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

doi:10.15541/jim20160427

Abstract

Abstract:

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

LIAO Fan, MA Jian-Qi, GE Hong-Guang. Preparation, Characterization and Antimicrobial Activity of Core-satellite Ag/PDA@SiO₂@CoFe₂O₄ Magnetic Composites[J]. Journal of Inorganic Materials, 2017, 32(5): 523-528.

Figures/Tables 7

Fig. 1 TEM images of magnetic nanoparticles (a, b), silica-coated magnetic nanoparticles (c, d), polydopamine coated SiO2@CoFe2O4 (e, f) and Ag/PDA@SiO2@CoFe2O4 (g, h) NPs

Fig. 2 XRD patterns of CoFe2O4 (a), PDA@SiO2@CoFe2O4(b) and Ag/PDA@SiO2@CoFe2O4(c) particles

Fig. 3 XPS spectra of the Ag/PDA@SiO2@CoFe2O4 NPs

Fig. 4 Hysteresis loops of the magnetic CoFe2O4 core, PDA@SiO2@CoFe2O4 and Ag/PDA@SiO2@CoFe2O4 NPs

Fig. 5 Inhibition zones of Sterile water, PDA@SiO2@CoFe2O4, Ag/PDA@SiO2@CoFe2O4 and Ag NPs against (a) E.Coli and (b) B.Subtilis (a1-a4, b1-b4 samples containing Ag at concentrations of 0.2, 0.4, 0.6, and 0.8 mg /mL)

Table 1 Inhibition zone diameters of the Ag/PDA@SiO2@CoFe2O4 and Ag NPs against E.coli and S.aureas (Diffusion (cm) = final inhibition zonediameter(cm)-initial diameter(cm)

Concentration/(mg·mL^-1)	E.coli Inhibition zones/cm		B.subtilis Inhibition zones/cm
Concentration/(mg·mL^-1)	B	C	B	C
0.2	0.5	0.3	0.2	0.1
0.4	0.7	0.5	0.4	0.2
0.6	0.8	0.6	0.8	0.5
0.8	1.0	0.8	1.1	0.7

Fig. 6 Images of colonies on MH agar plates cultured of E.Coli and B.Subtilis

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

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