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

Yifan Zhang; Rui Cai; Dashuang Wang; Kailin Li; Qing Sun; Yuntao Xiao; Hao Teng; Xiaohan Huang; Tao Sun; Zhaohui Liu; Kexin Yao; Yuxin Zhang; Pingan Yang

doi:10.3390/molecules27031055

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

Molecules. 2022 Feb 5;27(3):1055. doi: 10.3390/molecules27031055.

Authors

Yifan Zhang¹, Rui Cai², Dashuang Wang¹, Kailin Li¹, Qing Sun³, Yuntao Xiao¹, Hao Teng¹, Xiaohan Huang⁴, Tao Sun⁴, Zhaohui Liu⁵, Kexin Yao⁵, Yuxin Zhang¹, Pingan Yang²

Affiliations

¹ College of Material Science and Engineering, Chongqing University, Chongqing 400044, China.
² School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China.
³ College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400045, China.
⁴ Department of Military Facilities, Army Logistics University of PLA, Chongqing 401311, China.
⁵ Multi-scale Porous Materials Center, Institute of Advanced Interdisciplinary Studies, School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400045, China.

Abstract

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 (RL_min) 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.

Keywords: Co2SiO4; diatomite; electromagnetic wave absorption; nanomaterial.

Abstract

Grants and funding