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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 ***,we report a facile route for synthesizing MOF/reduced GO(rGO)aerogels based on the gelation of GO,which is directly initiated using MOF *** 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 *** 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%,*** 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 *** 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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Large-scale synthesis of fluorine-free carbonyl iron-organic silicon hydrophobic absorbers with long term corrosion protection property

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Nano Research 2022年第10期15卷 9479-9491页

作者： Wei Tian Jinyao Li Yifan Liu Longjiang Deng Yang Guo Xian Jian National Engineering Researching Centre of Electromagnetic Radiation Control Materials Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of EducationState Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(Huzhou)&School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaHuzhou 313001China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China School of Electrical and Information Engineering Panzhihua UniversityPanzhihua 617000China

Environmentally-friendly magnetic metallic absorbers with high-performing antioxidant property,thermal stability,and anticorrosion capability have attracted great attention in real-world applications.A surface modification technology of magnetic metallic absorbers with dense and inert materials has been an effective strategy to solve the aforesaid ***,fluorinefree core–shell carbonyl iron-organic silicon absorbers(CI@SiO_(2)/1,1,1,3,3,3-hexamethyl disilazane(HMDS))were fabricated via a facile one-pot synthesis using tetraethyl orthosilicate(TEOS)and HMDS as the precursor of protective layer(SiO_(2)/HMDS),and CI@SiO_(2)/HMDS hybrid reveals its long-term corrosion resistance and excellent microwave absorption performance with a minimum reflection loss value of−44.3 dB and an effective absorption bandwidth of 5.3 GHz at a thin thickness of 2.0 mm after immersion in 5.0 wt.%NaCl acidic solutions for 2,160 ***,CI@SiO_(2)/HMDS hybrid can still achieve the maximum radar cross-sectional(RCS)reduction values about 16.5 dB·m^(2) at the detectionθof 0°.The exceptional microwave absorption performance and structural stability are largely due to the extraordinary wave-transparent property and shielding ability against corrosive medium of SiO_(2)/HMDS hydrophobic protective layer with a contact angle of 132.5°.The research paves the way for the large-scale and batch production of high-performance magnetic metallic absorbers and increases their survivability and reliability in the harsh environments.

关键词： microwave absorption long-term corrosion resistance carbonyl iron(CI)@SiO_(2)/1 1 1 3 3 3-hexamethyl disilazane(HMDS)hybrid core-shell radar cross-sectional simulation

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Environmentally Friendly and Multifunctional Shaddock Peel-Based Carbon Aerogel for Thermal-Insulation and Microwave Absorption

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Nano-Micro Letters 2021年第7期13卷 28-41页

作者： Weihua Gu Jiaqi Sheng Qianqian Huang Gehuan Wang Jiabin Chen Guangbin Ji College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China Shenyang Aircraft Design Institute Yangzhou Collaborative Innovation Research Institute Co. LtdShenyang 225002People’s Republic of China

Eco-friendly electromagnetic wave absorbing materials with excellent thermal infrared stealth property,heat-insulating ability and compression resistance are highly attractive in practical *** the aforesaid requirements simultaneously is a formidable ***,ultra-light carbon aerogels were fabricated via fresh shaddock peel by facile freeze-drying method and calcination process,forming porous network *** the heating platform temperature of 70℃,the upper surface temperatures of the as-prepared carbon aerogel present a slow upward *** color of the sample surface in thermal infrared images is similar to that of the *** the maximum compressive stress of 2.435 kPa,the carbon aerogels can provide favorable *** shaddock peel-based carbon aerogels possess the minimum reflection loss value(RLmin)of−29.50 dB in X ***,the effective absorption bandwidth covers 5.80 GHz at a relatively thin thickness of only 1.7 *** the detection theta of 0°,the maximum radar cross-sectional(RCS)reduction values of 16.28 dB m^(2) can be *** simulations of RCS have aroused extensive interest owing to their ingenious design and time-saving *** work paves the way for preparing multi-functional microwave absorbers derived from biomass raw materials under the guidance of RCS simulations.

关键词： Microwave absorption Thermal insulation Carbon aerogel radar cross-sectional simulation Multi-function

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