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Electrospun CuFe_2O_4 nanotubes as anodes for high-performance lithium-ion batteries

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Journal of Energy Chemistry 2014年第3期23卷 301-307页

作者： Shengjie peng Linlin lia.Madhavi Srinivasan School of Materials Science and Engineering Nanyang Technological University TUM-CREATE Center for Electromobility Nanyang Technological University

Herein,we report on the synthesis and lithium storage properties of electrospun one-dimensional（1D） CuFe2O4 nanomaterials.1D CuFe2O4nanotubes and nanorods were fabricated by a single spinneret electrospinning method followed by thermal decomposition for removal of polymers from the precursor *** as-prepared CuFe2O4 nanotubes with wall thickness of 50 nm presented diameters of 150 nm and lengths up to several *** was found that phase separation between the electrospun composite materials occured during the electrospinning process,while the as-spun precursor nanofibers composed of polyacrylonitrile（PAN）,polyvinylpyrrolidone（PVP） and metal salts might possess a core-shell structure（PAN as the core and PVP/metal salts composite as the shell） and then transformed to a hollow structure after ***,as a demonstration of the functional properties of the 1D ***2O4 nanotubes and nanorods were investigated as anodes for lithium ion batteries（LIBs）.It was demonstrated that CuFe2O4 nanotubes not only delivered a high reversible capacity of 816 mAh·g-1 at a current density of 200 mA·g-1over 50 cycles,but also showed superior rate capability with respect to counterpart ***,the enhanced electrochemical performance can be attributed to its high specific surface areas as well as the unique hollow structure.

关键词： electrospinning ferrite salts one-dimensional structures nanotubes,lithium ion batteries

SOLUTION CRYSTALLIZATION BEHAVIOR OF LINEAR AND STAR-SHAPED POLY(ETHYLENE GLYCOL)-b-POLY(ε-CAPROLACTONE) BLOCK COPOLYMERS

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Chinese Journal of Polymer Science 2013年第12期31卷 1717-1724页

作者： Ting Yu Jian-qiang Zhang Ya lia.Su-dan Shen Wen-feng Wei peng Chen 王宗宝顾群 Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences School of Petrochemical Technology Lanzhou University of Technology Institute of Material Engineering Ningbo University of Technology

Lamellar crystals of diblock, triblock and four-arm poly（ethylene glycol）-b-poly（ε-caprolactone）（PEG-b-PCL） crystalline-crystalline copolymers were successfully obtained from their solution. Morphology and structure of lamellar crystals of crystalline-crystalline copotymers were investigated using tapping-mode atomic force microscopy （AFM） and selected area electron diffraction （SAED）. All of these samples showed the truncated-lozenge multilayer basal shapes with central screw dislocation or central stack, which were all obtained simultaneously from the oil bath. The diffraction pattern of PEG block lamellar crystal is attributed to the （120） diffracting planes and the pattern of PCL block lamellar crystal is attributed to the （1 I0） diffracting planes and （200） diffracting planes according to the SAED results. Four （110） crystal growth planes and two （200） crystal growth planes are discovered for the PCL blocks, but the （120） crystal growth planes of PEG blocks are hided in the figure of AFM. The crystalline structure of the four-arm copolymers （FA） is more disorder and confused than that of the diblock （DI） copolymer and the striated fold surface structures of lamellar crystals of four-arm copolymers （FA） are smoother than these of linear analogues, owing to the confused crystallization of blocks caused by the mutual restriction of blocks and the hindrance of the dendritic cores. In addition, the aspect ratio of FA is greater than that of the others. It is hypothesized that there are two reasons for the change of aspect ratios. First, the （200） diffracting planes of PCL crystals grew slowly compared to their （110） diffracting planes because of difference in the energy barrier. Secondly, edge dislocations on the （200） diffracting planes are also responsible for the variation of the aspect ratio. Consequently, the crystalline defects are augmented by the competing blocks crystallized simultaneously and the hindrance of the dendritic cores.

关键词： Lamellar crystal Topological structure PEG-b-PCL Edge dislocation Aspect ratio.

