Application of the obtained nanostructured composite fibers Fe3O4
Aidos L. Doszhan A. Kalamkas A. Darkhan Y.
March 2026Elsevier B.V.
Results in Materials
2026#29
Magnetite (Fe3O4) nanoparticles offer a promising approach for lightweight and effective electromagnetic interference (EMI) shielding. In this study, we synthesized Fe3O4 nanoparticles using two methods - chemical co-precipitation and liquid-phase combustion - to investigate how the synthesis method, particle properties, and filler loading influence EMI shielding performance. The co-precipitation technique produced superparamagnetic magnetite nanoparticles with a smaller size (∼10 nm) and better dispersion, while the combustion method yielded larger and more aggregated particles. These nanoparticles were added at low weight fractions (0.25–1.0 wt%) into polymer and cement matrices to create nanocomposites. Microwave transmission tests over the range 0.7–17 GHz showed that even small additions of Fe3O4 significantly attenuated EM waves. At an optimal filler content of ∼0.5 wt%, the composites achieved up to 20 dB reduction in the transmitted signal in the 1–2 GHz range. Notably, the addition of 0.25 wt% Fe3O4 to a cement composite (10 mm thick) produced approximately 21 dB attenuation at approximately 1.5 GHz, highlighting the effectiveness of shielding with an ultralow filler content. A critical threshold was identified around 0.5 wt% magnetite, beyond which increasing the nanoparticle content beyond this threshold did not produce significant broad-band improvements (due to particle agglomeration and saturation of magnetic losses). Higher loadings (1 wt%) offered only frequency-specific gains at certain bands and did not improve overall shielding performance. Comparatively, co-precipitated Fe3O4 composites outperformed those with combustion-synthesized Fe3O4 at equal filler loadings due to their finer particle size and more uniform distribution. These findings demonstrate that effective electromagnetic interference (EMI) shielding can be achieved with minimal Fe3O4 filler and optimizing nanoparticle synthesis and dispersion are key to developing high-performance, lightweight shielding materials for practical applications.
Fe3O4 , Magnetic properties , Nanoparticles , Transmission electron microscopy
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Department of General Physics, Satbayev University, Almaty, 050040, Kazakhstan
Technology Commercialization Center, Almaty Management University, Almaty, 60105120, Kazakhstan
Department of General Physics
Technology Commercialization Center
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026