Functional Modification and Preparation of Superparamagnetic Fe3O4

Abstract

Functional modification of the surface of Fe3O4 nanoparticles was studied using silane coupling reagent A151. The modified and unmodified nanoparticles were characterized by FT-IR, XPS, TEM, DLS and VSM. Both of the unmodified and modified Fe3O4 particles show superparamagnetic behavior, and their saturation magnetic values were determined to be 81.14 emu/g and 73.0 emu/g, respectively. A151 was adsorbed on surface and formed chemical bond to be steric hindrance repulsion which prevented nanoparticles from reuniting. The dispersion properties of modified Fe3O4 particles were associated with the mass ratio of A151/Fe3O4.