Mullite Nanosheet/Titania Nanorod/Silica Composite Aerogels for High-Temperature Thermal Insulation

Abstract

Ceramic aerogels play an essential role in the field of high-temperature insulation. However, the significant radiation heat transfer limits the practical applicability. Herein, we have chosen mullite nanosheets prepared successfully by chemical blowing as structural assembly units, modified on the surface of mullite nanosheets with TiO 2 nanorods to reduce infrared radiation heat transfer, and prepared mullite nanosheet/TiO 2 nanorod/silica composite aerogels by adding silica sols as hightemperature binder cast molding in the system. The preferred composite aerogels have good temperature resistance, and the linear shrinkage was measured to be only 2% after calcination at 1500 °C for 30 min and had a low thermal conductivity (0.0356 W•m −1 •K −1 at room temperature and 0.118 W•m −1 •K −1 at 1000 °C). This assembly concept pervades a strategy for developing porous aerogel materials for insulation and protection in extreme environments.

Anisotropic Silver Nanowires/Activated Nanofiber Aerogels for Electromagnetic Shielding

“…Aerogels are solid materials characterized by their lightweight nature and the presence of dense micropores , and are often produced by replacing liquids in hydrogels with gases. These materials possess distinctive characteristics, including remarkably low density, exceptionally high specific surface area, and reduced heat conductivity. − Consequently, interest in aerogel-based composite materials for EMI shielding has steadily mounted.…”