硬脂酸对CeO_2纳米粒子的表面修饰研究

Study on surface-modification of CeO_2 nanoparticles by stearic acid

利用表面修饰法合成了硬脂酸修饰的 CeO2 纳米粒子,采用透射电子显微镜(TEM)观察了经表面修饰的CeO2 纳米粒子的形貌及分散性,并采用红外光谱(IR)、紫外可见分光光度计等对修饰的CeO2 纳米粒子进行了表征。结果表明:表面修饰剂硬脂酸与 CeO2 纳米粒子表面之间发生了化学键合作用;修饰后的CeO2 纳米粒子表面存在疏水有机基团,阻隔了 CeO2 纳米粒子的团聚,起到了分散作用;同时,修饰后的CeO2 纳米粒子在苯乙烯中的稳定性得到了提高。并且获得了硬脂酸的修饰量与CeO2 纳米粒子的最佳配比。

CeO 2 nanoparticles modified by stearic acid were prepared using surface-mofification method. Transmission electron microscopy(TEM),infrared spectroscopy(IR),and ultraviolet spectral analysis(UV)were used to investigate the morphology and properties of the modified CeO 2 nanoparticles.The results indicate that the stearic acid is bonded to the surface of CeO 2 nanoparticles and some hydrophobic groups exist at the surface of the SA-modified CeO 2 nanoparticles,which can hold back the agglomeration of the CeO 2 nanoparticles. Moreover,the modification method improve the dispersity and stability of CeO 2 nanoparticles in styrene obviously ,and establish the optimal proportion of OA to CeO 2.