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In-situ self-templating synthesis of 3D hierarchical porous carbonsfrom oxygen-bridged porous organic polymers for highperformance supercapacitors

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Nano Research 2022年第9期15卷 7759-7768页

作者： Qi Xiong Bei Liu Yijiang Liu Pu Wang Hua Cheng Huaming Li Zhouguang Lu Mei Yang College of Chemistry Xiangtan UniversityXiangtan 411105China Key Laboratory of Polymeric Materials&Application Technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materialsof College of Hunan Provinceand Key Lab of Environment-Friendly Chemistry and Application in Ministry of EducationXiangtan UniversityXiangtan 411105China Department of Materials Science&Engineering Shenzhen Key Laboratory of Interfacial Science and Engineering of MaterialsSouthern Universityof Science and TechnologyShenzhen 518055China

It is a big challenge to well control the porous structure of carbon materials for supercapacitor ***,a simple in-situ self-templating strategy is developed to prepare three-dimensional(3D)hierarchical porous carbons with good combination of micro and meso-porous architecture derived from a new oxygen-bridged porous organic polymer(OPOP).The OPOP is produced by the condensation polymerization of cyanuric chloride and hydroquinone in NaOH ethanol solution and NaCl is in-situ formed as by-product that will serve as template to construct an interconnected 3D hierarchical porous architecture upon *** large interface pore architecture,and rich doping of N and O heteroatoms effectively promote the electrolyte accessibility and electronic conductivity,and provide abundant active sites for energy ***,the supercapacitors based on the optimized OPOP-800 sample display an energy density of 8.44 and 27.28 Wh·kg^(−1)in 6.0 M KOH and 1.0 M Na2SO4 electrolytes,*** capacitance retention is more than 94%after 10,000 ***,density functional theory(DFT)calculations have been employed to unveil the charge storage mechanism in the *** results presented in this job are inspiring in finely tuning the porous structure to optimize the supercapacitive performance of carbon materials.

关键词： in-situ self-templating porous organic polymer three-dimensional(3D)hierarchical porous carbons supercapacitors

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Microstructural and mechanical behavior of a CoCrFeNiCu_4 non-equiatomic high entropy alloy

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Journal of Materials Science & technology 2021年第1期60卷 35-43页

作者： Zijuan Xu Zhongtao Li Yang Tong Weidong Zhang Zhenggang Wu College of Materials Science and Engineering Hunan Province Key Laboratory for Spray Deposition Technology and ApplicationHunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA

High entropy alloy(HEA)-based alloy design is experiencing a conceptual broadening from equiatomic alloys to non-equiatomic *** provide experimental basis for designing Cu-rich non-equiatomic HEAs,in the current study,a dual phase(Cu-rich and CoCrFeNi-rich phases) face-centered cubic CoCrFeNiCu_(4) alloy was systematically *** provided initial and experiment-based understanding of the behavioral change of the alloy during a variety of thermal cycles and thermomechanical *** current results indicate that,during heating,preferred precipitation of Cu-rich particles occurs,leading to more pronounced compositional differences between the two constituent FCC phases and increased relative volume fraction of the Cu-rich *** Alloy exhibits a continuous melting and discontinuous solidification of the Cu-rich and CoCrFeNi-rich *** being cold-rolled to ~90 % thickness reduction,the alloy exhibits a recrystallization temperature higher than 800℃.Annealing at 300 and 500℃ led to strength reduction and/or ductility decrease;further increasing annealing temperature monotonically caused softening and ductilization due to decreased density of pre-existing *** yield-drop phenomena observed for the 900℃-and 1000℃-annealed specimens are associated with the locking of pre-existing dislocations by some "atmosphere",the nature of which warrants further elucidation.

关键词： High entropy alloy Non-equiatomic alloy Microstructure Melting and solidification Mechanical behavior

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Numerical Modeling of Thermal Conductivity of Diamond Particle Reinforced Aluminum Composite

Numerical Modeling of Thermal Conductivity of Diamond Partic...

