Lightweight Porous Electromagnetic Absorbing Materials from CO2 Foaming
Author Information
Author(s): Dong Tienan, Quan Jingru, Huang Funing, Guan Yitong, Lin Zihong, Wang Zeyao, Liu Yuheng, Hang Zusheng, Zhao Yupei, Huang Yu’an, Ehrmann Andrea
Primary Institution: School of Petrochemical Engineering, Changzhou University; School of Materials Science and Engineering, Nanjing Institute of Technology
Hypothesis
Can CO2 nucleation-free foaming improve the performance of lightweight electromagnetic absorbing materials?
Conclusion
The study successfully developed lightweight epoxy foam materials with enhanced electromagnetic wave absorption capabilities using a nucleation-free foaming process.
Supporting Evidence
- The lightweight epoxy foam achieved a minimum reflection loss of −13.25 dB and an absorption bandwidth of 3.7 GHz.
- Materials with 2.0 wt% ferrite-based agents reached a minimum reflection loss of −26.83 dB at 16.6 GHz.
- The foaming process expanded the material's volume to 4.6 times its original size.
- Fourier-transform infrared spectroscopy confirmed the formation of ammonium salts during the foaming process.
- X-ray diffraction analysis showed the materials predominantly existed in an amorphous state.
Takeaway
Researchers made a new type of lightweight foam that can absorb electromagnetic waves better by using a special process that doesn't need traditional foaming agents.
Methodology
The study used CO2 nucleation-free foaming to create porous structures in epoxy resin, incorporating carbon-based and ferrite wave-absorbing agents to optimize absorption performance.
Limitations
The high costs and need for precise control in the foaming process may limit large-scale industrial applications.
Digital Object Identifier (DOI)
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