Journal
ADVANCED COMPOSITES AND HYBRID MATERIALS
Volume 4, Issue 4, Pages 1281-1291Publisher
SPRINGERNATURE
DOI: 10.1007/s42114-021-00286-1
Keywords
CNFs; SiC nanowires; Aerogels; Microwave-absorbing
Funding
- National Natural Science Foundation of China [51772102, 51972114, 51902107]
- China Postdoctoral Science Foundation [2018M643074, 2019T120728]
- Fundamental Research Funds for the Central Universities [2019MS002]
- Foundation for the National Defense Key Laboratory [6142907180302]
- Natural Science Foundation of Guangdong Province [2020A1515011194, 2019B1515120013]
- Shenzhen Science and Technology Innovation Commission [JCYJ20190809111603608]
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This study fabricates carbon nanofiber (CNF) and SiC-CNF aerogel films using bacterial cellulose as scaffolds, showing excellent microwave absorption and low thermal conductivity properties. The microwave absorption properties of the aerogels are significantly enhanced by in situ growth of SiC nanowires, resulting in enhanced electromagnetic wave absorption.
Obtaining multifunctional materials with desired properties for astronautics is a challenge. In this work, carbon nanofiber (CNF) and SiC-CNF aerogel films are fabricated using bacterial cellulose as scaffolds, which offer industrial-scale production and excellent mechanical strength and stability. The produced aerogel films demonstrate excellent microwave absorption and low thermal conductivity properties. Further, the microwave absorption properties of the aerogels were significantly enhanced due to the proper impedance matching and interface polarizations following the in situ growth of SiC nanowires. In consequence, SiC-CNF aerogel films show enhanced electromagnetic wave absorption, including the minimum reflection loss of -53.3 dB and low thermal conductivity of 0.046 W/m.K at 200 degrees C. Our work can provide new insight into the fabrication of multifunctional ceramic aerogels for critical applications.
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