Insights into the nucleation,grain growth and phase transformation behaviours of sputtered metastableβ-W films

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Journal of Materials Science & Technology 2021年第31期90卷 66-75页

作者： Shuqun Chen Jinshu Wang Ronghai Wu Zheng Wang Yangzhong Li Yiwen Lu Wenyuan Zhou peng Hua Hongyi lia Key Laboratory of Advanced Functional Materials Education Ministry of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710129China High Performance Computing Department National Supercomputing Center in ShenzhenShenzhen 518055China China Ship Development and Design Center Wuhan 430074China

Metastable phase in tungsten film is of great interests in recent years due to its giant spin Hall effects,however,little information has been known on its nucleation,growth and phase *** this paper,a 900 nm-thick tungsten film with double-layer structure(α-W underlayer andβ-W above it)was produced on SiO_(2)/Si substrate by high vacuum magnetron sputtering at room *** structural properties ofβ-W were systemically investigated by X-ray diffraction,transmission electron microscopy,thermodynamic calculation,first-principle and phase-field *** is found that theβ-W nucleation is energetically favoured on the SiO_(2)surface compared to theα-W *** the film thickening proceeds,β-W[211]turns to be preferred direction of growth owing to the elastic strain energy minimization,which is verified by phase-field ***,theβ→αphase transformation takes place near the film-substrate interface while the rest of the film keeps theβ-W phase,leading to a doublelayer *** localized phase transition is induced by lower Gibbs free energy ofα-W phase at larger grain sizes,which can be confirmed by thermodynamic *** in-situ heating TEM analysis of the as-deposited film reveals that theβ→αphase transformation is fulfilled byα/βinterface propagation rather than local atomic *** findings offer valuable insights into the intrinsic properties of metastable phase in tungsten.

关键词： Metastable phases Tungsten Nucleation and growth Phase field modelling Phase transformation

The evaluation of tannic acidon human pyruvate kinase isoenzyme M2

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The evaluation of tannic acidon human pyruvate kinase isoenz...

中国生物化学与分子生物学会2016年全国学术会议

作者： peng Yanga Zhuoyu lia aInstitute of Biotechnology Key Laboratory of Chemical Biology and Molecular Engineering of National Ministry of Education Shanxi University

As a naturally occurring polyphenolic acid,tannic acid,which is mainly present in grape and green tea,has strong antioxidant and anticarcinogenic *** kinase isoenzyme M2(PKM2),as a key enzyme of aerobic glycolysis and malignant progression,plays an important regulatory role and is considered as the potential anticancer ***,the inhibition

关键词： tannic acid PKM2 Fluorescence spectroscopy enzyme inhibitors

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带执行器节点的无线传感器网络协议研究

华中科技大学学报（自然科学版） 2006年第12期34卷 13-15页

作者：汪秉文彭力彭容修华中科技大学控制科学与工程系湖北武汉430074 华中科技大学电子与信息工程系湖北武汉430074

对带执行器节点的无线传感器网络系统的结构和特点进行介绍和分析,比较了带执行器节点的网络系统与普通的网络系统之间的不同.根据充分利用执行器节点的供电和通信能力,减少传感器节点的能耗的设计思想,设计了一种可行网络通信协议和执... 详细信息

对带执行器节点的无线传感器网络系统的结构和特点进行介绍和分析,比较了带执行器节点的网络系统与普通的网络系统之间的不同.根据充分利用执行器节点的供电和通信能力,减少传感器节点的能耗的设计思想,设计了一种可行网络通信协议和执行器决策算法.然后利用无线传感器网络能量模型和网络通信模型对该协议进行能耗和网络响应时间分析.最后对本协议进行仿真分析,比较执行器节点存在和不存在两种网络的网络性能,结果说明利用系统中执行器节点的特性设计网络通信协议,可以有效地提高网络系统的事件响应时间和单事件能耗性能.

