Effect of chitosan coating on the structural and magnetic properties of MnFe2O4 and Mn0.5Co0.5Fe2O4 nanoparticles

Abstract

We report the influence of polymer coatings on structural and magnetic properties of MnFe2O4 and Mn0.5Co0.5Fe2O4 nanoferrites synthesized by glycol thermal technique and then coated with chitosan viz. CHI-MnFe2O4 and CHI-Mn0.5Co0.5Fe2O4. The compounds were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), high-resolution scanning electron microscopy (HRSEM), Mössbauer spectroscopy and magnetization measurements. The powder XRD patterns of naked nanoferrites confirmed single-phase spinel cubic structure with an average crystallite size of 13 nm, while the coated samples exhibited an average particle size of 15 nm. We observed a reduction in lattice parameters with coating. HRTEM results correlated well with XRD results. 57Fe Mössbauer spectra showed ordered magnetic spin states in both nanoferrites. This study shows that coatings have significant effects on the structural and magnetic properties of Mn-nanoferrites. Magnetization studies performed at room temperature in fields up to 14 kOe revealed the superparamagnetic nature of both naked and coated nanoparticles with spontaneous magnetizations at room temperature of 49.2 emu/g for MnFe2O4, 23.6 emu/g for coated CHI–MnFe2O4 nanoparticles, 63.2 emu/g for Mn0.5Co0.5Fe2O4 and 33.2 emu/g for coated CHI–Mn0.5Co0.5Fe2O4 nanoparticles. We observed reduction in coercive fields due to coating. Overall, chitosan-coated manganese and manganese-cobalt nanoferrites present as suitable candidates for biomedical applications owing to physicochemical, and magnetic properties exhibited.

Aminodextran Coated CoFe2O4 Nanoparticles for Combined Magnetic Resonance Imaging and Hyperthermia

“…The values obtained are 259 W/g for f = 327 kHz, H = 17 mT and 518 W/g for f = 981 kHz, H = 23 mT. These values are comparable with those reported for iron oxide nanoparticles [44,45]. The high specific absorption rate of the magnetic nanoparticles showed that the prepared nanoparticles have the potential to be used for practical therapy in targeted hyperthermia.…”

Investigating the Structural and Magnetic Properties of Chitosan Coated CoFe2O4 Nanoparticles for Drug Delivery

“…XRD analysis further showed that all NPs were single phased, and no obvious changes were noted after the coating. It has previously been reported that polymer coating do not disrupt the phases [21,6] es [7]. FTIR spectra results confirmed the presence of functional groups in all the samples as seen in (Figure 1&2).…”

“…An interesting peak is represented in the region of 900 cm-1 and is linked to the metal oxide vibrations i.e. Co-Fe and Ca-Fe [7].…”

“…Commonly, iron oxide nanoparticles must be covered by an organic or inorganic biocompatible coating for a variety of reasons [6,7].…”

Surface effects and spin glass state in Co3O4coated MnFe2O4nanoparticles

“…Aslibeiki et al [19] studied the polymer coated MnFe 2 O 4 nanoparticles and reported that the polymer coating enhanced the saturation magnetization, shifted blocking temperature towards the low temperature and changed strong super spin glass behavior to weak superparamagnetic state. Mdlalose et al [20] reported that chitosan coating reduced the M s value of MnFe 2 O 4 nanoparticles and enhanced H c . Therefore coating material can significantly alters the magnetic properties of nanoparticles which mainly depends upon the nature of the coating material.…”