Ultralight aerogels that are both highly resilient and compressible have been fabricated from various materials including polymer, carbon, and metal. However, it has remained a great challenge to realize high elasticity in aerogels solely based on ceramic components. We report a scalable strategy to create superelastic lamellar-structured ceramic nanofibrous aerogels (CNFAs) by combining SiO2 nanofibers with aluminoborosilicate matrices. This approach causes the random-deposited SiO2 nanofibers to assemble into elastic ceramic aerogels with tunable densities and desired shapes on a large scale. The resulting CNFAs exhibit the integrated properties of flyweight densities of >0.15 mg cm−3, rapid recovery from 80% strain, zero Poisson’s ratio, and temperature-invariant superelasticity to 1100°C. The integral ceramic nature also provided the CNFAs with robust fire resistance and thermal insulation performance. The successful synthesis of these fascinating materials may provide new insights into the development of ceramics in a lightweight, resilient, and structurally adaptive form.
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机译:具有高弹性和可压缩性的超轻气凝胶已经由包括聚合物,碳和金属在内的各种材料制成。然而,仅基于陶瓷成分在气凝胶中实现高弹性仍然是巨大的挑战。我们报告了可扩展的策略,通过将SiO2纳米纤维与铝硼硅酸盐基体相结合来创建超弹性的片状结构陶瓷纳米纤维气凝胶(CNFA)。这种方法使无序沉积的SiO2纳米纤维大规模组装成具有可调密度和所需形状的弹性陶瓷气凝胶。所得的CNFA具有超过0.15 mg cm -3 sup>的飞重密度,从80%应变快速恢复,泊松比为零,温度不变的超弹性(到1100°C)的综合特性。整体陶瓷特性还为CNFA提供了强大的耐火性和隔热性能。这些引人入胜的材料的成功合成可能为轻质,弹性和结构适应性形式的陶瓷发展提供新的见解。
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