水基Fe3O4磁流体的制备和磁光特性
来源期刊：中南大学学报(自然科学版)2003年第3期
论文作者：杨华 黄可龙 李卫
文章页码：258 - 261
关键词：磁流体;纳米Fe3O4微粒;磁光现象;机理
Key words：magnetic fluids; nano meter Fe3O4; magneto-optical phenomenon ; mechanism
摘 要：以FeSO4·7H2O(AR),Fe(NO3)3·9H2O(AR),NH3·H2O(AR)为原料,用水热法制备纳米Fe3O4粒子;通过选用合适的分散剂来克服磁性颗粒的沉降,采用超声波分散的方法,制备在重力场和磁场中稳定性好的磁流体.研究了影响水基Fe3O4磁流体性能的主要因素,得到最佳条件: Fe(NO3)3·9H2O和FeSO4·7H2O的量比为1.75,水热反应温度为160℃,反应时间为5 h,1.5 g Fe3O4分散于100 mL水中所需分散剂的用量为0.75 mL.所制备的产物经XRD和粒度仪检测,结果表明:产物为单一相的Fe3O4,水基Fe3O4磁流体体系的粒径在100 nm以下.
Abstract: Taking FeSO4, Fe(NO3)3 and NH3·H2O as the reaction raw material, the nanometer Fe3O4 was successfully prepared by hydrothermal method, and stable water-based Fe3O4magnetic fluid was successfully prepared by adding appropriate surfactant and ultrasonic dispersing.The optimum processing conditions were as follows:n(Fe(NO3)3)/n(FeSO4) is 1.75, reaction temperature is 160℃, reaction time is 6 h, the amount of anion active dispersing agent A to disperse 1.5 g Fe3O4into 100 mL water is 0.75 mL. The product was tested by X-ray and Mastersizer, and the results show that the powder is pure Fe3O4and average particles size is 35 nm. Magneto-optical phenomenon taken on by thick layer of magnetic fluid in different magnetic fields and visible light were observed directly.
