无水乙醇对双层油酸包覆结构中物理吸附层的影响

Influence of ethanol on the physically absorpted layer of bilayer oleic acid-coated structure

研究了无水乙醇洗涤次数对油酸包覆的Fe3O4磁性纳米颗粒表面包覆结构的影响。采用FT-IR和TGA联合表征了油酸包覆的Fe3O4磁性纳米颗粒经过无水乙醇洗涤前后表面包覆结构的变化,采用TEM观察了油酸包覆后Fe3O4磁性纳米颗粒的形貌。实验结果表明经过无水乙醇5次洗涤后,油酸包覆的Fe3O4磁性颗粒为双层包覆结构;经过无水乙醇20次洗涤后,无水乙醇将双层油酸包覆结构中的物理吸附层洗掉,造成双层油酸包覆的Fe3O4磁性颗粒演变为单层包覆结构。

The effect of washing by ethanol for different times on the surface structure of oleic acid-coated Fe3O4 nanoparticles was studied.The FT-IR and TGA were used together to study the evolution of surface structure of oleic acid-coated Fe3O4 nanomagnetic particles.TEM were used to study the morphology of the Fe3O4 magnetic nanoparticles after coated.The results showed that after five times washing,the bilayer oleic acid-coated structure was attained,while after twenty times washing,the physically absorbed secondary layer was washed away by the ethanol and the bilayer oleic acid-coated structure evolved into the single layer.