Synthesis and characterization of monodisperse ultra-thin silica-coated magnetic nanoparticles.

Ming Zhang, Brian L Cushing, Charles J O'Connor

Index: Nanotechnology 19(8) , 085601, (2008)

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Abstract

A systematic study of the formation of silica-coated magnetite particles via a modified reverse microemulsion approach was investigated by using transmission electron microscopy (TEM), x-ray diffraction (XRD) and a superconducting quantum interference device (SQUID). The results show that the surfactant Igepal CO-520 played an important role in the reaction system, and the thickness of the silica shell could be controlled by the concentration of the reaction agents. The developed ultra-thin silica-coated magnetic particles with a ∼2 nm thin silica shell have a high saturated magnetization around 15 emu g(-1).