Study on the mechanism of large-scale microwave absorption of ferroferric oxide coated with nano-SiO2

With the continuous development of nanomaterials technology, the research on electromagnetic absorption of nanomaterials dispersed in large-scale sea has important application value. Therefore, the wave absorption mechanism of nano-silica-coated ferroferric oxide (Fe 3 O 4 @SiO 2 ) powder in large scale space is studied. By calculating the area of absorption cross-section and scattering cross-section of a single core-shell Fe 3 O 4 @SiO 2 composite particle with seawater as the background medium, and the wave absorption property of core-shell Fe 3 O 4 @SiO 2 composite particles is analyzed from the microscopic aspect. Then, the wave-absorbing properties of core-shell Fe 3 O 4 @SiO 2 composite particles dispersed in the large-scale sea with the size of 3 m are studied, and the absorbing loss is calculated, and the absorbing mechanism is further analyzed.