材料工程Issue(3)：32-37,6.
常压干燥制备疏水SiO2气凝胶的影响因素分析
Effects of Preparation Conditions on Hydrophobic Silica Aerogels via Ambient Pressure Drying
摘要
Abstract
The preparation of silica aerogel via ambient pressure drying has become of great importance recently. A key to improve the properties of aerogels is to optimize the preparation parameters. Using tetraethoxysiliane (TEOS) and methyltriethoxysilane (MTES) as the silica source and co-precursor, respectively, the hydrophobic silica aerogels via ambient pressure drying process were prepared by sol-gel method with aging and two-step surface modification by trimethylchlorosilane (TMCS)/n-hexane/ ethanol (EtOH) solutions. The BET, FT-IR, SEM, TEM and contact angle measurements were used to characterize the structure of silica aerogels. The effects of hydrolyzing time, aging time, aging temperature and surface modification reagents on the properties of silica aerogels were systematically investigated. The results revealed that the silica aerogels prepared using 16 h hydrolyzing time, 48 h aging time at 55°C and surface modified by the molar ratios of TMCS/TEOS being 1. 56 for 48 h possessed the best properties. The porosity and specific surface area were 92% and 969m2 /g, respectively, with the contact angle of 157°.关键词
SiO2气凝胶/常压干燥/溶胶-凝胶/制备条件Key words
silica aerogel/ ambient pressure drying/ sol-gel/ preparation condition分类
化学化工引用本文复制引用
罗凤钻,吴国友,邵再东,程璇,余煜玺..常压干燥制备疏水SiO2气凝胶的影响因素分析[J].材料工程,2012,(3):32-37,6.基金项目
福建省自然科学基金项目(2009J05133) （2009J05133）
特种先进材料福建省重点实验室(2006L2003) （2006L2003）
