Apium-derived biochar loaded with MnFe2O4@C for excellent low frequency electromagnetic wave absorption |
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| Affiliation: | 1. School of Materials Science and Engineering, Xi''an University of Technology, Xi''an 710048, PR China;2. Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081, PR China;1. Politehnica University Timişoara, Faculty of Industrial Chemistry and Environmental Engineering, 6 Pîrvan Blv., RO-300223, Timişoara, Romania;2. Politehnica University Timişoara, Research Institute for Renewable Energy, P-ta Victoriei No.2, 300006, Timişoara, Romania;3. “Vasile Goldis” Western University of Arad, The Institute of Life Sciences, No. 86, Liviu Rebreanu Street, 310414 Arad, Romania;1. College of Science, Sichuan Agricultural University, Ya’an 625014, PR China;2. College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Ya’an 625014, PR China;3. Key Laboratory of Space Applied Physics and Chemistry (Ministry of Education), School of Science, Northwestern Polytechnical University, Xi’an 710072, PR China;1. State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, PR China;2. Guizhou Institute of Metallurgy and Chemical Engineering, Guiyang 550002, PR China |
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| Abstract: | Given the rapid development of electrommunication and radar detection technologies, low frequency electromagnetic wave materials have received more and more attention. Herein, the Apium-derived biochar loaded with MnFe2O4@C has been successfully prepared by using co-solvothermal and calcination method. The cladding carbon layer on MnFe2O4 NPs is migrated from biochar via thermal diffusion, and the biochar is covered with the ferrite NPs as well. Thus, the combination of dielectric and magnetic loss endows the composite with excellent low frequency electromagnetic absorption ability i.e. the optimal microwave absorbing intensity is −48.92 dB at 0.78 GHz with an extended effective absorbing bandwidth of 0.38–1.78 GHz for only 2.5 mm thickness, being ascribed to nature resonance, multiple interfacial and surface polarization, strong electromagnetic attenuation ability and good impedance matching property in detail. This bio-based ferrite composites have great potential in preparation of MAMs due to the advantages of extraordinary performance, lightweight property, environmental protection and easy degradation. |
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| Keywords: | Apium Biochar Manganese ferrite Electromagnetic absorption Low frequency |
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