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第八届中国功能材料及其应用学术会议

作者： YANG Wu-lin PENG Kun ZHU Jia-jun LI De-yi ZHOU Ling-ping College of Materials Science and Engineering Hunan University Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University

ISBN: (纸本)9783037859698

In the present work,the finite element method is employed to predict the effective thermal conductivity of diamond particle reinforced aluminum *** common finite element commercial software ANSYS is used to for this numerical analysis.A body-centered cubic particle arrangement model are constructed to simulate the microstructure of the composite with 60 vol.%*** effect of particle size and inhomogeneous interfacial conductance on the thermal conductivity of diamond particles reinforced aluminum composite is ***-octahedral particles are assumed and interfacial thermal conductance between different diamond faces and aluminum matrix is implemented by real constants of contact *** results show that the numerical results using present model agree reasonably well with the *** into consideration the interfacial thermal conductance,the influence of particle size on total thermal conductivity of composite is obvious,the larger size particles tend to meet requirement of the high thermal conductivity of *** the experimental result with the inhomogeneous interfacial thermal conductance model,the evolution of the composite thermal property is profound studied.

关键词： Finite element method Composite materials Thermal properties Interfaces

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Three-Component Synthesis of 2-Heteroaryl-3-hydroxybenzo[b]- thiophenes under Transition-Metal-Free Conditions

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Chinese Journal of Chemistry 2021年第9期39卷 2483-2488页

作者： Dahan Wang Fuhong Xiao Feng Zhang Guo-Jun Deng Key Laboratory for Green Organic Synthesis and Application of Hunan Province Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtanHunan 411105China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhouGuangdong 510640China

A convenient synthetic route to 2-heteroaryl-3-hydroxybenzo[b]thiophene derivatives via K_(2)CO_(3)-promoted multicomponent cycliza-tion between o-halogenated benzaldehyde,2-methylquinolines and sulfur powder has been *** reaction is performed smoothly under simple conditions to give the corresponding products in moderate to good *** resultant 3-hydroxybenzo[b]thiophenes have been proved to be versatile building blocks in a range of transition-metal-catalyzed cross-coupling reactions.

关键词： Benzothiophenes Transition-metal-free C-H activation Sulfur Multicomponent reactions

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A novel strategy for in situ maskless synthesis of biochips:Self-driving micro-fluid porous type printing (SMPTP)

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Chinese Chemical Letters 2007年第1期18卷 111-114页

作者： Nong Yue He Ya Fei Guo Song Li Jian-Xin Tang State Key Laboratory of Bioelectronics Southeast University Nanjing 210096 China Key Laboratory of Green-Packaging and Application of Bionanotechnology of Hunan Province Zhuzhou Institute of Technology Zhuzhou 412008 China

A novel maskless technique, self-driving micro-fluid porous type printing （SMPTP）, was reported to in situ synthesize oligonucleotide arrays on glass slide, which has the merits of low cost, high quality and simple craft. In SMPTP for fabricating gene- chips, porous fiber tubes with a number of nanometric or micron channels functioned as ＂active letters＂ and were assembled in designed patterns, which are identical to the distribution of monomers in each layer of the array, and four patterns were needed for each layer. By means of capillarity, the synthesis solution was automatically taken into porous tubes assembled in a printing plate and reached the surface. An oligonucleotide array of 160 features with four different 15-mer probes was in situ synthesized using this technique. The four specific oligonucleotide probes, including the matched and the mismatched by the fluorescent target sequence, gave obviously different hybridization fluorescent signals.

关键词： Typography Oligonucleotide In situ synthesis DNA microarrays Biochips

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An analytical solution of the subsequent drawing force on multistage deep drawing of cylindrical cup 14th

An analytical solution of the subsequent drawing force on mu...

