Improved Interfacial Interactions by Core–Shell CoFe<sub>2</sub>O<sub>4</sub>@SiO<sub>2</sub> Composites to Enhance the Ability of Corrosion Resistance and Electromagnetic Wave Absorption

Authors: Shuang Wei, Tianxiang Sun, Chengcheng Ma, Hui Gao, Zhipeng Zhao, Huimeng Feng, Wen Li, Shougang Chen

Published: 2024-10-10

DOI: 10.1002/smll.202405814

Source: Full article

Abstract

AbstractWith the rapid development of science and technology, stealth and anti‐corrosion activities in oceans have attracted widespread attention. This study successfully prepares CoFe2O4@SiO2 with a core–shell structure. This core–shell structure endows the CoFe2O4@SiO2 with good impedance matching and interfacial polarization. Thus, the CoFe2O4@SiO2 exhibits an excellent electromagnetic wave absorption performance with a minimum reflection loss of −45.16 dB. Moreover, the CoFe2O4@SiO2 exhibits an excellent dispersion ability in epoxy. The corrosion resistance of the CoFe2O4@SiO2/epoxy is enhanced. After 60 days of immersion, the low‐frequency impedance modulus of the CoFe2O4@SiO2/epoxy is still >109 Ω cm2. The CoFe2O4@SiO2 realize the dual functions of stealth and anti‐corrosion, which provide ideas for developing marine stealth applications.