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Open AccessArticle

Preparation and Microwave Absorption Properties of [email protected]3O4 Magnetic Composite Microspheres

1
Aviation Key Laboratory of Science and Technology on Stealth Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China
2
Capital Aerospace Machinery Corporation Limited, Beijing 100076, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(15), 2404; https://doi.org/10.3390/ma12152404
Received: 30 April 2019 / Revised: 18 July 2019 / Accepted: 24 July 2019 / Published: 28 July 2019
(This article belongs to the Section Advanced Nanomaterials and Nanotechnology)
In this work, [email protected]3O4 magnetic microspheres were designed and prepared by a novel strategy, and the microwave absorption properties of the materials were investigated. Four kinds of monodisperse P(MAA/St) microspheres with different carboxyl content were synthesized via facile dispersion polymerization. The Fe3O4 nanoparticles were grown on the surface of P(MAA/St) to obtain P(MAA/St)@Fe3O4 microspheres. Using P(MAA/St)@Fe3O4 as the precursors, after vacuum carbonization, [email protected]3O4 were obtained. It was observed that the carboxyl content on the microspheres’ surface increased with the increasing of MAA, which made the magnetic content and maximum specific saturation magnetization of P(MAA/St)@Fe3O4 and [email protected]3O4 increase. The obtained four kinds of [email protected]3O4 microspheres had a particle size range of 4–6 μm. The microwave absorption properties indicated that the magnetic content made a difference to the microwave absorption properties of [email protected]3O4 magnetic microspheres. The microwave absorption properties of materials were determined by controlling dielectric loss, magnetic loss and impedance matching. [email protected]3O4 microspheres exhibited excellent microwave absorption properties. The maximum reflection loss could reach −45.6 dB at 12.8 GHz with 3 mm in thickness. The effective bandwidth was 5.9 GHz with RL < −10 dB. Therefore, [email protected]3O4 microspheres were lightweight and efficient microwave absorption materials. View Full-Text
Keywords: magnetic microspheres; microwave absorption; core/shell structure; dispersion polymerization; solvothermal method magnetic microspheres; microwave absorption; core/shell structure; dispersion polymerization; solvothermal method
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MDPI and ACS Style

Shi, Y.; Yin, Y.; Zhang, Y.; Hu, Y.; Liu, W. Preparation and Microwave Absorption Properties of [email protected]3O4 Magnetic Composite Microspheres. Materials 2019, 12, 2404. https://doi.org/10.3390/ma12152404

AMA Style

Shi Y, Yin Y, Zhang Y, Hu Y, Liu W. Preparation and Microwave Absorption Properties of [email protected]3O4 Magnetic Composite Microspheres. Materials. 2019; 12(15):2404. https://doi.org/10.3390/ma12152404

Chicago/Turabian Style

Shi, Youqiang; Yin, Yanan; Zhang, Yi; Hu, Yue; Liu, Weifeng. 2019. "Preparation and Microwave Absorption Properties of [email protected]3O4 Magnetic Composite Microspheres" Materials 12, no. 15: 2404. https://doi.org/10.3390/ma12152404

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