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Constructing gradient reflection and scattering porous framework in composite aerogels for enhanced microwave
Tianyi Hang1, Lijie Zhou2, Zhihui Li1
1Key Laboratory of Urban Rail Transit Intelligent Operation and Maintenance Technology & Equipment of Zhejiang Province, College of Engineering, Zhejiang Normal University, Jinhua 321004, China.
Carbohydrate Polymers
|January 29, 2024
Summary
Researchers developed a lightweight composite aerogel using cellulose nanofibril and FeCoNi@C/carbon nanotubes for advanced microwave absorption. This material offers excellent electromagnetic protection with a minimum reflection loss of -43.6 dB and a wide absorption bandwidth.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- High-performance microwave absorption (MA) materials are crucial for electromagnetic protection.
- Porous frameworks enhance MA by optimizing impedance matching and electromagnetic wave scattering.
- Developing efficient and lightweight MA materials remains a significant challenge.
Purpose of the Study:
- To fabricate a novel composite aerogel for superior microwave absorption.
- To investigate the relationship between the material's gradient porous structure and its MA performance.
- To explore the synergistic effects of multiple loss mechanisms in the composite aerogel.
Main Methods:
- Fabrication of a cellulose nanofibril (CNF)/honeycomb-like carbon-shell encapsulated FeCoNi@C/carbon nanotube (CNT) composite aerogel using a freeze-drying method.
- Characterization of the composite aerogel's gradient structure, including pores and nano-fillers.
- Evaluation of the microwave absorption performance, including minimum reflection loss (RLmin) and effective absorption bandwidth (EAB).
Main Results:
- The super-lightweight composite aerogel exhibited a unique gradient structure with varying pore sizes and nano-fillers.
- Achieved an excellent minimum reflection loss (RLmin) of -43.6 dB.
- Demonstrated a remarkable and adjustable effective absorption bandwidth (EAB) of 12.18 GHz.
Conclusions:
- The developed composite aerogel shows significant potential as a high-performance microwave absorber.
- The gradient porous structure and synergistic loss mechanisms contribute to the excellent MA capabilities.
- This work presents a viable strategy for designing advanced absorbers by leveraging gradient reflection and scattering structures.
