文献类型：期刊文献

英文题名：Strong and machinable carbon aerogel monoliths with low thermal conductivity prepared via ambient pressure drying

作者：Jia, Xianfeng[1];Dai, Bowen[1];Zhu, Zhaoxian[1];Wang, Jitong[1];Qiao, Wenming[1,2];Long, Donghui[1,2];Ling, Licheng[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab 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：2016

卷号：108

起止页码：551

外文期刊名：CARBON

收录：;EI(收录号：20163202685368);WOS:【SCI-EXPANDED(收录号:WOS:000382246300058)】；

基金：This work was partly supported by MOST (2014CB239702) and National Science Foundation of China (No. 21576090, No. 51302083, No. 51172071), and Fundamental Research Funds for the Central Universities and Shanghai Rising Star Program (15QA1401300).

语种：英文

外文关键词：Phenolic resins - Sol-gels - Resins - Drying - Porous materials - Thermal conductivity - Aerogels - Carbon

摘要：Carbon aerogels are among the most attractive porous carbon materials currently, but their real-world applications are greatly limited by their high cost, complicated preparation process and low mechanical properties. Herein, we report a very facile route to prepare lightweight but mechanically strong carbon aerogel monoliths (CAMs), through a sol-gel polymerization of linear phenolic resin and hexamethylenetetramine (HMTA), followed by ambient pressure drying and carbonization. The good capability of linear phenolic resin with ethanol could induce the formation of large polymer particle and good particle connectivity, affording robust network to suppress the collapse during the ambient drying. The synthesis is scalable and flexible, permitting a facile tailor of density, porous structure and mechanical strength by adjusting the ratio of phenolic resin to HMTA and phenolic resin concentration. The obtained CAMs possess macroporous/microporous hierarchical structure with low density as low as 0.07 g cm(-3), high mechanical strength of 0.9-5.0 MPa and low thermal conductivity (0.032-0.069 W m(-1) K-1). Further CO2 activation can greatly develop the microporosity without sacrificing the monolithic structure. Moreover, as-prepared CAMs can be fabricated in large sizes, as well as being post-machined into many shapes and sizes for potential applications. (C) 2016 Elsevier Ltd. All rights reserved.