假弹性
材料科学
纳米纤维
原位
复合材料
化学工程
微观结构
有机化学
马氏体
工程类
化学
作者
Fei Wang,Lvye Dou,Jianwu Dai,Yuyao Li,Liqian Huang,Yang Si,Jianyong Yu,Bin Ding
标识
DOI:10.1002/anie.202001679
摘要
Resilient and compressible three-dimensional nanomaterials comprising polymers, carbon, and metals have been prepared in diverse forms. However, the creation of thermostable elastic ceramic aerogels remains an enormous challenge. We demonstrate an in situ synthesis strategy to develop biomimetic silica nanofibrous (SNF) aerogels with superelasticity by integrating flexible electrospun silica nanofibers and rubber-like Si-O-Si bonding networks. The stable bonding structure among nanofibers is in situ constructed along with a fibrous freeze-shaping process. The resultant SNF aerogels exhibit integrated properties of ultralow density (>0.25 mg cm-3 ), temperature-invariant superelasticity up to 1100 °C, and robust fatigue resistance over one million compressions. The ceramic nature also endows the aerogels with fire resistance and ultralow thermal conductivity. The successful synthesis of the SNF aerogels opens new pathways for the design of superelastic ceramic aerogels in a structurally adaptive and scalable form.
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