Double-negative-index ceramic aerogels for thermal superinsulation
Xiang Xu(University of California, Los Angeles), Qiangqiang Zhang(Lanzhou University), Menglong Hao(Southeast University), Yuan Hu(California NanoSystems Institute), Zhaoyang Lin(University of California, Los Angeles), Lele Peng(University of California, Los Angeles), Tao Wang(University of California, Los Angeles), Xuexin Ren(University of California, Berkeley), Chen Wang(University of California, Los Angeles), Zipeng Zhao(University of California, Los Angeles), Chengzhang Wan(University of California, Los Angeles), Huilong Fei(University of California, Los Angeles), Lei Wang(Hunan University), Jian Zhu(Hunan University), Hongtao Sun(New Jersey Institute of Technology), Wen‐Li Chen(Harbin Institute of Technology), Tao Du(Harbin Institute of Technology), Biwei Deng(Purdue University West Lafayette), Gary J. Cheng(Purdue University West Lafayette), Imran Shakir(King Saud University), Chris Dames(Lawrence Berkeley National Laboratory), Timothy S. Fisher(California NanoSystems Institute), Xiang Zhang(University of California, Berkeley), Hui Li(Harbin Institute of Technology), Yu Huang(University of California, Los Angeles), Xiangfeng Duan(University of California, Los Angeles)
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Abstract
Elastic ceramics Aerogels hold promise as lightweight replacements for thermal insulation. However, poor mechanical stability has hampered progress in moving toward commercialization. Xu et al. designed a mechanical metamaterial that pinches in a small amount when you compress it (see the Perspective by Chhowalla and Jariwala). This is characteristic of materials with a negative Poisson's ratio and dramatically improves mechanical stability. The trick was using three-dimensional graphene structures to template the ceramic aerogels, thus producing a superinsulating material endowed with excellent mechanical properties. Science , this issue p. 723 ; see also p. 694
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