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14th Asia-Pacific Symposium on Engineering Plasticity and its applications, AEPA 2018

作者： Lin, Qiquan Wang, Zhenzhu Peng, Yanrong Hu, Chengwu Dong, Wenzheng Wang, Yingle Key Laboratory of Robot and Application Technology of Hunan Province Xiangtan University Hunan Xiangtan411105 China School of Mechanical Engineering Hunan University of Technology Hunan Zhuzhou412007 China

ISBN: (纸本)9783035713626

In multistage deep drawing process, the subsequent drawing force(SDF) is a key reference value, which plays a significant role on the practical die structure design. In the present study, an analytical calculation of the radial stress at the die exit as well as the SDF in cylindrical cup drawing process are proposed, considering the previous strain hardening in the first drawing, normal anisotropy, frictional coefficient and die arc radius. As a result, the calculated maximum subsequent drawing force (MSDF) is in good agreement with the experimental result. Besides, the MSDF decreases as normal anisotropy value increases, while increases as frictional coefficient and strain hardening exponent increases respectively. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Strain hardening

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Field measurements for calibration of simplified models of the stiffening effect of infill masonry walls in high-rise RC framed and shear-wall buildings

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 87-104页

作者： Zhou Yun Pei Yilin Zhou Yi Hyeon-Jong Hwang Yi Weijian College of Civil Engineering Hunan UniversityChangsha 410082China Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures Hunan UniversityChangsha 410082China Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province Hunan UniversityChangsha 410082China

As a type of nonstructural component, infill walls play a significant role in the seismic behavior of high-rise buildings. However, the stiffness of the infill wall is generally either ignored or considered by simplified empirical criteria that lead to a period shortening. The difference can be greatly decreased by using a structural identification methodology. In this study, an ambient vibration test was performed on four on-site reinforced concrete high-rise buildings, and the design results were compared with the PKPM models using corresponding finite element(FE) models. A diagonal strut model was used to simulate the behavior of the infill wall, and the identified modal parameters measured from the on-site test were employed to calibrate the parameters of the diagonal strut in the FE models. The SAP2000 models with calibrated elastic modulus were used to evaluate the seismic response in the elastic state. Based on the load-displacement relationship of the infill wall, nonlinear dynamic analysis models were built in PERFORM-3 D and calibrated using the measured modal periods. The analysis results revealed that the structural performance under small/large earthquake records were both strengthened by infill walls, and the contribution of infill walls should be considered for better accuracy in the design process.

关键词： high-rise building ambient vibration test model calibration infi ll wall seismic performance nonlinear dynamic analysis

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Protection effect for polymer-in rich phase in SBS modified asphalt during long-term aging by different MMT/TiO 2 /SBS pretreatment methods

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Fuel 2025年 400卷

作者： Chongzheng Zhu Zhenxuan Sun Fu Xu Henglong Zhang Xiaogang Guo Key Laboratory of Geotechnical Mechanics and Engineering Safety of Hunan Province College of Civil Engineering Xiangtan University Xiangtan 411105 China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha 410082 China Larson Transportation Institute Pennsylvania State University University Park PA 16802 USA

To realize the precise protection for polymer-in rich phase (PRP) in Styrene-Butadiene-Styrene (SBS) modified asphalt during long-term aging, the influence of different pretreatment methods (mechanical stirring and microwave treatments) of organic montmorillonite (MMT)/nanometer titania (TiO 2 )/SBS on long-term thermal-oxidative and ultraviolet (UV) aging resistance of SBS modified asphalt (SBSMA) were investigated. Long-term thermal-oxidative aging was simulated using a pressure aging vessel, while UV aging was performed in a UV aging chamber. Rheological properties were assessed using a dynamic shear rheometer with linear amplitude sweep test, and micro characteristics were analyzed using Fourier transform infrared spectroscopy and fluorescence microscopy tests. The results showed that both mechanical stirring and microwave treatments could contribute to the interaction between MMT/TiO 2 and SBS modifier, improve the compatibility of SBS modifier and asphalt, and enhance the fatigue life of SBSMA after long-term thermal-oxidative and UV aging. Compared with the MMT/TiO 2 /SBS modified asphalt without pretreatment, these two pretreatment methods can not only reduce the formation of carbonyl in SBSMA during long-term aging, but also effectively retard the degradation of SBS modifier, and then protect the PRP feature of SBSMA from disappearing. Moreover, after the surface modification of TiO 2 with a silane coupling agent, the effect of microwave treatment is enhanced further. These findings will be conducive to developing a new anti-aging design method of SBSMA.

