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Meltblown fabric vs nanofiber membrane, which is better for fabricating personal protective equipments

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Chinese Journal of Chemical Engineering 2021年第8期34卷 1-9页

作者： junwei wu Hongjia Zhou Jingyi Zhou Xiao Zhu Bowen Zhang Shasha Feng Zhaoxiang Zhong Lingxue Kong Weihong Xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 210009China Jiangsu Jiulang High-Tech Co. LtdNanjing 210009China Department of Material and Chemical Engineering Soochow UniversitySuzhou 215006China Institute for Frontier Materials Deakin UniversityGeelongVictoria 3216Australia

The coronavirus disease 2019(COVID-19)pandemic has led to a great demand on the personal protection products such as reusable *** a key raw material for masks,meltblown fabrics play an important role in rejection of ***,the electrostatic dominated aerosol rejection mechanism of meltblown fabrics prevents the mask from maintaining the desired protective effect after the static charge ***,novel reusable masks with high aerosols rejection efficiency were fabricated by the introduction of spider-web bionic nanofiber membrane(nano cobweb-biomimetic membrane).The reuse stability of meltblown and nanofiber membrane mask was separately evaluated by infiltrating water,75%alcohol solution,and exposing under ultraviolet(UV)*** the water immersion test,the filtration efficiency of meltblown mask was decreased to about 79%,while the nanofiber membrane was maintained at 99%.The same phenomenon could be observed after the 75%alcohol treatment,a high filtration efficiency of 99%was maintained in nanofiber membrane,but obvious negative effect was observed in meltblown mask,which decreased to about 50%.In addition,after long-term expose under UV light,no filtration efficiency decrease was observed in nanofiber membrane,which provide a suitable way to disinfect the potential carried *** work successfully achieved the daily disinfection and reuse of masks,which effectively alleviate the shortage of masks during this special period.

关键词： Filtration efficiency Meltblown fabrics Nano cobweb-biomimetic membrane Reusable mask

One-step synthesis of novel core-shell bimetallic hexacyanoferrate for high performance sodium-storage cathode

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Journal of Materials Science & Technology 2022年第19期114卷 180-190页

作者： Daxian Zuo Cuiping Wang Jiajia Han Qinghao Han Yanan Hu junwei wu Huajun Qiu Qian Zhang Xingjun Liu College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials Xiamen UniversityXiamen 361005China Institute of Materials Genome and Big Data Harbin Institute of TechnologyShenzhen 518055China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055China

Recently, the design of core-shell hierarchical architecture plays an important role in improving the electrochemical performance of Prussian blue analogue cathodes(PBAs). Unfortunately, the inconvenient stepwise preparation and the strict lattice-matching requirement have restricted the development of coreshell PBAs. Herein, we demonstrate a one-step synthesis strategy to synthesize core-shell manganese hexacyanoferrate(MnFeHCF@MnFeHCF) for the first time. And the formation mechanism of the core-shell hierarchical architecture is investigated by first-principles calculations. It is found that the as-obtained Mn FeHCF@MnFeHCF act out the superior intrinsic natures, which not only can obtain a larger specific surface area and lower Fe(CN)_(6) vacancies but also can activate more Na-storage sites. Compared with the manganese hexacyanoferrate(MnHCF), the iron hexacyanoferrate(FeHCF), and even the traditional coreshell nickel hexacyanoferrate(FeHCF@NiHCF) prepared by a stepwise method, the Mn Fe HCF@MnFeHCF demonstrates a superior rate performance, which achieves a high capacity of 131 mAh g^(−1) at 50 mA g^(−1) and delivers a considerable discharge capacity of about 100 mAh g^(−1) even at 1600 mA g^(−1). Meantime, the capacity retention can reach up to nearly 80% after 500 cycles. The improved performances could be mainly originated from two aspects: on the one hand, Mn substitution is helpful to enhance the material conductivity;on the other hand, the core-shell structure with matched lattice parameters is more favorable to enhance the diffusion coefficient of sodium ions. Beside, the structural transformation of MnFeHCF@MnFeHCF upon the extraction/insertion of sodium ions is instrumental in releasing the interior stress and effectively maintaining the integrity of the crystal structure.

