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A Spiral Graphene Framework Containing Highly Ordered Graphene Microtubes for Polymer composites with Superior Through-Plane Thermal Conductivity

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Chinese Journal of Chemistry 2022年第3期40卷 329-336页

作者： Jinrui Gong Xue Tan Qilong Yuan Zhiduo Liu Junfeng Ying Le Lv Qingwei Yan Wubo Chu Chen Xue Jinhong Yu Kazuhito Nishimura Nan Jiang Cheng-Te Lin Wen Dai key laboratory of Marine materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and Engineering(NIMTE)Chinese Academy of SciencesNingboZhejiang 315201China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBejjing 100049China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)Beijing Key Lab of Nonophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China College of materials Science and Engineering Hunan UniversityChangshaHunan 410082China Advanced Nano-processing Engineering Lob Mechanical Systems EngineeringKogakuin UniversityTokyo 192-0015Japan

As the power density of electronic devices increases,there has been an urgent demand to develop highly conductive polymer composites to address the accompanying thermal management *** to the ultra-high intrinsic thermal conductivity,graphene is considered a very promising filler to improve the thermal conductivity of ***,graphene-based polymer composites prepared by the conventional mixing method generally have limited thermal conductivity,even under high graphene loading,due to the failure to construct efficient heat transfer pathways in the polymer ***,a spiral graphene framework(SGF)containing continuous and highly ordered graphene microtubes was developed based on a modified CVD *** embedding into the epoxy(EP)matrix,the graphene microtubes can act as efficient heat pathways,endowing the SGF/EP composites with a high through-plane thermal conductivity of 1.35 W·m^(-1)·K^(-1) at an ultralow graphene loading of 0.86 wt%.This result gives a thermal conductivity enhancement per 1 wt%filler loading of 710%,significantly outperforming various graphene structures as *** addition,we demonstrated the practical application of the SGF/EP composite as a thermal interface material for efficient thermal man-agement of the light-emitting diode(LED).

关键词： Graphene Chemical vapor deposition Polymer Thermal conductivity Thermal management material

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Fabrication of biomaterial/TiO2 composite photocatalysts for the selective removal of trace environmental pollutants

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1416-1428页

作者： Yilin Zhao Yaoqiang Wang Gang Xiao Haijia Su beijing key laboratory of Bioprocess Beijing Advanced Innovation Center for Soft Matter Science and Engineering(BAIC-SM)Beijing University of Chemical Technology

Trace environmental pollutants have become a serious problem with special attention on the hazardous heavy metals, refractory organics, and pathogenic microorganisms. With coupling biosorption and photocatalysis to develop biomaterial/TiO2 composite photocatalysts is a promising method to remove these trace pollutants because of the synergistic effect. Biomaterials provide multiple function groups which can selectively and efficiently enrich trace pollutants onto the surface of the photocatalysts, thus facilitating the following transformation mediated by TiO2 photocatalysis. Biomaterials can also help the dispersion and recovery of TiO2, or even modify the band structure of TiO2. The fabrication of chitosan/TiO2, cellulose/TiO2, as well as other biomaterial/TiO2 composite photocatalysts is discussed in detail in this review. The application significance of these composite photocatalysts for the selective removal of trace pollutants is also addressed. Several problems should be solved before the realistic applications can be achieved as discussed in the final section.

关键词： Biomaterial TiO2 composite photocatalysts Trace pollutants

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A HEA/MG composite breaks the strength-ductility trade-off by using ultrasonic technology

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Science China(Technological Sciences) 2020年第10期63卷 2169-2170页

作者： ZHANG Yong LI RuiXuan beijing Advanced Innovation Center of materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Qinghai Provincial key laboratory of New Light Alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and FormingQinghai UniversityXining 810016China

Metallic glasses(MGs)have aroused wide concern for their high strength,large elastic-strain limit and excellent wearresistance,while their applications as the structural materials are severely limited by their room-temperature *** crystalline in MGs have been used as dendrite/MG composite to improve the plasticity,and nowadays the high entropy alloys(HEAs)emerge from the crystalline alloys with more and more attention for their novel design principles and special properties[1,2].

