In Situ Transient Construction of Fe ₃ O ₄ /Multi‐Walled Carbon Nanotubes/Meta‐Aramid Fibric Electromagnetic Shielding Materials

With the rapid advancement of mobile communications and intelligent terminal devices, the electromagnetic environment has significantly expanded, imposing higher performance demands on electromagnetic shielding materials. Based on electromagnetic synergistic effects, this study employed the DMAc/LiCl system to regulate the hydrogen‐bonding network of aramid fabrics. Through a high‐temperature oil‐bath transient construction process, nano‐Fe 3 O 4 and multi‐walled carbon nanotubes (MWCNTs) were directionally embedded onto the surface of meta‐aramid (PMIA) fibers. In this study, the DMAc/LiCl system was employed to regulate the hydrogen‐bonding network of the fabrics, thereby enabling the synergistic enhancement of electrical conductivity and electromagnetic shielding. Experiments showed that when the concentration of MWCNTs was 2.0 g/L, the X‐band (8–12 GHz) shielding efficiency of the MWCNTs/PMIA fabrics composite material reached 27.24 dB. When the ratio of Fe 3 O 4 to MWCNTs was 1:1, the shielding efficiency of the Fe 3 O 4 /MWCNTs/PMIA fabrics composite further increased to 34.36 dB, indicating that approximately 99.96% of the incident electromagnetic wave energy was attenuated, which was significantly better than those of the MWCNTs/PMIA fabric system. This study addresses the efficiency limitations of conventional aramid‐based functional composite materials through a rapid interface‐binding mechanism, offering a promising approach for flexible electromagnetic shielding fabrics and intelligent stealth applications.