关键词： Cathode Prussian blue analogue Core-shell structure First-principles calculations Electrochemical performance

Prediction of impedance responses of protonic ceramic cells using artificial neural network tuned with the distribution of relaxation times

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Journal of Energy Chemistry 2023年第3期78卷 582-588,I0016页

作者： Xuhao Liu Zilin Yan junwei wu Jake Huang Yifeng Zheng Neal PSullivan Ryan O'Hayre Zheng Zhong Zehua Pan School of Science Harbin Institute of TechnologyShenzhen 518055GuangdongChina School of Materials Engineering Harbin Institute of TechnologyShenzhen 518055GuangdongChina Department of Metallurgical and Materials Engineering Colorado School of Mines1500 Illinois St.Golden 80401ColoradoUSA College of Materials Science and Engineering Nanjing Tech UniversityNo.30 Puzhu Road(S)Nanjing 211816JiangsuChina Department of Mechanical Engineering Colorado School of Mines1500 Illinois St.Golden 80401ColoradoUSA

A deep-learning-based framework is proposed to predict the impedance response and underlying electrochemical behavior of the reversible protonic ceramic cell(PCC) across a wide variety of different operating *** impedance spectra(EIS) of PCCs were first acquired under a variety of opera ting conditions to provide a dataset containing 36 sets of EIS spectra for the *** artificial neural network(ANN) was then trained to model the relationship between the cell operating condition and EIS ***,ANN model-predicted EIS spectra were analyzed by the distribution of relaxation times(DRT) and compared to DRT spectra obtained from the experimental EIS data,enabling an assessment of the accumulative errors from the predicted EIS data vs the predicted *** show that in certain cases,although the R^(2)of the predicted EIS curve may be> 0.98,the R^(2)of the predicted DRT may be as low as~*** can lead to an inaccurate ANN prediction of the underlying time-resolved electrochemical response,although the apparent accuracy as evaluated from the EIS prediction may seem *** adjustment of the parameters of the ANN framework,the average R^(2)of the DRTs derived from the predicted EIS can be improved to ***,we demonstrate that a properly tuned ANN model can be used as an effective tool to predict not only the EIS,but also the DRT of complex electrochemical systems.

关键词： Protonic ceramic fuel cell/electrolysis cell Electrochemical impedance spectroscopy Distribution of relaxation times Artiﬁcial neural network

Performance and stability analysis of SOFC containing thin and dense gadolinium-doped ceria interlayer sintered at low temperature

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Journal of Materiomics 2022年第2期8卷 347-357页

作者： Yige Wang Chuan Jia Zewei Lyu Minfang Han junwei wu Zaihong Sun Fumitada Iguchi Keiji Yashiro Tatsuya Kawada Department of Energy and Power Engineering Tsinghua UniversityBeijing100084China Department of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen518055China Suzhou Huatsing Jingkun New Energy Technology Co.Ltd Jiangsu215314China Tohoku University Sendai 980-8579Japan

Gadolinium-doped ceria(GDC)interlayers are required to prevent the interfacial reaction between La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3)(LSCF)cathode and Y_(2)O_(3)-stabilized ZrO 2(YSZ)electrolyte in solid oxide fuel cells(SOFCs).However,it's difficult to prepare a thin and dense GDC interlayer on the sintered half-cell at a low *** this study,the physical vapor deposition(PVD)method was employed to success-fully manufacture dense GDC interlayers with the thickness of 1 m *** influences of GDC sintering temperature(900℃,1000℃ and 1100℃)on cell performance characteristics and degradation behavior were *** cell with GDC interlayer sintered at 1100?C showed the lowest degradation rate during the 216-h *** best stability was attributed to the most effective inhibition of Sr diffusion by the GDC interlayer,which was demonstrated by the almost unchanged Ohmic and polari-zation resistances during the aging stage and the negligible Sr enrichment at YSZ/GDC *** to the conventional screen-printed GDC interlayers(sintered above 1250℃),the GDC inter-layer prepared by the PVD method and sintered at 1100℃ was significantly denser and thinner,showing a promising application prospect due to its benefits for cell stability.