关键词： strength alloys ductility

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Effect of processing parameters on the microstructure and mechanical properties of TiAl/Ti_(2)AlNb laminated composites

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Journal of materials Science & Technology 2022年第14期109卷 228-244页

作者： Donghai Li Binbin Wang Liangshun Luo Xuewen Li Yanjin Xu BinQiang Li Diween Hawezy Liang Wang Yanqing Su Jingjie Guo Hengzhi Fu National key laboratory for Precision Hot Processing of Metals School of Materials Science&EngineeringHarbin Institute of TechnologyHarbin 150001China key laboratory for Lightweight materials Nanjing Tech UniversityNanjing 211816China AVIC Manufacturing Technology Institute Beijing 100024China materials Research Centre College of EngineeringSwansea UniversityBay CampusSwansea SA18ENUK

In order to improve the intrinsic brittleness of TiAl alloys,Ti_(2)AlNb alloys with outstanding ductility and toughness at room temperature,and good high-temperature performance are competitive candidates in constructing the TiAl-based laminated *** this work,TiAl/Ti_(2)AlNb laminated composites are successfully synthesized by vacuum hot pressing combined with the foil-foil(sheet)*** the pressure of 65 MPa,different holding time and temperature of hot pressing are tried and the optimized fabrication parameter is acquired as 1050℃/120 min/65 *** with the changes of processing parameters,the defect,microstructure,interface,phase transformation and the corresponding mechanical properties are detailly *** results show that the TiAl/Ti_(2)AlNb laminated composite fabricated at 1050℃ for 2 h achieves a good metallurgical interface *** corresponding interface microstructure is composed of region I and region *** region I consists of O,α_(2)and B2/βphase,and region II is made up ofα***,the tensile tests indicate that the composite synthesized at 1050℃ for 2 h possesses a maximum strength of 812 MPa and a total elongation of 1.31%at room temperature,and a strength of 539.71 MPa and the highest total elongation of 10.34%at 750℃.The well synergistic deformation ability between the interface and the two base alloys endows the composite an excellent tensile ***,the composite processed at 1050℃ for 2 h behaves the best fracture toughness in both arrester orientation and divider orientation with the value of 32.6 MPa.m^(1/2)and 30.1 MPa.m^(1/2),*** Ti_(2)AlNb alloy in the laminated structure effectively release the stress around the crack tip and plays a role in ***,crack deflection,crack bridging,crack blunting and fragmentation also make contributions to enhance the fracture toughness of the laminated composites.

关键词： TiAl/Ti_(2)AlNb laminated composite Hot pressing Processing parameters Microstructure Mechanical properties Fracture

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Efficient oil-water separation by novel biodegradable all cellulose composite filter paper

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Green Energy & Environment 2023年第6期8卷 1673-1682页

作者： Chizhou Wang Shaodi Wu Ning Zhang Zhaoli Jiang Xianglin Hou Long Huang Tiansheng Deng Shanxi Engineering Research Center of Biorefinery Institute of Coal ChemistryChinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China key laboratory of China Research Institute of Daily Chemistry Co. Ltd.Sinolight CorporationTaiyuan030001China CAS key laboratory of Carbon materials Institute of Coal ChemistryChinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China beijing key laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology Beijing Institute of Petrochemical TechnologyBeijing102617China

Industrial production and domestic discharge produce a large amount of oily wastewater, which seriously affects the stability of the ecological environment. Membrane separation technology provides another path to treating oily wastewater. And appropriate surface modification of the membrane helps to achieve high efficiency of treating oily wastewater. With green, economy and stability been more *** focal research reports a completely biodegradable all cellulose composite filter paper(ACCFP) composed of Ⅰ-cellulose macrofibers and Ⅱ-cellulose matrix. It is a simple one-step impregnation method to adjust the surface microstructure of the pristine filter paper(PFP), and it does not involve with chemical reaction. The pre-wetted ACCFP consist of Ⅱ-cellulose hydrogel and Ⅰ-cellulose reinforcement in the process of oil-water separation. This layer of hydrogel is the fundamental to underwater superoleophobicity, which determines their eligibility for applications of efficient oil-water mixture or oil-in-water(oil/water) emulsion separation. The separation efficiency of oil-water mixture and oil/water emulsion exceed 95% and 99.9%, respectively. In addition, excellent mechanical properties of ACCFP in dry and wet conditions ensure its stability in service and prolong service life in applications. The focal study provides a new method for high-performance oil-water separation and it is more in line with sustainable chemistry.

