摘要
针对现行单分散二氧化硅颗粒制备方法的粒径预见性差、步骤繁琐、收率低等问题，研究了一种用硅溶胶作为种子，在氨、水和乙醇的混合溶液中通过水解正硅酸乙酯（TEOS）生长出单分散颗粒的简便方法．该方法仅在初始的悬浮液中滴加TEOS即可使种子正常生长，无须补充氨水以修正体系浓度的变化．最终的分散相浓度可达10％（质量分数）．可选择生长的粒径范围在1微米以内并可精确控制．所得颗粒粒径分布偏差优于Stber方法．讨论了种子数密度。
A new process for preparing monodisperse silica spheres was developed to improvethe accuracy of predictable diameter of particle and simplify the experimental procedure.It involves growth of commercial silica sol particle in an original mixture solution of ammonia, waterand ethanol with continuous introduction of tetraethoxysilane and without compensation for thedecrement of water and ammonia concentrations during the formation of monodisperse spheres.The final concentration of silica can reach about 10% by weight in the reaction mixture. Thedesired diameter of the particles up to 1μm at choice can be controlled accurately. The deviationof particle size distribution was less than that of the Stober spheres. The influence of the numberdensity of reactants, temperature and the flow rate of tetracthoexy silane on the deviation of thesize distribution of final particles was investigated.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1998年第2期109-114,共6页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
高校博士点基金