关键词：无线传感器网络执行器节点网络协议栈决策算法

Diffusion and catalyst efficiency in hierarchical zeolite catalysts

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National Science Review 2020年第11期7卷 1726-1742页

作者： peng peng Xiong-Hou Gao Zi-Feng Yan Svetlana Mintova State Key Laboratory of Heavy Oil Processing China University of Petroleum Laboratory of Catalysis and Spectrochemistry (LCS) Normandy University National Graduate School of Engineering of Caen (ENSICAEN)University of Caen (UNICAEN) French National Center for Scientific Research (CNRS) Petrochemical Research Institute China National Petroleum Company

The preparation of hierarchical zeolites with reduced diffusion limitation and enhanced catalyst efficiency has become a vital focus in the field of zeolites and porous materials chemistry within the past decades. This review will focus on the diffusion and catalyst efficiency of hierarchical zeolites and industrial catalysts. The benefits of diffusion and catalyst efficiency at two levels of hierarchies (zeolitic component level and industrial catalyst level) from a chemical reaction engineering point of view will be analysed. At zeolitic component level, three types of mesopores based on the strategies applied toward enhancing the catalyst effectiveness factor are presented:(i)‘functional mesopores’(raising effective diffusivity);(ii)‘auxilia.y mesopores’(decreasing diffusion length); and (iii)‘integrated mesopores’(a combination thereof). At industrial catalyst level, location and interconnectivity among the constitutive components are *** hierarchical pore interconnectivity in multi-component zeolite based industrial catalysts is exemplified by fluid catalytic cracking and bi-functional hydroisomerization catalysts. The rational design of industrial zeolite catalysts at both hierarchical zeolitic component and catalyst body levels can be fully comprehended using the advanced in situ and/or operando spectroscopic, microscopic and diffraction techniques.

关键词： diffusion effectiveness factor pore connectivity hierarchical zeolite industrial catalyst advanced characterization

Synthesis and cytotoxic activity of two platinum（Ⅱ） complexes with methyl hydrazinecarbodithioate derivatives of indolin-2-one

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Synthesis and cytotoxic activity of two platinum（Ⅱ） compl...

鄂尔多斯盆地东南部晚二叠世地球化学特征及古环境一一以韩城薛峰川剖面石千峰组为例

中国化学会第十三届全国有机合成化学学术研讨会

作者： Li You-Shan Ma lia.peng Bin Wan Chong-Qing Xu Xingzhi Cao Sheng-lia Department of Chemistry Capital Normal University Beijing Key Laboratory of DNA Damage Response College of Life ScienceCapital Normal University

Two new platinum（II） complexes 5 a and 5 b with methyl hydrazinecarbodithioate derivatives of indolin-2-one have been synthesized and characterized by single-crystal X-ray diffraction,NMR and *** activity of the two complexes and their ligands 4 a and 4 b against HCT-116,MCF-7 and MDA-MB-231 cell lines was determined by the MTS *** 5 a and 5 b were more cytotoxic against three cell lines than compounds 4 a and 4 b（IC50,1.89-5.60 versus 6.52-35.13 μM）.Moreover,treatment of HCT-116 cells with the complexes resulted in an obvious sub-G1 peak by cell cycle profile analysis,and an increase of cleaved PARP1 levels by immunoblotting *** cell imaging showed that nucleus shrinkage and condensation started to appear when MCF-7 cells were treated with 5 a for 8 *** spectrophotometric analysis revealed that the complexes physically associated with calf thymus *** together,our results indicated that the two complexes 5 a and 5 b bind to DNA with high affinity and exhibit cytotoxicity against cancer cells by inducing apoptosis.

关键词： Platinum(Ⅱ) complex hydrazinecarbodithioate cytotoxic activity apoptosis

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矿物岩石 2024年第3期44卷 181-191页

作者：张林林赵亮赵俊兴雷迅彭丽曹立山张永洁孙伟智徐潇彭帅杰成都理工大学沉积地质研究院四川成都610059 中国石油长庆油田分公司天然气评价项目部甘肃庆阳745099 中国石油长庆油田分公司第三采气厂内蒙古乌审旗500063

晚二叠世是全球气候变化的重要转折时期,鄂尔多斯盆地二叠世石千峰组为一套典型的陆相沉积,前人对该时期较连续的海相地层揭示的古气候研究较为成熟,而对同时期陆相地层的研究缺乏系统性,相关研究程度低,研究资料需要进一步完善。文章... 详细信息

