Lightweight, Low-Cost Co₂SiO₄@diatomite Core-Shell Composite Material for High-Efficiency Microwave Absorption

Area of Science:

• Materials Science
• Nanotechnology
• Electromagnetics

Background:

• Electromagnetic wave absorption materials are crucial for reducing electromagnetic interference.
• Developing efficient and lightweight microwave absorbers remains a significant challenge.
• Cobalt silicate and diatomite offer unique properties for material design.

Purpose of the Study:

• To synthesize porous cobalt silicate@diatomite (Co2SiO4@diatomite) nanocomposites.
• To optimize the material composition and synthesis conditions for improved electromagnetic wave absorption.
• To evaluate the microwave absorption performance of the synthesized Co2SiO4@diatomite composites.

Main Methods:

• A two-step synthesis involving hydrothermal treatment and calcination.
• Tuning hydrothermal times to control Co2SiO4 loading in diatomite.
• Characterization of material properties and electromagnetic wave absorption performance.

Main Results:

• Successfully synthesized porous Co2SiO4@diatomite nanocomposites.
• Identified optimal synthesis conditions (6 h hydrothermal time, 25 wt% Co2SiO4 loading).
• Achieved a minimum reflection loss (RLmin) of -12.03 dB at 16.64 GHz with a 10 mm absorber thickness.
• Obtained an effective absorption bandwidth (EAB) of 1.92 GHz (RL ≤ -10 dB).

Conclusions:

• The synthesized Co2SiO4@diatomite nanocomposites exhibit excellent microwave absorption properties.
• The porous structure and composition contribute to enhanced electromagnetic wave attenuation.
• These nanocomposites are promising candidates for high-efficiency microwave absorption applications.