关键词： All cellulose composite filter paper Pristine filter paper Oil in water separation Underwater superoleophobic property

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Novel CoAl-LDH Nanosheets/BiPO_(4) nanorods composites for boosting photocatalytic degradation of phenol

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Petroleum Science 2022年第6期19卷 3080-3087页

作者： Ya-Jun Wang Jia-Ying Zhang Shuang-Shuang Hou Jia-Xing Wu Cong Wang Yu-Ming Li Gui-Yuan Jiang Guo-Qing Cui State key laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China

Layered double hydroxide(LDH)with special layered structure has been proved to have excellent hole transport capacity and good ***,we report a high efficient composite photocatalyst of CoAlLDH and BiPO4prepared by hydrothermal and che mical adsorption(denoted as CoAl-LDH/BiPO_(4)).Phenol can be entirely degraded by 1%CoAl-LDH/BiPO_(4)under 30 min ultraviolet(UV)light irradiation,and the degradation rate constants k are 3 times and 39 times higher than that of pure BiPO_(4)and CoAl-LDH,*** enhanced photocatalytic activity can be attributed to effective holes transfer from BiPO4to CoAl-LDH,which hinders the recombination of photo genera ted charge *** addition,the combination of BiPO4and CoAl-LDH avoids the agglomeration of BiPO4and improves the stability of BiPO_(4).Active species capture experiments indicate that superoxide radicals(·O-_(2))are the main active species responsible for the degradation of *** work provides technical approaches and research ideas for solving the photogenerated charge carrier recombination problem of photocatalyst.

关键词： BiPO_(4) CoAl-LDH Photocatalytic degradation Phenol

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EXPERIMENTAL STUDY ON PEK -C MODIFIED EPOXIES AND THE CARBON FIBER compositeS FOR AEROSPACE APPLICATION

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Chinese Journal of Aeronautics 2000年第4期13卷 242-249页

作者：李暘暘益小苏唐邦明 Natl. key Lab. of Adv. composites Beijing Inst. of Aero. Materials Beijing 100095 China

The morphological structure of various epoxies toughened with a special amorphous thermoplastic PEK-C and their carbon fiber composites were studied by using SEM. For both cases, phase separation and inversion took place to form fine epoxy-rich globules dispersing in the PEK-C matrix, in which the epoxy-rich phase had the absolutely higher volume fraction. The phase structure and the interfacial properties were also studied by means of FTIR, DSC, and DMTA as well. An accompanying mechanical determination revealed that an improved toughness was achieved both in the blend casts and in the carbon fiber composites. A composite structural model was hence suggested.

关键词： PEK-C thermoset/thermoplastic binary system phase behavior interface toughness carbon fiber composites

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Application of polarized light microscopy on microstructural characterization of semisolid slurry

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Rare Metals 2023年第10期42卷 3545-3552页

作者： Xiao-Kang Liang Qiang Zhu Min Luo Da-Quan Li National Engineering Research Center for composite materials General Research Institute for Nonferrous MetalBeijing100088China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China

In this paper,two ways of micro structural characterization,optical microscopy(OM) and polarized light microscopy(PLM),were both employed to describe the micro structure of semisolid slurry prepared by swirling enthalpy equilibration device(SEED).The results show that PLM is more reliable and accurate than OM to describe the special morphology feature of semisolid slurry made by SEED ***,the effects of pouring temperature and mass of molten liquid on the primary α-Al particle size and morphology were also investigated using *** quantitative metallographic results measured from PLM demonstrate that the grain size and morphology and their distribution are significantly affected by both pouring temperature and the mass of molten *** grain size poured with 2.7 kg liquid decreases from 659 to186 μm,and grain morphology transforms from dendrite to globular structure with pouring temperature reducing from690 to 630℃.The decreasing pouring temperature also promotes the distribution of spherical structure on the cross ***,the mass of molten liquid decreasing from 2.7 to 2.3 kg can decrease the grain size by maximum of 44% at high pouring temperature.