晚二叠世是全球气候变化的重要转折时期,鄂尔多斯盆地二叠世石千峰组为一套典型的陆相沉积,前人对该时期较连续的海相地层揭示的古气候研究较为成熟,而对同时期陆相地层的研究缺乏系统性,相关研究程度低,研究资料需要进一步完善。文章通过盆地东南部薛峰川剖面石千峰组地质剖面的详细观察、测量及系统采样,开展了系统的岩石学和元素地球化学分析,分析了该时期沉积期的古气候、古盐度和古环境特征,揭示了其演化规律。结果表明:(1)样品化学蚀变指数CIA的变化范围为15.3578.28,大部分样品的CIA值变化范围在65~85之间,风化程度中等;碳同位素偏移明显,偏移幅度达3.47%,气候出现突变。总体为半湿润-半干旱气候,部分时期干旱程度增大;(2)通过碳氧同位素相关性分析和古盐度Z值和S值计算,表明了自下而上古盐度值总体上呈增加趋势,上部层段的Z值和S值分别为119.98%和31.36%,可达半咸水-咸水环境;(3)古氧化还原指标U/Th、Ni/Co、V/(V+Ni)比值的范围分别为0.15~1.00,1.35~2.43,0.73~0.88,沉积期整体处于强氧化沉积环境;(4)上段的钙质结核、粉砂质灰岩以及紫红色砂泥岩呈韵律层出现表明沉积环境向干旱演化。综合分析认为,盆地东南部晚二叠世地球化学元素变化剧烈,沉积相也变化大,表明该时期古气候、古环境发生重大变化,水体盐度变高,气候变得更为炎热干旱。

关键词：鄂尔多斯盆地晚二叠世石千峰组古盐度古气候古环境

Thin,soft,skin-integrated electronics for real-time and wireless detectionof uricacid in sweat

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International Journal of Smart and Nano Materials 2023年第4期14卷 406-419页

作者： Yue Hu Lan Wang Jian lia.Yawen Yang Guangyao Zhao Yiming Liu Xingcan Huang pengcheng Wu Binbin Zhang Yanli Jia Mengge Wu Shengxin Jia Qiang Zhang Guoqiang Xu Rui Shi Dengfeng Li Yingchun Li Zhengchun peng Xinge Yu Department of Biomedical Engineering City University of Hong KongHong KongP.R.China State Key Laboratory of Radio Frequency Heterogeneous Integration(Shenzhen University) College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenP.R.China Transfusion Department Sichuan Provincial People's HospitalUniversity of Electronic Science and Technology of ChinaChengduP.R.China dHong Kong Center for Cerebra-Cardiovascular Health Engineering Hong Kong Science ParkNew TerritoriesHong KongP.R.China College of Science Harbin Institute of Technology(Shenzhen)ShenzhenGuangdongP.R.China CAS-CityU Joint Laboratory for Robotic Research Shenzhen Research Institute City University of Hong KongShenzhenP.R.China

Wearable sweat sensors are gaining significant attention due to their unparalleled potential for noninvasive health ***,as a kind of body fluid,contains informative physiological indicators that are related to personalized health *** in wearable sweat sampling and routing technologies,flexible,and stretchable materials,and wireless digital technologies have led to the development of integrated sweat sensors that are comfortable,flexible,light,and ***,we report a flexible and integrated wearable device via incorporating a microfluidic system and a sensing chip with skin-integrated electronic format toward in-situ monitoring of uric acid(UA)in sweat that associates with gout,cardiovascular,and renal *** microfluidic system validly realizes the real-time capture perspiration from human *** obtained detection range is 5-200μM and the detection limit is 1.79μM,which offers an importance diagnostic method for clinical relevant lab *** soft and flexible features of the constructed device allows it to be mounted onto nearly anywhere on the *** tested the sweat UA in diverse subjects and various body locations during exercise,and similar trends were also observed by using a commercial UA assay kit.

关键词： Sweat sensors skinintegrated electronics in-situ detection microchannels wearable device