纳米氧化硅制备的成核过程:Ⅱ.成核阶段的可视化研究  

Nucleation Process of the Silica Nanoparticles:Ⅱ.Visualization of the Nucleation Stage

作　　者：任高远[1,2] 苏宏久 王树东[1] REN Gaoyuan;SU Hongjiu;WANG Shudong(Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;Energy College,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院大学能源学院,北京100049

出　　处：《材料导报》2022年第12期61-65,共5页Materials Reports

摘　　要：在自然界中二氧化硅颗粒大都属于非晶态物质,非晶态物质成核过程中的形貌是不规则并且不可控的。因此研究氧化硅颗粒成核的过程对控制纳米颗粒的生长有着重大的意义。本工作以水玻璃为原料,采用离子交换法制备纳米二氧化硅颗粒。在制备过程中,对纳米氧化硅的成核过程进行了可视化研究。结合透射电子显微镜(TEM)、动态光散射(DLS)以及pH等检测手段,对纳米氧化硅颗粒晶核形成的全过程进行了细致的研究和分析。研究表明,纳米氧化硅颗粒的成核过程需要经历预备期、过渡期、成核期和生长期四个阶段;不同阶段,纳米氧化硅的形貌差异较大并且持续时间不同,整个过程可以持续6 h以上。Most silica belongs to noncrystalline phase in nature and the morphology of amorphous materials is irregular and uncontrollable during nucleation.However,nucleation process of silica particles is significant for controlling the morphology of nanoparticles.In this work,silica nanoparticles were prepared by ion exchange method with the sodium silicate as the raw material.During the synthetization process,the nucleation process of silica nanoparticles was investigated by visualization characterization like transmission electron microscope(TEM),dynamic light scattering(DLS)and pH detection.It was found that there were four stages in the nucleation of silica nanoparticles,the preparatory stage,the transitional stage,the nucleation stage and the growth stage.The morphology of different stages is different and the duration is different as well.The whole process can last more than 6 h.

关 键 词：二氧化硅 透射电子显微镜 成核 

分 类 号：TQ11[化学工程—无机化工]