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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。
The surface modified CeO2 nanoparticles were synthesized. The morphology and dispersity of the surface modified CeO2 nanoparticles were observed by transmission electron microscopy (TEM) Meter and other modified CeO2 nanoparticles were characterized. The results showed that the surface modification agent stearic acid and the surface of CeO2 nanoparticles chemically bonded; the modified surface of the CeO2 nanoparticles hydrophobic organic groups, blocking the agglomeration of CeO2 nanoparticles play a dispersion; at the same time, The modified CeO2 nanoparticles in styrene stability has been improved. And the optimal ratio of modified amount of stearic acid and CeO2 nanoparticles was obtained.