Templated synthesis of highly ordered mesoporous cobalt ferrite and its microwave absorption properties

Abstract

Based on the nanocasting strategy, highly ordered mesoporous CoFe 2 O 4 is synthesized via the 'two-solvent' impregnation method using a mesoporous SBA-15 template. An ordered two-dimensional (P6mm) structure is preserved for the CoFe 2 O 4 /SBA-15 composite after the nanocasting. After the SBA-15 template is dissolved by NaOH solution, a mesoporous structure composed of aligned nanoparticles can be obtained, and the P6mm structure of the parent SBA-15 is preserved. With a high specific surface area (above 90 m 2 /g) and ferromagnetic behavior, the obtained material shows potential in light weight microwave absorption application. The minimum reflection loss (RL) can reach −18 dB at about 16 GHz with a thickness of 2 mm and the corresponding absorption bandwidth is 4.5 GHz.

The Effect of x Mole Ratio on Crystal Structure and Characteristic of Microwave Absorption of ZnLa_xFe_(2-x)O₄System

“…3 Reflection loss of ZnLaxFe2-xO4 system with (x = 0.0; 0.01 and 0.02) Key Engineering Materials Vol. 855 xO4(x = 0.00; 0.01and 0.02) exhibited a better performance to be applied as radar absorbing materials compared to the other research which have been done by Li Guo-Min et al who studied spinel ferrite as microwave absorbing material [19].…”