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HEAT-RESISTANT COMPOSITES CURED BY ELECTRON BEAM

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Chinese Journal of Polymer Science 2001年第1期19卷 53-57页

作者： Jian-wen bao Yang li Xiang-bao Chen Feng-mei li National Key Lab of Advanced Composites Institute of Aeronautical Materials Beijing 100095 China National Key Lab of Advanced Composites Institute of Aeronautical Materials Beijing 100095 China National Key Lab of Advanced Composites Institute of Aeronautical Materials Beijing 100095 China Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100877 China

Electron beam (EB) curing of composites has many advantages. Heat-resistant EB-curing composites could substitute polyimide composites used in aeronautical engines. In this paper, the effects of catalyst and dose on the cured resin were investigated. The heat-resistance of the resin cured by EB was evaluated by dynamic mechanical analysis (DMA). The experimental results show that the mechanical properties of the composites cured by EB could meet the specifications of aeronautical engines at 250 degreesC.

关键词： electron beam curing composites epoxy heat-resistance

Designing polymer nanocomposites with high energy density using machine learning

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npj Computational Materials 2021年第1期7卷 999-1007页

作者： Zhong-Hui Shen Zhi-Wei bao Xiao-Xing Cheng bao-wen li Han-Xing liu Yang Shen Long-Qing Chen Xiao-Guang li Ce-wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhanChina International School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina Hefei National Laboratory for Physical Sciences at the Microscale Department of Physics and CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics University of Science and Technology of China HefeiChina Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPAUnited States School of Materials Science and Engineering State Key Lab of New Ceramics and Fine ProcessingTsinghua UniversityBeijingChina

Addressing microstructure-property relations of polymer nanocomposites is vital for designing advanced dielectrics for electrostatic energy ***,we develop an integrated phase-field model to simulate the dielectric response,charge transport,and breakdown process of polymer ***,based on 6615 high-throughput calculation results,a machine learning strategy is schemed to evaluate the capability of energy *** find that parallel perovskite nanosheets prefer to block and then drive charges to migrate along with the interfaces in x-y plane,which could significantly improve the breakdown strength of polymer *** verify our predictions,we fabricate a polymer nanocomposite P(VDF-HFP)/Ca_(2)Nb_(3)O_(10),whose highest discharged energy density almost doubles to 35.9 J cm^(−3) compared with the pristine polymer,mainly benefit from the improved breakdown strength of 853 MVm^(−1).This work opens a horizon to exploit the great potential of 2D perovskite nanosheets for a wide range of applications of flexible dielectrics with the requirement of high voltage endurance.

关键词： polymer energy perovskite

Comparative Studies of 1,4-Bis[2-(4-Pyridyl)ethenyl]-benzene Using Density Functional Theory

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Chemical Research in Chinese Universities 2007年第4期23卷 469-473页

作者： CHENG Jian-bo Lǚ Jia-ping GONG bao-an li wen-zuo Science and Engineering College of Chemistry and Biology Yantai University Yantai 264005 P. R. China

The optimized molecular structure and harmonic vibrational frequencies of a 1,4-bis [ 2-（4-pyridyl）ethenyl]- benzene（BPENB） molecule were calculated via five popular density functional theory（DFI＇） methods. On the basis of the comparison between calculated and experimental results, it is concluded that the B3PW91 and B3LYP methods are superior to the others in optimizing structures, and the BPW91 method reproduces the observed fundamental fre-quencies most satisfactorily.

