CAJ | 학술논문

该文首次报道了用W/O微乳液法制备不同镝(Dy3+)含量的水基镝铁氧体磁流体，得到制备镝铁氧体磁流体的合适条件，所得磁流体的磁性强且稳定性好。根据Langevin函数，证实了制备的磁流体在167K以上具有超顺磁性，其闭锁温度在107～167K之间。IR谱表明磁粒子是被聚乙二醇辛基苯基醚(表面活性剂)所包裹的稀土镝铁氧体；从XRD谱证实其为含有稀土镝的四氧化三铁晶体；TEM照片显示其形貌为被表面活性剂包裹的立方体，粒子的平均粒径为18nm。
해문수차보도료용W/O미유액법제비불동적(Dy3+)함량적수기적철양체자류체，득도제비적철양체자류체적합괄조건，소득자류체적자성강차은정성호。근거Langevin함수，증실료제비적자류체재167K이상구유초순자성，기폐쇄온도재107～167K지간。IR보표명자입자시피취을이순신기분기미(표면활성제)소포과적희토적철양체；종XRD보증실기위함유희토적적사양화삼철정체；TEM조편현시기형모위피표면활성제포과적립방체，입자적평균립경위18nm。
This paper reports unprecedented preparation of the ferrofluidswhich is based-water ferrites of different content of Dy3+ by using water-in-oil(W/O) microemulsion. Conditions of preparation were investigated, the optimum conditions of preparation are strong magnetism and good stability when the age temperature is at 80℃ and the age time is about 6 h ours and content of dysprosium is 1.0ml. Inn term of Langevin function, the ferr ites have superparamagnetism when the temperature is above 167K, and the blockin g temperature is between 107K and 167K. Otherwise, the ferrites were characteriz ed by using IR, XRD, and TEM. IR confirmed that the particles are ferrites packe d by P-Octyl polyethylene glycol phonylether. The average particle size is 18nm .