Zhang Jianling, Liu Zhimin, Han Buxing, Li Junchun, Li Zhonghao, Yang Guanying
Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, PR China.
J Nanosci Nanotechnol. 2005 Jun;5(6):945-50. doi: 10.1166/jnn.2005.124.
In this work, a route for the synthesis of inorganic/polymer core/shell composite nanoparticles was proposed, which can be called the antisolvent-ultrasound method. Compressed CO2 was used as antisolvent to precipitate the polymer from its solution dispersed with inorganic nanoparticles, during which ultrasonic irradiation was used to induce the coating of precipitated polymers on the surfaces of the inorganic nanoparticles. TiO2/polystyrene (PS) core/shell nanocomposites have been successfully prepared using this method. The transmission electronic micrographs (TEM) of the obtained nanocomposites show that the TiO2 nanoparticles are coated by the PS shells, of which the thickness can be tuned by the pressure of CO2. The phase structure, absorption properties, and thermal stability of the composite were characterized by X-ray diffraction (XRD), UV-vis spectra, and thermogravimetry, respectively. The results of X-ray photoelectron spectra (XPS) indicate the formation of a strong interaction between PS and TiO2 nanoparticles in the resultant products. This method has some potential advantages for applications and may be easily applied to the preparation of a range of inorganic/polymer core/shell composite nanoparticles.
在这项工作中，提出了一种合成无机/聚合物核/壳复合纳米粒子的路线，可称为反溶剂-超声法。使用压缩二氧化碳作为反溶剂，使聚合物从分散有无机纳米粒子的溶液中沉淀出来，在此过程中，利用超声辐照促使沉淀的聚合物包覆在无机纳米粒子表面。采用该方法已成功制备出二氧化钛/聚苯乙烯（PS）核/壳纳米复合材料。所得纳米复合材料的透射电子显微镜（TEM）图像表明，二氧化钛纳米粒子被PS壳层包覆，其厚度可通过二氧化碳的压力进行调节。分别通过X射线衍射（XRD）、紫外-可见光谱和热重分析对复合材料的相结构、吸收特性和热稳定性进行了表征。X射线光电子能谱（XPS）结果表明，在所得产物中PS与二氧化钛纳米粒子之间形成了强相互作用。该方法在应用方面具有一些潜在优势，并且可能易于应用于制备一系列无机/聚合物核/壳复合纳米粒子。
