Journal
SCIENCE ADVANCES
Volume 6, Issue 26, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aay6689
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Funding
- National Natural Science Foundation of China [51772237]
- 111 Project 2.0 [BP2018008]
- Shaanxi Innovation Capacity Support Program [2018TD-031]
- Independent Innovation Capacity Improvement Plan of Xi'an Jiaotong University [PY3A033]
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Ceramic aerogels are promising lightweight and high-efficient thermal insulators for applications in buildings, industry, and aerospace vehicles but are usually limited by their brittleness and structural collapse at high temperatures. In recent years, fabricating nanostructure-based ultralight materials has been proved to be an effective way to realize the resilience of ceramic aerogels. However, the randomly distributed macroscale pores in these architectures usually lead to low stiffness and reduced thermal insulation performance. Here, to overcome these obstacles, a SiC@SiO2 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 similar to 14 mW/m.K, an exceptional high stiffness (a specific modulus of similar to 24.7 kN.m/kg), and excellent thermal and chemical stabilities even under heating at 1200 degrees C by a butane blow torch, which makes it an ideal thermally superinsulating material for applications under extreme conditions.
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