A lightweight and high compressive resistance thermal insulation material with dual-network structure  

作　　者：Mengmeng Yang Zhaofeng Chen Yang Ding Wu Qiong Tianlong Liu Manna Li Lixia Yang Sheng Cui 

机构地区：[1]School of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China [2]Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites,Nanjing Tech University,Nanjing 211816,China

出　　处：《Nano Research》2024年第5期4279-4287,共9页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.U2167214);the Science and Technology International Cooperation Project of Jiangsu(No.BZ2021055);the Industry Foresight and Key Core Technology Competition Project of Jiangsu(No.BE2022147);the Overseas Professor Project(No.G2022181024L).

摘　　要：Ceramic fibrous aerogels are highly desirable for thermal management materials due to their high porosity,excellent elasticity,thermal conductivity,and good thermal resistance.However,the fabrication of nanofibrous aerogel with super-elasticity and good shape retention at the same time has remained challenging.To meet the requirements,a novel anisotropy nanofibrous-granular aerogel with a quasi-layered multi-arch-like and hierarchical-cellular structure is designed and prepared by vacuum-filtration-assisted freeze-drying and sintering.The quasi-layered multi-arch and flexible nanofibers endowed the aerogels with excellent mechanical robustness(ultimate stress up to 60 kPa with strain 60%)and super-elasticity with recoverable compression strain up to 60%.The introduced SiO_(2) aerogel nanoparticles and nanofibers are assembled into an arch-like structure and become the connection point of adjacent nanofibers,which endows low thermal conductivity(0.024 mW/(m·K))of composite aerogel.This novel strategy provides a fresh perspective for the preparation of nanofibrous aerogel with robust mechanical in thermal insulation and other fields.

关 键 词：nanofibrous aerogel dual-network structure thermal insulation nanofibrous-granular composite aerogels strong mechanical 

分 类 号：TB30[一般工业技术—材料科学与工程]