Amino surface modification of Fe3O4/SiO2 nanoparticles for bioengineering applications

作者：Khosroshahi M E^*; Ghazanfari L

来源：Surface Engineering, 2011, 27(8): 573-580.

DOI：10.1179/1743294410Y.0000000020

• Magnetite
• Silica
• Amine
• Nanoparticle
• Modification
• Bioengineering

The purpose of this research was to synthesise Fe3O4/SiO2 nanoparticles (NPs) modified by amine groups for bioengineering applications. Magnetic iron oxide NPs were prepared via coprecipitation. The NPs were then modified with a thin layer of amorphous silica, as described by Stober. The particle surface was then terminated with amine groups. The results showed that smaller particles can be synthesised by decreasing the NaOH concentration, which, in the present case, corresponded to 35 nm using 0.9M NaOH at 750 rev min(-1) with a specific surface area of 41 m(2) g(-1). For uncoated Fe3O4 NPs, the results showed an octahedral geometry with saturation magnetisation range of 80-100 emu g(-1) and coercivity of 80-120 Oe for particles between 35 and 96 nm respectively. The Fe3O4/SiO2 NPs with 50 nm particle size demonstrated a magnetisation value of 30 emu g(-1). The stable magnetic fluid contained well dispersed Fe3O4/SiO2/3-aminopropyltriethoxysilane NPs, which indicated fast magnetic response.

• 出版日期2011-9