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Sintering time influences on microstructure and electrical properties of scandium doped zinc oxide varistor ceramics

2011年全国压电和声波理论及器件应用研讨会

作者： dong xu~(1,2,3,*) Juan ZHANG~1 yongfang chen~1 1 school of material science and engineering,jiangsu university,zhenjiang 212013 2 state key laboratory of electrical insulation and power equipment,xi’an jiaotong university, xi’an 710049 3 state key laboratory of new ceramic and fine processing,tsinghua university,beijing 100083

CaCuTiO(CCTO) ceramics doped with different proportions of EuO dopant(w%,x=0,0.40%,0.80%,0.12%, 0.18%) are prepared by the traditional solid-state reaction *** and XRD are used in the microstructural studies of the specimens;at the same time,the electrical properties andⅤ-Ⅰcharacteristics of the varistor ceramics samples were investigated by a DC parameter instrument for *** analysis of the samples shows that the

关键词： CaCu3Ti4O12 Rare earth Dielectric properties Varistor Microstructure

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Sintering time influences on microstructure and electrical p...

A Self-Healing Elastomer with Extremely High Toughness Achieved by Acylsemicarbazide Hydrogen Bonding and Cu^(2+)-Neocuproine Coordination Interactions

2011年全国压电和声波理论及器件应用研讨会

作者： dong xu~(1,2,3,*)Bin JIANG~1 Yan ZHAO~1 1 school of material science and engineering,jiangsu university,zhenjiang 212013 2 state key laboratory of electrical insulation and power equipment,xi’an jiaotong university, xi’an 710049 3 state key laboratory of new ceramic and fine processing,tsinghua university,beijing 100083

ScO-doped zinc oxide varistor ceramics were prepared by using a solid reaction route,microstructure and electrical properties was analyzed by scanning electron microscope and X-ray *** time influences the microstructu... 详细信息

关键词： Varistors Zinc oxide Sintering time Electric properties Microstructure

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Chinese Journal of Polymer science 2024年第10期42卷 1425-1434,I0007页

作者： xiao-Ming An Yi-Ping Wang Tang-song Zhu Chong xing xu-dong Jia Qiu-Hong Zhang key laboratory of High Performance Polymer material and Technology of MOE Department of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210093China state key laboratory of Coordination Chemistry Nanjing UniversityNanjing210093China

Elastomers with high mechanical toughness can guarantee their durability during service ***-healing ability,as well as recyclability,can also extend the life of materials and save the consuming cost of the *** efforts have been dedicated to promoting the mechanical toughness as well as the self-healing capability of elastomers at the same time,while it remains a challenge to balance the trade-off between the above properties in one *** we proposed a molecular design driven by dual interactions of acylsemicarbazide hydrogen bonding and Cu^(2+)-neocuproine coordination *** introducing the reversible multiple hydrogen bonds and strong coordination bonds,we successfully fabricated an extremely tough and self-healing *** elastomer can achieve an impressive top-notch toughness of 491 MJ/m^(3).Furthermore,it boasted rapid elastic restorability within 10 min and outstanding crack tolerance with high fracture energy(152.6kJ/m^(2)).Benefiting from the combination of dynamic interactions,the material was able to self-repair under 80℃conveniently and could be reprocessed to restore the exceptional mechanical properties.

关键词： Metal-ligand coordination Hydrogen bond Ultra-tough elastomer Self-healing

Paleontology Knowledge Graph for Data-Driven Discovery

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Journal of Earth science 2024年第3期35卷 1024-1034页

作者： Yiying Deng Sicun song Junxuan Fan Mao Luo Le Yao Shaochun dong Yukun Shi Linna Zhang Yue Wang Haipeng xu Huiqing xu Yingying Zhao Zhaohui Pan Zhangshuai Hou xiaoming Li Boheng Shen xinran chen Shuhan Zhang xuejin Wu Lida xing Qingqing Liang Enze Wang school of Resources and Environmental engineering Hefei University of TechnologyHefei 230009China state key laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008China school of Earth sciences and engineering and Frontiers science Center for Critical Earth material Cycling Nanjing UniversityNanjing 210023China state key laboratory for Mineral Deposits Research Nanjing UniversityNanjing 210023China university of Chinese Academy of sciences Beijing 100049China key laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China Centre for Research and Education on Biological Evolution and Environment Nanjing UniversityNanjing 210023China state key laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China school of the Earth sciences and Resources China University of GeosciencesBeijing 100083China

