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Nano Research 2024年第7期17卷 6203-6211页

作者： Yan Zhang Huandi Zhang xiaoxiao Wang Cheng Tang xiaowei Shi Zehua zhao Jiamei Liu Guolong Wang Jianfeng Shen Lei Li state key laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong University28 Xianning West RoadXi’an 710049China Center for Materials Chemistry Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Instrument Analysis Center of xi'an jiaotong university Xi’an Jiaotong University28 Xianning West RoadXi’an 710049China Institute of special materials and technology Fudan UniversityShanghai 200433China

The graphene-based microsupercapacitors(MSCs)suffer from graphene aggregation issue in *** reduces the electrolyte ions transportation in the electrodes to degrade the charge storage ability of MSCs,hampering their practical *** the electrolyte ions transportation in the electrodes can boost the charge storage ability of ***,we design and experimentally realize pillar array structure of graphene electrodes for MSCs by direct ink writing *** graphene electrodes with pillar array structure increase the contact area with electrolyte and short the electrolyte ions transport path,facilitating electrolyte ions transport in *** MSCs exhibit high areal capacitance of 25.67 mF·cm^(−2),high areal energy density of 20.54μWh·cm^(−2),and high power density of 1.45 mW·cm^(−2).One single MSCs can power timer for 10 min and pressure sensor more than 160 min,showing high practical application *** work provides a new avenue for developing high performance MSCs.

关键词： microsupercapacitors pillar array structure direct ink writing areal energy density ion transport

Effect of electron beam irradiation on surface molecule and flashover voltage of epoxy composites

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High Voltage 2024年第3期9卷 528-536页

作者： Mingru Li Huan Niu Kai Shang Jianyu Lang Yafang Gao Bingnan Li Jiuhui zhao Zhen Li Yang Feng Shengtao Li state key laboratory of Electrical Insulation and power Equipment Xi'an Jiaotong UniversityXi'anShaanxiChina key laboratory of engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbinHeilongjiangChina

The unsatisfactory insulating properties of solid–gas interfaces seriously restrict the development of high-voltage electrical equipment and threaten their power supply ***-beam irradiation(EBI)can effectively improve the surface flashover voltage of ***,the underlying mechanism of EBI in tailoring the surface trap and improving the flashover voltage remains *** this study,the surface morphologies and chemical compositions of epoxy composites treated with EBI were *** addition,the surface wetting properties,surface charge migration pa-rameters,and surface flashover voltages were experimentally *** was found that EBI aggravated the surface morphology,changed the surface chemical components,and repressed surface charge *** a result,the contact angle was reduced from 103.7°to 78.43°,and the flashover voltage in SF6 was increased from 35.26 to 38.90 *** calculations showed that the newly generated C–O–H and C=O bonds on the surface molecules after EBI formed charge centres at the molecular electrostatic potential,which enhanced the trapping effect of the surface deep *** a result,surface charge migration was repressed,and the surface flashover voltage was *** study could promote the further development of EBI on materials modification.

关键词： composites surface beam

减缓自由阴离子迁移以缓解浓差极化用于高性能的聚合物锂金属电池

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Science Bulletin 2024年第11期69卷 1706-1715页

作者：崔满营秦棪阳李智超赵洪洋刘理民江智元曹振江赵坚蕴毛博阳于伟苏亚琼 RVasant Kumar 丁书江屈治国郗凯 School of Chemistry Engineering Research Center of Energy Storage Materials and DevicesMinistry of EducationNational Innovation Platform(Center)for Industry-Education Integration of Energy Storage TechnologyState Key Laboratory for Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China MOE key laboratory of Thermo-Fluid Science and engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Chemical engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China Department of engineering University of CambridgeCambridge CB30FAUK Department of Materials Science and Metallurgy University of CambridgeCambridge CB30FSUK

