Preparation and Characterization of Dysprosium-neodymium Modified Magnetic Fluid Coated by Agar
(0) The experiment used agar as a coating agent to manufacture dysprosium-neodymium modified water-based magnetic fluid coated by agar with the method of chemical co-precipitation when the two rare-earth element dysprosium and neodymium were precipitated with Fe3+ and Fe2+ together, which has high stability and a strong magnetic field. After the experimental research on all aspects of factors influencing the magnetic fluid, the best conditions were summarized as follows: Under the premises those the mol ratio between Fe and (Nd3++Dy3+) is 29: land it between Fe3+and Fe3+ is 1.70 to 1.75, the mol ratio between Nd3+and Dy3+ should be 1:1; 25%NH3·H2O is the precipitation reagent and the pH value regulator, which is used to control the pH value between 9 and 11; Under the above-mentioned conditions, dysprosium-neodymium modified water-based magnetic fluid is manufactured at the reaction temperature 35 ℃. And then the agar with a high degree of biological affinity is used as a coating agent to coat the above product, under the conditions of the temperature 55℃ and the pH value 2.5, whose best dosage is 0.0100g each 55mL liquid. The dysprosium-neodymium ferrite water-based magnetic fluid manufactured under the best conditions has black color, and its stability and magnetic properties are better than those of the ordinary one. It will appear a bright magnetic halo under the combined effect of the visible light irradiation and the role of magnetic fields. In addition, its characterization was tested in this experiment, such as the situation of surface coating, the stability, the viscosity, the magnetization intensity, etc.
Agar co-precipitation method influencing factors
Yuan Xing-hai Liu Ru Deng Yan-jun
Maying University,Meizhou,Guangdong 514015
国际会议
The 8th China International Nanoscience and Technology Symposium(2009第八届中国国际纳米科技湘潭研讨会Cinsts09)
湖南湘潭
英文
1-4
2009-10-23（万方平台首次上网日期，不代表论文的发表时间）