Anisotropic and hierarchical SiC@SiO <sub>2</sub> nanowire aerogel with exceptional stiffness and stability for thermal superinsulation
Lei SuDepartment of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USAHongjie WangState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. ChinaMin NiuState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. ChinaSheng DaiDepartment of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USAZhixin CaiState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. ChinaBiguo YangState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. ChinaHuaixun HuyanDepartment of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USAXiaoqing PanDepartment of Materials Science and Engineering, University of California, Irvine, Irvine, CA 92697, USA
2020en
ABI
Abstract
nanowire aerogel with a nanowire-assembled anisotropic and hierarchical microstructure was prepared by using directional freeze casting and subsequent heat treatment. The aerogel exhibits an ultralow thermal conductivity of ~14 mW/m·K, an exceptional high stiffness (a specific modulus of ~24.7 kN·m/kg), and excellent thermal and chemical stabilities even under heating at 1200°C by a butane blow torch, which makes it an ideal thermally superinsulating material for applications under extreme conditions.
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