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Growth of Ag nanocrystals on multiwalled carbon nanotubes and Ag-carbon nanotube interaction

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Science China(Technological Sciences) 2009年第11期52卷 3215-3218页

作者： WANG ZhenXia LI XinNian REN CuiLan yong zhenzhong ZHU JianKang LUO WenYun FANG XiaoMing Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Applied Radiation Institute Shanghai UniversityShanghai 201800China

The experimental investigations on the interaction between Ag-nanocrystal particles (Ag-NCPs) and carbon nanotubes (CNTs) in Ag-nanocrystal particles/carbon nanotubes (Ag-NCPs/CNTs) hybrid structures were reported. The growth of Ag-NCPs on multiwalled carbon nanotubes (MWCNTs) was carried out by thermal evaporation deposition. High-resolution transmission electron microscopy and X-ray diffraction analyses revealed that Ag-NCPs had the crystal lattice feature of face-centered cube (fcc). The growth of Ag-NCPs on MWCNTs induced the cross-section deformation of MWCNT. The experimental results also showed that the synthesized Ag-NCPs/CNTs hybrid structure appeared as quasi-one dimensional nanowires containing the Ag-NCP/CNT hetero-junction. There was local cross-section deformation on MWCNTs at the interface of hetero-junction. These results involve the important topic about fundamental and practical studies for structure of MNCPs on CNTs and also find clues to further research of Ag nanocrystal growing on MWCNTs and related Ag-CNT interaction.

关键词： metal nanocrystal particles/carbon nanotubes hybrid structure Ag-nanocrystal particle Ag-NCP/CNT hetero-junction

Hollow Gradient-Structured Iron-Anchored Carbon Nanospheres for Enhanced Electromagnetic Wave Absorption

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Nano-Micro Letters 2023年第1期15卷 144-160页

作者： Cao Wu Jing Wang Xiaohang Zhang Lixing Kang Xun Cao yongyi Zhang Yutao Niu Yingying Yu Huili Fu Zongjie Shen Kunjie Wu zhenzhong yong Jingyun Zou Bin Wang Zhou Chen Zhengpeng Yang Qingwen Li Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuPeople’s Republic of China School of Science Nanchang Institute of TechnologyNanchang 330099JiangxiPeople’s Republic of China Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Jiangxi Institute of NanotechnologyNanchang 330200JiangxiPeople’s Republic of China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiPeople’s Republic of China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009People’s Republic of China School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211800People’s Republic of China Henan Key Laboratory of Materials On Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454003People’s Republic of China College of Safety Science and Engineering Xi’an University of Science and TechnologyXi’an 710054People’s Republic of China

In the present paper,a microwave absorber with nanoscale gradient structure was proposed for enhancing the electromagnetic absorption *** inorganic-organic competitive coating strategy was employed,which can effectively adjust the thermodynamic and kinetic reactions of iron ions during the solvothermal *** a result,Fe nanoparticles can be gradually decreased from the inner side to the surface across the hollow carbon *** results reveal that it offers an outstanding reflection loss value in combination with broadband wave absorption and flexible adjustment ability,which is superior to other relative graded distribution structures and satisfied with the requirements of lightweight *** addition,this work elucidates the intrinsic microwave regulation mechanism of the multiscale hybrid electromagnetic wave *** excellent impedance matching and moderate dielectric parameters are exhibited to be the dominative factors for the promotion of microwave absorption performance of the optimized *** strategy to prepare gradient-distributed microwave absorbing materials initiates a new way for designing and fabricating wave absorber with excellent impedance matching property in practical applications.