关键词： Semisolid Microstructural characterization Polarized light microscopy Pouring temperature Mass of liquid

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A thermoresponsive composite separator loaded with paraffin@SiO_(2) microparticles for safe and stable lithium batteries

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Journal of Energy Chemistry 2021年第11期30卷 423-430,I0009页

作者： Hao Dong Peican Wang Shuaishuai Yan Yingchun Xia Baoguo Wang Xiaolin Wang Kai Liu The State key laboratory of Chemical Engineering Department of Chemical EngineeringTsinglma UniversityBeijing 100084China

Lithium-ion batteries (LIBs)-related accidents have been reported for years and safety issues are stumbling blocks for the practical applications of lithium metal batteries (LMBs) with higher energy density. More effective strategies to shut down the battery at the early stage of thermal runaway with less side effects on the electrochemical performance are greatly desired. In this work, the core–shell structural paraffin@SiO_(2) microparticles were synthesized by in situ emulsion interfacial hydrolysis and polycondensation and the paraffin@SiO_(2)-loaded separator (PSS) was prepared by a facile filtration method. The introduction of hydrophilic silica shells in paraffin@SiO_(2) enhanced the wettability of carbonate electrolyte with the composite separator and improved the processability of soft paraffin. As a result, when used in LMBs at room temperature, the cell with PSS inside had a more uniform deposition of lithium, a much lower overpotential and a more stable electrochemical performance than the cell with the blank separator or the conventional pure paraffin-loaded separator inside. More significantly, when a heating stimulation (i.e. 115 ℃) was subjected to the cell with PSS inside, the paraffin in the core of paraffin@SiO_(2) could be released, blocking the gaps between particles and the pores in the separator and efficiently stopping the transportation of Li+ between two electrodes, resulting in the thermally-induced shutdown of the cell below the melting temperature of PE (~135 ℃) in the Celgard2325 separator. The core–shell structure of paraffin@SiO_(2) enables the maintaining of each component’s benefits while avoiding each one’s drawbacks by elaborating microstructural design. Therefore, the conventional dilemma between the electrochemcial performance and safety of LMBs could be solved in the future.

关键词： Thermally-induced shutdown Separator Paraffin@SiO_(2) Lithium batteries Safety Wettability

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Stretchable polymer composites with ultrahigh piezoelectric performance

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National Science Review 2023年第8期10卷 203-210页

作者： Tongxiang Tang Zhonghui Shen Jian Wang Shiqi Xu Jiaxi Jiang Jiahui Chang Mengfan Guo Youjun Fan Yao Xiao Zhihao Dong Houbing Huang Xiaoyan Li Yihui Zhang Danyang Wang Long-Qing Chen Ke Wang Shujun Zhang Ce-Wen Nan Yang Shen State key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University State key laboratory of Advanced Technology for materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Applied Mechanics laboratory Department of Engineering Mechanics Tsinghua University Center for Flexible Electronics Technology Tsinghua University School of materials Science and Engineering University of New South Wales Department of materials Science and Engineering The Pennsylvania State University State College Institute for Superconducting and Electronic materials Australian Institute for Innovative MaterialsUniversity of Wollongong

Flexible piezoelectric materials capable of withstanding large deformation play key roles in flexible electronics. Ferroelectric ceramics with a high piezoelectric coefficient are inherently brittle, whereas polar polymers exhibit a low piezoelectric coefficient. Here we report a highly stretchable/compressible piezoelectric composite composed of ferroelectric ceramic skeleton, elastomer matrix and relaxor ferroelectric-based hybrid at the ceramic/matrix interface as dielectric transition layers, exhibiting a giant piezoelectric coefficient of 250 picometers per volt, high electromechanical coupling factor keff of 65%,ultralow acoustic impedance of 3MRyl and high cyclic stability under 50% compression strain. The superior flexibility and piezoelectric properties are attributed to the electric polarization and mechanical load transfer paths formed by the ceramic skeleton, and dielectric mismatch mitigation between ceramic fillers and elastomer matrix by the dielectric transition layer. The synergistic fusion of ultrahigh piezoelectric properties and superior flexibility in these polymer composites is expected to drive emerging applications in flexible smart electronics.

关键词： polymer composites piezoelectric materials structure design flexible electronics

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