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Simultaneous growth of carbon nanotubes on inner/outer surfaces of porous polyhedra:Advanced sulfur hosts for lithium-sulfur batteries

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Nano Research 2018年第12期11卷 6155-6166页

作者： hengyi Lu Chao Zhang Youfang Zhang Yunpeng Huang Mingkai Liu Tianxi Liu State Key Laboratory for Modification of Chemical Iqbers and Polymer Materials College of Materials Science and EngineeringInnovation Center for.Textile Science and TechnologyDonghua University2999North Renmin RoadShanghai201620China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University220Handan RoadShanghai 200433China School of Chemistry and Chemical Engineering Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional MaterialsJiangsu Normal UniversityXuzhou 221116China

Metal-organic framework (MOF)-derived functional carbon matrices have recently attracted considerable attention as energy-storage materials. However, the development of MOF-derived carbon materials with hierarchical structures, capable of thoroughly preventing the “shuttling᾿of polysulfides, is still a major challenge. Herein, we synthesized cobalt nanoparticle-containing porous carbon polyhedra with in situ grown N-doped carbon nanotube (CNT) backbone (NCCNT-Co), using zeolitic imidazolate framework-67 (ZIF-67) as starting material. The obtained NCCNT-Co, with interconnected N-doped CNTs on both inner and outer surfaces, possesses an integrated conductive network, which can further accelerate the transport of electrons/ions inside the whole sulfur cathode. The mesoporous structure derived from the ZIF-67 matrix and the densely immobilized CNTs, coupled with the homogeneously doped N atoms and Co nanoparticles, can efficiently trap lithium polysulfides (LiPSs) by physical confinement and chemical interactions. Furthermore, the hierarchical structure of the porous carbon polyhedra enables a high sulfur loading of up to 76 wt.% and can also buffer the volume changes of active sulfur during the lithiation process. As a result, the NCCNT-Co-S cathode delivers a high initial specific capacity of 1,300 mAh·g−1 at 0.1 C, along with a high capacity of 860 mAh·g−1 after 500 cycles at 1 C, with an extremely low capacity decay of 0.024% per cycle.

关键词： zeolitic imidazolate framework-67 (ZIF-67) carbon nanotubes in situ growth Li-S batteries

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Controllable self-assemblies of β-cyclodextrin-calix[4]arene couples

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Science China Chemistry 2012年第6期55卷 1092-1096页

作者： LI Liang ZHANG hengyi LIU Yu State Key Laboratory of Elemento-Organic Chemistry Department of Chemistry Nankai University Tianjin 300071 China

Arnphiphilic cyclodextrin-calixarene conjugates 1 and 2 were synthesized from "click claemxstry, and tnelr sen-asscmuly uchaviors were investigated by transmission electron microscopy, and atomic force microscopy. The results obtained show that 1 and 2 can self-assemble to form distinctly different aggregations, and the morphology of aggregations critically relies on the polarity and hydrophilicity of the solvent.

关键词： cyclodextrin calixarene self-assembly

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面向轴承生产线的视觉检测光源系统

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轴承 2025年第1期 88-94页

作者：黄振宇金京钱淼浙江理工大学机械工程学院杭州310018 浙江迎丰科技股份有限公司浙江绍兴312073

为降低工业自动化生产过程中轴承端面块状瑕疵的漏检率和误检率,对视觉检测常用的光源类型进行了对比试验,在工业环境下采用不同光源获取图像并使用不同的图像增强算法进行优化处理,通过像素点检测的方式检测轴承端面块状瑕疵,以工厂的... 详细信息

为降低工业自动化生产过程中轴承端面块状瑕疵的漏检率和误检率,对视觉检测常用的光源类型进行了对比试验,在工业环境下采用不同光源获取图像并使用不同的图像增强算法进行优化处理,通过像素点检测的方式检测轴承端面块状瑕疵,以工厂的检测标准进行应用验证。结果表明:同轴光源作为视觉光源时所采集图像在各种图像增强算法处理下的检测效果均好于其他光源;自适应直方图均衡化对轴承端面瑕疵的总体检测效果较好,Gamma变换则对降低漏检率有较好作用。

关键词：滚动轴承机器视觉光源表面缺陷检测图像处理

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Highly Efficient and Stable Blue OLEDs Based on B-N Bonds Embedded 6,12-Diphenyl-5,11-dihydroindolo[3,2-b]carbazole with Narrowband Emission and Extended Lifetime

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Chinese Journal of Chemistry 2023年第6期41卷 657-664页

作者： hengyi Dai Jianping Zhou Guoyun Meng Lu Wang Lian Duan Dongdong Zhang Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua University Beijing 100084China Center for Flexible Electronics Technology Tsinghua UniversityBejing 100084China

Emitters with narrowband spectra are of great importance nowadays because of the growing demand for ultra-high-definition displays in the fields of panel displays and solid-state *** the reported multiple resonance(MR)emitters have been widely studied with extremely sharp spectra and color-tunable emissions,the electrophilic borylation synthetic strategies and stable narrowband blue devices still face great challenges.

