文献类型：期刊文献

英文题名：Molecular design of polymer precursors for controlling microstructure of organic and carbon aerogels

作者：Long, Donghui[1];Liu, Xiaojun[1];Qiao, Wenming[1];Zhang, Rui[1];Zhan, Liang[1];Ling, Licheng[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2009

卷号：355

期号：22-23

起止页码：1252

外文期刊名：JOURNAL OF NON-CRYSTALLINE SOLIDS

收录：;EI(收录号：20092612156959);WOS:【SCI-EXPANDED(收录号:WOS:000268405000011)】；

基金：This work was partly supported by National Science Foundation of China (No. 50730003 and No. 50672025), National Project of Scientific and Technical Supporting Programs Funded by Ministry of Science and Technology of China (No. 2007BAE55B00), National High Technology Research and Development Program of China (No. 2007AA05Z311), and Program for New Century Excellent Talents in University (NCET-07-0285).

语种：英文

外文关键词：Carbon; Microstructure; Porosity; Sol-gel; Aerogel and solution chemistry; Aerogels; Sol-gels (xerogels); Solution chemistry; Adsorption

摘要：Organic and carbon aerogels were prepared by sol-gel polymerization of phenol, melamine and formaldehyde, followed by supercritical drying and pyrolysis. The effect of the mole ratio of melamine/phenol (M/P) on microstructure of organic and carbon aerogels was investigated by N-2 adsorption, SEM and TEM. Coordination M/P could change the hydrophilicity and cross-linking density of polymer framework, thereby affecting polymer colloid nanoparticle nucleation and growth, and ultimately determine the 3-dimensional network of the gels. The bulk densities of organic and carbon aerogels have maxima at M/P of 0.1, which are inversely proportional to volume shrinkage of gets during drying and pyrolysis. The size of the nanoparticles; could be adjusted by varying M/P in the range from 10 to 22 nm. The mesopore volumes of organic and carbon aerogels are tailored in the range of 1.4-2.9 and 0.8-2.5 cm(3)/g, respectively. The average mesopore diameter has experienced a decreasing first and increasing afterward tendency with the increase of M/P, and exhibit a minimum at M/P of 0.1. (C) 2009 Elsevier B.V. All rights reserved.