Encapsulation of SiO Nanofibers with Air Interlayer and SiC Shell for High Temperature Thermal Insulating Aerogels.

To endure extreme conditions, silica fiber aerogels are expected to maintain ultralow thermal conductivity at high temperatures. However, the weak infrared extinction capacity of SiO fiber aerogels fails to effectively suppress thermal radiation, resulting in high thermal conductivity at high temperatures. Here, SiO-air-SiC fibers with high extinction shells, air interlayer, and amorphous core are fabricated by low-pressure carbothermal reduction.

Highly Oriented SiC@SiO Ceramic Fiber Aerogels with Good Anisotropy of the Thermal Conductivity and High-Temperature Resistance.

Here electrospinning and freeze-drying techniques are combined to fabricate an anisotropic SiC@SiO ceramic fiber aerogels (A-SiC@SiO-FAs). The anisotropic structure of the A-SiC@SiO-FAs features aligned layers stacking layer-by-layer with the same direction and highly oriented 1D fibers inside each layer. The A-SiC@SiO-FAs exhibit anisotropic thermal properties with an extremely low thermal conductivity of 0.