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  Scopus ID: 21100926589

Impact of Cobalt to NaOH/KOH Ratio on Properties of Cobalt Ferrites in Co-precipitation and Reverse Micelles Methods

K. Devy, M. Murugan, M. Lakshminadh, G.S.V.R.K. Choudary, M. Chaitanya Varma and Y. Aparna


Cobalt ferrite (CoFe2O4) nanoparticles were synthesized by co-precipitation and reverse micelle methods with different ratios of cobalt to sodium hydroxide (NaOH) or potassium hydroxide (KOH) (reagent). This study investigates the influence of reagents and varying cobalt to NaOH/KOH ratio on the completion of reactions and structural properties of cobalt nano-ferrites. All the samples were subjected to X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscope (TEM), thermogravimetric-differential thermal analysis, and vibrating sample magnetometer (VSM) studies to elucidate the impact of methods and reagents on structural and magnetic properties. From the as-prepared sample by co-precipitation method, the ferrite formation is observed to be completed, and the XRD pattern of the material has shown single phase spinel structure. The X-ray patterns of as-prepared samples by reverse micelles indicate a hindering mechanism to ferrite formation from the ingredients. TEM images of cobalt ferrite samples prepared by co-precipitation and reverse micelle method using NaOH, KOH show particle size in range 9 to 18 nm. The VSM study shows the saturation magnetization values ranging from 34.56 emu/g to 61.18 emu/g for the prepared samples. This shows the different methods of nanoparticle synthesis that lead to different particle sizes and magnetic properties. Antibacterial activity was tested for the synthesized nanoparticles with two-Gram positive and two-Gram negative bacteria. Out of all the compounds tested, only samples prepared by reverse micelle using KOH showed significant antibacterial activity. The other three samples showed no zones of inhibition. Among the four test isolates for same sample, maximum zone of inhibition was observed for Staphylococcus sp.

Published on: December 07, 2023
doi: 10.17756/nwj.2023-s4-082
Citation: Devy K, Murugan M, Lakshminadh M, Choudary GSVRK, Varma MC, et al. 2023. Impact of Cobalt to NaOH/KOH Ratio on Properties of Cobalt Ferrites in Co-precipitation and Reverse Micelles Methods. NanoWorld J 9(S4): S488-S493.

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