P EO修饰中空 Si O2纳米颗粒的制备及生长机理研究

摘要

采用基于Pluronic棆 F127胶束的软模板法，在中性、室温和无催化剂的温和环境下，制备得到中空SiO2纳米颗粒．利用透射电子显微镜（TEM）、动态光散射粒度分布测定仪（DLS）和傅里叶转换红外光谱仪（FT-IR）对所制备的中空SiO2纳米颗粒的形貌、粒径和官能团进行分析．结果表明：SiO2壳层成功在F127胶束疏水-亲水界面处形成，PEO在中空SiO2纳米颗粒表面可自由伸展，纳米颗粒的尺寸随F127浓度增加而减小，但分散性随F127浓度增加而增强．F127质量为15 mg、四甲氧基硅烷为46μL时制备的中空SiO2纳米颗粒的平均粒径和内径分别为20 nm和9．6 nm ，且具有更好的水溶性和单分散性．通过对样品的T EM照片统计分析发现，中空SiO2纳米颗粒的外径、内径和SiO2壳层厚度与F127浓度密切相关．%PEO surface-decorated hollow SiO2 nanoparticles were prepared via Pluronic® F127 based micelle soft templating method under neutral , non-catalyst mild environment in room temperature .The as-synthesized hollow SiO2 nanoparticle was characterized by transmission electron microscopy(TEM)、dynamic light scattering(DLS) and fourier transform infrared microscopy(FTIR) . The results show that the silica shell was successfully formed at the hydrophilic-hydrophobic interface and the PEO fragment extended freely on the surface of hollow SiO2 nanoparticle .The systematic experiment reveals that size of the nanoparticle decreased with the increasing of F 127 amount ,whereas the dispersibility increased .And 15 mg F127 and 46 μL tetramethoxysilane(TMOS) are the optimized condition for the preparation of water soluble and monodispersed hollow SiO 2 nanoparticle with a grain size of 20 nm and inner core size of 9 .6 nm .The further statistical analysis of TEM photographs indicates that the nanoparticle size ,inner cavity size and SiO2 shell thickness are closely related to the amount of F127 .