Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (5): 523-528.doi: 10.15541/jim20160427

• Orginal Article • Previous Articles     Next Articles

Preparation, Characterization and Antimicrobial Activity of Core-satellite Ag/PDA@SiO2@CoFe2O4 Magnetic Composites

Fan LIAO1(), Jian-Qi MA1,2,3(), Hong-Guang GE2,3   

  1. 1. School of Biological Science and Engineering, Shaanxi University of Techology, Hanzhong 723001, China
    2. School of Chemical Engineering, Shaanxi University of Technology, Hanzhong 723001, China
    3. Shaanxi Province Key Laboratory of Catalytic Fundamentals and Applications, Hanzhong 723001, China
  • Received:2016-07-18 Revised:2016-09-09 Online:2017-05-20 Published:2017-05-02
  • About author:LIAO Fan. E-mail:


Monodisperse submicron CoFe2O4 spheres were prepared by solvothermal method. Polydopamine-coated silica@CoFe2O4 composite particles were synthesized by combination of Sol-Gel process and in situ self-polymerization method, in which tetraethyl orthosilicate (TEOS) and dopamine were used as the precursor for silica and polydopamine (PDA), respectively. The PDA@SiO2@CoFe2O4 composites had a multilayer core-shell structure with PDA as the outermost layer shell. Then, numerous of silver nanoparticles were assembled on the surface of PDA@SiO2@CoFe2O4 via the reduction of Ag+ by the surface PDA on the composites. The morphology, structure, and composition of the composites were characterized by transmission electron microscope (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectrometry (XPS), vibrating sample magnetometry (VSM), and inductively coupled plasma optical emission spectrometry (ICP-OES). Antibacterial experiments indicated that the as-prepared composites could restrict up to 92% Escherichia Coli (E.Coli) and Staphylococcus Aureus (S.Aureas) at 0.6 mg/mL Ag. In addition, the composites showed a strong magnetic response to an externally applied magnetic field, so it could be reused.

Key words: magnetic, polydopamine, nanocomposites, antibacterial activity

CLC Number: 

  • O649