Highly elastic and fatigue resistant wood/silica composite aerogel operated at extremely low temperature

Advanced aerogel materials have great potential for applications in areas such as thermal insulation. However, the creation of a low-temperature resistant elastic aerogel remains a considerable challenge. Herein, we demonstrate an organic and inorganic hybrid strategy to develop a wood-based composite aerogel (wood/silica aerogels) by freeze drying. The silica nanoparticles are in situ grafted onto the wood nanofibers through the solgel method. The obtained wood/silica aerogels exhibit excellent hydrophobic (127 degrees), flame-retardant (LOI = 44%), and thermal insulation performances (0.032 W m(-1) K-1). More notably, wood/silica aerogels demonstrated elasticity and flexibility, performing torsion and elastic recovery even in liquid nitrogen (-196 degrees C). The successful synthesis of wood/silica aerogel provides a new idea for designing flexible thermal insulation materials with low temperature resistance.