Preparation and electromagnetic microwave adsorption performances of porous nanocomposite self-assembled by CoFe2 O4 nanoparticles and diatomite

The efficient nanocomposite of CoFe2O4 diatomite for electromagnetic microwave adsorption was assembled by CoFe2O4 nanoparticles (NPs) and diatomite via a simple citric acid-nitrate sol-gel auto-combustion method. The electronic microscopy results show that the magnetic CoFe2O4 NPs are uniformly dispersed in the surface and porous structure of diatomite to form stable CoFe2O4/diatomite nanocomposite. The magnetic and dielectric properties with various mass ratios of CoFe2O4 to diatomite was investigated. It was showed that nanocomposite of CoFe2O4/ diatomite has strong superparamagnetic and electromagnetic microwave absorbing properties with optimized conditions of coercive force of 837.07 Oe, the saturation magnetization of 96.5 emu/g, and the remanence ratio (Mr/Ms) of 0.52, respectively. The maximum reflection loss is -12dB, and <-10dB frequency ranges from 10Hz to 12Hz when the ratio of CoFe2O4 to Diatomite is 1:10. The results indicate that CoFe2O4/diatomite composites can be used as the highly efficient microwave absorption materials, which expanded the application field of diatomite-based functional nanomaterials.