Synthesis, Characterization and Antibacterial Activity of Zinc Ferrite Nanopowder (original) (raw)
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International Journal of Applied Ceramic Technology, 2019
The cobalt zinc ferrite (CZF) nanomaterials were prepared by citrate gel method, and further calcined at 600°C. The single phase cubic spinel structure of CZF was confirmed using the X-ray diffraction pattern. The average crystallite size was found to be in the range of 22 to 29 nm. The surface morphology was examined by using the scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The average particle size of Co 0.6 Zn 0.4 Fe 2 O 4 was determined to be 19 nm using TEM study which is supporting the average crystallite size measured from the X-ray diffraction studies. The Fourier Transform Infrared spectra (FTIR) revealed the two strong absorption bands in the series of ferrites between 4500-500 cm −1 and these are responsible for the characteristic of spinel ferrites. The Accepted Article This article is protected by copyright. All rights reserved. presence of elements Cu, Zn, and Co of CZF was confirmed by the elemental spectral signals of Energy Dispersive Spectroscopy (EDS). At room temperature, the magnetic measurements of pure ZnFe 2 O 4 and Co 0.6 Zn 0.4 Fe 2 O 4 were evaluated based on hysteresis curves (M-H curves). The results expressed that the addition of non-magnetic Zn 2+ ions increases the magnetic behavior in the mixed CZF samples. The antimicrobial activity of the ZnFe 2 O 4 , and Co 0.6 Zn 0.4 Fe 2 O 4 nanoferrites was tested against harmful microbes.
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Inorganic metal oxides may serve as effective disinfectants, due to their relatively non-toxic profile, chemical stability and efficient antibacterial activity. Among metal oxide nanoparticles, zinc oxide demonstrates significant bacterial growth inhibition on a broad spectrum of bacteria, mainly by catalysis of reactive oxygen species (ROS) formation from water and oxygen. Aqueous suspensions of ZnO nanoparticles (ZnO nanofluids) are the preferred formulation for using the antibacterial agent in liquid phases and for the incorporation of the nanoparticles in different commercial products. However, ZnO nanoparticles in aqueous media tend to aggregate into large flocculates, due to their hydrophobic nature, and thus do not interact with microorganisms effectively. In this study, zinc oxide was combined with iron oxide to produce magnetic composite nanoparticles with improved colloidal aqueous stability, together with adequate antibacterial activity. For this purpose, the Zn/Fe oxide composite nanoparticles were synthesized by basic hydrolysis of Fe 2+ and Zn 2+ ions in aqueous continuous phase containing gelatin. The obtained composite nanoparticles were composed of iron oxide, zinc oxide and zinc ferrite phases. The effect of the weight ratio [Zn]/[Fe] of the composite nanoparticles on their properties (composition, size, magnetic behavior and colloidal stability) was elucidated. The antibacterial activity of these nanoparticles was tested against Staphylococcus aureus and Escherichia coli and was found to be dependent on the weight ratio [Zn]/[Fe], i.e., the higher the ratio, the higher the antibacterial activity. In addition, the activity against Staphylococcus aureus was significantly higher than that observed against Escherichia coli.
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The active development of water purification functional materials based on multicomponent spinel ferrites makes it necessary to search for new efficient methods of obtaining initial nanostructured powders. In this study, a two-stage method for the synthesis of perspective pollutant absorption agents based on NixZn1−xFe2O4 (x = 0, 0.3, 0.7, 1.0) spinel ferrites are proposed and implemented. The approach is based on the synthesis of the initial powder using the solution combustion method and its subsequent thermal treatment in the air. It was found that synthesized samples are single-phase Ni-Zn ferrites with an average crystallite size of 41.4 to 35.7 nm and a degree of crystallinity of ~95–96%. The analysis of antimicrobial activity against four diverse test-cultures: Escherichia coli ATCC 11229 (non-spore-forming gram-negative), Bacillus cereus ATCC 10702 (spore-forming gram-positive), Staphylococcus citreus NCTC 9379 (non-spore-forming gram-positive), and Candida tropicalis ATCC 7...
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Synthesis, characterization and use of iron oxide nano particles for antibacterial activity
In this decade, the use of nano particles (NPs) against bacterial growth is increasing day by day due to remarkable alternative properties compared to molecular antibiotics. Thus, the use of iron oxide nanoparticles (IONPs) has proven one of the most important transition metals oxide-based remedy in nanotechnological advances and biological applications due to enriched bio-compatibility of iron. In this study synthesis of IONPs was carried out via co-precipitation method. The crystallographic morphology of the synthesized particles was studied via X-ray dif-fraction which revealed cubic structure of the particles, whereas, the spinal shaped morphology of the prepared NPs was confirmed from scanning electron microscopy. Likewise, the presence of the major elements in the sample was determined through energy dispersive X-ray analysis characterization. Bactericidal effect of the NPs was assessed at pre-defined concentrations (50 and 100 μg/ml) against Gram +ve bacteria Staphylococcus aureus, Gram −ve bacteria Shigella dysentry and Escherichia coli. Bacterial strains, which demonstrate the potential of NPs. The purpose of this study was assessing the structure of the synthesized NPs for protective effect against harmful bacterial activity. K E Y W O R D S bacteria, co-precipitation, iron oxide, nanoparticles, SEM
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In the present paper the synthesis of magnetite nanoparticles and their surface functionalization with protein has been described. Surface functionalization of these nanoparticles was confirmed using various techniques including Transmission Electron Microscopy, X-Ray Diffraction, Vibrating Scanning Magnetometry, Thermo-gravimetric studies and Fourier Transform Infrared Spectroscopy. Further, surface-functionalized magnetite nanoparticles were loaded with ciprofloxacin drug and then screened for their antibacterial activity against two gram-positive (Bacillus subtilis and Staphylococcus aureus) and two gram-negative (Pseudomonas aeruginosa and Escherichia coli) bacterial strains.