@article{f5c4d4f7b251413790a683c59637c28e,
title = "Double-negative-index ceramic aerogels for thermal superinsulation",
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{\textquoteright}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.",
author = "Xiang Xu and Qiangqiang Zhang and Menglong Hao and Yuan Hu and Zhaoyang Lin and Lele Peng and Tao Wang and Xuexin Ren and Chen Wang and Zipeng Zhao and Chengzhang Wan and Huilong Fei and Lei Wang and Jian Zhu and Hongtao Sun and Wenli Chen and Tao Du and Biwei Deng and Cheng, {Gary J.} and Imran Shakir and Chris Dames and Fisher, {Timothy S.} and Xiang Zhang and Hui Li and Yu Huang and Xiangfeng Duan",
note = "Funding Information: We thank C. Jia, Y. Wang, Z. Feng, F. Song, L. Mei, and H. Jing for their help in the laboratory. Funding: X.D. is supported by National Science Foundation DMR1508144. Y.H. is supported by National Science Foundation EFRI-1433541. X.X. acknowledges funding from National Natural Science Foundation of China (grants 51602078 and 51878227). H.L. acknowledges funding from National Key Research and Development Program of China (2018YFC0705600). Q.Z. acknowledges funding from Science Fund for Distinguished Young Scholars of Gansu Province (grant 18JR3RA263). C.D. is supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Building Technologies Program, of the U.S. Department of Energy (contract DEAC02-05CH11231). G.J.C. acknowledges funding from NIST Intelligent Systems Division, NSF (CMMI 1741100), and Office of Naval Research NEPTUNE program. I.S. thanks the Deanship of Scientific Research at King Saud University for its funding of the research through grant PEJP-17-01. X.Z. acknowledges funding from the Office of Naval Research (ONR) MURI program (grant N00014-13-1-0631). Publisher Copyright: {\textcopyright} 2019 American Association for the Advancement of Science. All Rights Reserved.",
year = "2019",
month = feb,
day = "15",
doi = "10.1126/science.aav7304",
language = "English (US)",
volume = "363",
pages = "723--727",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6428",
}