作　　者： ; ;

机构地区： 华南理工大学化学与化工学院

出　　处： 《现代化工》 2002年第3期26-30,共5页

摘　　要： 研究不同亲水亲油平衡值 (HLB)的Span80 Tween60表面活性剂复配体系对酸性水溶液微乳化增溶力的影响 ,最佳HLB值在 1 3左右 ,该体系用作超微或纳米粒子的微乳法合成体系。在水 (HNO3) /Span80 Tween60 /环己烷体系中水解硅酸乙酯(TEOS)合成了 1 1 0～ 550nm的单分散酸性超微二氧化硅粒子 ,研究了R(n水/n表)和H(n水/nTEOS)对粒径的影响 ,随着R的增大 ,粒径越小 ,达到最小值再增大 ;H越高 ,粒径越大。提出了W/O微乳体系酸催化水解TEOS合成二氧化硅粒子的过程模型 。 Effects of surfactant Span80 Tween60 mixtures with different HLB on the solubilization of acid water microemulsion are studied. The most efficient HLB is about 13. Monodisperse superfine silica particles of 110‐550 nm size were synthesized in water (HNO 3)/Span80 Tween60/cyclohexane with hydrolysis of tetraethyl orthosilicate(TEOS). Effects of R ( n w/ n s) and H ( n w/ n TEOS ) on particle size are studied. Results show that as R increases the size becomes smaller and then get larger again after reaching the minimum, and the bigger the H number, the larger the particle size. A process model of monodisperse acid silica particle with acid catalytic hydrolysis of TEOS in W/O microemulsion is proposed. It is also pointed out that polycondensation is an important way of crystal nucleus growth in the process.

关 键 词： 微乳体系 单分散酸性二氧化硅 酸催化

领　　域： [理学] [理学] [化学工程]