粒径可控纳米白炭黑的制备

Preparation of Nano-Silica with Controllable Diameter

采用氨水催化正硅酸乙酯(TEOS)的水解缩聚法制备出纳米白炭黑,研究了氨浓度、反应温度对凝胶时间及纳米白炭黑粒度的影响,采用激光粒度分析仪、自动吸附仪、X射线衍射仪(XRD)、透射电子显微镜(TEM)对纳米白炭黑进行了表征。结果表明:通过控制氨浓度及制备温度,可实现对白炭黑粒径的有效控制;纳米白炭黑形貌为球形,一次粒径为20 nm左右;纳米白炭黑属于非晶结构且具备了微孔、介孔和大孔较为完整的孔体系。

Nano-silica particles were successfully prepared by the hydrolysis and condensation of tetraethyl orthosilicate （TEOS） using ammonia as a catalyst. Effects of ammonia concentration, preparing temperature on gel time and diameter of nano-silica particles were studied. Laser particle size analyzer, automatic adsorption instrument, X-ray diffractometer （XRD） and transmission electron microscope （TEM） were carried out to characterize structure and morphology of nano-silica particles. The results show that： By controlling preparing condition, nano-silica particles with controllable diameter can be prepared; Nano-siliea particles exhibit spherical structure and amorphous state, and the primary particle is 20 nm; Nano-silica particles present relatively complete pore system including microporous, mesoporous and macroporous.