关键词： Solid oxide fuel cell Gadolinium-doped ceria Interlayer Sr diffusion Stability analysis

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新型超声换能器在生物医学领域的研究进展

广东工业大学学报 2025年第1期42卷 1-14页

作者：王超程中文吴俊伟文学陈燕曾吕明纪轩荣广东工业大学精密电子制造技术与装备国家重点实验室广东广州510006 荆楚理工学院智能制造学院湖北荆门448000

超声换能器作为生物医学超声系统的核心部件,其性能直接决定诊断和治疗效果。近年来,随着生物医学技术的发展,对高性能超声换能器的需求日益增长。本文综述了新型超声换能器在生物医学领域的最新研究进展,分析了小型、非接触空气耦合、... 详细信息

超声换能器作为生物医学超声系统的核心部件,其性能直接决定诊断和治疗效果。近年来,随着生物医学技术的发展,对高性能超声换能器的需求日益增长。本文综述了新型超声换能器在生物医学领域的最新研究进展,分析了小型、非接触空气耦合、透明、柔性、高频阵列以及低功率等不同类型超声换能器的性能特点,探讨了其在生物医学成像、治疗和神经调控等方面的应用前景,并总结了当前面临的挑战,包括换能器声功能材料选择、结构优化以及应用场景多元化等。未来研究应聚焦于新型声功能材料的开发、高性能换能器设计以及跨学科合作,以推动超声换能器技术更好地服务于生物医学应用。

关键词：超声换能器超声成像超声调控生物医学

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Pseudocapacitive Heteroatom-Doped Carbon Cathode for Aluminum-Ion Batteries with Ultrahigh Reversible Stability

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Energy & Environmental Materials 2024年第5期7卷 150-159页

作者： Jiahui Li Jehad KEl-Demellawi Guan Sheng Jonas Björk Fanshuai Zeng Jie Zhou Xiaxia Liao junwei wu Johanna Rosen Xingjun Liu Husam N.Alshareef Shaobo Tu School of Physics and Materials Science Nanchang University999 Xuefu RoadHonggutan DistrictNanchang 330031China School of Materials Science and Engineering and Institute of Materials Genome and Big DataHarbin Institute of TechnologyShenzhen 518055China KAUST Upstream Research Center(KURC) EXPEC-ARCSaudi AramcoThuwal 23955Saudi Arabia Materials Design Division Department of PhysicsChemistry and Biology(IFM)Linköping UniversitySE-58183LinköpingSweden Physical Science and Engineering(PSE)Division King Abdullah University of Science and TechnologyThuwal 23955Saudi Arabia

Aluminum(Al)-ion batteries have emerged as a potential alternative to conventional ion batteries that rely on less abundant and costly materials like ***,given the nascent stage of advancement in Al-ion batteries(AIBs),attaining electrode materials that can leverage both intercalation capacity and structural stability remains ***,we demonstrate a C3N4-derived layered N,S heteroatom-doped carbon,obtained at different pyrolysis temperatures,as a cathode material for AIBs,encompassing the diffusion-controlled intercalation and surface-induced capacity with ultrahigh *** developed layered N,S-doped corbon(N,S-C)cathode,synthesized at 900℃,delivers a specific capacity of 330 mAhg^(-1)with a relatively high coulombic efficiency of~85%after 500 cycles under a current density of 0.5 A g^(-1).Owing to its reinforced adsorption capability and enlarged interlayer spacing by doping N and S heteroatoms,the N,S-C900 cathode demonstrates outstanding energy storage capacity with excellent rate performance(61 mAhg^(-1)at 20 A g^(-1))and ultrahigh reversibility(90 mAhg^(-1)at 5Ag^(-1)after 10000cycles).

关键词： 2D carbon adsorption energy heteroatoms-doping high capacity long cycling life

Porous Carbon Matrixes Derived from Biomasses for Li-S Batteries

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Porous Carbon Matrixes Derived from Biomasses for Li-S Batte...