Traditional dual-ion lithium salts have been widely used in solid polymer lithium-metal batteries(LMBs).Nevertheless, concentration polarization caused by uncontrolled migration of free anions has severely caused the growth of lithium dendrites. Although single-ion conductor polymers(SICP) have been developed to reduce concentration polarization, the poor ionic conductivity caused by low carrier concentration limits their application. Herein, a dual-salt quasi-solid polymer electrolyte(QSPE), containing the SICP network as a salt and traditional dual-ion lithium salt, is designed for retarding the movement of free anions and simultaneously providing sufficient effective carriers to alleviate concentration polarization. The dual salt network of this designed QSPE is prepared through in-situ crosslinking copolymerization of SICP monomer, regular ionic conductor, crosslinker with the presence of the dual-ion lithium salt,delivering a high lithium-ion transference number(0.75) and satisfactory ionic conductivity(1.16 × 10^(-3) S cm^(-1) at 30 ℃). Comprehensive characterizations combined with theoretical calculation demonstrate that polyanions from SICP exerts a potential repulsive effect on the transport of free anions to reduce concentration polarization inhibiting lithium dendrites. As a consequence, the Li||LiFePO_4 cell achieves a long-cycle stability for 2000 cycles and a 90% capacity retention at 30 ℃. This work provides a new perspective for reducing concentration polarization and simultaneously enabling enough lithiumions migration for high-performance polymer LMBs.

关键词： Polymer electrolyte Concentration polarization Energy storage materials Ion transport regulation Lithium-metal battery

Experimental investigation of inflow-outflow asymmetry in induced-charge electro-osmosis

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Energy Storage and Saving 2024年第1期3卷 16-22页

作者： Lingqi zhao Tianwei Lai Yingke Gao Shaohang Yan Mingzhe Liu Yu Hou state key laboratory of multiphase flow in power engineering Xi’an Jiaotong UniversityXi’an710049China MOE key laboratory of Cryogenic Technology and Equipment Xi’an Jiaotong UniversityXi’an710049China

Induced-charge electro-osmosis(ICEO)is a research hotspot in bioengineering and analytical ***-outflow asymmetry of ICEO was reported in the existing literatures,but systematic study on this phenomenon is *** this experimental study,we found that in strong electric fields,not only the velocity magnitude but also the vortex positions of ICEO are asymmetrical along the inflow and outflow directions because of the pronounced non-uniform surface electrokinetic *** the inflow and outflow directions,the amplitudes of velocities are unequal,ICEO maximum velocity positions change depending on the electric field intensity and sodium chloride(NaCl)***,the distances between vortex centers are *** NaCl solution concentration of 0.001 mol⋅L^(-1),the outflow velocity almost *** asymmetry rises with the increasing electric field *** new discoveries can direct the application of microscale devices.

关键词： Induced-charge electro-osmosis Micro-particle image velocimetry Inflow-outflow asymmetry

Biphase-to-monophase structure evolution of Na_(0.766+x)Li_(x)Ni_(0.33-x)Mn_(0.5)Fe_(0.1)Ti_(0.07)O_(2) toward ultradurable Na-ion batteries

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Carbon Energy 2024年第9期6卷 66-79页

作者： Mengting Liu Zhiwei Cheng Xu Zhu Haojie Dong Tianran Yan liang Zhang Lu Zheng Hu-Rong Yao xian-Zuo Wang Lianzheng Yu Bing xiao Yao xiao Peng-Fei Wang state key laboratory of Electrical Insulation and power Equipment School of Electrical EngineeringCenter of Nanomaterials for Renewable EnergyXi'an Jiaotong UniversityXi'anShaanxiChina Jiangsu key laboratory of Advanced Negative Carbon Technologies Institute of Functional Nano&Soft Materials(FUNSOM)Soochow UniversitySuzhouJiangsuChina Fujian Provincial key laboratory of Quantum Manipulation and New Energy Materials College of Physics and EnergyFujian Normal UniversityFuzhouFujianChina Wenzhou key laboratory of Sodium-Ion Batteries Institute for Carbon NeutralizationWenzhou University Technology InnovationWenzhouZhejiangChina

