Ultralight and efficient microwave absorption of SiC/SiO2 ceramic aerogels derived from biomass |
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| Affiliation: | 1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan, 610059, China;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu, Sichuan, 610059, China;3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, China;1. Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China;2. College of Mechanical Engineering, Chaohu University, Hefei, 238000, China;1. College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Rare-Earth Functional Materials and Devices Development, Baoji University of Arts and Sciences, Baoji, 721016, China;2. College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721013, China;3. School of Physics, Xidian University, Xi''an, 710071, China;1. Laboratório de Materiais Vítreos, Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil;2. Laboratório de Hematologia e Células-tronco, Faculdade de Farmácia, Universidade Federal Do Rio Grande Do Sul, 90610-000, Porto Alegre, RS, Brazil;3. Universidade Federal de Ciências da Saúde de Porto Alegre, 90050-170, Porto Alegre, RS, Brazil;4. Instituto de Pesquisa Com Células-tronco, 90020-010, Porto Alegre, RS, Brazil;5. Faculdade de Odontologia de Araçatuba, Departamento de Odontologia Preventiva e Restauradora, Universidade Estadual Paulista Júlio de Mesquita Filho, 16015-050, Araçatuba, SP, Brazil;6. Laboratório de Ensaios Antimicrobianos, Instituto de Ciências Biomédicas, Universidade Federal de Uberlândia, 38400-902, Uberlândia, MG, Brazil;1. Materials and Structures Division, NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH, 44135, USA;2. University of Toledo, Toledo, OH, USA;1. Physics Department, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia;2. Physics and Electronics Department, Adekunle Ajasin University, Akungba Akoko, Postal code 342111, Ondo State, Nigeria;3. Chemistry Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. School of Electromechanical Engineering, Lingnan Normal University, Zhanjiang, 524048, China |
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| Abstract: | Rational multicomponent regulation and microstructure design have proven to be effective strategies for achieving high performance electromagnetic wave (EMW) absorbers. Herein, the ultralight hierarchically porous SiC/SiO2 aerogels (HPSA) were successfully synthesized by an ingenious one-step method to achieve carbonization and carbothermal reduction. The composition of the HPSA and the quantity of SiC/SiO2 fibers grown by in situ reaction can be controlled by adjusting the amount of silicon source introduced. The results indicate that the composition of HPSA and the quantity of fibers have a significant effect on the EMW absorption properties. When the introduced silicon source concentration was 0.7 mol/L, the HPSA exhibited excellent EMW absorption performance, with a minimum reflection loss (RLmin) of -55.01 dB at 6.00 GHz and a maximum effective absorption bandwidth (EABmax) of 6.16 GHz. The highly interconnected porous SiC/SiO2 skeleton structure significantly contributes to the multiple reflection-absorption effect of EMW and provides available pathways for electron conduction losses. The in situ reaction generates SiC/SiO2 fibers with a large number of stacking faults and heterojunctions, which further promote the dissipation of EMW. In addition, the maximum radar cross section of HPSA under far-field conditions is reduced to 20.21 dB m2 compared to the PEC conductive layer, which implies a much lower probability of detection by radar. In brief, this work provides a reference for the use of highly efficient EMW absorbers and electromagnetic stealth materials. |
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| Keywords: | Hierarchically porous structure Multiscale interfaces Electromagnetic wave absorption Radar cross section |
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