Double-negative-index ceramic aerogels for thermal superinsulation
Document Type
Article
Publication Date
2-15-2019
Abstract
Ceramic aerogels are attractive for thermal insulation but plagued by poor mechanical stability and degradation under thermal shock. In this study, we designed and synthesized hyperbolic architectured ceramic aerogels with nanolayered double-pane walls with a negative Poisson’s ratio (−0.25) and a negative linear thermal expansion coefficient (−1.8 × 10 −6 per °C). Our aerogels display robust mechanical and thermal stability and feature ultralow densities down to ~0.1 milligram per cubic centimeter, superelasticity up to 95%, and near-zero strength loss after sharp thermal shocks (275°C per second) or intense thermal stress at 1400°C, as well as ultralow thermal conductivity in vacuum [~2.4 milliwatts per meter-kelvin (mW/m·K)] and in air (~20 mW/m·K). This robust material system is ideal for thermal superinsulation under extreme conditions, such as those encountered by spacecraft.
Identifier
85061586988 (Scopus)
Publication Title
Science
External Full Text Location
https://doi.org/10.1126/science.aav7304
e-ISSN
10959203
ISSN
00368075
PubMed ID
30765563
First Page
723
Last Page
727
Issue
6428
Volume
363
Grant
51602078
Fund Ref
National Natural Science Foundation of China
Recommended Citation
Xu, Xiang; Zhang, Qiangqiang; Hao, Menglong; Hu, Yuan; Lin, Zhaoyang; Peng, Lele; Wang, Tao; Ren, Xuexin; Wang, Chen; Zhao, Zipeng; Wan, Chengzhang; Fei, Huilong; Wang, Lei; Zhu, Jian; Sun, Hongtao; Chen, Wenli; Du, Tao; Deng, Biwei; and Cheng, Gary J., "Double-negative-index ceramic aerogels for thermal superinsulation" (2019). Faculty Publications. 7783.
https://digitalcommons.njit.edu/fac_pubs/7783
