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Thermally assisted layer-layer crosslinking towards programmable evolution of pore structures for tunable
Bin Quan1,2, Yu Chen2, Litao Lin2
1School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China. binquan@nuist.edu.cn.
Nanoscale
|February 2, 2024
Summary
Researchers developed lightweight aerogel microwave absorbers using freeze-drying and in situ techniques. These materials show excellent electromagnetic wave absorption with a broad bandwidth, offering promising applications in radar cross-section reduction.
Area of Science:
- Materials Science
- Electromagnetics
- Nanotechnology
Background:
- Aerogel-based microwave absorbing materials are crucial for electromagnetic (EM) wave management.
- Developing lightweight absorbers with broad bandwidth remains a significant challenge in the field.
- Existing materials often struggle to balance absorption efficiency with material weight and frequency range.
Purpose of the Study:
- To fabricate lightweight, broad-bandwidth aerogel microwave absorbers.
- To investigate the relationship between pore structure, conductive network, and EM wave absorption properties.
- To achieve efficient electromagnetic interference (EMI) shielding and radar cross-section (RCS) reduction.
Main Methods:
- Utilized freeze-drying combined with in situ thermally structure-directing techniques to create oriented composite aerogels.
- Integrated pore structure regulation and conductive network construction for tunable EM response.
- Conducted numerical simulations for radar cross-section (RCS) analysis.
Main Results:
- The CR-3 aerogel achieved a maximum reflection loss (RL) of -50.8 dB at 2.2 mm.
- An effective absorption bandwidth of 5.4 GHz was realized at a thickness of 2.0 mm.
- Numerical simulations showed an optimal RCS reduction of 21.4 dB m² for CR-3 aerogel at a 0° detection angle.
Conclusions:
- The developed aerogel absorbers demonstrate high-performance microwave absorption over a broad frequency range.
- Simultaneous optimization of pore structure and conductive network is key to achieving efficient aerogel absorbers.
- This research offers a pathway for designing advanced aerogel-based materials for electromagnetic wave absorption applications.
