Flexible and recoverable SiC nanofiber aerogels for electromagnetic wave absorption

Abstract A novel flexible and recoverable SiC nanofiber aerogel (SiCnf aerogel) was synthesized by electrospinning and freeze-drying methods. The SiC fibers prepared by electrospinning technique, have a fine diameter (~600 nm) and excellent flexibility. On this basis, the fibers are stirred at a high-speed and then subjected to freeze-drying and high-temperature treatment to prepare a SiCnf aerogels. The fabricated SiCnf aerogels possess low density (0.039–0.041 g/cm3), excellent thermal insulation (0.025–0.031 W/(m∙K)), and mechanical properties of recoverable strain (~40%). Meanwhile, the SiCnf aerogels show excellent electromagnetic (EM) wave absorption characteristics, which have the effective absorption bandwidth of 9–11.5 GHz (reflection loss (RL)