عنوان مقاله [English]
In this study, manganese ferrite nanoparticles (MnFe2O4)coated with the chitosan (Ch-MnFe2O4) was investigated at the various temperatures. We report the study of synthesis, characteristics of this superparamagnetic agent, which were well prepared in nano-size via the chemical co-precipitation method. TheCh-MnFe2O4 NPs were annealed at the temperatures of 300, 400 and 500ºC. Its structure and morphology and magnetic properties were characterized by the X-ray powder diffraction(XRD) and vibrating sample magnetometer (VSM), respectively.The results have been indicated that the Ch-MnFe2O4 NPs are biocompatible, and have a cubic spinel crystal structure. The average FA-Ch-MnFe2O4 NPs size was dependent to the temperature value and their size as well as magnetization property will be increased while the temperature is increased till 400 ºC, and then with increasing the temperature, they will be decreased. These NPs has exhibited superparamagnetic behavior more at the 400 ºC temperature. Furthermore, the VSM results have been demonstrated that the number of the magnetic momentums will be increased with increasing the size so that theyare used as contrast agents and able to affect the relaxation time through the dipole-dipole interaction being useful in MRI.