Preparation and characterization of SiO2/(PMMA/Fe3O4) nano particles using linolenic acid as crosslinking agent

摘要

Magnetic silica nanocomposites have the wide promising applications in the biomedical field. This paper described that Fe3O4 nanoparticles were encapsulated with methyl methacrylate (MMA) using linolenic acid (LA) as a crosslinking agent instead of oleic acid (OA). LA has three unsaturated double bonds with which it can polymerizate more easily than OA. Then, the resulting PMMA/Fe3O4 nanoparticles were coated with silica, forming SiO2/(PMMA/Fe3O4) core-shell structure particles. Finally, the nanoparticles were characterized with transmission electron microscopy and scanning electron microscope. The sizes of nanoparticles with core-shell structure were in the range from 300 to 600 nm. Narrow size distribution indicated consistent size of the particles.