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Analysis of electromagnetic pulses generated from ultrashort laser irradiation of solid targets at CLAPA

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Chinese Physics B 2022年第2期31卷 489-495页

作者： Yi-Lin xu dong-Yu Li Ya-dong xia Si-Yuan Zhang Min-Jian Wu Tong yang Jun-Gao Zhu Hao Cheng Chuan-Ke Wang Chen Lin Ting-Shuai Li xue-Qing yan school of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China state key laboratory of Nuclear Physics and Technology and Key Laboratory of HEDP of the Ministry of EducationCAPTPeking UniversityBeijing 100871China Research Center of Laser Fusion China Academy of Engineering Physics(CAEP)Mianyang 621900China

Electromagnetic pulses(EMPs)produced by the interaction of a TW femtosecond laser with solid targets at the Compact Laser Plasma Accelerator(CLAPA)are measured and *** statistical results confirm that the intensities of the EMPs are closely related to both target material and *** signal of the titanium target is more abundant than that of the copper target with the same thickness,and the intensity of EMP is positively correlated with the target thickness for aluminium *** the boosted EMP radiations,the energy of accelerated protons is also simultaneously *** addition,EMPs emitted from the front of the target exceed those from the rear,which are also pertinent to the specific target *** resonant waveforms in the target chamber are analyzed using the fast Fourier transform,and the local resonance and the attenuation lead to changes of the frequency spectra of EMPs with variation of detecting positions,which is well supported by the modeling *** findings are beneficial to gaining insight into the mechanism of EMP propagation in a typical target chamber and providing more information for EMP shielding design.

关键词： laser driven proton accleration electromagnetic pulses laser target

Stimuli-Responsive lonic Liquids and the Regulation of Aggrega-tion Structure and Phase Behavior

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Chinese Journal of Chemistry 2021年第3期39卷 729-744页

作者： xiao-Qing Yuan Ya-Qin Zhang Zhi-Yong Li Feng Huo Yi-Hui dong Hong-yan He beijing key laboratory of lonic Liquids Clean Process CAS Key Laboratory of Green Process and EngineeringState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBejling 100190China Dalian National laboratory for Clean Energy DalianLiaoning 116023China Collaborative Innovation Center of Henan Province for Green Manufacturing of fine Chemicals Key Laboratory of Green Chermical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiangHenan 453007China

lonic liquids with stimuli-responsive characteristics are an essential branch in the comprehensive ionic liquids'family,which can meet the controllable and reversible needs in practical applications with different stimulation *** this review,we summarize the recent research progress of these stimuli-responsive ionic liquids,mainly focusing on their chemical structures,properties,responsive mechanism,aggregation structures,and phase behaviors,which were driven by external stimuli,such as CO2,magnetism,light,temperature,redox,and ***,the particular or potential applications of stimuli-responsive ionic liquids are expounded in various fields of science,including catalytic reaction,extraction,separation,nano-material preparation,and gas *** the end,the challenges and strategies of the subject are briefly *** is expected that this review will contribute to the rational design and applications of stimu-liresponsive ionic liquids in the future.

关键词： lonic liquids Stimuli Responsive Aggregation Phase behavior

Phase coexistence and evolution in sol-gel derived BY-PT-PZ ceramics with significantly enhanced piezoelectricity and high temperature stability

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Journal of Materiomics 2019年第3期5卷 394-403页

作者： Kai Cai xue yan Pingye Deng Li Jin yang Bai Fei Zeng dong Guo beijing Center for Physical and Chemical Analysis Beijing100089China school of materials science and engineering Beihang UniversityBeijing100191China Electronic materials Research laboratory School of Electronic and Information EngineeringXi'an Jiaotong UniversityXi'an710049China school of materials science and engineering University of Science and Technology BeijngBeijing100083China school of material science and engineering Tsinghua UniversityBeijing100084China Institute of Acoustics Chinese Academy of SciencesBeijing100190China

