文献类型：期刊文献

英文题名：Highly Stretchable, Crack-Insensitive and Compressible Ceramic Aerogel

作者：Su, Lei[1];Wang, Hongjie[1];Jia, Shuhai[2];Dai, Sheng[3,4];Niu, Min[1];Ren, Junqiang[5];Lu, Xuefeng[5];Cai, Zhixin[1];Lu, De[1];Li, Mingzhu[1];Xu, Liang[1];Guo, Sheng-Wu[1];Zhuang, Lei[1];Peng, Kang[1]

机构：[1]Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China;[2]Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Shanghai 200237, Peoples R China;[5]Lanzhou Univ Technol, Dept Mat Sci & Engn, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China

年份：2021

卷号：15

期号：11

起止页码：18354

外文期刊名：ACS NANO

收录：;EI(收录号：20214711203832);WOS:【SCI-EXPANDED(收录号:WOS:000747115200110)】；

基金：H.W. was funded by the National Natural Science Foundation of China, the Shaanxi Innovation Capacity Support Program and the Independent Innovation Capacity Improvement Plan of Xi'an Jiaotong University. L.S. was funded by the National Natural Science Foundation of China and the China Postdoctoral Science Foundation.

语种：英文

外文关键词：ceramic aerogel; stretch; crack insensitivity; compressibility; thermal insulation

摘要：Ceramic aerogels are attractive candidates for high-temperature thermal insulation, catalysis support, and ultrafiltration materials, but their practical applications are usually limited by brittleness. Recently, reversible compressibility has been realized in flexible nanostructures-based ceramic aerogels. However, these modified aerogels still show fast and brittle fracture under tension. Herein, we demonstrate achieving reversible stretch and crack insensitivity in a highly compressible ceramic aerogel through engineering its microstructure by using curly SiC-SiOx bicrystal nanowire as the building blocks. The aerogel exhibits large-strain reversible stretch (20%) and good resistance to high-speed tensile fatigue test. Even for a prenotched sample, a reversible stretch at 10% strain is achieved, indicating good crack resistance. The aerogel also displays reversible compressibility up to 80% strain, ultralow thermal conductivity of 28.4 mW m(-1) K-1, and excellent thermal stability even at temperatures as high as 1200 degrees C in butane blow torch or as low as -196 degrees C in liquid nitrogen. Our findings show that the attractive tensile properties arise from the deformation, interaction, and reorientation of the curly nanowires which could reduce stress concentration and suppress crack initiation and growth during tension. This study not only expands the applicability of ceramic aerogels to conditions involving complex dynamic stress under extreme temperature conditions but also benefits the design of other highly stretchable and crack-resistant porous ceramic materials for various applications.