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High-frequency MnZn soft magnetic ferrite by engineering grain boundaries with multiple-ion doping

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Journal of Materials Science & Technology 2021年第20期79卷 165-170页

作者： Mi Yan Shengbo Yi Xiuyuan Fan Zhenghua Zhang jiaying Jin Guohua Bai Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou310018China School of Materials Science and Engineering State Key Laboratory of Silicon MaterialsKey Laboratory of Novel Materials for Information Technology of Zhejiang ProvinceZhejiang UniversityHangzhou310027China

MnZn soft magnetic ferrites have been widely utilized in power electronics,owing to the combined merits of high permeability and low energy ***,their deployment would result in a drastic increase in power dissipation at>3 MHz,thus limiting the scope extent of miniaturization,together with their ***,we report a high-performance MnZn ferrite by doping multiple ions(La,Ti,Si,Ca)at grain boundaries,achieving the most optimized power loss of 267 kW/m^(3) at 5 MHz(10 m T,100℃)and initial permeability of 644,which is much better than the previously reported results and commercial *** an improvement is attributed to weakened magnetic exchange coupling at grain-boundary regions,associated with a significant transition from the multi-to mono-domain structures,originating physically from large crystallographic mis-orientations(>25°).The present study bears important significance in understanding the intrinsic correlation between the crystallographic mis-orientation and magnetic domain structure,and provides an alternative way for optimizing high-frequency soft magnetic ferrites.

关键词： MnZn ferrite Multi-ion doping MHz application Grain size Crystallographic mis-orientations

Poly(carbonate)-based ionic plastic crystal fast ion-conductor for solid-state rechargeable lithium batteries

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Journal of Energy Chemistry 2022年第10期31卷 360-369,I0009页

作者： He Zhou jiaying Xie Lixia Bao Sibo Qiao Jiefei Sui Jiliang Wang School of Chemical Science and Technology National Demonstration Center for Experimental Chemistry and Chemical Engineering EducationYunnan UniversityKunming 650091YunnanChina

Liquid plasticizers with a relatively higher dielectric coefficient like ethylene carbonate(EC),propylene carbonate(PC),and ethyl methyl carbonate(EMC) are the most commonly used electrolyte materials in commercial rechargeable lithium batteries(LIBs) due to their outstanding dissociation ability to lithium ***,volatility and fluidity result in their inevitable demerits like leakage and potential safety problem of the final *** we for the first time device a subtle method to prepare a novel thermal-stable and non-fluid poly(carbonate) solid-state electrolyte to merge EC with lithium *** this aim,a series of carbonate substituted imidazole ionic plastic crystals(G-NTOC) with different polymerization degrees have been *** resulting G-NTOC shows an excellent solid-state temperature window(R.T.-115℃).More importantly,the maximum ionic conductivity and lithium transference number of the prepared G-NTOC reach 0.36 × 10^(-3) S cm^(-1) and 0.523 at 30℃,*** cycling test results reveal that the developed G-NTOC solid-state electrolytes are favorable to restraining the growth of lithium dendrite due to the excellent compatibility between the electrode and the produced plastic crystal *** fabricated LiIG-NTOCILiFeP04 all-solid-state cell initially delivers a maximum discharge capacity of 152.1 mAh g^(-1) at the discharge rate of 0.1 *** chargingdischarging the cell for 60 times,Coulombic efficiency of the solid-state cell still exceeds 97%.Notably,the LiIG-NTOCILiFeP04 cell can stably light a commercial LED with a rated power of 0.06 W for more than1 h at 30℃,and the output power nearly maintains unchanged with the charging-discharging cycling test,implying a sizeable potential application in the next generation of solid-state LIBs.

关键词： Polycarbonate Ionic plastic crystal Solid state electrolyte Fast ion conductor Rechargeable lithium batteries

Study on the chaperone properties of conserved GTPases

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Protein & Cell 2012年第1期3卷 44-50页

作者： Xiang Wang jiaying Xue Zhe Sun Yan Qin Weimin Gong RNA Lab Institute of BiophysicsChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100039China

As a large family of hydrolases,GTPases are widespread in cells and play the very important biological function of hydrolyzing GTP into GDP and inorganic phosphate through binding with *** are involved in cell cycle regulation,protein synthesis,and protein *** can facilitate the folding or refolding of nascent peptides and denatured proteins to their native ***,chaperones do not occur in the native structures in which they can perform their normal biological *** the current study,the chaperone activity of the conserved GTPases of Escherichia coli is tested by the chemical denaturation and chaperone-assisted renaturation of citrate synthase andα-*** effects of ribosomes and nucleotides on the chaperone activity are also *** data indicate that these conserved GTPases have chaperone properties,and may be ancestral protein folding factors that have appeared before dedicated chaperones.