关键词： Gradient structures Carbon nanospheres Electromagnetic wave absorption Impedance matching

Carbon nanotube fibers with excellent mechanical and electrical properties by structural realigning and densification

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Nano Research 2023年第11期16卷 12762-12771页

作者： Kunjie Wu Bin Wang Yutao Niu Wenjing Wang Cao Wu Tao Zhou Li Chen Xianghe Zhan Ziyao Wan Shan Wang Zhengpeng Yang Yichi Zhang Liwen Zhang yongyi Zhang zhenzhong yong Muqiang Jian Qingwen Li Key Laboratory of Multifunctional Nanomaterials and Smart Systems Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Division of Nanomaterials and Jiangxi Key Lab of Carbonene Materials Jiangxi Institute of NanotechnologyNanchang 330200China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Henan Key Laboratory of Materials on Deep-Earth Engineering School of Materials Science and EngineeringHenan Polytechnic UniversityJiaozuo 454003China Beijing Graphene Institute(BGI) Beijing 100095China

Floating catalysis chemical vapor deposition(FCCVD)direct spinning process is an attractive method for fabrication of carbon nanotube fibers(CNTFs).However,the intrinsic structural defects,such as entanglement of the constituent carbon nanotubes(CNTs)and inter-tube gaps within the FCCVD CNTFs,hinder the enhancement of mechanical/electrical properties and the realization of practical applications of ***,achieving a comprehensive reassembly of CNTFs with both high alignment and dense packing is particularly ***,an efficient reinforcing strategy for FCCVD CNTFs was developed,involving chlorosulfonic acid-assisted wet stretching for CNT realigning and mechanical rolling for *** reveal the intrinsic relationship between the microstructure and the mechanical/electrical properties of CNTFs,the microstructure evolution of the CNTFs was characterized by cross-sectional scanning electron microscopy(SEM),wide angle X-ray scattering(WAXS),polarized Raman spectroscopy and Brunauer–Emmett–Teller(BET)*** results demonstrate that this strategy can improve the CNT alignment and eliminate the inter-tube voids in the CNTFs,which will lead to the decrease of mean distance between CNTs and increase of inter-tube contact area,resulting in the enhanced inter-tube van der Waals *** microstructural evolutions are beneficial to the load transfer and electron transport between CNTs,and are the main cause of the significant enhancement of mechanical and electrical properties of the ***,the tensile strength,elastic modulus and electrical conductivity of the high-performance CNTFs are 7.67 GPa,230 GPa and 4.36×10^(6)S/m,*** paves the way for further applications of CNTFs in high-end functional composites.

关键词： carbon nanotube fibers mechanical property electrical property alignment packing density

Enhanced Thermal Conductivity of Carbon Nanotube Arrays by Carbonizing Impregnated Phenolic Resins

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Materials Sciences and Applications 2013年第8期4卷 453-457页

作者： Dongmei Hu Hongyuan Chen zhenzhong yong Minghai Chen Xiaohua Zhang Qingwen Li Zhen Fan Zhihai Feng Key Laboratory of Nano-Devices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou China State Key Laboratory of Powder Metallurgy Central South University Changsha China National Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing China

A carbonization method is reported to improve the thermal conductivity of carbon nanotube (CNT) arrays. After being impregnated with phenolic resins, CNT arrays were carbonized at a temperature up to 1400°C. As a result, pyrolytic carbon was formed and connected non-neighboring CNTs. The pyrolysis improved the room temperature conductivity from below 2 W/m·K up to 11.8 and 14.6 W/m·K with carbonization at 800°C and 1400°C, respectively. Besides the light mass density of 1.1 g/cm3, the C/C composites demonstrated high thermal stability and a higher conductivity up to 21.4 W/m·K when working at 500°C.

关键词： Carbon Nanotube Phenolic Resin Pyrolysis Thermal Conductivity

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碳纳米管纤维的连续制备及高性能化

物理化学学报 2022年第9期38卷 74-98页

作者：吴昆杰张永毅勇振中李清文中国科学院苏州纳米技术与纳米仿生研究所先进材料部江苏苏州215123 中国科学院苏州纳米技术与纳米仿生研究所南昌研究院纳米材料部南昌330200 中国科学技术大学纳米技术与纳米仿生学院合肥230026

碳纳米管纤维是一种碳纳米管的宏观聚集体,是由碳纳米管及管束组装而成的连续纱线,具有高强、高韧、高导电等特性,在结构功能一体化复合材料、纤维状能源器件、人工肌肉以及轻质导电线缆等领域具有非常广泛的应用前景。经过近二十年的发... 详细信息

