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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 performance.The inorganic-organic competitive coating strategy was employed,which can effectively adjust the thermodynamic and kinetic reactions of iron ions during the solvothermal process.As a result,Fe nanoparticles can be gradually decreased from the inner side to the surface across the hollow carbon shell.The 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 equipment.In addition,this work elucidates the intrinsic microwave regulation mechanism of the multiscale hybrid electromagnetic wave absorber.The excellent impedance matching and moderate dielectric parameters are exhibited to be the dominative factors for the promotion of microwave absorption performance of the optimized materials.This 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 CNTFs.Therefore,achieving a comprehensive reassembly of CNTFs with both high alignment and dense packing is particularly crucial.Herein,an efficient reinforcing strategy for FCCVD CNTFs was developed,involving chlorosulfonic acid-assisted wet stretching for CNT realigning and mechanical rolling for densification.To 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)analysis.The 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 interactions.These 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 CNTFs.Specifically,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,respectively.It 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

Solution-processable precursor route for fabricating ultrathin silica film for high performance and low voltage organic transistors

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Chinese Chemical Letters 2017年第11期28卷 2143-2146页

作者： Shujing Guo Zhongwu Wang Zeyang Xu Shuguang Wang kunjie wu Shufeng Chen Zongbo Zhang Caihong Xu Wenfeng Qiu Liqiang Li Inner Mongolia University of College of Chemistry and Chemical Engineering Hohhot 010021 China Advanced Nano-materials Division Key Laboratory of Nano-Devices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China Laboratory of High-Tech Materials Institute of ChemistryChinese Academy of Sciences Beijing 100190 China

Silica is one of the most commonly used materials for dielectric layer in organic thin-film transistors due to its excellent stability, excellent electrical properties, mature preparation process, and good compatibility with organic semiconductors. However, most of conventional preparation methods for silica film are generally performed at high temperature and/or high vacuum. In this paper, we introduce a simple solution spin-coating method to fabricate silica thin film from precursor route, which possesses a low leakage current, high capacitance, and low surface roughness. The silica thin film can be produced in the condition of low temperature and atmospheric environment. To meet various demands, the thickness of film can be adjusted by means of preparation conditions such as the speed of spin-coating and the concentration of solution. The p-type and n-type organic field effect transistors fabricated by using this film as gate electrodes exhibit excellent electrical performance including low voltage and high performance. This method shows great potential for industrialization owing to its characteristic of low consumption and energy saving, time-saving and easy to operate.

关键词： Silica Spin coating Thin film Transistor

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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

信阳市克氏原螯虾对5种重金属的生物富集特征及其污染评价

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河南农业科学 2015年第9期44卷 118-121页

作者：吴坤杰信阳农林学院水产科学系/信阳市现代渔业生物工程技术研究中心河南信阳464000

为了探讨信阳市不同水域克氏原螯虾对重金属的生物富集规律及其污染现状，测定了信阳市污水沟、浉河下游、茶叶生产区、稻田、工业区和养殖池塘各水域克氏原螯虾中甲基汞、镉、铅、无机砷和铬的含量，分析了克氏原螯虾对5种重金属的富... 详细信息

为了探讨信阳市不同水域克氏原螯虾对重金属的生物富集规律及其污染现状，测定了信阳市污水沟、浉河下游、茶叶生产区、稻田、工业区和养殖池塘各水域克氏原螯虾中甲基汞、镉、铅、无机砷和铬的含量，分析了克氏原螯虾对5种重金属的富集特征，并根据单因子污染指数评价法对克氏原螯虾的品质进行质量安全评价。结果表明，污水沟克氏原螯虾镉、铅和甲基汞含量最高，分别达到0．42 mg／kg、0．32 mg／kg和0．41 mg／kg，与其他水域差异极显著；工业区克氏原螯虾铬含量最高为1．54 mg／kg，与其他水域差异极显著；茶叶生产区克氏原螯虾无机砷含量最高达到0．38 mg／kg，与其他水域差异极显著。信阳市克氏原螯虾肌肉、内脏和外壳之间的镉、铬和无机砷含量差异均不显著；肌肉和外壳铅的含量分别为0．29 mg／kg和0．35 mg／kg，差异显著；肌肉和外壳甲基汞的含量分别为0．19 mg／kg和0．29 mg／kg，差异显著。信阳市克氏原螯虾5种重金属单因子污染指数介于0．26～0．42，表明信阳市克氏原螯虾受到了5种重金属的轻度污染。

关键词：克氏原螯虾重金属质量安全评价生物富集

微沟槽织构设计对PDMS表面黏-滑摩擦学行为的影响

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摩擦学学报（中英文） 2024年第1期44卷 70-77页

