PEO修饰中空SiO_2纳米颗粒的制备及生长机理研究

Preparation and growth mechanism of PEO surface-modified hollow SiO_2 nanoparticles

采用基于Pluronic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15mg、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20nm和9.6nm,且具有更好的水溶性和单分散性.通过对样品的TEM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 .