Electromagnetic wave absorption polyimide fabric prepared by coating with core–shell NiFe₂O₄@PANI nanoparticles

Abstract

The NiFe2O4@PANI/PI fabric exhibited excellent microwave attenuation performance, favorable mechanical properties and was appropriate for large-scale production.

Polypropylene Nanocomposite Filled with Spinel Ferrite NiFe2O4 Nanoparticles and In-Situ Thermally-Reduced Graphene Oxide for Electromagnetic Interference Shielding Application

“…Hence, the magnetic loss of the nanocomposites over the frequency range 6.6–7.2 GHz is associated with the eddy current loss, whereas the magnetic loss over the frequency range 5.8–6.6 GHz and 7.2–8.2 GHz is caused by natural resonance. In addition, the natural resonance loss has the following relation [69]: 2πfr=rHa Ha=4||K1/3μoMs where r , H a , | K 1 |, and M s are the gyromagnetic ratio (2.8 GHz·kOe −1 ), the anisotropic energy, the anisotropic coefficient, and the saturation magnetization, respectively. As observed in Figure 9, the M s value of the RGO-loaded nanocomposite was decreased with the increase of RGO content, indicating an increase in anisotropy energy, which was beneficial to enhancing the attenuation of the EM waves at high frequency.…”

Phosphine oxide based polyimides: structure–property relationships

“…Polymers containing phosphine oxide moieties typically display good ame resistance, high thermal oxidative stability, enhanced solubility, and improved miscibility and adhesion. 16,17 On the other hand, the incorporation of short bridges such as -CO-, -CH 2 -, -C(CF 3 ) 2into the polyimide chains has proven particularly benecial to improve the solubility. In general, such a structural modication results in decrease in glass transition temperature and crystalline melting temperature as well as signicant improvement in solubility and other processing characteristics of the polymers without greatly compromising other useful properties.…”

Polymeric textile-based electromagnetic interference shielding materials, their synthesis, mechanism and applications – A review

“…The schematic of the process is shown in Figure 19. At 0.12 mm thick coating, the fabric composite was suitable for microwaves attenuation (at 12-18 GHz) due to improved impedance matching and synergistic effect between magnetic loss from the NiFe 2 O 4 core and dielectric loss from PANI shell [203].…”