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microwave absorption and Mechanical Properties of Short-cutted Carbon Fiber/glass Fiber Hybrid Veil Reinforced Epoxy Composites

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 248-254页

作者：陈威 ZHEN Bowen XIE Yuxuan 贺行洋 SU Ying WANG Jun WU Yan School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan 430068China Building Waterproof Engineering and Technology Research Center of Hubei Province Hubei University of TechnologyWuhan 430068China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Institute of Advanced Material Manufacturing Equipment and Technology Wuhan University of TechnologyWuhan 430070China Hubei Standardization and Quality Institute Wuhan 430061China

This work aims at investigating the microwave absorption and mechanical properties of short-cutted carbon fiber/glass fiber hybrid veil reinforced epoxy composites.The short-cutted carbon fibers(CFs)/glass fibers(GFs)hybrid veil were prepared by papermaking technology,and composites liquid molding was employed to manufacture CFs/GFs hybrid epoxy composites.The microstructure,microwave absorbing properties and mechanical properties of the hybrid epoxy composites were studied by using SEM,vector network analyzer and universal material testing,respectively.The reflection coefficient of the composites were calculated by the measured complex permittivity and permeability in the X-band(8.2-12.4 GHz)range.The optimum microwave absorption properties can be obtained when the content of CFs in the hybrid veil is 6 wt%and the thickness of the composites is 2 mm,the minimum reflection coefficient of-31.8 dB and the effective absorption bandwidth is 2.1 GHz,which is ascribed to benefitting impedance matching characteristic and dielectric loss of the carbon fiber.Simultaneously the tensile strength and modulus can achieve 104.0 and 2.98GPa,demonstrating that the CFs/GFs hybrid epoxy composites can be a promising candidate of microwave absorbing materials with high mechanical properties.

关键词： microwave absorption fiber reinforced composites papermaking carbon fiber

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microwave absorption of aluminum/hydrogen treated titanium dioxide nanoparticles

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Journal of Materiomics 2019年第1期5卷 133-146页

作者： Michael Green Peng Xiang Zhanqiang Liu James Murowchick Xinyu Tan Fuqiang Huang Xiaobo Chen Department of Chemistry University of MissourieKansas CityKansas CityMO64110USA College of Materials and Chemical Engineering Hubei Provincial Collaborative Innovation Center for New Energy MicrogridChina Three Gorges UniversityYichang443002China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Department of Geosciences University of MissourieKansas CityKansas CityMO64110USA State Key Laboratory of Rare Earth Materials Chemistry and Applications College of Chemistry and Molecular EngineeringPeking UniversityBeijing100871China

Interactions between incident electromagnetic energy and matter are of critical importance for numerous civil and military applications such as photocatalysis,solar cells,optics,radar detection,communications,information processing and transport et al.Traditional mechanisms for such interactions in the microwave frequency mainly rely on dipole rotations and magnetic domain resonance.In this study,we present the first report of the microwave absorption of Al/H2 treated TiO_(2) nanoparticles,where the A_(l)/H_(2) treatment not only induces structural and optical property changes,but also largely improves the microwave absorption performance of TiO_(2) nanoparticles.Moreover,the frequency of the microwave absorption can be finely controlled with the treatment temperature,and the absorption efficiency can reach optimal values with a careful temperature tuning.A large reflection loss of58.02 dB has been demonstrated with 3.1mm TiO_(2) coating when the treating temperature is 700℃.The high efficiency of microwave absorption is most likely linked to the disordering-induced property changes in the materials.Along with the increased microwave absorption properties are largely increased visiblelight and IR absorptions,and enhanced electrical conductivity and reduced skin-depth,which is likely related to the interfacial defects within the TiO_(2) nanoparticles caused by the Al/H2 treatment.

关键词： microwave absorption Black TiO_(2)nanoparticles Hydrogenation Aluminum reduction

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microwave absorption and bandwidth study of Y_(2)Co_(17)rare earth soft magnetic alloy with easy-plane anisotropy

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Chinese Physics B 2023年第8期32卷 310-318页

作者：马云国乔亮郑祖应郝宏波王浩孙哲涂成发王涛杨正李发伸 Institute of Applied Magnetism Key Laboratory for Magnetism and Magnetic Materials of Ministry of EducationLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou 014000China