A knowledge graph(KG)is a knowledge base that integrates and represents data based on a graph-structured data model or *** have made efforts to construct geosciencerelated KGs to overcome semantic heterogeneity and facilitate knowledge representation,data integration,and text ***,there is currently no comprehensive paleontology KG or data-driven discovery based on *** this study,we constructed a two-layer model to represent the ordinal hierarchical structure of the paleontology KG following a top-down construction *** ontology containing 19365 concepts has been defined up to *** this basis,we derived the synonymy list based on the paleontology KG and designed corresponding online functions in the OneStratigraphy database to showcase the use of the KG in paleontological research.

关键词： paleontology knowledge graph ontology synonymy list OneStratigraphy big data ge-ology.

Finite-temperature ductility-brittleness and electronic structures of Al_(n)Sc(n=1,2 and 3)

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Rare Metals 2024年第8期43卷 3974-3989页

作者： xue-Qian Wang Ying Zhao Hao-xuan Liu Shu-chen Sun Hong-Bo Yang Jia-Min Zhong Gan-Feng Tu song Li Yu-dong Zhang Claude Esling Hai-Le Yan Liang Zuo key laboratory for Anisotropy and Texture of materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China school of Metallurgy Northeastern UniversityShenyang 110819China Rare Earth Functional materials(xiong'an)Innovation Center Co. Ltd.Xiong'an 071700China Laboratoire d'étude des Microstructures et de Mécanique des Matériaux(LEM3) Unikersitéde Lorraine57045MetzFrance

Finite-temperature ductility-brittleness and electronic structures of Al_(3)Sc,Al_(2)Sc and AlSc are studied comparatively by first-principles calculations and ab initio molecular *** show that Al_(3)Sc and Al_(2)Sc are brittle at both ground state and finite temperatures,while AlSc possesses a significantly superior *** ground state,AlSc is ductile from Pugh's and Poisson's criteria,while it is brittle in Pettifor's *** ductility of all Al_(3)Sc,Al_(2)Sc and AISc improves greatly with the elevated ***,the Cauchy pressure of AlSc undergoes a transition from negative to *** T>600 K,AlSc is unequivocally classified as ductile from all criteria *** all compounds,the Al-Al bond originated from s-p and p-p orbital hybridizations,and the Al-Sc bond dominated by p-d covalent hybridization,are the first and second strongest chemical bonds,*** explain the difference in mechanical properties,the mean bond strength(MBS)is introduced in this *** weaker Al-Al bond in AlSc,leading to a smaller MBS,could be the origin of the softer elastic stiffness and superior intrinsic *** longer length of the Al-Al bond in AlSc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional *** longer length of the Al-Al bond in AISc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional ductility.

关键词： Al-Sc Target materials Intrinsic ductility Finite-temperature elastic constant First-principles calculation

Facile and effective synthesis strategy for terbium-doped hydroxyapatite toward photoelectric devices and flexible functional fibers

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Rare Metals 2024年第4期43卷 1713-1723页

作者： xiao-dong Zhang Kun Nie Zi-Yao Hu Ran-Ran Zhou xiu-Qiang Duan Wu-Bin Dai song-song Nie song-Jun Yao Luo-xin Wang Le-Fu Mei Hua Wang Yi-Yi Yao xiao-xue Ma Hubei key laboratory for new Textile materials and Applications and state key laboratory of new Textile materials and Advanced processing Technology School of Materials Science and EngineeringWuhan Textile UniversityWuhan430200China key laboratory of Testing and Tracing of Rare Earth Products for state Market Regulation Jiangxi University of Science and TechnologyGanzhou341000China Hubei key laboratory of Plasma Chemistry and Advanced materials and key laboratory of Green Chemical engineering Process of Ministry of Education Wuhan Institute of TechnologyWuhan430205China

