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Synthesis and characterization of carbonyl iron@epoxy core–shell microspheres for enhanced microwave absorption performance

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Abstract

Carbonyl iron powder (CIP) coated with a layer of epoxy (EP) shell, denoted as core–shell CIP@EP composites, were designed and prepared via in situ polymerization. The CIP@EP composites containing 4.5–6.8 wt% EP were systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, vibrating sample magnetometer, scanning and transmission electron microscopy, and vector network analyzer. The results indicated that CIP@EP composites with 9–254 nm EP shell thickness were successfully prepared through an efficient in situ polymerization method. The particle diameter of core CIP particles was 0.49–4.24 µm. The microwave absorption properties of the microspheres were then experimentally measured, and the CIP@EP composites exhibited a maximum reflection loss value of − 66.2 dB at 7.1 GHz at 2.0 mm absorber thickness. The effective absorbing bandwidth below − 10 dB was 8.0 GHz (from 10.0 to 18.0 GHz). The presence of the EP shell not only enhanced the microwave absorption performance of CIP@EP composites but also improved the overall chemical stability of CIP particles. The as-prepared CIP@EP composites may be a promising candidate for electromagnetic wave absorption applications, and the core–shell structure design can be extended to other microwave absorption materials.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51672129 and 51702158), the Fundamental Research Funds for the Central Universities (NS2017036), and Postgraduate Research and Practice Innovation Program of Jiangsu Province (KYCX18_0322).

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Authors and Affiliations

  1. College of Materials and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211100, China

    Yuxin Zuo, Zhengjun Yao, Jintang Zhou, Xinlu Guo & Haishuo Cai

  2. Key Laboratory of Material Preparation and Protection for Harsh Environment (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing, 211100, China

    Yuxin Zuo, Zhengjun Yao, Xinlu Guo & Haishuo Cai

  3. Research Institute of Aerospace Special Materials and Technology, Beijing, 100074, China

    Haiyan Lin

  4. Jiangsu Key Laboratory of Advanced Metallic Materials, Nanjing, 211100, China

    Jintang Zhou

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  1. Yuxin Zuo
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  2. Zhengjun Yao
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Zuo, Y., Yao, Z., Lin, H. et al. Synthesis and characterization of carbonyl iron@epoxy core–shell microspheres for enhanced microwave absorption performance. J Mater Sci 54, 11827–11840 (2019). https://doi.org/10.1007/s10853-019-03770-8

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