碳纳米管纤维是一种碳纳米管的宏观聚集体,是由碳纳米管及管束组装而成的连续纱线,具有高强、高韧、高导电等特性,在结构功能一体化复合材料、纤维状能源器件、人工肌肉以及轻质导电线缆等领域具有非常广泛的应用前景。经过近二十年的发展,碳纳米管纤维材料在连续制备技术、高性能化以及应用探索等方面相继取得了突破性的研究进展。本文总结了碳纳米管纤维材料的发展历程,对比介绍了碳纳米管纤维的不同连续制备与组装技术,重点讨论了碳纳米管纤维结构与性能之间的关联规律,并对目前碳纳米管纤维的高性能化方法进行了综述。在此基础上,对碳纳米管纤维材料的发展思路以及未来的应用方向进行了展望。

关键词：碳纳米管纤维连续制备力学性能增强电学性能增强

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超长碳纳米管阵列的制备与应用

材料导报 2011年第1期25卷 53-57页

作者：徐耿勇振中李清文中国科学院苏州纳米技术与纳米仿生研究所苏州215123 中国科学院研究生院北京100049

超长碳纳米管阵列通常定义为长度超过1mm的碳管阵列,在新型结构、电子等功能复合材料研发方面具有潜在优势。近期在超长碳纳米管制备和生长机理方面汇集了大量的研究工作,研究表明催化剂的活性和寿命是影响超长碳纳米管阵列生长的决定... 详细信息

超长碳纳米管阵列通常定义为长度超过1mm的碳管阵列,在新型结构、电子等功能复合材料研发方面具有潜在优势。近期在超长碳纳米管制备和生长机理方面汇集了大量的研究工作,研究表明催化剂的活性和寿命是影响超长碳纳米管阵列生长的决定因素。从催化剂结构、生长条件控制、碳源的选择以及其他因素等方面综述了其对催化剂活性和寿命的影响,以及对超长碳纳米管阵列生长的影响,展望了超长阵列的潜在应用前景。

关键词：碳纳米管阵列超长催化剂化学气相沉积

Wheat powdery mildew resistance gene Pm64 derived from wild emmer (Triticum turgidum ***) is tightly linked in repulsion with stripe rust resistance gene Yr5

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The Crop Journal 2019年第6期7卷 761-770页

作者： Deyun Zhang Keyu Zhu Lingli Dong yong Liang Genqiao Li Tilin Fang Guanghao Guo Qiuhong Wu Jingzhong Xie yongxing Chen Ping Lu Miaomiao Li Huaizhi Zhang zhenzhong Wang Yan Zhang Qixin Sun Zhiyong Liu College of Agronomy and Biotechnology China Agricultural UniversityBeijing 100193China State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biologythe Innovative Academy of Seed DesignChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Plant Soil Sciences Oklahoma State UniversityStillwaterOK 74078USA China Rural Technology Development Center Beijing 100045China

Stripe rust and powdery mildew are both devastating diseases for durum and common *** of genes conferring resistance to one or more diseases in a single cultivar is an important breeding approach to provide broader spectra of resistances in wheat improvement. A new powdery mildew resistance gene originating from wild emmer(Triticum turgidum ***) backcrossed into common wheat(T. aestivum) line WE35 was identified. It conferred an intermediate level of resistance to Blumeria graminis f. sp. tritici isolate E09 at the seedling stage and a high level of resistance at the adult plant stage. Genetic analysis showed that the powdery mildew resistance in WE35 was controlled by a dominant gene designated Pm64. Bulked segregant analysis(BSA) and molecular mapping indicated that Pm64 was located in chromosome bin 2 BL4-0.50–0.89. Polymorphic markers were developed from the corresponding genomic regions of Chinese Spring wheat and wild emmer accession Zavitan to delimit Pm64 to a 0.55 cM genetic interval between markers WGGBH1364 and WGGBH612, corresponding to a 15 Mb genomic region on Chinese Spring and Zavitan 2 BL, respectively. The genetic linkage map of Pm64 is critical for fine mapping and cloning. Pm64 was completely linked in repulsion with stripe rust resistance gene Yr5. Analysis of a larger segregating population might identify a recombinant line with both genes as a valuable resource in breeding for resistance to powdery mildew and stripe rust.

