摘要
以硝酸作为催化剂制备二氧化硅溶胶,较详细研究了乙醇/TEOS、H2O/TEOS、HNO3/TEOS摩尔比以及反应温度对溶胶粘度的影响,并建立了溶胶粘度与各影响因素的动力学方程。结果表明,硝酸催化条件下水解反应的活化能约为2330J/mol,远低于无催化剂条件下的活化能。此外,还研究了反应温度和陈化时间对溶胶粒度分布的影响。
The silica sol catalyzed by nitric acid was investigated. The factors affecting the viscosity of the sol system were discussed in detail. A kinetic equation was proposed to depict the relation between the viscosity and the controlled factors (the ratios of TEOS to ethanol (x), water (y) and nitric acid (z), and reaction temperature). The activation energy of hydrolysis reaction was found to be 2330 J/mol, far lower than that of hydrolysis reaction without a catalyst. In addition, we also investigated the effects of reaction temperature and aging time on the particle size distribution.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第S2期99-102,共4页
Rare Metal Materials and Engineering
基金
General Armament Department “973” Program (G0201030YL030204-1)
关键词
硅溶胶
粘度
动力学方程
活化能
溶胶粒度分布
silica sol
viscosity
kinetic equation
activation energy
particle size distribution
