Preparation and characterization of magnetic Fe3O4@SiO2 composite particles
XU Longfei
ZHANG Zhili
LI Decai
ZHANG Haiming
YANG Yang
Abstract：Fe3O4 magnetic particles prepared by chemical coprecipitation and tetraethoxysilane hydrolysis method were coated with SiO2.The prepared particles were characterized by X ray diffractometer,contact angle measuring instrument,vibrating sample magnetometer and transmission electron microscopy and so on.The results show that the surface of the magnetic particles is coated with a layer of SiO2,the size of the coated particles is about 20 nm with superparamagnetic property.The contact angle decreases from 120 to 90°,and the lipophilicity is significantly enhanced.The saturation magnetization of the composite Fe3O4 particles decreases with the increase of the coating amount of SiO2,its value is 84 kA/m,which can meet the application requirements.
Keywords：magnetic particles Fe3O4amorphous SiO2superparamagneticFe3O4@SiO2 composite particles
Publication Date：2017-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 84-87 )