疏水性Fe_3O_4纳米粒子与双亲性嵌段共聚物(PVP-b-PMMA)的自组装

Self-assembly of hydrophobic Fe_3O_4 nanoparticles with amphiphilic block copolymer PVP-b-PMMA

以乙酰丙酮铁为铁源,用热分解法制备疏水性四氧化三铁(Fe_3O_4)纳米粒子,将N-乙烯基吡咯烷酮与甲基丙烯酸甲酯嵌段共聚物(PVP-b-PMMA)与疏水性的Fe_3O_4纳米粒子进行自组装,并采用透射电镜(TEM)、红外光谱(FT-IR)、热重(TGA)分析和动态光散射(DLS)等方法对产物结构进行表征.结果表明:所合成的Fe_3O_4纳米粒子表面物理吸附和化学键合了一层油胺分子,在二甲基甲酰胺(DMF)溶液中具有很好的分散性,且平均粒径为8.2 nm;在自组装过程中疏水性的Fe_3O_4纳米粒子能够很好地进入到胶束的内部,并均匀分散在胶束的内腔中.

The hydrophobic ferriferrous oxide（Fe3O4） nanoparticles was prepared by thermal decomposition method and iron （Ⅲ） acetylacetonate as the iron source. The hydrophobic Fe3O4 nanoparticles was self-assemblied with block copolymer（PVP-b-PMMA） synthesised by N-vinyl pyrrolidone and methyl methacrylate. The transmission elec-tron microscope （TEM）, Fourier transform infrared spectrom （FT-IR）, thermogravimetric analysis （TGA） and dynamic light scattering（DLS） Ⅲtechnologies were used to characterize the structure of the micelle self-assembled by Fe3O4 nanoparticles and PMMA-b-PVP copolymer. Experimental results showed that surface of Fe3O4 nanoparticles was covered by a layer of oleylamine molecule which was physical adsorbed and chemical bonded with it, and just the oleyl-molecule layer enable Fe3O4 nanoparticles can be dispersed well in dimethylformamide （DMF） solvent and the average diameter of Fe3O4 nanoparticles is 8.2 nm. In the process of self-assemble, the hydrophobic Fe3O4 nanoparticles were well encapsulated into the interior of the micelle and evenly dispersed uni-formly in the core of micelle.