Research on Rotation Technique of Single-axis Rotary SINS

2017年锂硫电池前沿学术研讨会

作者： junwei wu Yanhui Cui Xiao Liang Department of Materials Science and Engineering Harbin Institute of Technology Shenzhen Graduate School

Biomass materials are abundant on the earth and can be prepared into various porous carbon matrixes which can be used as host of sulfur or interlayer to enhance performance of lithium sulfur ***,we prepare porous carbon matrixes(PCM) from cotton and luffa sponge ***,one PCM is obtained using de-waxed cotton and ZnCl as an activator,has a surface area of 1056 m g and a pore volume of 1.75 cm *** PCM is mixed with sublimed sulfur and then heated in nitrogen gas to form a carbon-sulfur 58 wt%composite which has excellent electrochemical proprieties due to large surface area and pore volume of ***,another PCM is prepared using luffa fiber as the carbon source and phosphoric acid as *** PCM shows high specific surface area(2230.0 mg) and large pore volume(2.69 cmg).The high surface area and pore volume also make high-usage of sulfur and hold high loadings of ***,the phosphate groups are introduced during activation and enhance the adsorption of polysulfide on the surface of carbon,which can effectively restrain the shuttle effect of polysulfides and improve the cycling ***,the specific capacity can reach 1224 mA h gin the first cycle and it could keep at 714 mAh g after 300 cycles at 0.2 C with high sulfur loading of 63.6 wt%.Thirdly,porous carbon matrix with an undulating material partially covering the surface(UCM) is prepared from *** undulating zones give a possible alternative to graphene as interlayer *** only the undulating zone can inhibit the shuttle effect of polysulfides,also the porous matrixes covered undulating zone can restrain polysulfides and reuse *** a result,the electrochemical results for the cathode with UCM interlayer show excellent cycling *** at 5.55 mg cm sulfur loading,the cathode with UCM interlayer can obtain an areal capacity of 3.2 mAh cmat *** a word,the methods developed here are practical and low cost which show great pote

关键词： Carbon matrixes Biomasses Interlayer Li-S batteries

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Research on Rotation Technique of Single-axis Rotary SINS

Realizing complex beams via amplitude-phase digital coding metasurfaces and semidefinite relaxation optimization

第37届中国控制会议

作者： Jun Shen Yike Cai junwei wu School of Automation Beijing Institute of Technology Beijing Automation Control Equipment Institute

Rotary modulation and control algorithms are the key technologies of the rotating strapdown inertial navigation system. The complex rotation scheme earns limited accuracy, while causing larger size, lower reliability and higher additional cost. This paper analyzed the sources of inertial sensors’ errors, compared similarities and differences, and evaluated the performance of all kinds of single-axis rotation modulation schemes. Initial alignment requires transposition in high accuracy and the rotary motor needs to stay a steady pace in actual practice under multiple interferences, so this paper designed a dual closed-loop controller for all concerned, with an ordinary PID in the position loop and ADRC controller in the speed loop,ensuring the modulation runs smoothly. The simulation results show that the system has some good characteristics such as fast response, no overshoot and good robustness. Compared with the original PID control, the new control algorithm helps rotary motor improve its anti-jamming performance.

关键词： Rotary Inertial Navigation System Single-axis Rotation Error Mitigation Active Disturbance Rejection Control

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Frontiers of Information Technology & Electronic Engineering 2023年第12期24卷 1708-1716页

作者： junwei wu Qiong HUA Hui XU Hanqing YANG Zhengxing WANG Qiang CHENG Tie Jun CUI State Key Laboratory of Millimeter Waves Southeast UniversityNanjing210096China Peng Cheng Laboratory Shenzhen518055China Pazhou Laboratory(Huangpu) Guangzhou510555China

Complex beams play important roles in wireless communications,radar,and satellites,and have attracted great interest in recent *** light of this background,we present a fast and efficient approach to realize complex beams by using semidefinite relaxation(SDR)optimization and amplitude-phase digital coding *** the application examples of this approach,complex beam patterns with cosecant,flat-top,and double shapes are designed and verified using full-wave simulations and experimental *** results show excellent main lobes and low-level side lobes and demonstrate the effectiveness of the *** with previous works,this approach can solve the complex beam-forming problem more rapidly and ***,the approach will be of great significance in the design of beam-forming systems in wireless applications.

关键词： Antenna beams Amplitude-phase coding metasurface Far-field synthesis Semidefinite relaxation