关键词： Fourier transform infrared spectroscopy

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Schiff-base polymer derived FeCo-N-doped porous carbon flowers as bifunctional oxygen electrocatalyst for long-life rechargeable zinc-air batteries

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Journal of Energy Chemistry 2023年第1期76卷 470-478,I0012页

作者： Yusong Deng Jiahui Zheng Bei Liu Huaming Li Mei Yang Zhiyu Wang College of Chemistry Xiangtan UniversityXiangtan 411105HunanChina Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education Key Laboratory of Polymeric Materials&Application Technology of Hunan ProvinceKey Laboratory of Advanced Functional Polymeric Materials of College of Hunan ProvinceXiangtan UniversityXiangtan 411105HunanChina State Key Lab of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringPSU-DUT Joint Center for Energy ResearchSchool of Chemical Engineering Dalian University of TechnologyDalian 116024LiaoningChina

Rational design and exploration of low-cost and robust bifunctional oxygen electrocatalysts are vitally important for developing high-performance zinc-air batteries(ZABs).Herein,we reported a facile yet cost-efficient approach to construct a bifunctional oxygen reduction reaction(ORR)/oxygen evolution reaction(OER)electrocatalyst composed of N-doped porous carbon nanosheet flowers decorated with Fe Co nanoparticles(Fe Co/N-CF).Rational design of this catalyst is achieved by designing Schiff-base polymer with unique molecular structure via hydrogen bonding of cyanuramide and terephthalaldehyde polycondensate in the presence of metal *** exhibits excellent activity and stability for electrocatalysis of ORR/OER,enabling ZAB with a high peak power density of 172 m W cm^(-2)and a large specific capacity of 811 m A h g^(-1)Znat large *** rechargeable ZAB demonstrates excellent durability for 1000 h with slight voltage decay,far outperforming a couple of precious Pt/Ir-based *** functional theory(DFT)calculations reveal that high activity of bimetallic Fe Co stems from enhanced O_(2)and OH-adsorption and accelerated O_(2)dissociation by OAO bond activation.

关键词： Rechargeable zinc-air batteries Oxygen electrocatalyst Schiff-base polymer Bimetallic FeCo N-doped porous carbon

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Carbon encapsulated magnetic nanoparticles produced by hydrothermal reaction

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Chinese Chemical Letters 2007年第4期18卷 487-490页

作者： Nong Yue He Ya Fei Guo Yan Deng Zhi Fei Wang Song Li Hong Na Liu State Key Laboratory of Bioelectronics Southeast University Nanjing 210096 China b Key Laboratory of Green-Packaging and Application of Bionanotechnology of Hunan Province Zhuzhou Institute of Technology Zhuzhou 412008 China

Carbon encapsulated magnetic nanoparticles （CEMNs） were synthesized by heating an aqueous glucose solution containing Fe-Au （Au coated Fe nanoparticles） nanoparticles at 160-180 ℃ for 2 h. This novel hydrothermal approach is not only simple but also provides the surface of CEMNs with functional groups like--OH. The formation of carbon encapsulated magnetic nanoparticles was not favored when using pure Fe nanoparticles as cores because of the oxidation of Fe nanoparticles by 1-120 during the reaction and, therefore, the surfaces of the naked Fe nanoparticles had to be coated by Au shell in advance. TEM, XRD, XPS and VSM measurments characterized that they were uniform carbon spheres containing some embedded Fe-Au nanoparticles, with a saturation of 14.6 emu/g and the size of the typical product is -350 nm.

关键词： Carbon encapsulated magnetic nanoparticles Hydrothermal reaction Gold shell

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