关键词： Ultrapure blue luminescence Boron-nitrogen bonds Fluorescence emitter Organic light-emitting diodes Indolocarbazole skeleton

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Finite-element modelling of frictional behaviour between oesophagus and endoscope

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Biosurface and Biotribology 2020年第3期6卷 75-81页

作者： Chengxiong Lin Pan Ren Wei Li hengyi Deng Zhongrong Zhou Key Laboratory for Advanced Technology of Materials of Ministry of Education Tribology Research InstituteSouthwest Jiaotong UniversityChengdu 610031People’s Republic of China Department of General Surgery Chengdu Second People’s HospitalChengdu 610017People’s Republic of China

The endoscopy is the most direct and effective means for digestive tract *** workers can conduct a series of manipulations with the help of endoscope,including checking,removing,stripping the diseased tissue or placing the *** order to understand the frictional behaviour at the endoscope-oesophagus interface,the finite-element model was analysed by Abaqus in this *** the different modelling conditions,the total force due to frictional stress,frictional dissipation and the maximum Mises stress for the whole model were *** showed that with the increasing amplitude,coefficient of friction and decreasing diameter,the total forces due to the frictional stress and the FD increased *** did not present a clear difference with the variable distance for overlapping parts(region L).The positions of maximum Mises stress for the whole model under different conditions mainly focused on the initial part of the region *** maximum Mises stress between different diameters showed a big *** results can provide the basic data for the finite-element modelling of frictional behaviour of human tissue.

关键词： friction frictional behaviour

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Yarn spun from carbon nanotube forests:Production,structure,properties and applications

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Particuology 2013年第4期11卷 378-393页

作者： Menghe miao CSIRO Materials Science and Engineering

The discovery of drawable carbon nanotube forests opened up the possibility of constructing a wide range of pure carbon nanotube macrostructures and sparked interests in developing applications from these structures, especially pure carbon nanotube yarns. This review examines the various facets of the draw- able carbon nanotube forests, synthesis and drawability, and their resulting yarns, structure, production, properties and applications. The structure, formation and properties of carbon nanotube yarns are com- pared with those of conventional textile yarns in order to obtain a better understanding of the science, structural mechanics and processing technology involved in carbon nanotube yarns.

关键词： Carbon nanotubeSynthesisDrawingSpinningYarnStructural mechanics

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Immobilization of NiS nanoparticles on N-doped carbon fiber aerogels as advanced electrode materials for supercapacitors

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Nano Research 2016年第9期9卷 2747-2759页

作者： Youfang Zhang Lizeng Zuo Longsheng Zhang Jiajie Yan hengyi Lu Wei Fan Tianxi Liu State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University220 Handan RoadShanghai 200433China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620China

NiS nanoparticles (NPs) with excellent electrochemical capacitance have attracted considerable attention as cost-effective energy-storage materials for supercapacitors in recent years. Preventing the aggregation and increasing the conductivity of NiS NPs are key to fully realizing their excellent electrochemical properties. In this work, NiS/N-doped carbon fiber aerogel (N-CFA) nanocomposites were obtained easily through the combination of polymerization, carbonization, and a one-step solvothermal reaction. N-CFA derived from polydopamine (PDA)-coated cotton wool was used as a template for the construction of hierarchical NiS/N-CFA nanocomposites, in which NiS NPs are uniformly immobilized on the surface of N-CFA. In this nanostructured system, N-CFA containing abundant nanofibers not only provides active regions for the growth of NiS NPs to prevent their aggregation, but also offers short pathways for the transport of electrons and ions. The electrochemical properties of the obtained NiS/N-CFA nanocomposites were investigated by cyclic voltammetry, galvanostatic charge–discharge, and alternating current impedance measurements. The optimized NiS/N-CFA nanocomposite exhibits a high specific capacitance of 1,612.5 F·g1at a charge/discharge current density of 1 A·g1and excellent rate capacitance retention of 66.7% at 20 A·g1. The excellent electrochemical properties of NiS/N-CFA nanocomposites make these materials promising electrode materials for supercapacitors. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： NiS cotton wool carbon fiber aerogels N-doping supercapacitors

