Abstract
Rural corn straw was incinerated as waste material or used to feed livestock in the northern farmland generally, it was selected as raw material with abundant source, sustainability and natural channel structure and iron chloride was used as iron source to prepare Fe3O4/corn straw core (F/C) composite by soaking-pyrolysis method. The electromagnetic parameters and absorbing properties of the composite were modified by changing the molar concentration of iron source. The micromorphology, structure and electromagnetic parameters of the material were characterized. The results showed that the F/C material still maintained the initial natural three-dimensional pore structure of the straw core, with the highest specific surface area of 26.45 m2/g, the pore size of 70.09 nm, and Fe3O4 particles were loaded inside and outside the pore. The impedance matching of 0.4 F/C composite is the best. When the thickness is 3.5 mm, the minimum reflection loss can reach − 30.03 dB and the effective absorption bandwidth is 4.17 GHz (7.54–11.71 GHz). The absorption loss of the material is mainly due to the synergistic effect of dielectric loss, polarization relaxation and magnetic loss. The wave absorbing material has a good application prospect and has great potential in promoting the high value and functional utilization of biological waste.
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This work is supported by the National Defense Basic Scientific Research Program.
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GC design of the work, acquired data and wrote the manuscript; JL and RL interpreted the results; GC agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
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Chen, G., Liu, J. & Liu, R. Preparation and wave-absorbing properties of low-cost Fe3O4/corn straw core composite material. J Mater Sci: Mater Electron 34, 808 (2023). https://doi.org/10.1007/s10854-023-10184-5
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DOI: https://doi.org/10.1007/s10854-023-10184-5