Published: Jan. 1, 2024

In this study, the melamine resin-based magnetic core-shell microspheres (MF@Fe3O4@SiO2) were synthesized through adsorbing Fe2+ and Ni2+ ions onto melamine-formaldehyde resin (MF) firstly, followed by phase control via ammonia-carbohydrazide, coated with SiO2 to form a corrosion-resistant outermost layer finally. The component formed complete layers thickness of 3.5 nm rough-discontinuous protrusions approximately 200 on microspheres' surface. Both experimental simulation reveals that metal coordinate N atoms in MF structures, achieving maximum load shell surface when Fe2+/Ni2+ ratio is 9:1. Moreover, outer coating enhances corrosion resistance acidic solutions significantly. To investigate EMW absorption, composite materials dielectric conductivity used MF@Fe3O4@SiO2 multi-walled carbon nanotubes (MWCNTs) as components. A significant synergistic enhancement effect absorbing was observed, filling amount F9N1-S/MWCNTs -20 30 wt.%, matching 1.76 mm, EABmax reaches 6.55 GHz, while RL -62.94 dB 1.53 mm. Furthermore, for F9N1-S/MWCNTs-30 3.24 RLmin at low frequencies -67.14 dB. microspheres, conjunction highly conductive MWCNTs, establish 3D network amplifies conduction loss, increases interface multiple reflections refractions EMW, optimizes impedance matching. This study introduces novel method producing lightweight efficient absorbers resistance.

Language: Английский