2016年第11期41卷 2793-2799页

作者：文虎李珍宝王振平马砺郭英王旭西安科技大学西部矿井开采及灾害防治教育部重点实验室陕西西安710054 西安科技大学安全科学与工程学院陕西西安710054 兖矿集团有限公司山东邹城273515 兖州煤业股份有限公司南屯煤矿山东邹城273515

针对我国煤层＂高储低渗＂的赋存特征,基于液态CO_2黏度低、阻力小、酸化解堵及相变增压的特点,采用液态CO_2进行煤层压裂增透现场试验,研究煤层压裂过程裂隙扩展规律。结果表明：压裂过程流量随着压力的增长呈现出＂波动＂特性,钻孔周... 详细信息

针对我国煤层＂高储低渗＂的赋存特征,基于液态CO_2黏度低、阻力小、酸化解堵及相变增压的特点,采用液态CO_2进行煤层压裂增透现场试验,研究煤层压裂过程裂隙扩展规律。结果表明：压裂过程流量随着压力的增长呈现出＂波动＂特性,钻孔周围煤体受CO_2压力作用产生裂隙并向前延伸,压裂初期裂隙扩展速度较快,随后逐渐减小;压裂裂隙同时沿压裂孔轴向和径向扩展;压力及流量曲线在1.8,2.2 MPa处出现拐点,压裂过程分为3个阶段,各阶段煤体破坏形式依次为钻孔破碎区裂隙起裂—弱面扩展—微孔隙破坏。现场压裂试验结果表明压裂半径可达10~20 m,且与水力压裂相比在压裂安全性、时间和效果方面存在技术优势。

关键词：增透人工裂隙液态CO2 压裂半径扩展特征

Fabrication of superaligned carbon nanotubes reinforced copper matrix laminar composite by electrodeposition

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Transactions of Nonferrous Metals Society of China 2015年第9期25卷 2994-3001页

作者：靳宇朱琳薛卫东李文珍清华大学材料学院北京100084 清华大学清华-富士康纳米科技研究中心北京100084

A new kind of laminar metal matrix nanocomposite（MMC） was fabricated by an electrodeposition process with copper and superaligned carbon nanotubes film（SACNT film）.The SACNT film was put on a titanium plate and then a layer of copper was electrodeposited on *** repeating the above process,the laminar Cu/SACNT composite which contains dozens or hundreds of layers of copper and SACNT films was *** thickness of a single copper layer was controlled by adjusting the process parameter easily and the thinnest layer is less than 2 μ*** microscopic observation shows that the directional alignment structure of SACNT is retained in the composite *** mechanical and electrical properties testing results show that the tensile and yield strengths of composites are improved obviously compared with those of pure copper,and the high conductivity is *** technology is a potential method to make applicable MMC which characterizes high volume fraction and directional alignment of carbon nanotubes.

关键词： copper matrix laminar composite superaligned carbon nanotubes electrodeposition

Establishment of multiplexed,microsphere-based flow cytometric assay for multiple human tumor markers

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Acta Pharmacologica Sinica 2007年第12期28卷 2011-2018页

作者： Kai SUN,Qian WANG~2,Xiao-hui HUANG,Mao-chuan zhen,wen li,Long-juan ZHANGDepartment of Hepatobiliary Surgery,the First Affiliated Hospital of Sun Yat-Sen University,Guangzhou 510080,China Department of Hepatobiliary Surgery the First Affiliated Hospital of Sun Yat-Sen UniversityGuangzhou 510080China

Aim:The multiplexed,microsphere-based flow cytometric assay (MFCA) for mul-tiple human tumor markers was established for the early screening and detectionof suspected cancer ***:Covalent coupling of capture antibodiesdirected against their respective tumor markers to fluorescent microspheres wasperformed by following the protocols recommended by a commercial corporationwith some *** coupling efficiency and cross-reactivity were iden-tified by the Luminex 100 system and associated *** standard curvewas constructed by using serial dilution of recombinant tumor marker standardsand was validated by comparison with EliSA for quantifying the tumor markers inserum ***:The identifications revealed that the coupling proce-dures were successful without non-specific cross-reactivity and the standardcurve was highly ***,it was necessary to ensure the quality con-trol of the coupling process since slight variations in the coupling procedurescould profoundly affect the density of capture reagents coupled to themicrospheres and consequently adversely affect the assay *** additionto its multi-analyte capability,the MFCA system had definite advantages,such ashigher reproducibility,greater dynamic range of measurement,and considerablyless preparation time and labor over the conventional"gold standard",which wasthe ***:The successful establishment of the MFCA system forthe simultaneous detection of multiple tumor markers will provide the foundationfor the further study of clinical applications.

关键词： fluorescent microsphere microsphere-based flow cytometric assay tumor marker

沉积温度对等离子增强化学气相沉积法制备的SiN_x：H薄膜特性的影响

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物理化学学报 2011年第6期27卷 1531-1536页

作者：闻震利曹晓宁周春兰赵雷李海玲王文静中国科学院电工研究所太阳能热利用及光伏系统重点实验室北京100190

利用Centrotherm公司生产的管式等离子增强化学气相沉积(PECVD)设备在p型抛光硅片表面沉积SiNx:H薄膜,研究沉积温度对SiNx:H薄膜的组成及光学特性、结构及表面钝化特性的影响.然后采用工业化的单晶硅太阳电池制作设备和工艺制作太阳电池... 详细信息

利用Centrotherm公司生产的管式等离子增强化学气相沉积(PECVD)设备在p型抛光硅片表面沉积SiNx:H薄膜,研究沉积温度对SiNx:H薄膜的组成及光学特性、结构及表面钝化特性的影响.然后采用工业化的单晶硅太阳电池制作设备和工艺制作太阳电池,研究不同温度制备的薄膜对电池电性能的影响.测试结果表明:SiNx:H薄膜的折射率随着沉积温度的升高而变大,分布在1.926-2.231之间,这表明Si/N摩尔比随着沉积温度的增加而增加;当沉积温度增加时,薄膜中Si-H键和N-H键浓度呈现减小趋势,而Si-N键浓度逐渐升高,薄膜致密度增加;随着沉积温度的升高,SiNx:H薄膜中的氢析出导致了钝化硅片的有效少子寿命先升高后降低,并且有效少子寿命出现明显的时间衰减特性.当沉积温度为450°C时,薄膜具有最优的减反射和表面钝化效果.采用不同温度PECVD制备的5组电池的电性能测试结果也验证了这一结果.

关键词： SiNx:H薄膜沉积温度结构特性钝化太阳电池效率