In this study,high Curie Temperature(T_(c))perovskite ceramics of optimized composition 0.55(0.1BiYbO_(3)-0.9PbTiO_(3))-0.45PbZrO_(3) with unique double orthorhombic main phases were prepared by a modified solgel *** to the usual solid-state prepared sample,the sol-gel derived sample has a 1.6 times higher d_(33) of 325 pC/N,a 2.4 times higher remnant polarization,and a much better high temperature stability with similar depolarization temperature(T_(d))and T_(c).Comprehensive analysis of the xerogel prepared over a wide calcination temperature(T_(cal))range of 300-1000℃ revealed that perovskite structure appeared at only 400℃ and it became the main phase above 500℃.Comparison of XRD refinement results showed that calcination and sintering induced subtle and continuous phase transition,namely,the 400-900℃ calcined powders with coexisted tetragonal(P4mm)and orthorhombic(Pbam)phase changed to a rather stable double orthorhombic(Pmmm and Pbam)main phase in all the differently sintered ceramics,as similar to the 1000C calcined *** stable phase coexistence well explains the enhanced *** results also demonstrate that optimized sol-gel processing can provide high T_(c) ceramics with desirable multi-phase structure and significantly enhanced performance at a lower temperature.

关键词： Piezoelectricity Curie temperature Phase transition Sol-gel Perovskite

Mesoporous carbon nanosheet-assembled flowers towards superior potassium storage

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Chinese Chemical Letters 2021年第3期32卷 1161-1164页

作者： xianghua Zhang dong Chen yanping Zhou Dan yang Weiling Liu Yuezhan Feng xianhong Rui yan Yu school of materials and Energy Guangdong University of TechnologyGuangzhou 510006China College of Electronics and Information engineering Sichuan UniversityChengdu 610065China Hefei National laboratory for Physical sciences at the Microscale Department of Materials Science and EngineeringKey Laboratory of Materials for Energy ConversionChinese Academy of Sciences(CAS)University of Science and Technology of ChinaHefei 230026China Dalian National laboratory for Clean Energy(DNL) Chinese Academy of SciencesDalian 116023China state key laboratory of Fire science University of Science and Technology of ChinaHefei 230026China school of materials science and engineering Nanyang Technological UniversitySingapore 639798Singapore key laboratory of materials processing and Mold(Zhengzhou university) Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Potassium-ion batteries(PIBs)are attracted tremendous interest for large-scale energy storage systems(ESSs)owing to their economic ***,the main challenges of the PIBs are sluggish K-ion diffusion and large volume variations in the potassium repeated intercalation/***,mesoporous carbon nanosheet-assembled flowers(abbreviated as F-C)are designed as an original anode for superior-performance ***,the F-C anode exhibits a high K-storage capacity(e.g.,381 mAh/g at 50 mA/g during the 2^(nd)cycle),excellent rate performance(e.g.,101 mAh/g at 2.0 A/g)and superior long cycle *** excellent K-ion storage property is largely benefited from the large surface area(~141 m^(2)/g)and reasonable pore volume(0.465 cm^(3)/g),which not only stimulates rapid Kions diffusion and relieves the huge volume strain,but also exposes extensive active sites for K-ion capacitive storage.

关键词： Potassium-ion battery Anode material Mesoporous carbon Nanosheet-assembled flowers High-rate capability

Acceptor-Donor-Acceptor Conjugated Oligomers Based on Diketopyrrolopyrrole and Thienoacenes with Four, Five and Six Rings for Organic Thin-film Transistors

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Chinese Journal of Polymer science 2017年第4期35卷 480-489页

作者： Qian Du Jing Shao Yao Gao Wei-li Li Hong-kun Tian dong-hang yan 耿延候 Fo-song Wang school of material science and engineering and Collaborative Innovation Centre of Chemical science and engineering(Tianjin) Tianjin University The 46th Institute of the Sixth Academy of China Aerospace science&Industry Corporation state key laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences

Three acceptor-donor-acceptor （A-D-A） conjugated oligomers, i.e., O1, 02 and 03, have been synthesized using diketopyrrolopyrrole （DPP） as an electron-acceptor unit, and naphtho[1,2-b：5,6-b＇]dithiophene （NDT）, anthra[1,2-b：5,6- b＇]dithiophene （ADT） or dithieno[3,2-b：Y,2＇-b＇]naphtbo[1,2-b：5,6-b＇]dithiophene （DTNDT） as electron-donor unit. These oligomers exhibit identical highest occupied molecular orbital （HOMO） and lowest unoccupied molecular orbital （LUMO） energy levels, which were ca. -5.1 and -3.3 eV, respectively. Upon thermal annealing, all three oligomers formed thin films with ordered microstructures, and their organic thin film transistors （OTFTs） exhibited p-type transport behavior. The mobility was increased with an extension of the size of D-units. 03 showed the best OTFT performance with the mobility of up to 0.20 cm2·V-1 ·s-1. The film quality of 03 was improved by adding 1 wt% poly（methylmethacrylate）（PMMA）. In consequence, the mobility of the O3-based devices was further enhanced to 0.30 cm2·V-1 ·s-1.

关键词： Diketopyrrolopyrrole (DPP) Thienoacene Conjugated oligomers Organic thin-film transistors (OTFTs)

Superior wide-temperature lithium storage in a porous cobalt vanadate

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Nano Research 2020年第7期13卷 1867-1874页

作者： Haoliang Chen Dan yang xueye Zhuang dong Chen Weiling Liu Qi Zhang Huey Hoon Hng xianhong Rui Qingyu yan Shaoming Huang Guangzhou key laboratory of Low-Dimensional materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China school of materials science and engineering Nanyang Technological UniversitySingapore 639798Singapore state key laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China

Lithium ion batteries(LIBs)that can be operated under extended temperature range hold significant application *** in this work,we successfully synthesized Co2V2O7 electrode with rich porosity from a facile hydrothermal and combustion *** applied as anode for LIBs,the electrode displayed excellent stability and rate performance in a wide range of ***,a stable capacity of 206 mAhg 1 was retained after cycling at a high current density of 10 A·g-1 for 6,000 cycles at room temperature(25℃).And even when tested under extreme conditions,i.e.,-20 and 60℃,the battery still maintained its remarkable stability and rate *** example,at-20℃,a capacity of 633 mAh·g 1 was retained after 50 cycles at 0.1 A·g 1;and even after cycling at 60℃ at 10 A·g-1 for 1,000 cycles,a reversible capacity of 885 mAh·g-1 can be *** believe the development of such electrode material will fciliate progress of the next-generation LIBs with wide operating windows.

关键词： lithium-ion battery anode material cobalt vanadate porous structure wide-temperature performance

Hyper-crosslinked Conjugated Microporous Polymers with Increased Micropores Promotes Confining Polymerization for Electromagnetic Absorption Application

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Chinese Journal of Polymer science 2023年第8期41卷 1305-1316,I0011页

作者： Hao Chen Fang-Yuan Chu Hai-yan Zhuang Lu Wang Zhi-Min Ye Wei dong Zhi-Peng xie A-Ming xie school of Mechanical engineering Nanjing University of Science&TechnologyNanjing 210094China state key laboratory for Marine Corrosion and Protection Luoyang Ship Material Research Institute(LSMRI)Xiamen 361100China school of Chemistry and Chemical engineering Nanjing University of Science&TechnologyNanjing 210094China

Conjugated microporous polymers have excellent skeleton structures but poor electrical conductivity limits their applications in microwave *** solve this problem,a strategy of molecular expansion and confining polymerization is proposed in this work to synthesize conductive hyper-crosslinked conjugated microporous *** topology of the conjugated microporous polymer is changed into a three-dimensional skeleton structure with high specific surface area by using molecular expansion technique,and the controlled growth of polypyrrole in the channel constructs a unique network *** balance of excellent composite backbone structure,proper conductivity,attenuation capability and impedance matching enable the material to exhibit electromagnetic wave absorption *** a result,with low filler loading of 10 wt%,a strongest reflection loss of-52.68 d B and a maximum effective bandwidth of 5.76 ***,CST simulations of the radar scattering cross section have been carried out to verify the excellent material *** study provides new concepts for new conductive polymers and broadens the application of hyper-crosslinked conjugated microporous polymer in the field of electromagnetic wave absorption.