The easy-plane anisotropy of the Y_(2)Co_(17)rare earth soft magnetic alloy has high saturation magnetization and operating frequency,and good impedance matching.Therefore,it is expected to become a kind of high-performance microwave absorbing material.In this paper,Y_(2)Co_(17)alloy was prepared by a reduction-diffusion method,and its micropowder was prepared as polyurethane(PU)based composite absorbing materials(Y_(2)Co_(17)/PU composites).The microwave properties of composites with different volume fractions were calculated.The composites showed outstanding absorption characteristics in the range of 20-30 vol%,and the minimum reflection loss(RL)was less than-50 d B.When the volume fraction was25%,the effective absorption bandwidth could cover the X-band at a thickness of 1.5 mm,and the Ku-band at a thickness of1.08 mm.The absorption mechanism was analyzed by the interface reflection model.The RL absorption peak bandwidth mechanism was discussed by using the amplitude relation and calculating the effective absorption bandwidth at different thicknesses.The effective absorption bandwidth values were in good agreement with the theoretical expectation.

关键词： reduction-diffusion method microwave absorption interface reflection model effective absorption bandwidth

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Ultralight Magnetic and Dielectric Aerogels Achieved by Metal-Organic Framework Initiated Gelation of Graphene Oxide for Enhanced microwave absorption

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Nano-Micro Letters 2022年第7期14卷 16-31页

作者： Xiaogu Huang Jiawen Wei Yunke Zhang BinBin Qian Qi Jia Jun Liu Xiaojia Zhao Gaofeng Shao Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials ScienceNanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Department of Chemical and Biological Engineering Monash UniversityVictoria 3800Australia College of Field Engineering Army Engineering University of PLANanjing 210007People’s Republic of China Hebei Key Laboratory of Inorganic Nano-Materials College of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024People’s Republic of China School of Chemistry and Environmental Engineering Yancheng Teachers UniversityYancheng 224002People’s Republic of China

The development of a convenient methodology for synthesizing the hierarchically porous aerogels comprising metal–organic frameworks(MOFs)and graphene oxide(GO)building blocks that exhibit an ultralow density and uniformly distributed MOFs on GO sheets is important for various applications.Herein,we report a facile route for synthesizing MOF/reduced GO(rGO)aerogels based on the gelation of GO,which is directly initiated using MOF crystals.Free metal ions exposed on the surface of MIL-88A nanorods act as linkers that bind GO nanosheets to a three-dimensional porous network via metal–oxygen covalent or electrostatic interactions.The MOF/rGOderived magnetic and dielectric aerogels Fe_(3)O_(4)@C/rGO and Ni-doped Fe_(3)O_(4)@C/rGO show notable microwave absorption(MA)performance,simultaneously achieving strong absorption and broad bandwidth at low thickness of 2.5(-58.1 dB and 6.48 GHz)and 2.8 mm(-46.2 dB and 7.92 GHz)with ultralow filling contents of 0.7 and 0.6 wt%,respectively.The microwave attenuation ability of the prepared aerogels is further confirmed via a radar cross-sectional simulation,which is attributed to the synergistic effects of their hierarchically porous structures and heterointerface engineering.This work provides an effective pathway for fabricating hierarchically porous MOF/rGO hybrid aerogels and offers magnetic and dielectric aerogels for ultralight MA.

关键词： Magnetic and dielectric aerogels Metal-organic frameworks Gelation mechanism microwave absorption Radar cross-sectional simulation

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Multifunctional MXene/C Aerogels for Enhanced microwave absorption and Thermal Insulation

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纳微快报:英文版 2023年第11期15卷 74-89页

作者： Fushuo Wu Peiying Hu Feiyue Hu Zhihua Tian Jingwen Tang Peigen Zhang Long Pan Michel WBarsoum Longzhu Cai ZhengMing Sun School of Materials Science and Engineering Southeast UniversityNanjing 211189People’s Republic of China Department of Materials Science&Engineering Drexel UniversityPhiladelphiaPA 19104USA The State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast UniversityNanjing 210096People’s Republic of China

Two-dimensional transition metal carbides and nitrides(MXene)have emerged as promising candidates for microwave absorption(MA)materials.However,they also have some drawbacks,such as poor impedance matching,high self-stacking tendency,and high density.To tackle these challenges,MXene nanosheets were incorporated into polyacrylonitrile(PAN)nanofibers and subsequently assembled into a three-dimensional(3D)network structure through PAN carbonization,yielding MXene/C aerogels.The 3D network effectively extends the path of microcurrent transmission,leading to enhanced conductive loss of electromagnetic(EM)waves.Moreover,the aerogel’s rich pore structure significantly improves the impedance matching while effectively reducing the density of the MXenebased absorbers.EM parameter analysis shows that the MXene/C aerogels exhibit a minimum reflection loss(RL_(min))value of−53.02 dB(f=4.44 GHz,t=3.8 mm),and an effective absorption bandwidth(EAB)of 5.3 GHz(t=2.4 mm,7.44–12.72 GHz).Radar cross-sectional(RCS)simulations were employed to assess the radar stealth effect of the aerogels,revealing that the maximum RCS reduction value of the perfect electric conductor covered by the MXene/C aerogel reaches 12.02 dB m^(2).In addition to the MA performance,the MXene/C aerogel also demonstrates good thermal insulation performance,and a 5-mm-thick aerogel can generate a temperature gradient of over 30℃ at 82℃.This study provides a feasible design approach for creating lightweight,efficient,and multifunctional MXene-based MA materials.