As a material with good biocompatibility,hydroxyapatite(HAP)can have optical properties after doping with various rare earth *** a biocompatible fluorescent material,doped HAP could have broad applications in biological probes,drug delivery,optoelectronic materials,fluorescence anti-counterfeiting,and other *** this paper,we put forward the preparation of HAP doped with terbium(Ⅲ)ions(Tb^(3+))by hydrothermal *** controlling the Tb^(3+)doping content in reaction and the reaction time,the changes in HAP's structure,morphology,and luminescence properties under different conditions were *** the doping amount of Tb^(3+)reached an optimal value,the dipole-quadrupole would occur and the concentration would be *** control experiment showed that the optimal Tb3+content was 7.5×10^(-5)mol,which showed the best fluorescence ***,a non-luminous material,was rarely used in the field of fluorescent anti-counterfeiting and photoelectric *** proposed to prepare a luminescent aramid/polyphenylene sulfide(ACFs/PPS)fiber paper and a new light-emitting diode(LED)using the Tb-doped HAP *** composite sample exhibited an excellent stability and fluorescence performance,which also demonstrated a possibility of HAP applications in anticounterfeiting and *** introduction of Tb3+dopant HAP was done to give HAP optical properties and broaden the application range of HAP.

关键词： Hydroxyapatite Rare earth luminescence Photoelectric device Aramid Polyphenylene sulfide fiber paper Luminescent fiber

Thermal pretreatment of willow branches impacts yield and pore development of activated carbon in subsequent activation with ZnCl_(2) via modifying cellulose structure

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Chinese Journal of Chemical engineering 2024年第5期69卷 227-237页

作者： Linghui Kong Chao Li Runxing Sun Shu Zhang Yi Wang Jun xiang song Hu dong Wang Chuanjun Leng xun Hu school of material science and engineering University of JinanJinan 250022China Joint International Research laboratory of Biomass Energy and materials College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China state key laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China Shandong BASAN Graphite new material Plant Zibo 255311China

Development of pore structures of activated carbon(AC)from activation of biomass with ZnCl_(2) relies on content and structure of cellulose/hemicellulose in the *** pretreatment of biomass could induce dehydration and/or aromatization to change the structure of cellulose/*** might interfere with evolution of structures of AC,which was investigated herein via thermal pretreatment of willow branch(WB)from 200 to 360℃and the subsequent activation with ZnCl_(2) at 550℃.The results showed that thermal pretreatment at 360℃(WB-360)could lead to substantial pyrolysis to form biochar,with a yield of 31.9%,accompanying with nearly complete destruction of cellulose crystals and remarkably enhanced aromatic ***,cellulose residual in WB-360 could still be activated to form AC-360 with specific surface area of 1837.9 m~2·g^(-1),which was lower than that in AC from activation of untreated WB(AC-blank,2077.8 m~2·g^(-1)).Nonetheless,the AC-200 from activation of WB-200 had more developed pores(2113.9 m~2·g^(-1))and superior capability for adsorption of phenol,due to increased permeability of ZnCl_(2) to the largely intact cellulose structure in *** thermal pretreatment did increase diameters of micropores of AC but reduced the overall yield of AC(26.8%for AC-blank versus 18.0%for AC-360),resulting from accelerated cracking but reduced intensity of ***-situ infrared characterization of the activation showed that ZnCl_(2) mainly catalyzed dehydration,dehydrogenation,condensation,and aromatization but not cracking,suppressing the formation of derivatives of cellulose and lignin in *** thermal pretreatment formed phenolic-OH and C=O with higher chemical innerness,which changed the reaction network in activation,shifting morphology of fibrous structures in AC-blank to“melting surface”in AC-200 or AC-280.

