Magnetic, microstructure and antimicrobial investigation of Fe3O4/ZnO nano-powder and film synthesized by sol/gel and solvent evaporation in a vacuum methods
S Ghanbarnezhad, S Baghshahi, A Nemati and M Mahmoudi
Islamic Azad University, Science and Research Branch, Iran
University of Ghazvin, Ghazvin, Iran
Sharif University of Technology, Iran
Islamic Azad University, Yazd Branch, Iran
: J Nanomater Mol Nanotechnol
Abstract
Different coatings in various ways on magnetite nanoparticles increase their application such as the photocatalyst. In this research, Fe3O4 nanoparticles were covered in two different ways, sol/gel (sample S1) and solvent evaporation in a vacuum rotary device (sample S2). According to XRD patterns, ZnO peaks in the sample S2 to S1 due to film and layers formation on magnetite nano particle has increased. While in the sample S1 core/shell structure has been formed. These results were consistent with FE/SEM and TEM (core/shell structure of S1) images. Results of magnetic properties by VSM showed, on one side, all three samples (magnetite M, S1 and S2) have superparamagnetic properties, on the other side; this parameter has a direct relationship with coating process. The magnetic properties of sample S2 to S1 has decreased due to more dead layers of ZnO with different thickness. The antimicrobial experiments were carried out with 107 CFU/mL gram negative bacteria Escherichia coli and gram positive bacteria Staphylococcus aureus strains were propagated on tryptic soy agar plates. Then 20 μl of different concentration of nanoparticles suspension from 2.5-5-10-20-40-60-80 to100 mg/ml were placed on plates and incubated at 37°C for 24 h. According to the inhibition zone around film specimens, antimicrobial activity increases with increasing of the Fe3O4/ZnO nano particle concentration in sample S2 to S1. And it's more effective to staph than E. coli bacteria inhibition.
Biography
Email: solmaz.ghanbarnezhad@srbiau.ac.iir