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Hyperbranched Supramolecular Polymer of Tris(permethyl-β- cyclodextrin)s with Porphyrins: Characterization and Magnetic Resonance Imaging

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Chinese Journal of Chemistry 2014年第8期32卷 771-776页

作者： Mo Sun hengyi Zhang Xinyue Hu Bowen Liu Yu Liu Department of Chemistry State Key Laboratory of Elemento-Organic ChemistryNankai UniversityCollaborative Innovation Center of Chemical Science and EngineeringTianjin 300071China

A hyperbranched supramolecular polymer(HSP)is constructed based on the intermolecular inclusion complexation of bridged tris(permethyl-β-cyclodextrin)with Mn^(Ⅲ)-porphyrin bearing poly(ethylene glycol)(PEG)side chains(Mn^(Ⅲ)-TPP),and characterized by UV/vis absorption spectroscopy,isothermal titration calorimetry(ITC),NMR,dynamic light scattering(DLS),atomic force microscopy(AFM)and transmission electron microscopy(TEM),*** presence of permethyl-β-cyclodextrin can stabilize the low-valent Mn^(II)-*** vitro cell experiment indicates that this HSP has no remarkable cellular toxicity against NIH 3T3 *** vitro MR imaging experiment indicates a slightly increased T_(1) relaxivity for this HSP compared to that for the linear supramolecular polymer.

关键词： hyperbranched supramolecular polymer host-guest system cyclodextrin Mn-porphyrin MRI

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New framework of low-carbon city development of China:Underground space based integrated energy systems

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Underground Space 2024年第1期14卷 300-318页

作者： Boyu Qin hengyi Li Zhaojian Wang Yuan Jiang Dechun Lu Xiuli Du Qihu Qian Xi’an Jiaotong University Xi’an 710049China Shanghai Jiaotong University Shanghai 200240China Center for Strategic Studies Chinese Academy of EngineeringBeijing 100088China Beijing University of Technology Beijing 100124China Army Engineering University Nanjing 210007China

Cities play a vital role in social development,which contribute to more than 70%of global carbon ***-carbon city construction and decarbonization of the energy sector are the critical strategies to cope with the increasingly serious climate change problems,and low-carbon technologies have attracted extensive ***,the potential of such technologies to reduce carbon emissions is constrained by various factors,such as space,operational environment,and safety *** an essential territorial natural resource,underground space can provide large-scale and stable space support for existing low-carbon *** underground space and low-carbon technologies could be a promising approach towards carbon neutrality,and hence,warrants further ***,a comprehensive review of the existing low-carbon technologies including the technical bottlenecks is ***,the features of underground space and its low carbon potential are ***,a framework for the underground space based integrated energy system is proposed,including system configuration,operational mechanisms,and the resulting ***,the research prospect and key challenges required to be settled are highlighted.

关键词： Underground space Low-carbon city Integrated energy system Carbon neutrality

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Chemical simulation teaching system based on virtual reality and gesture interaction

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虚拟现实与智能硬件（中英文） 2024年第2期6卷 148-168页

作者： Dengzhen LU hengyi LI Boyu QIU Siyuan LIU Shuhan QI School of Computer Science and Technology Harbin Institute of TechnologyShenzhen 518055China Pengcheng Laboratory Shenzhen 518052China

Background Most existing chemical experiment teaching systems lack solid immersive experiences,making it difficult to engage *** address these challenges,we propose a chemical simulation teaching system based on virtual reality and gesture *** The parameters of the models were obtained through actual investigation,whereby Blender and 3DS MAX were used to model and import these parameters into a physics *** establishing an interface for the physics engine,gesture interaction hardware,and virtual reality(VR)helmet,a highly realistic chemical experiment environment was *** code script logic,particle systems,as well as other systems,chemical phenomena were ***,we created an online teaching platform using streaming media and databases to address the problems of distance *** The proposed system was evaluated against two mainstream products in the *** the experiments,the proposed system outperformed the other products in terms of fidelity and *** The proposed system which offers realistic simulations and practicability,can help improve the high school chemistry experimental education.

关键词： Chemical experiment simulation Gesture interaction Virtual reality Model establishment Process control Streaming media Database

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