关键词： protein folding chaperone conserved GTPase

Physicochemical factors affecting the wettability of copper mine blasting dust

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International Journal of Coal Science & Technology 2021年第2期8卷 265-273页

作者： Longzhe Jin Jianguo Liu Jingzhong Guo jiaying Wang Tianyang Wang School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of High-Efficient Mining and Safety of Metal Mines of the Ministry of Education University of Science and Technology BeijingBeijing 100083China Mine Emergency Technology Research Center University of Science and Technology BeijingBeijing 100083China College of Safety Engineering North China Institute of Science and TechnologySanhe 101601China

To investigate the factors affecting the wettability of copper mine blasting dust,the primary blasting dust was collected from an open-pit copper mine and separated into hydrophilic blasting dust(HLBD)and hydrophobic blasting dust(HBBD)using water flotation *** physicochemical properties of HLBD and HBBD were measured and compared with each *** properties included particle size distributions(PSDs),micromorphologies,pore structures,mineral components and surface organic carbon functional *** results show that particle size and pore structure of the blasting dust are the main factors affecting its ***,particle size of HBBD is smaller than that of HLBD,and their respiratory dust(less than 10μm)accounts for 61.74 vol%and 53.00 vol%,*** pore structure of HBBD is more developed,and the total pore volume of HBBD is 1.66 times larger than that of *** identical mineral compositions were detected in HLBD and HBBD by X-rays diffraction(XRD);however,the surface organic hydrophobic component of HBBD is slightly larger than that of HLBD,this may be the reason for the poor wettability of *** study is significant to understand the effects of physicochemical properties of copper mine blasting dust on its wettability.

关键词： Blasting dust Copper mine Wettability Physicochemical properties

An Optimization Method for a Single Machine Multi-family Scheduling Problem with Qualification Run Constraints

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Journal of Harbin Institute of Technology(New Series) 2018年第2期25卷 24-32页

作者： Binghai Zhou jiaying Gu School of Mechanical Engineering Tongji University

The qualification run(qual-run) as a technique to avoid possible quality problems of products inevitably leads to much longer cycle time. To effectively balance the trade-off between the qual-run and setup times,a scheduling model of a single machine with multiple families was developed and an adaptive differential evolution algorithm based on catastrophe with depth neighborhood search was applied to resolve the problem. First,a scheduling problem domain was described,and a mathematical programming model was set up with an objective of minimizing makespan. Further,several theorems were developed to construct feasible solutions. On the basis of differential evolution,the depth neighborhood search operator was adopted to search a wide range of solutions. In addition,the adaptive process and catastrophe theory were combined to improve the performance of the algorithm. Finally,simulation experiments were carried out and the results indicated that the proposed algorithm was effective and efficient.

关键词： setup qual-run multi-family scheduling hybrid differential evolution algorithm

KVPO_(4)F/carbon nanocomposite with highly accessible active sites and robust chemical bonds for advanced potassium-ion batteries

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Green Energy & Environment 2023年第5期8卷 1469-1478页

作者： Jianzhi Xu Liping Duan jiaying Liao Haowei Tang Jun Lin Xiaosi Zhou School of Chemistry and Materials Science Nanjing Normal UniversityNanjing210023China

KVPO_(4)F(KVPF)has been extensively investigated as the potential cathode material for potassium-ion batteries(PIBs)owing to its high theoretical capacity,superior operating voltage,and three-dimensional Kt conduction ***,the electrochemical behavior of KVPF is limited by the inherent poor electronic conductivity of the phosphate framework and unstable electrode/electrolyte *** address the above issues,this work proposes an infiltration-calcination method to confine the in-situ grown KVPF into the mesoporous carbon CMK-3(denoted KVPF@CMK-3).The assembled KVPF@CMK-3 nanocomposite features three-dimensional interconnected carbon channels,which not only offer abundant active sites and significantly accelerate K t/electron transport,but also prevent the growth of KVPF nanoparticle agglomerates,hence stabilizing the structure of the ***,V–F–C bonds are created at the interface of KVPF and CMK-3,which reduce the loss of F and stabilize the electrode ***,when tested as a cathode material for PIBs,the KVPF@CMK-3 nanocomposite delivers superior reversible capacitiy(103.2 mAh g^(-1) at 0.2 C),outstanding rate performance(90.1 mAh g^(-1) at 20 C),and steady cycling performance(92.2 mAh g^(-1) at 10 C and with the retention of 88.2%after 500 cycles).Moreover,its potassium storage mechanism is further examined by ex-situ XRD and ex-situ XPS *** above synthetic strategy demonstrates the potential of KVPF@CMK-3 to be applied as the cathode for PIBs.