关键词： Blumeria graminis Genetic linkage map Yellow rust Triticum aestivum Triticum dicoccoides

Sequencing and comparative analyses of Aegilops tauschii chromosome arm 3DS reveal rapid evolution of Triticeae genomes

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Journal of Genetics and Genomics 2017年第1期44卷 51-61页

作者： Jingzhong Xie Naxin Huo Shenghui Zhou Yi Wang Guanghao Guo Karin R.Deal Shuhong Ouyang yong Liang zhenzhong Wang Lichan Xiao Tingting Zhu Tiezhu Hu Vijay Tiwari Jianwei Zhang Hongxia Li Zhongfu Ni Yingyin Yao Huiru Peng Shengli Zhang Olin D.Anderson Patrick E.McGuire Jan Dvorak Ming-Cheng Luo Zhiyong Liu yong Q.Gu Qixin Sun State Key Laboratory for Agrobiotechnology China Agricultural UniversityBeijing 100193China USDA-ARS West Regional Research Center AlbanyCA 94770USA Department of Plant Sciences University of California at DavisDavisCA 95616USA Department of Plant Pathology Kansas State UniversityManhattanKS 66506USA Arizona Genomics Institute School of Plant ScienceUniversity of ArizonaTucsonAZ 85721USA

Bread wheat （Triticum aestivum, AABBDD） is an allohexaploid species derived from two rounds of interspecific hybridizations. A high-quality genome sequence assembly of diploid Aegilops tauschii, the donor of the wheat D genome, will provide a useful platform to study polyploid wheat evolution. A combined approach of BAC pooling and next-generation sequencing technology was employed to sequence the minimum tiling path （MTP） of 3176 BAC clones from the short arm ofAe. tauschii chromosome 3 （At3DS）. The final assembly of 135 super-scaffolds with an N50 of 4.2 Mb was used to build a 247-Mb pseudomolecule with a total of 2222 predicted protein-coding genes. Compared with the orthologous regions of rice, Brachypodium, and sorghum, At3DS contains 38.67% more genes. In comparison to At3DS, the short arm sequence of wheat chromosome 3B （Ta3BS） is 95-Mb large in size, which is primarily due to the expansion of the non-centromeric region, suggesting that transposable element （TE） bursts in Ta3B likely occurred there. Also, the size increase is accompanied by a proportional increase in gene number in Ta3BS. We found that in the sequence of short arm of wheat chromosome 3D （Ta3DS）, there was only less than 0.27% gene loss compared to At3DS. Our study reveals divergent evolution of grass genomes and provides new insights into sequence changes in the polyploid wheat genome.

关键词： Aegilops tauschii Genome sequencing Sequence assembly Comparative genomics Grass evolution

高效宽负荷率超超临界机组关键技术研发与工程方案

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动力工程学报 2017年第3期37卷 173-178页

作者：张晓鲁张勇李振中国家电力投资集团公司北京100033 国家电投集团河南电力有限公司郑州450016 辽宁省燃烧工程技术中心沈阳110034

阐述了我国1 000 MW级和600 MW级超超临界机组的运行状况.从机组设计和运行2个方面详细分析了超超临界机组在变负荷条件下效率下降的原因,重点分析了机组负荷对锅炉、汽轮机和主要辅机效率的影响.基于变负荷条件下主辅机效率低的成因,... 详细信息

阐述了我国1 000 MW级和600 MW级超超临界机组的运行状况.从机组设计和运行2个方面详细分析了超超临界机组在变负荷条件下效率下降的原因,重点分析了机组负荷对锅炉、汽轮机和主要辅机效率的影响.基于变负荷条件下主辅机效率低的成因,进行高效宽负荷率超超临界机组的关键技术研发.在此基础上提出1 000MW高效宽负荷率超超临界机组工程方案,并进行了该高效宽负荷率机组的对比分析.

关键词：超超临界机组高效宽负荷关键技术工程方案