Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 32, Pages 29056-29064Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10018
Keywords
electrospun nanofibers; ceramic aerogels; hierarchical cellular structure; temperature-invariant superelasticity; thermal insulation
Funding
- National Natural Science Foundation of China [51873029, 51673037]
- Program of Shanghai Academic Research Leader [18XD1400200]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E00024]
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Silica aerogels are attractive for thermal insulation due to their low thermal conductivity and good heat resistance performance. However, the fabrication of silica aerogels with temperature-invariant superelasticity and ultralow thermal conductivity has remained extremely challenging. Herein, we designed and synthesized a hierarchical cellular structured silica nanofibrous aerogel by using electrospun SiO2 nanofibers (SNFs) and SiO2 nanoparticle aerogels (SNAs) as the matrix and SiO2 sol as the high-temperature nanoglue. This pathway leads to the intrinsically random deposited SNFs assembling into a fibrous cellular structure, and the SNAs are evenly distributed on the fibrous cell wall. The unique hierarchical cellular structure of the ceramic nanofibrous aerogels endows it with integrated performances of the ultralow density of similar to 0.2 mg cm(-3), negative Poisson's ratio, ultralow thermal conductivity (23.27 mW m(-1) K-1), temperature-invariant superelasticity from -196 to 1100 degrees C, and editable shapes on a large scale. These favorable multifeatures present the aerogels ideal for thermal insulation in industrial, aerospace, and even extreme environmental conditions.
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