Synthesis and Antibacterial Activity of Magnetic MnFe₂O₄/Ag Composite Particles

Magnetic hollow manganese ferrite (MnFe₂O₄) nanoparticles were prepared by hydrothermal method, and their surface were modified by 3-aminopropyltriethoxysilane (APTES), then the silver ions were attached and reduced onto the surface to produce the magnetic manganese ferrite/silver (MnFe₂O₄/Ag) composite nanoparticles successfully. In addition, the MnFe₂O₄/Ag composite nanoparticles were characterized by X-ray diffraction, Transmission electron microscopy, Energy dispersive spectrometer, Magnetometer, Ultraviolet-visible spectrometer. The antimicrobial properties of the composite particles were also investigated with inhibition zone method. The results demonstrated that the parent hollow magnetic MnFe₂O₄ was not active while the composite MnFe₂O₄/Ag was active in antimicrobial property, and the inhibition zone radius of the latter against E. coli was 1.78 cm and that against S. aureus was 2.14 cm, respectively. Simultaneously, the bacteriostatic persistence evaluation of the latter showed that this kind of silver loading magnetic composite particles had high stable and persistent bacteriostatic activities.