Maria Joseph AUGUSTIN, Thangaraj BALU, Selvamony Gomathi REJITH, Arockia Raj Adaikalam ANTO; Synthesis and Characterization of Cobalt Ferrite Magnetic Nanoparticles Coated with Polyethylene Glycol; Advanced Nano-Bio-Materials and Devices; 2017:1(1):71-77

	Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by chemical co-precipitation method with capable of controlling the average particle size of CoFe2O4 magnetic nanoparticles. Further, the surface of CoFe2O4 nanoparticles was coated with sodium oleate as the primary layer and polyethylene glycol 6000 (PEG-6000) as the second layer. X-ray diffraction (XRD) indicated the sole existence of partially inverse cubic spinel phase of CoFe2O4 and the average particle size calculated from XRD of about 29 nm. SEM analysis showed that the surface modification with PEG could increase crystallinity of nanoparticles, decrease the agglomeration and control the shape to more spherical. Fourier transform infrared spectroscopy (FT-IR) analysis indicated existence of two distinct surfactants on the particle surface. In addition, the results of FT-IR indicated that the coated CoFe2O4 particles improved with the thermal stability due to the interaction between the CoFe2O4 particles and protective layers. Magnetic characterization of CoFe2O4 was studied by Electron spin resonance (ESR). The results showed that the existence PEG in the CoFe2O4 decrease the spin resonance of conduction electrons

Magnetic nanoparticles of cobalt ferrite (CoFe2O4) have been synthesized by chemical co-precipitation method with capable of controlling the average particle size of CoFe2O4 magnetic nanoparticles. Further, the surface of CoFe2O4 nanoparticles was coated with sodium oleate as the primary layer and polyethylene glycol 6000 (PEG-6000) as the second layer. X-ray diffraction (XRD) indicated the sole existence of partially inverse cubic spinel phase of CoFe2O4 and the average particle size calculated from XRD of about 29 nm. SEM analysis showed that the surface modification with PEG could increase crystallinity of nanoparticles, decrease the agglomeration and control the shape to more spherical. Fourier transform infrared spectroscopy (FT-IR) analysis indicated existence of two distinct surfactants on the particle surface. In addition, the results of FT-IR indicated that the coated CoFe2O4 particles improved with the thermal stability due to the interaction between the CoFe2O4 particles and protective layers. Magnetic characterization of CoFe2O4 was studied by Electron spin resonance (ESR). The results showed that the existence PEG in the CoFe2O4 decrease the spin resonance of conduction electrons