Layered composite oxide materials with O3/P2 biphasic crystallographic structure typically demonstrate a combination of high capacities of the O3 phase and high operation voltages of the P2 ***,their practical applications are seriously obstructed by difficulties in thermodynamic phase regulation,complicated electrochemical phase transition,and unsatisfactory cycling ***,we propose an efficient structural evolution strategy from biphase to monophase of Na_(0.766+x)Li_(x)Ni_(0.33-x)Mn_(0.5)Fe_(0.1)Ti_(0.07)O_(2) through Li+*** role of Li+substitution not only simplifies the unfavorable phase transition by altering the local coordination of transition metal(TM)cations but also stabilizes the cathode–electrolyte interphase to prevent the degradation of TM cations during battery *** a result,the thermodynamically robust O_(3)-Na_(0.826)Li_(0.06)Ni_(0.27)Mn_(0.5)Fe_(0.1)Ti_(0.07)O_(2) cathode delivers a high capacity of 139.4 mAh g^(-1) at 0.1 C and shows prolonged cycling life at high rates,with capacity retention of 81.6%at 5 C over 500 *** work establishes a solid relationship between the thermodynamic structure evolution and electrochemistry of layered cathode materials,contributing to the development of long-life sodium-ion batteries.

关键词： electrochemistry Li+substitution Na-ion batteries O_(3)phase phase transition

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基于新型夹具的输电塔塔脚受压性能研究

电网与清洁能源 2024年第7期40卷 62-70页

作者：张小民谭蓉赵文硕梁刚国网陕西省电力有限公司经济技术研究院陕西西安710065 中国能源建设集团陕西省电力设计院有限公司陕西西安710054 西华大学电气与电子信息学院四川成都610000 西北旱区生态水利国家重点实验室陕西西安710048 西安理工大学土木建筑工程学院陕西西安710048

基于新型夹具式输电塔主材加固技术,提出了一种塔脚处加固材连接新方法,可有效避免对原塔脚连接板的二次损伤,简化了施工过程。通过对2组共6个足尺试件进行偏心受压试验,研究了加固后塔脚十字型组合构件的破坏模式、极限承载力以及应力... 详细信息

基于新型夹具式输电塔主材加固技术,提出了一种塔脚处加固材连接新方法,可有效避免对原塔脚连接板的二次损伤,简化了施工过程。通过对2组共6个足尺试件进行偏心受压试验,研究了加固后塔脚十字型组合构件的破坏模式、极限承载力以及应力分布规律等受力行为。研究结果表明:加固后塔脚的破坏模式为局部屈曲,其位于组合构件塔脚以外的原材上;与单角钢构件相比,组合构件的极限承载力提高幅度约46%;试验过程中,主材截面应变发展迅速,加固材截面应变发展较缓慢且应变较小,基本处于弹性阶段。

关键词：输电塔新型夹具抗风加固塔脚连接受压性能

Development of an Integrated CMUTs-Based Resonant Biosensor for Label-Free Detection of DNA with Improved Selectivity by Ethylene-Glycol Alkanethiols

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engineering 2024年第10期41卷 231-241页

作者： Zhikang Li Yihe zhao Gian Luca Barbruni Jie Li Zixuan Li Jiawei Yuan Ping Yang Libo zhao Zhuangde Jiang Sandro Carrara state key laboratory for Manufacturing Systems engineering the International Joint Laboratory for Micro/Nano Manufacturing and Measurement TechnologiesXi’an Jiaotong UniversityXi’an 710049China xi’an jiaotong university(Yantai)Research Institute for Intelligent Sensing Technology and System Yantai 264003China School of Instrument Science and Technology Xi’an Jiaotong UniversityXi’an 710049China School of Mechanical engineering Xi’an Jiaotong UniversityXi’an 710049China Shandong laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China Bio/CMOS Interfaces laboratory Institute of Electrical and MicroengineeringSchool of EngineeringÉcole Polytechnique Fédérale de LausanneNeuchâtel 2000Switzerland College of Mechanical and Electrical engineering Shaanxi University of Science and TechnologyXi’an 710021China

