摘要
通过pH值、电导率和二氧化硅解离量的测定,研究了St ber二氧化硅溶胶的提纯过程.发现离心水洗很难完全去除体系中的氨水并且残留的氨水会影响二氧化硅粒子的化学稳定性.对二氧化硅溶胶进行酸处理后再提纯,可以大大加速提纯过程并消除氨水对二氧化硅粒子化学稳定性的影响.
Analyses of pH, conductivity, and dissolution of silica were carried out in order to study the purification of Stober silica sols. It was demonstrated that ammonia was hard to remove from silica sols by repeated washing with deionized water followed by centrifugation, and the residual ammonia would decrease the chemical stability of silica particles. The purification of silica sols was accelerated after acidification, and the influence of ammonia on chemical stability of silica particles was eliminated.
出处
《化学研究》
CAS
2005年第3期54-57,共4页
Chemical Research
