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

• Published in: Molecules (Basel, Switzerland) Vol. 27; no. 3; p. 1055
• Main Authors: Zhang, Yifan, Cai, Rui, Wang, Dashuang, Li, Kailin, Sun, Qing, Xiao, Yuntao, Teng, Hao, Huang, Xiaohan, Sun, Tao, Liu, Zhaohui, Yao, Kexin, Zhang, Yuxin, Yang, Pingan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 05.02.2022; MDPI
• Subjects: Absorption; Biomimetic materials; Carbon; Co2SiO4; Cobalt; Composite materials; Diatomaceous earth; diatomite; Electromagnetic radiation; electromagnetic wave absorption; Microscopy; Microwave absorption; Morphology; Nanocomposites; nanomaterial; Nitrates; Plankton; Satellite communications; Silica; Spectrum analysis; United States > US; China
• ISSN: 1420-3049; 1420-3049
• DOI: 10.3390/molecules27031055

The porous and biomimetic cobalt silicate@diatomite (Co2SiO4@diatomite) was successfully synthesized by a two-step method, including the hydrothermal method and calcination to improve the electromagnetic wave absorption property. Different hydrothermal times were well-tuned for Co2SiO4@diatomite composites with different loadings of Co2SiO4. Interestingly, the Co2SiO4@diatomite composites (6 h, 25 wt%) had a smaller minimum reflection loss. Moreover, the minimum reflection loss (RLmin) could reach −12.03 dB at 16.64 GHz and the matched absorber thickness was 10 mm, while the effective absorption bandwidth (EAB, RL ≤ −10 dB) could be 1.92 GHz. In principle, such findings indicate that Co2SiO4@diatomite nanocomposites could be a promising candidate for high-efficiency microwave absorption capability.