关键词： 1,4-Bis[2-(4-pyridyl)ethenyl]-benzene Density functional theory Vibrational frequencies BPW91

Synthesis of 3-hydroxyflavone fluorescent probes and study of their fluorescence properties

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Chinese Chemical Letters 2010年第5期21卷 529-532页

作者： Xiao Dong Zhao Chang Jun Sun Qing Qiang Yao wen bao li Institute of Materia Medica Shandong Academy of Medical SciencesJinan 250062China Sanlugen Pharma Tech 18877 Jingshi RoadJinan 250062China

Direct measurement of dipole potential in biological membranes has been impossible and 3-hydroxyflavones(3HFs) have allowed detection of changes in dipole potential in biological *** the present study,sixteen derivatives of 3HF with aliphatic hydrocarbon chains of different lengths at 4′-position and 6-position were *** basic fluorescence properties of 3HFs are maintained in all the probes in terms of strong blue shift in maximum fluorescence emission wavelength and>100 fold increase in quantum yield in organic solvents and in dioleoylphosphatidylcholine(DOPC) small unilamellar vesicles(SUV) in comparison to in aqueous Hepes buffer(15 mmol/L,pH 7.4).More importantly,the ability of the new compounds to report dipole potential changes in biological systems are also maintained,since all the new probes showed spectrum properties that are similar to yet different from that of F4N1,which potentially may allow more sensitive measurement of the dipole potential change in membranes.

关键词： 3-Hydroflavones(3HFs) Fluorescent probes ESIPT Dipole potential

High discharged energy density of polymer nanocomposites induced by Nd-doped BaTiO_(3)nanoparticles

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Journal of Materiomics 2018年第1期4卷 44-50页

作者： Jing Wang Juntao Hu Lu Yang Kongjun Zhu bao-wen li Qiaomei Sun Yanxin li Jinhao Qiu State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

A flexible polymer nanocomposite has been developed via introducing Nd-doped BaTiO_(3)nanoparticles into the poly(vinylidene fluoride).This nanocomposite delivers a discharged energy density up to 12.5 J/cm^(3)under an electric field of 420 kV/mmwith only a small loading of 1 vol.%Nd-BaTiO_(3).High discharged energy density,mechanical flexibility,light weight,ease fabrication and low cost makes it attractive for advanced microelectronics and electrical power *** results demonstrate that ceramics with giant dielectric permittivity as viable fillers for polymer nanocomposite dielectrics with higher energy density.

关键词： Nd doped BaTiO_(3) High discharged energy density

Advances of phononics in 2012-2022

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Chinese Physics B 2022年第12期31卷 383-394页

作者： Ya-Fei Ding Gui-Mei Zhu Xiang-Ying Shen Xue Bai bao-wen li Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Bourida LLC Qingdao 264000China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Department of Physics Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Paul M Rady Department of Mechanical Engineering and Department of Physics University of ColoradoBoulderColorado 80305-0427USA

Due to its great potential applications in thermal management,heat control,and quantum information,phononics has gained increasing attentions since the first publication in ***.841045(2012).Many theoretical and experimental progresses have been achieved in the past *** this paper,we first give a critical review of the progress in thermal diodes and transistors,especially in classical ***,we give a brief introduction to the new developing research directions such as topological phononics and quantum *** the third part,we discuss the potential *** but not least,we point out the outlook and challenges ahead.

关键词： phononics thermal diode thermal transistor thermal control devices

Graphene/SiC-coated textiles with excellent electromagnetic interference shielding,Joule heating,high-temperature resistance,and pressure-sensing performances

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Journal of Advanced Ceramics 2023年第4期12卷 778-791页

作者： Chongjie Wang Qingfang Xu Jinrong Hu Pengjan Lu Han Wu Bingian Guo Rong Tu Kai liu Meijun Yang Song Zhang bao-wen li Chuanbin Wang lianmeng Zhang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Wuhan Tuocai Technology Co. Ltd.Ezhou 436032China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000China Zhejiang MTCN Technology Co. Ltd.Huzhou 311103China Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City Zhongshan 528400China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

