超顺磁纳米四氧化三铁的制备方法

Preparation of superparamagnetic Fe_(3)O_(4)nanoparticles

将FeSO_(4)·(NH 4)_(2)SO_(4)·6H_(2)O及FeCl_(3)·6H_(2)O水溶液加入反应器中,在氩气保护下,搅拌下,缓慢滴入水合肼溶液,反应完毕后,经离心、洗涤、干燥后,得到前驱体。将前驱体加入水热釜中,加入氨水,在200℃反应24 h,经冷却、离心、洗涤、干燥后,得到最终产物。对前驱体进行了SEM、XRD分析,对最终产物进行了SEM、XRD、FIIR表征及磁性能分析。结果表明,前驱体具有片状结构,为两种晶型FeO(OH)混合物;最终产物为球形,大小均一的Fe_(3)O_(4)颗粒(粒径40~50 nm),XRD标准卡号:03-065-3107,具有超顺磁特性,饱和磁化强度达到74.66 emu/g。

The aqueous solution of FeSO_(4)·(NH 4)_(2)SO_(4)·6H_(2)O and FeCl_(3)·6H_(2)O were added into the reaction flask.Under the protection of argon,the hydrazine hydrate solution was dropped slowly into the flask with stirring.After the reaction,the precursor was obtained after centrifugation,washing and drying.The precursor and ammonia solution were added to the hydrothermal reactor,and then the reactor was heated at 200℃for 24 h.After reaction,the final product was obtained after cooling,centrifugation,washing and drying.The precursor was characterized by SEM and XRD,and the final product was characterized by SEM,XRD,FIIR and magnetic properties.The results show that the precursor is a mixture of two crystal types of FeO(OH)with a flaky morphology.The final product is spherical Fe_(3)O_(4)particles(XRD card number:03-065-3107;size:40~50 nm),and has excellent superparamagnetism.The saturation magnetization of Fe_(3)O_(4)synthesized reaches 74.66 emu/g.