| Ferrite has been widely used in many fields,such as industry,electronics,medical,communication,biological engineering and so on because of its excellent electromagnetic properties.Ferrite is nontoxic and biocompatible,and it is expected to be used in the study of tumor magnetic therapy.It has broad application prospects in the field of medicine.The properties of ferrite are closely related to the morphology,particle size and dispersion of the nanoparticles.Therefore,it is of special significance to prepare nano ferrite with controllable morphology,uniform size and stable performance.In this paper,monodisperse nano MnZn Ferrites were synthesized by solvothermal,nickel zinc ferrite and cobalt ferrite,and the effects of different reaction conditions on the dispersion of nano ferrite grain size,influence of morphology and properties,the main research contents are as follows:(1)Using ferric chloride and zinc chloride as precursor,ethylene glycol as solvent,monodisperse nano ferrite was synthesized by solvothermal method.The effects of surfactant dosage,drug dosage and reaction temperature on the morphology of the product,particle size and dispersion effect and through X diffraction(XRD),scanning electron microscopy(SEM),vibrating sample magnetometer(VSM)structure,and an alternating magnetic field generator on the morphology of the product,and the magnetic magnetic properties were characterized and studied.Through the study on the optimum conditions for: adding 0.8mmol polyethylene glycol 5mmol,ferric chloride,reaction temperature is 180 deg c,20 mmol ammonium acetate.Under the optimum conditions of nano ferrite are monodisperse,crystallinity and good performance.And exhibits a ferrimagnetic at 5-25 deg.c.(2)Under the optimum conditions of Mn Zn ferrite nano MnxZn1-xFe2O4 ferrite prepared monodisperse(x=0.2,0.4,0.6,0.8)and by X diffraction(XRD),scanning electron microscopy(SEM),vibrating sample magnetometer(VSM)and Magnetocaloric Properties and other means were used to characterize the samples.XRD analysis results showed that the Mn Zn ferrite preparation is cubic spinel structure,high purity,good crystallinity,with the increase of x value,nickel zinc ferrite lattice constant gradually decreases.The analysis results show that the magnetic properties of MnZn ferrite showed ferrimagnetic at 5-25 deg.c,which can change the value of manganese and zinc,to change the product of magnetic properties and Magnetocaloric Properties.(3)The monodisperse nano NixZn1-xFe2O4 ferrite(x=0.2,0.4,0.6,0.8)was prepared,and the effects of different molar ratios on the magnetic properties and magnetic properties of the products were investigated.According to the research,the products show the properties of the magnetic properties in the 5-25 deg.c.With the increase of x value,the saturation magnetization increases first and then decreases.In x=0.2,the maximum value is reached maximal value and the area of the hysteresis loop is larger.The magnetic energy of the sample is consistent with the change of the magnetic thermal effect.The Ni0.6Zn0.4Fe2O4 ferrite showed good magnetic thermal performance,and the response to 600 s in the 50 kHz alternating magnetic field,and the final temperature reached 63.6 degrees Celsiu.(4)Nano ferrite was prepared by CoxZn1-xFe2O4(x=0.1,0.3,0.5,0.7),SEM results show that the product has good dispersion and uniform size.XRD results show that the obtained product is cubic spinel structure,the lattice constant of the product decreases with the increase of x value.When x=0.1,0.3,0.5 and 0.7,the corresponding lattice constants are 0.8434 nm,0.8426 nm,0.8418 nm,0.8410 nm and,respectively.Under the conditions of 5-25,the products show the magnetic properties of the iron,and the magnetic properties increase with the increase of the content of cobalt.The magnetic heat effect of the product under the external alternating magnetic field is very significant,Co0.3Zn0.7Fe2O4 in the 50 kHz alternating magnetic field in response to 600 s,and the final temperature can reach 101.8 degrees Celsius. |
PDF Full Text Request