Multifunctional,wearable,and durable textiles integrated with smart electronics have attracted tremendous ***,it remains a great challenge to balance new functionalities with high-temperature ***,textile-based pressure sensors with excellent electromagnetic interference(EMI)shielding,Joule heating,and high-temperature resistance were fabricated by constructing graphene/SiC(G/SiC)heterostructures on carbon cloth via laser chemical vapor deposition(LCVD).The resultant textiles exhibited excellent EMI efficiency of 74.2 dB with a thickness of 0.45 mm,Joule heating performance within a low working voltage(V)range of 1-3 V,and fast response time within 20 *** properties arose from multiple reflections,interfacial polarization,and high conductivity due to the numerous amounts of nanoscale G/SiC *** importantly,G/SiC/carbon fibers(CFs)demonstrated well high-temperature resistance with a heat resistance index(THri)of 380.2 C owing to the protection of a coating layer on the CFs upon ***,the G/SiC/CFs presented good pressure-sensing performance with high sensitivity(S)of 52.93 kPal,fast response time of 85 ms,and a wide pressure range of up to 186 *** features imply the potential of the G/SiC/CFs as efficient EMI shielding,electrical heater,and piezoresistive sensor textiles.

关键词： graphene/SiC(G/SiC) electromagnetic interference(EMI)shielding Joule heating pressure-sensing high-temperature resistance

Fourier domain optical coherence tomography with ultralong depth range

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Frontiers of Optoelectronics 2015年第2期8卷 163-169页

作者： Zhihua DING Yi SHEN wen bao Peng li State Key Lab of Modem Optical Instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027 China

The depth ranges of typical implementations of Fourier domain optical coherence tomography （FDOCT）, including spectral domain OCT （SDOCT） and swept source OCT （SSOCT）, are limited to several millimeters. To extend the depth range of current OCT systems, two novel systems with ultralong depth range were developed in this study. One is the orthogonal dispersive SDOCT （OD-SDOCT）, and the other is the recirculated swept source （R-SS） interferometer/OCT. No compromise between depth range and depth resolution is required in both systems. The developed OD-SDOCT system realized the longest depth range （over 100 mm） ever achieved by SDOCT, which is ready to be modified for depth-encoded parallel imaging on multiple sites. The developed R-SS interferometer achieved submicron precision within a depth range of 30mm, holding potential in real-time contact-free on-axis metrology of complex optical sys- tems.

关键词： optical coherence tomography (OCT) vir-tually-imaged phased array (VIPA) orthogonal dispersion,swept source light recirculation parallel imaging dimen-sional metrology

Flexible high-performance microcapacitors enabled by all-printed two-dimensional nanosheets

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Science Bulletin 2022年第24期67卷 2541-2549,M0004页

作者： Pengxiang Zhang Yushui Fu Xin Zhang Xihua Zhang bao-wen li Ce-wen Nan Key Laboratory for liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Chemically exfoliated nanosheets have exhibited great potential for applications in various electronic ***-based processing strategies such as inkjet printing provide a low-cost,environmentally friendly,and scalable route for the fabrication of flexible devices based on functional inks of twodimensional *** this study,chemically exfoliated high-k perovskite nanosheets(i.e.,Ca_(2)Nb_(3)O_(10)and Ca_(2)NaNb_(4)O_(13))are well dispersed in appropriate solvents to prepare printable inks,and then,a series of microcapacitors with Ag and graphene electrodes are *** resulting microcapacitors,Ag/Ca_(2)Nb_(3)O_(10)/Ag,graphene/Ca_(2)Nb_(3)O_(10)/graphene,and graphene/Ca_(2)NaNb_(4)O_(13)/graphene,demonstrate high capacitance densities of 20,80,and 150 nF/cm^(2) and high dielectric constants of 26,*** 200,*** dielectric enhancement in the microcapacitors with graphene electrodes is possibly attributed to the dielectric/graphene *** addition,these microcapacitors also exhibit good insulating performance with a moderate electrical breakdown strength of approximately 1 MV/cm,excellent flexibility,and thermal stability up to 200℃.This work demonstrates the potential of high-k perovskite nanosheets for additive manufacturing of flexible high-performance dielectric capacitors.

关键词： High-k perovskite nanosheets Inkjet printing Microcapacitors Dielectric enhancement Interface effect