The Preparation and Characteristics of the Dysprosium-neodymium Magnetic Liquid

In this study,We used the chemical co-precipitation method to prepare water-based dysprosium-neodymium ferrite magnetic with higher saturation intensity.The effect on stability of temperature,the amount of dysprosium and neodymium,the amount of surfactant added,the pH were studied.The result showed that:(1) the n(Fe):[n(Nd3+)+n(Dy3+)]=14:1,n(Fe3+):n(Fe2+)=1.70～1.75,the ratio of dysprosium and neodymium is n(Nd3+):n(Dy3+)=1:1,25%NH3·H2O(A.R.) as precipitating agent and pH value conditioner,the reacting system temperature was controlled in 35℃,pH= 9～11 are the optimal condition;(2)the optimal concentration of gelatin is 0.08g/L,the temperature was controlled in 55 ℃ and pH= 4.The magnetism of dysprosium-neodymium ferrite magnetic fluid is higher than common water-base magnetic fluid.It has shined the bright light-ring of magnetism shine,under visible light and acts on magnetic field together.In addition,the characteristics of viscosity,saturation magnetization,surface of the coating and the stability were tested.