文献类型：期刊文献

英文题名：Monolithic carbon aerogels within foam framework for high-temperature thermal insulation and organics absorption

作者：Wu, Kede[1];Cao, Junxiang[1];Qian, Zhen[1];Luo, Yi[1];Niu, Bo[1];Zhang, Yayun[1];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China

年份：2022

卷号：618

起止页码：259

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20221311851704);WOS:【SCI-EXPANDED(收录号:WOS:000806624900007)】；

基金：This work was financially supported by National Natural Science Foundation of China (no. 21576090 and no. 21878091), and Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Carbon aerogel; Monolith; High compressive strength; Thermal insulation; Organics absorption

摘要：Carbon aerogels exhibit high porosity, good electrical conductivity, and low thermal conductivity, but their practical applications are greatly hindered by their tedious preparation and inherent structure brittleness. Herein, monolithic carbon aerogels (MCAs) with low density and large size are prepared via a facile sol-gel polymerization of phenolic resin within melamine foam (MF), followed by ambient pressure drying and co-carbonization. During ambient pressure drying process, the MF matrix can deliver supporting force to counteract against the solvent evaporation surface tension, thus inhibiting volume shrinkage and shape deformation. Upon co-carbonization process, the MF matrix and organic aerogel could pyrolyze and shrink cooperatively, which could effectively prevent the brittle fracture of monolith. Therefore, large-sized MCAs (up to 250 x 250 x 20 mm) with low densities of 0.12-0.22 g.cm(-3) are obtained. The as-obtained MCAs possess high compressive strength (2.50 MPa), ultra-low thermal conductivity (0.051 W.m(-1).K-1 at 25 degrees C and 0.111 W.m(-1).K-1 at 800 degrees C), and high-volume organic absorption capability (77.3-88.0%, V/V). This facile and low-cost method for the fabrication of large-sized monolithic carbon aerogels with excellent properties could envision enormous potential for high-temperature thermal insulation and organics absorption. (C) 2022 Published by Elsevier Inc.