Gravimetric resonant-inspired biosensors have attracted increasing attention in industrial and point-ofcare applications,enabling label-free detection of biomarkers such as DNA and *** micromachined ultrasonic transducers(CMUTs)are promising tools for developing miniaturized highperformance biosensing complementary metal–oxide–silicon(CMOS)***,their operability is limited by inefficient functionalization,aggregation,crosstalk in the buffer,and the requirement for an external high-voltage(HV)power *** this study,we aimed to propose a CMUTs-based resonant biosensor integrated with a CMOS front–end interface coupled with ethylene–glycol alkanethiols to detect single-stranded DNA oligonucleotides with large *** topography of the functionalized surface was characterized by energy-dispersive X-ray *** selectivity for onchip hybridization was demonstrated by comparing complementary and non-complementary singlestranded DNA oligonucleotides using fluorescence imaging *** sensor array was further characterized using a five-element lumped equivalent *** 4 mm^(2) application-specific integrated circuit chip was designed and developed through 0.18 lm HV bipolar-CMOS-double diffused metal–oxide–silicon(DMOS)technology(BCD)to generate on-chip 20 V HV boosting and to track feedback frequency under a standard 1.8 V supply,with a total power consumption of 3.8 mW in a continuous *** measured results indicated a detection sensitivity of 7.943×10^(-3) lmol·L^(-1)·Hz^(-1) over a concentration range of 1 to 100 lmol·L^(-1).In conclusion,the label-free biosensing of DNA under dry conditions was successfully demonstrated using a microfabricated CMUT array with a 2 MHz frequency on CMOS electronics with an internal HV ***,ethylene–glycol alkanethiols successfully deposited self-assembled monolayers on aluminum electrodes,which has never been attempted thus far on CMUTs,to enhance the sel

关键词： Capacitive micromachined ultrasonic transducers(CMUTs) DNA detection Self-assembled monolayer(SAM) Ethylene-glycol alkanethiols Application-specific integrated circuit(ASIC)

基于多物理场仿真的低频变压器温度特性分析及导向结构优化

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高电压技术 2024年第5期50卷 2009-2019,I0014,I0015页

作者：王巧媛贾少锋梁得亮赵义焜毕建刚杨智西安交通大学电工材料电气绝缘全国重点实验室西安710049 中国电力科学研究院有限公司北京100192 国网浙江省电力有限公司电力科学研究院杭州310000

为了降低低频工况下油浸式电力变压器的热点温度与内部温升,基于电磁-热-流体场多物理场耦合对低频变压器绕组区域导向结构开展优化分析。通过对变压器电磁部分的有限元数值计算,确定低频变压器与同工况下的工频变压器在铁芯和绕组区域... 详细信息

为了降低低频工况下油浸式电力变压器的热点温度与内部温升,基于电磁-热-流体场多物理场耦合对低频变压器绕组区域导向结构开展优化分析。通过对变压器电磁部分的有限元数值计算,确定低频变压器与同工况下的工频变压器在铁芯和绕组区域的磁密分布与损耗特性区别。然后在此基础上将铁芯和绕组的损耗作为热源代入流体场和温度场进行仿真分析,得到变压器整体和绕组区域局部的温度及油流分布。最后通过构建20 Hz低频变压器绕组区域的油流传热模型,结合有限元仿真研究导油挡板数量与分布对绕组区域油流量、平均温度和热点温度的影响,并获得导向结构的最佳分配方案。研究结果表明,20 Hz低频变压器绕组区域的热点温度较无挡油板的模型下降了14.44%,该结果可为低频变压器紧凑化设计提供优化方案。

关键词：低频油浸式变压器多物理场仿真损耗密度温升分布导向结构热点温度

Bacterial nanocellulose assembly into super-strong and humidity-responsive macrofibers

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Journal of Bioresources and Bioproducts 2024年第3期9卷 369-378页

