中文摘要：

将纳米SiO2粉体通过高速剪切、强力超声和3-（甲基丙烯酰氧）丙基三甲氧基硅烷（MPS）偶联改性等手段分散于乙醇介质中,通过粒径分析（DLS）和透射电镜（TEM）考察了乙醇中SiO2的分散状态,通过红外光谱（FTIR）和热重分析（TG）表征了SiO2颗粒表面的偶联情况。发现超声分散对SiO2聚集体具有较好的解软团聚作用,但这种解团聚效果会随放置时间的延长而逐渐失效。SiO2颗粒表面偶联2%-5%的MPS后,可有效提高解软团聚效果的稳定性,相应的SiO2可在乙醇分散液中达到亚微米级的稳定均匀分散。

英文摘要：

Nanosilica powder is dispersed into ethanol media via high-speed shear mixing,ultrasonic dispersion and the coupling modification of 3-（trimethoxysilyl）propyl methacrylate（MPS）.The effects of different dispersion technologies on the dispersion of silica particles in ethanol media are systematically investigated by DLS,TEM,FTIR and TG.It is found that the deaggregation effect of ultrasonic dispersion on the silica soft aggregation was obvious but temporary.While the surface of silica particles is coupling modified by 2wt%~5wt% MPS,the deaggregation effect with high efficiency and stability can be achieved.In this condition,the MPS modified silica particles can be stably dispersed in ethanol media on submicron size level.