关键词： Potassium-ion batteries Cathode KVPO_(4)F CMK-3 V–F–C bond

Tunable Co/ZnO/C@MWCNTs based on carbon nanotube-coated MOF with excellent microwave absorption properties

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Journal of Materials Science & Technology 2022年第32期127卷 153-163页

作者： Zirui Jia Mingyue Kong Bowen Yu Yingzhuo Ma jiaying Pan Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-Fibers and Eco-TextilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China Weihai Innovation Institute Qingdao UniversityWeihai 264200China

The development of global information technology makes human life intelligent,and the large-scale use of various electronic devices increases the electromagnetic radiation in the surrounding *** has created a requirement for the development of high-performance electromagnetic wave absorbers to eliminate electromagnetic ***,the preparation of electromagnetic wave absorbers with excellent electromagnetic loss capability remains a great ***,we present a method to prepare Co/ZnO/C@MWCNTs(CZC@M)composites by pyrolysis of ZnCo-MOF@MWCNTs(MOF@M).Specifically,MWCNTs are uniformly distributed on the CZC surface to form multiple heterogeneous interfaces,which will lead to an increase in *** addition,changing the amounts of MWCNTs in the composite can modulate its dielectric constant and impedance matching ***,at only 10%sample content,the minimum reflection loss of-41.75 d B and the maximum effective absorption bandwidth of 4.72 GHz are obtained at thicknesses of 2.4 mm and 2.2 mm,***,the results reported in this work provide a new design strategy for the synthesis of high-performance electromagnetic wave absorbers with potential applications in the elimination of electromagnetic pollution.

关键词： MWCNTs Metal organic frameworks CZC@M Microwave absorption

Recent Progress and Prospects of Layered Cathode Materials for Potassium-ion Batteries

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Energy & Environmental Materials 2021年第2期4卷 178-200页

作者： jiaying Liao Yu Han Zhuangzhuang Zhang Jingyi Xu Jianbo Li Xiaosi Zhou Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China

Layered materials with two-dimensional ion diffusion channels and fast kinetics are attractive as cathode materials for secondary ***,one main challenge in potassium-ion batteries is the large ion size of K^(+),along with the strong K^(+)-K^(+)electrostatic *** strong interaction results in initial K deficiency,greater voltage slope,and lower specific capacity between set voltage ranges for layered transition metal *** this review,a comprehensive review of the latest advancements in layered cathode materials for potassium-ion batteries is *** for layered transition metal oxides,some polyanionic compounds,chalcogenides,and organic materials with the layered structure are introduced ***,summary and personal perspectives on future optimization and structural design of layered cathode materials are constructively *** strongly appeal to the further exploration of layered polyanionic compounds and have demonstrated a series of novel layered structures including layered K_(3)V_(2)(PO_(4))_(3).

关键词： cathode layered material potassium-ion battery structural regulation

Mechanisms for different cyclabilities of commercial LiCoO2/artificial graphite pouch cells at−10,0,and 25℃

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Particuology 2024年第12期95卷 145-153页

作者： Renbo Deng Shiran Li Qianqian Wang jiaying Liang Xufeng Zang Huiling Xia Huzhou Key Laboratory of Materials for Energy Conversion and Storage School of ScienceHuzhou UniversityZhejiangHuzhou313000China Laboratory Management Department Huzhou UniversityZhejiangHuzhou313000China

Although a few studies reveal the reasons of poor charge-discharge abilities for lithium-ion batteries based on LiNi_(x)Mn_(y)Co_(1-x-y)O_(2) at low temperature,there are still some practical issues worthy of further *** instance,how the side reactions affect the cyclabilities of commercial LiCoO_(2)/artificial graphite(LCO/AG)cells at different low temperatures,and are the synergistic effects between the side reactions similar to that at room temperature?To answer the issues,the performances of a-3 Ah LCO/AG pouch cell at different temperatures and C-rates are *** illustrate that the obvious increase in charge transferring impedance especially in AG anode at low temperature causes large polarization,then reducing charge-discharge ability and even yielding lithium deposition at−10℃ and 0.5C under 3−4.45 *** from at room temperature,the side reactions such as electrolyte decomposition and electrode structural evolution reduce significantly at low temperature,which contribute to an excellent cyclability after 500 cycles at 0℃.Instead,a series of chain reactions cause a relative lower cyclability at 25℃.Lithium deposition is slight after 5 cycles at−10℃,but become considerably severe after 20 cycles and cause rollover failure of *** these results deepen the understanding on mechanisms for different behaviors of LCO/AG cells at low temperature and provide optimization direction.

关键词： Lithium-ion batteries LiCoO_(2) Low temperature Cycle stability Failure mechanism