Papers by Keyword: Nano-Magnetic Fluid

Abstract: In order to analyze the influences of process condition on kerosene-based Fe₃O₄, which are prepared in chemical co-precipitation, orthogonal experiment was used. How process condition influenced the size of nano-particles and saturation magnetization was studied, and the best process condition as 40ml•min^-1 NaOH adding speed, 10ml•min^-1 sodium oleate adding speed, 45°C reaction temperature, 15min holding time and pH value of 2 of coating sodium oleate was obtained. The performance of magnetic particles was characterized by transmission electron microscopy (TEM) and WSM vibration magnetometer. The diameter of Fe₃O₄ nano-particles was less than 10nm, saturation magnetization was 2.66×10⁴A•m^-1, viscosity of nano-magnetic fluid was 18mPa•s, and density was 1.13×10³kg•m^-3. This research enhanced the foundation of using nano-magnetic fluid.

Abstract: Water-based Fe3O4 nano-magnetic fluid for seal was prepared by coprecipitation. In order to obtain nano-magnetic fluid preparation technology which can produce industrially, the choice of second coating surfactant has been studied. Factors affecting nano-particle size and particle saturation magnetization were investigated using five factors and three level orthogonal experimental design. The size of nano-particles and particle saturation magnetization were characterized by transmission electron microscopy (TEM) and WSM vibration magnetometer. The results showed that the adding speed of NaOH solution and heat-maintaining time after adding, adding speed and reaction temperature of sodium oleate solution, as well as the heating temperature of sodium oleate solution influence the properties of nano-magnetic particles more. With the optimum process parameters, Fe3O4 nano-magnetic fluid which is below 15nm and can meet the nano-magnetic fluid sealing technology requirements has been prepared.