Reversible-gel-assisted,ambient-pressure-dried,multifunctional,flame-retardant biomass aerogels with smart high-strength-elasticity transformation  

作　　者：Ting Wang Ying-Jiao Zhan Ming-Jun Chen Lei He Wen-Li An Shimei Xu Wei Wang Jian-Jun Shi Hai-Bo Zhao Yu-Zhong Wang 

机构地区：[1]College of Chemistry,The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE),National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan),State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610064,China [2]Green Preparation and Recycling Laboratory of Functional Polymeric Materials,College of Science,Xihua University,Chengdu 610039,China [3]Science and Technology on Advanced Functional Composite Laboratory,Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China

出　　处：《National Science Review》2024年第11期197-208,共12页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(52122302,U2037206 and 51991351);the Overseas Expertise Introduction Project for Discipline Innovation(111 Project)(B20001);the Sichuan Science and Technology Program(2023NSFSC1943);the Fundamental Research Funds for the Central Universities,and Institutional Research Fund from Sichuan University(2021SCUNL201).

摘　　要：Bio-based aerogels,which are poised as compelling thermal insulators,demand intricate synthesis procedures and have limited durability under harsh conditions.The integration of smart stimuli–response transitions in biomass aerogels holds promise as a solution,yet remains a challenge.Here,we introduce a pioneering strategy that employs reversible-gel-assisted ambient-pressure drying without organic solvents to craft multifunctional bio-based aerogels.By exploiting the thermally reversible gelling propensity of select biomasses,we anchor emulsified bubbles within cross-linked hydrogels,circumventing surface tension issues during mild drying.The resultant aerogels feature a robust porous matrix that is imbued with stable bubbles,yielding low thermal conductivity,high flame retardancy and robust resistance to diverse rigors.This innovative approach facilitates a paradigm shift in intelligent fire protection in which aerogels transition from robust to flexible in response to water stimuli,effectively shielding against thermal hazards and external forces.This work opens up a facile,eco-friendly and mild way to fabricate advanced biomass aerogels with stimuli-responsive transformation.

关 键 词：biomass aerogel ambient-pressure drying flame retardance solvation-controlled elastification harsh-condition resistance 

分 类 号：TK6[动力工程及工程热物理—生物能]