作者： Yadong zhao Zheng Yang Rusen Zhou Bin Zheng Meiling Chen Fei Liu Wenhua Miao Renwu Zhou Patrick Cullen Zhenhai xia Liming Dai Kostya(Ken)Ostrikov School of Food and Pharmacy Zhejiang Ocean UniversityZhoushan 316022China state key laboratory of Electrical Insulation and power Equipment Center for Plasma BiomedicineXi'an Jiaotong UniversityXi'an 710049China School of Chemical and Biomolecular engineering University of SydneySydney 2006Australia School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbane 4000Australia key laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Australian Carbon Materials Centre(A-CMC) School of Chemical EngineeringUniversity of New South WalesSydneyNew South Wales 2052Australia

Cellulose macrofibers (MFs) are gaining increasing interest as natural and biodegradable alternatives to fossil-derived polymers for both structural and functional applications. However, simultaneously achieving their exceptional mechanical performance and desired functionality is challenging and requires complex processing. Here, we reported a one-step approach using a tension-assisted twisting (TAT) technique for MF fabrication from bacterial cellulose (BC). The TAT stretches and aligns BC nanofibers pre-arranged in hydrogel tubes to form MFs with compactly assembled structures and enhanced hydrogen bonding among neighboring nanofibers. The as-prepared BC MFs exhibited a very high tensile strength of 1 057 MPa and exceptional lifting capacity (over 340 000 when normalized by their own weight). Moreover, due to the volume expansion of BC nanofibers upon water exposure, BC MFs quickly harvested energy from environmental moisture to untwist the bundled networks, thus generating a torsional spinning with a peak rotation speed of 884 r/(min·m). The demonstrated rapid and intense actuation response makes the MFs ideal candidates for diverse humidity-response-based applications beyond advanced actuators, remote rain indicators, intelligent switches, and smart curtains.

关键词： Nanocellulose assembly Cellulose macrofibers Super-strong Humidity-responsive actuation Moisture Fast actuation

750℃高温CO_(2)掺杂SO_(2)环境中Super304H及Inconel625的腐蚀行为

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中国电机工程学报 2024年第11期44卷 4387-4394,I0017页

作者：周永莉赵钦新鲁金涛袁勇梁志远杨珍黄锦阳热流科学与工程教育部重点实验室(西安交通大学能源与动力工程学院) 陕西省西安市710049 电站锅炉煤清洁燃烧国家工程中心(西安热工研究院有限公司) 陕西省西安市710032

研究掺杂气体对合金的腐蚀行为及作用机理对超临界二氧化碳(supercritical carbon dioxide,S-CO_(2))发电技术具有重要意义。该文开展Super304H及Inconel625合金的高温CO_(2)腐蚀试验,并结合腐蚀增重法、扫描电镜观察及XRD分析,研究两... 详细信息

研究掺杂气体对合金的腐蚀行为及作用机理对超临界二氧化碳(supercritical carbon dioxide,S-CO_(2))发电技术具有重要意义。该文开展Super304H及Inconel625合金的高温CO_(2)腐蚀试验,并结合腐蚀增重法、扫描电镜观察及XRD分析,研究两种耐热合金在750℃CO_(2)及掺杂SO_(2)环境中的腐蚀行为。结果表明,两种合金在750℃CO_(2)、750℃CO_(2)+SO_(2)环境中的腐蚀动力学均遵循抛物线规律,Inconel625抗腐蚀能力优于Super304H,具有较少的腐蚀增重;Super304H在750℃CO_(2)腐蚀初期增重高于CO_(2)+SO_(2)环境,而120 h后在CO_(2)+SO_(2)环境中腐蚀增重较高。两种环境中腐蚀500 h后,Super304H表面氧化膜为单层Cr_(2)O_(3)及外层疏松瘤状富铁氧化物与内氧化物FeCr_(2)O_(4)组成的局部双层氧化膜;Inconel625为单层均匀致密Cr_(2)O_(3)氧化膜,平均厚度不到1μm。高温CO_(2)腐蚀环境中,Cr含量对提高合金抗腐蚀性能具有至关重要的作用。高温CO_(2)掺杂SO_(2)对于Cr_(2)O_(3)形成合金具有抑制渗碳的作用,对于氧化铁形成合金具有加速腐蚀及渗碳作用。

关键词：耐热合金高温CO_(2) 掺杂气体 SO_(2) 腐蚀渗碳