关键词： Hyper-crosslinked conjugated microporous polymer Electromagnetic wave absorbing Molecular expansion Polypyrrole

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预测典型变形高温合金均匀化动力学的新模型

Transactions of Nonferrous Metals Society of China 2024年第4期34卷 1178-1190页

作者：张献光杨文超周扬闫建昊肖东平税烺付建辉孙飞石鹏陈佳俊裴逸武张健北京科技大学绿色低碳钢铁冶金全国重点实验室北京100083 北京科技大学冶金与生态工程学院北京100083 成都先进金属材料产业技术研究院股份有限公司成都610300 攀钢集团研究院有限公司攀枝花617000 Department of material Design Innovation engineering Nagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan

提出一种基于扩散距离概念的变形高温合金均匀化动力学新预测模型。通过定量电子探针(EPMA)分析,系统研究典型镍基变形高温合金(GH4141)的微观偏析和均匀化动力学。研究发现,基于残余偏析指数模型预测的均匀化动力学与实际测量结果之间... 详细信息

提出一种基于扩散距离概念的变形高温合金均匀化动力学新预测模型。通过定量电子探针(EPMA)分析,系统研究典型镍基变形高温合金(GH4141)的微观偏析和均匀化动力学。研究发现,基于残余偏析指数模型预测的均匀化动力学与实际测量结果之间存在一定差异。实验和理论分析均表明,考虑了过去通常被忽略的扩散方向因子的一维扩散距离模型可以合理地预测均化动力学。新模型在只需知道原始枝晶臂间距和扩散系数前提下即可完成预测计算,这为变形高温合金均匀化动力学预测提供了一种新的选择。

关键词：变形高温合金微观偏析均匀化动力学预测模型扩散距离

Hierarchical polypyrrole@cobalt sulfide-based flexible on-chip microsupercapacitors with ultrahigh energy density for selfcharging system

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Nano Research 2023年第1期16卷 555-563页

作者： yan zhao Jihua Zheng Jing yang Wenjie Liu Fen Qiao Jiabiao Lian Guochun Li Tao Wang jiangwei Zhang Limin Wu College of Energy material and Chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China Institute for Energy Research School of Energy&Power EngineeringJiangsu UniversityZhenjiang 212013China Department of materials science Fudan UniversityShanghai 200433China key laboratory of power Station Energy Transfer Conversion and System Ministry of EducationNorth China Electric Power UniversityBeijing 102206China

Herein,we prepare the unique hierarchical polypyrrole@cobalt sulfide(PPy-hs@CoS)hollow sphere-based nanofilms as interdigitated electrodes for flexible on-chip micro-supercapacitors(MSC).Benefiting from the excellent flexibility and high electrical conductivity of PPy-hs combined with the great electrochemical activity of CoS,such PPy-hs@CoS composite material can not only inhibit the volume expansion of PPy but also promote the diffusion of the electrolyte *** PPy-hs@CoS filmbased electrode delivers a greatly improved specific capacitance and small *** functional theory calculations infer that OH−prefers to bind to PPy on CoS@PPy and confirms the synergistic effect of each component for enhanced reaction kinetics.A quasi-solid-state on-chip flexible asymmetric MSC based on PPy-hs@CoS and activated carbon(AC)microelectrodes exhibits large areal-specific capacitance(131.9 mF/cm2 at 0.3 mA/cm2),ultrahigh energy density(0.041 mWh/cm2@0.224 mW/cm2 and 25.6 mWh/cm3@140.6 mW/cm3),and long cycle *** demonstrate the possibility to scale up the PPy-hs@CoS nanofilm microelectrode by arranging two of our asymmetric MSC in series and parallel connections,which respectively increase the output voltage and current.A self-charging system by connecting our asymmetric MSCs with a piece of commercial solar cells is developed as a potential possible mode for future highly durable and high-voltage integrated electronics.

关键词： polypyrrole cobalt sulfide adsorption energy on-chip micro-supercapacitor self-charging device