作者：施文斌肖汉崔坤杰王涛时礼平吴玉国李蒙安徽工业大学机械工程学院安徽马鞍山243002 安徽工业大学芜湖技术创新研究院安徽芜湖241002

“黏-滑”现象是软材料表面摩擦学行为典型的特征,易诱发机械系统的振动与噪音等问题.本文中采用激光加工技术在PDMS(Polydimethylsiloxane,聚二甲基硅氧烷)表面加工了沟槽状织构阵列,研究不同参数织构设计对软材料表面“黏-滑”摩擦行... 详细信息

“黏-滑”现象是软材料表面摩擦学行为典型的特征,易诱发机械系统的振动与噪音等问题.本文中采用激光加工技术在PDMS(Polydimethylsiloxane,聚二甲基硅氧烷)表面加工了沟槽状织构阵列,研究不同参数织构设计对软材料表面“黏-滑”摩擦行为的影响.结果表明沟槽织构可以有效抑制软材料表面“黏-滑”行为,降低界面摩擦阻力,但沟槽的作用效能依赖于其倾斜角设计.此外,界面滑动速度和沟槽织构宽度也是影响表面摩擦学行为的主要因素.

关键词： “黏-滑”行为软材料摩擦学黏弹性表面织构

信阳市主要野生水产动物重金属含量分析及质量安全评价

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河北渔业 2016年第3期 14-17页

作者：吴坤杰信阳农林学院水产学院河南信阳464000 信阳市现代渔业生物工程技术研究中心河南信阳464000

测定了信阳市主要野生水产动物Cd、Cr、Pb、As和Hg的含量,并根据单因子污染指数评价法对信阳市主要野生水产动物的品质进行质量安全评价。结果表明,8种信阳市主要野生水产动物的所有样品中均检出Pb和Cr,但均未检出Cd和Hg。在鲫鱼、鲤鱼... 详细信息

测定了信阳市主要野生水产动物Cd、Cr、Pb、As和Hg的含量,并根据单因子污染指数评价法对信阳市主要野生水产动物的品质进行质量安全评价。结果表明,8种信阳市主要野生水产动物的所有样品中均检出Pb和Cr,但均未检出Cd和Hg。在鲫鱼、鲤鱼、青虾和克氏原螯虾中检出As,检出率分别为60%、65.5%、55%和50%。单因子污染指数评价法表明,8种信阳市主要野生水产动物均受到不同程度的Pb污染,鲤鱼和鲫鱼受到了轻度的As污染。

关键词：水产动物重金属质量安全评价

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碎石土填方场地嵌岩桩负摩阻力性状分析

铁道建筑 2024年第6期64卷 146-151页

作者：徐昆杰胡其巧赵宁雨伍洪均向阳京昆高速铁路西昆有限公司重庆400023 重庆交通大学山区桥梁及隧道工程国家重点实验室重庆400074 招商新智科技有限公司北京100073

以西南地区土石混合体为研究对象,通过单桩室内模型试验,研究了素填土和土石混合料地基中桩周土体沉降、桩土位移、桩身轴力、桩侧负摩阻力、中性点位置等。结果表明:土石混合料填土地基中桩周土体与桩身沉降较素填土地基中更小;在堆载... 详细信息

以西南地区土石混合体为研究对象,通过单桩室内模型试验,研究了素填土和土石混合料地基中桩周土体沉降、桩土位移、桩身轴力、桩侧负摩阻力、中性点位置等。结果表明:土石混合料填土地基中桩周土体与桩身沉降较素填土地基中更小;在堆载及加载作用下,中性点位置随着荷载等级提高而下移,且土石混合料地基的中性点位置高于素填土地基,其中性点位置距桩顶0.36 l~0.52(l l为有效桩长)内;桩身轴力在土石混合料和素填土中均随深度先增后减,但土石混合料填土地基中桩身轴力小于素填土地基。

关键词：土石混合料嵌岩桩模型试验负摩阻力中性点

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浅析食品微生物检验复验的相关问题

食品安全导刊 2022年第15期 1-3页

作者：毋堃杰夏天李亚楠任文鑫杨晓东西安市食品药品检验所国家药品重点实验室陕西西安710056

食品复验是针对抽检相对人对检验结果有异议时所采取的保障性措施,它是对初次检验结果的复查,其目的是为了减小对检验对象错判的风险,以降低抽检相对人的经济风险。本文对食品微生物复验方面存在的问题及其合理性展开分析和讨论。

关键词：复验复检食品检验微生物