关键词： MXene microwave absorption Aerogel Radar cross-sectional(RCS)simulation Thermal insulation

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Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient microwave absorption and Infrared Stealth

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Nano-Micro Letters 2022年第4期14卷 142-157页

作者： Haoran Cheng Yamin Pan Xin Wang Chuntai Liu Changyu Shen Dirk W.Schubert Zhanhu Guo Xianhu Liu Key Laboratory of Advanced Material Processing&Mold(Ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002People’s Republic of China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research hotspot.Here,the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam(MF)through electrostatic self-assembly and dip-coating adsorption process,realizing the integration of microwave absorption,infrared stealth,and flame retardant.Remarkably,the Ni/MXene-MF achieves a minimum reflection loss(RLmin)of−62.7 dB with a corresponding effective absorption bandwidth(EAB)of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 mm.Strong electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks,which provided excellent impedance matching,dielectric loss,magnetic loss,interface polarization,and multiple attenuations.In addition,the Ni/MXene-MF endows low density,excellent heat insulation,infrared stealth,and flame-retardant functions.This work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.

关键词： Ni-MXene/Melamine foam microwave absorption Heat insulation Infrared stealth Flame-retardant

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Hierarchical Ti_(3)C_(2)T_(x)@ ZnO Hollow Spheres with Excellent microwave absorption Inspired by the Visual Phenomenon of Eyeless Urchins

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Nano-Micro Letters 2022年第5期14卷 62-76页

作者： Yan‑Qin Wang Hai‑Bo Zhao Jin‑Bo Cheng Bo‑Wen Liu Qiang Fu Yu‑Zhong Wang Collaborative Innovation Center for Eco‑Friendly and Fire‑Safety Polymeric Materials(MoE) State Key Laboratory of Polymer Materials EngineeringNational Engineering Laboratory for Eco‑Friendly Polymer Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064People’s Republic of China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China

Ingenious microstructure design and rational composition selection are effective approaches to realize high-performance microwave absorbers,and the advancement of biomimetic manufacturing provides a new strategy.In nature,urchins are the animals without eyes but can“see”,because their special structure composed of regular spines and spherical photosensitive bodies“amplifies”the light-receiving ability.Herein,inspired by the above phenomenon,the biomimetic urchin-like Ti_(3)C_(2)T_(x)@ZnO hollow microspheres are rationally designed and fabricated,in which ZnO nanoarrays(length:~2.3μm,diameter:~100 nm)as the urchin spines are evenly grafted onto the surface of the Ti_(3)C_(2)T_(x) hollow spheres(diameter:~4.2μm)as the urchin spherical photosensitive bodies.The construction of gradient impedance and hierarchical heterostructures enhance the attenuation of incident electromagnetic waves.And the EMW loss behavior is further revealed by limited integral simulation calculations,which fully highlights the advantages of the urchin-like architecture.As a result,the Ti_(3)C_(2)T_(x)@ZnO hollow spheres deliver a strong reflection loss of−57.4 dB and broad effective absorption bandwidth of 6.56 GHz,superior to similar absorbents.This work provides a new biomimetic strategy for the design and manufacturing of advanced microwave absorbers.

关键词： Bioinspired Hierarchical heterostructures Ti_(3)C_(2)T_(x)MXene ZnO nanoarrays microwave absorption

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microwave absorption properties regulation and bandwidth formula of oriented Y_(2)Fe_(17)N_(3-δ)@SiO_(2)/PU composite synthesized by reduction-diffusion method

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Chinese Physics B 2022年第11期31卷 341-351页

作者：王浩乔亮郑祖应郝宏波王涛杨正李发伸 Institute of Applied Magnetism Key Laboratory for Magnetism and Magnetic Materials of Ministry of EducationLanzhou UniversityLanzhou 730000China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou 014000China

