Anisotropic and hierarchical SiC@SiO <sub>2</sub> nanowire aerogel with exceptional stiffness and stability for thermal superinsulation
Lei Su, Hongjie Wang, Min Niu, Sheng Dai, Zhixin Cai, Biguo Yang, Huaixun Huyan, Xiaoqing Pan
Abstract
nanowire aerogel with a nanowire-assembled anisotropic and hierarchical microstructure was prepared by using directional freeze casting and subsequent heat treatment. The aerogel exhibits an ultralow thermal conductivity of ~14 mW/m·K, an exceptional high stiffness (a specific modulus of ~24.7 kN·m/kg), and excellent thermal and chemical stabilities even under heating at 1200°C by a butane blow torch, which makes it an ideal thermally superinsulating material for applications under extreme conditions.
Topics & Concepts
AerogelMaterials scienceAnisotropyMicrostructureStiffnessComposite materialCeramicThermal stabilityThermalNanowireNanotechnologyOpticsChemical engineeringPhysicsMeteorologyEngineeringAerogels and thermal insulationSurface Modification and SuperhydrophobicitySupercapacitor Materials and Fabrication