化工学报Issue(2)：648-653,6.DOI:10.11949/j.issn.0438-1157.20150600
酸碱催化剂浓度对柔性硅气凝胶性能和结构的影响
Effects of acid-base catalysts concentration on structures and properties of flexible silica aerogels
摘要
Abstract
Flexible silica aerogels with super-hydrophobicity and elasticity were successfully prepared via acid-base two-step sol-gel method, followed by supercritical drying process. They were synthesized with tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMS) as coprecursors, methyl alcohol as solvent and cetyl trimethyl ammonium bromide (CTAB) as surfactant. The influence of acid-base catalysts concentration on silica aerogels was studied in detail. Aerogels prepared with higher base concentration and lower acid concentration were found to have more uniform pore structures and narrower pore size distributions. It was observed that the optimum aerogels can be obtained with 0.01 mol·L−1 oxalic acid and 5 mol·L−1 ammonia as acid-base catalysts, respectively. The density of the as-prepared aerogel was as low as 0.135 g·cm−3, the porosity was around 93%and the specific surface area was as high as 807 m2·g−1. The maximum compression ratio of the aerogel was as high as 60%with 100%compression resilience ratio.关键词
二氧化硅/超临界干燥/表面活性剂/催化剂/弹性Key words
silica/supercritical drying/surfactants/catalyst/elasticity分类
化学化工引用本文复制引用
蔡龙,浦群,曲康,单国荣..酸碱催化剂浓度对柔性硅气凝胶性能和结构的影响[J].化工学报,2016,(2):648-653,6.基金项目
化学工程联合国家重点实验室开放课题资助项目（SKL-ChE-15D02）。@@@@supported by the State Key Laboratory of Chemical Engineering(SKL-ChE-15D02) （SKL-ChE-15D02）