关键词： Thermal pretreatment Activation with ZnCl_(2) Willow branch Activated carbon Biochar

Polyphenol-mediated interfacial deposition strategy for supported manganese oxide catalysts with excellent pollutant degradation performance

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Chinese Chemical Letters 2024年第5期35卷 493-498页

作者： dong cheng Youyou Feng Bingxi Feng Ke Wang Guoxin song Gen Wang xiaoli cheng Yonghui Deng Jing Wei The key laboratory of Biomedical Information engineering of Ministry of Education State Key Lab of Transducer TechnologySchool of Life Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China school of Environmental and Municipal engineering Xi’an University of Architecture and TechnologyXi’an 710055China Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersState Key Laboratory of Transducer TechnologyFudan UniversityShanghai 200433China key laboratory of Functional Inorganic material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin 150080China

In persulfate-based advanced oxidation process(PS-AOPs),fixing nanosized metal oxide on processable substrates is highly desirable to avoid the aggregation and loss of nanocatalysts during the practical ***,it is still challenging to develop a versatile strategy for the deposition of metal oxide nanocatalysts on various substrates with different physicochemical ***,polyphenols are utilized as a“molecular glue”and reductant to mediate the interfacial deposition of MnO_(2) nanocatalysts on different ***_(2) nanocatalysts were in-situ grown on macroscope mineral substrates(e.g.,airstone)via an interfacial redox strategy between tannic acid(TA)and oxidized KMnO4,and then employed as a fixed catalyst of peroxymonosulfate(PMS)activation for treating pharmaceutical and personal care products(PPCPs)in *** fixed MnO_(2) exhibited superior catalytic performance toward different PPCPS via a singlet oxygen(^(1)O_(2))-dominated nonradical oxidation *** in the secondary effluent of wastewater treatment plants could be effectively removed by a fixed-bed column of the fixed MnO_(2) with long term *** cycle of Mn^(4+)/Mn^(3+)and surface hydroxyl group of the fixed MnO_(2) was proved to be responsible for the activation of *** work provides a new avenue for developing fixed metal oxides for sustainable water treatment.

关键词： Redox strategy Manganese oxides Fixed catalyst Peroxymonosulfate PPCPs

Recent progress in heterostructured materials for room-temperature sodium-sulfur batteries

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Interdisciplinary materials 2024年第4期3卷 565-594页

作者： Haobin song Yifan Li xue LLi Yixiang Li dong-sheng Li Deli Wang Shaozhuan Huang Hui Ying Yang Pillar of engineering Product Development Singapore University of Technology and DesignSingaporeSingapore key laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichangChina key laboratory of material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina key laboratory of Catalysis and Energy materials Chemistry of Ministry of Education&Hubei key laboratory of Catalysis and materials science South-Central Minzu UniversityWuhanChina

Room-temperature sodium-sulfur(RT Na-S)batteries are a promising next-generation energy storage device due to their low cost,high energy density(1274 Wh kg^(-1)),and environmental ***,RT Na-S batteries face a series of vital challenges from sulfur cathode and sodium anode:(i)sluggish reaction kinetics of S and Na_(2)S/Na_(2)S_(2);(ii)severe shuttle effect from the dissolved intermediate sodium polysulfides(NaPSs);(iii)huge volume expansion induced by the change from S to Na_(2)S;(iv)continuous growth of sodium metal dendrites,leading to short-circuiting of the battery;(v)huge volume expansion/contraction of sodium anode upon sodium plating/stripping,causing uncontrollable solid-state electrolyte interphase growth and“dead sodium”*** strategies have been proposed to address these issues,including physical/chemical adsorption of NaPSs,catalysts to facilitate the rapid conversion of NaPSs,high-conductive materials to promote ion/electron transfer,good sodiophilic Na anode hetero-interface homogenized Na ions flux and three-dimensional porous anode host to buffer the volume expansion of *** materials can combine these merits into one material to realize ***,the recent development of heterostructure as the host for sulfur cathode and Na anode has been *** of all,the electrochemical mechanisms of sulfur cathode/sodium anode and principles of heterostructures reinforced Na-S batteries are ***,the application of heterostructures in Na-S batteries is comprehensively ***,the current primary avenues of employing heterostructures in Na-S batteries are *** and prospects are put forward regarding the existing problems in current research,aiming to inspire the design of advanced and improved next-generation Na-S batteries.

关键词： heterostructured materials polysulfides shuttle effect sodiophilic Na anode sodium sulfur