Cabbage-like flexible fluororubber/carbon aerogel hybrids with negative Poisson’s ratios and excellent microwave absorption

气凝胶 材料科学 碳纳米管 石墨烯 复合材料 碳纤维 吸收(声学) 微波食品加热 热导率 氧化物 热阻 化学工程 纳米技术 复合数 传热 物理 量子力学 工程类 冶金 热力学
作者
Chi Yu,Binglin Xie,Xianhua Yao,Nan Hu,Jin Guo,Xiang Jiang,Andrew T. Smith,Luyi Sun
出处
期刊:Matter [Elsevier]
卷期号:6 (12): 4321-4338
标识
DOI:10.1016/j.matt.2023.10.010
摘要

Carbon aerogels have excellent heat resistance and electrical conductivity, but their poor structural integrity significantly limits their applications. We design a stable carbon nanotube (CNT)/graphene oxide (GO)-based carbon aerogel with a “cabbage-like” structure that is created through initial hydrogel formation via hydrothermal annular convection to realize the self-assembly of GO nanosheets and CNTs, followed by freeze drying of the hydrogel. The formed carbon aerogel is subsequently modified by a fluororubber solution to achieve both physical coating and hydrogen bonding between the thin fluororubber film and the aerogel. Thanks to the unique cabbage-like architecture and porous structure stabilized and protected by the fluororubber film, the resultant fluororubber/carbon aerogel (FCGA) hybrids possess unique mechanical properties, including negative Poisson’s ratios during compression and superior compressibility. Besides, FCGA hybrids have a low thermal conductivity, outstanding fire resistance, and exceptional microwave-absorption performance. Therefore, FCGA hybrids are promising for applications in flexible/wearable electronics, microwave absorption, etc.
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