核壳型多孔氧化硅制备过程中表面活性剂的浓度调控及作用机理  

Effect Mechanism of Surfactant Concentration on the Synthesis of Core-shell Mesoporous Silica

作　　者：雷博[1] 刘卫丽[1] 

机构地区：[1]上海微系统与信息技术研究所,上海200050

出　　处：《硅酸盐通报》2015年第8期2404-2408,共5页Bulletin of the Chinese Ceramic Society

摘　　要：本文通过液晶模板法制备核壳型多孔二氧化硅,分析了多孔氧化硅在纳米颗粒表面的包覆特性。探究了表面活性剂与硅源的摩尔比(CTAB/TEOS)对多孔氧化硅壳层生长的影响,从实验上证实了多孔氧化硅壳层生长的最适摩尔浓度比随纳米颗粒尺寸的变化,并从表面活性剂与硅酸盐物种间的协同作用机制出发对此进行了阐释。利用扫描电子显微镜(SEM),透射电子显微镜(TEM),N2吸附脱附等分析方法,观察并分析了核壳多孔二氧化硅的形貌以及孔道结构。通过傅里叶变换红外光谱分析(FTIR),分析了多孔氧化硅的结构和组分。Nanoparticles with solid silica core and mesoporous silica shell were synthesized through a LCT （liquid crystalline templating ） method and the coating behavior of mesoporous silica on silica nanoparticles was investigated. It was observed that mesoporous silica can be properly coated onto the surface of silica nanoparticles only with a certain range of molar ratios of surfactants and silicates, and this optimized ratio changes with the size of silica nanoparticles, which was explained by the Cooperation Formation Mechanism. By Scanning Electron Microscope, Transmission Electron Microscope and Nitrogen adsorption-desorption analysis, the morphology and pore structure characters of the core-shell nanoparticles were studied in detail. The composition and structure of the particles was examined by Fourier Transform Infrared Spectroscopy （FTIR） analvsis.

关 键 词：多孔氧化硅 核壳结构 纳米颗粒包覆 液晶模板法 

分 类 号：TQ424[化学工程]