As concepts closely related to microwave absorption properties,impedance matching and phase matching were rarely combined with material parameters to regulate properties and explore related mechanisms.In this work,reduction–diffusion method was innovatively applied to synthesize rare earth alloy Y_(2)Fe_(17).In order to regulate the electromagnetic parameters of absorbers,the Y_(2)Fe_(17)N_(3-δ)particles were coated with silica(Y_(2)Fe_(17)N_(3-δ)@SiO_(2))and absorbers with different volume fractions were prepared.The relationship between impedance matching,matching thickness,and the strongest reflection loss peak(RLmin)was presented obviously.Compared to the microwave absorption properties of Y_(2)Fe_(17)N_(3-δ)/PU absorber,Y_(2)Fe_(17)N_(3-δ)@SiO_(2)/PU absorbers are more conducive to the realization of microwave absorption material standards which are thin thickness,light weight,strong absorbing intensity,and broad bandwidth.Based on microwave frequency bands,the microwave absorption properties of the absorbers were analyzed and the related parameters were listed.As an important parameter related to perfect matching,reflection factor(√ε_(r)/μ_(r))was discussed combined with microwave amplitude attenuation.According to the origin and mathematical model of bandwidth,the formula of EAB(RL<-10 dB)was derived and simplified.The calculated bandwidths agreed well with experimental results.

关键词： microwave absorption rare earth alloy reduction-diffusion method Y_(2)Fe_(17)N_(3-δ)@SiO_(2) reflection factor impedance and phase matching bandwidth formula

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Influence of A-site doping barium on structure,magnetic and microwave absorption properties of LaFeO_(3)ceramics powders

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Journal of Rare Earths 2022年第7期40卷 1106-1117页

作者： Lei Huang Lichun Cheng Shunkang Pan Qingrong Yao Qianxin Long Man Wang Yucheng Chen Huaiying Zhou School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

In this paper,the effect of Ba^(2+)ions A-site doping LaFeO_(3)on structure,magnetic properties and microwave absorption properties was investigated by the sol-gel method.According to the TEM and FullProf refinement results,the structure of LaFeO_(3)changes from orthogonal(SG:Pnma)to cubic(SG:Pm-3 m)when the Ba doping amount is x=0.4.The SEM image shows that the particles size tends to decrease with the increase of Ba content.The production of weak ferromagnetism indicates that Ba doping has a significant effect on the magnetic properties of LaFeO_(3).The Neel temperature(TN)decreases significantly with the increase of Ba doping amount.An appropriate amount of Ba doping can effectively increase the dielectric and magnetic loss of LaFeO_(3)ceramics powders.The increase permittivity(ε’andε″)may be attributed to the hopping of the electrons between the Fe^(3+)and Fe^(4+)ions with the Ba^(2+)ions doping.The minimum reflection loss(RL_(min))of La_(0.9)Ba_(0.1)FeO_(3)at 6.72 GHz reaches-30.04 dB,its effective bandwidth(RL≤-10 dB)is 2.1 GHz,and the matching thickness is only 3.2 mm.These results indicate that Ba doping can effectively control the microwave absorption properties of LaFeO_(3),especially in the Cband.

关键词： LaFeO_(3)ceramics Crystal structure Magnetic Electromagnetic parameters microwave absorption Rare earths

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In-situ grown Ni Co bimetal anchored on porous straw-derived biochar composites with boosted microwave absorption properties

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 515-524页

作者： Yuanyuan Zhou Zhongyi Bai Xiangyang Yang Wei Liu Bingbing Fan Zhikai Yan Xiaoqin Guo Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China School of Chemical&Environmental Engineering China University of Mining&Technology(Beijing)Beijing 100083China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China

With the gradually increasing protection awareness about electromagnetic pollution,the demand for absorbing materials with renewability and environmental friendliness has attracted widespread attention.In this work,composites consisting of straw-derived biochar combined with NiCo alloy were successfully fabricated through high-temperature carbonization and subsequent hydrothermal reaction.The electromagnetic parameters of the porous biocarbon/NiCo composites can be effectively modified by altering their NiCo content,and their improved absorbing performance can be attributed to the synergy effect of magnetic-dielectric characteristics.An exceptional reflection loss of-27.0 dB at 2.2 mm thickness and an effective absorption bandwidth of 4.4 GHz(11.7-16.1 GHz)were achieved.These results revealed that the porous biocarbon/NiCo composites could be used as a new generation absorbing material because of their low density,light weight,excellent conductivity,and strong absorption.

关键词： straw-derived biochar microwave absorption interfacial polarization magnetic loss bimetallic NiCo impedance matching

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