一种γ-Fe_2O_3磁性液体的合成及其磁化性质研究  

The Synthesis of aγ-Fe_2O_3 Ferrofluid and a Study of Its Magnetization Behavior

作　　者：李军明[1] 李建[1] 陈龙龙[1] 龚小敏[1] 

机构地区：[1]西南大学物理科学与技术学院,重庆400715

出　　处：《西南大学学报（自然科学版）》2014年第5期84-90,共7页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11074205)

摘　　要：采用共沉淀-化学诱导相变法制备了γ-Fe2O3磁性纳米微粒,并用Massart法合成了聚乙烯醇（PVA）体积分数为0~1%的水基γ-Fe2O3离子型磁性液体.利用振动样品磁强计（VSM）对磁性液体的磁化性质进行了研究,结果表明：微粒体积分数相同的γ-Fe2O3磁性液体,由于基液中PVA体积分数不同,饱和磁化强度也不同;纯水基的约化饱和磁化强度与纳米微粒的饱和磁化强度基本相同;含PVA的磁性液体其饱和磁化强度较纯水基磁性液体的饱和磁化强度小,且随着PVA体积分数的增大而更为显著.γ-Fe2O3 magnetic nanoparticles were prepared by the method of co-precipitation-chemically induced phase transition,and water-basedγ-Fe2O3ionic ferrofluids whose PVA（polyvinyl alcohol）volume fraction was 0-1% were synthesized with the Massart method.The magnetization behaviors of both the particles and the ferrofluids were measured with a vibrating sample magnetometer（VSM）.The experimental results showed that for theγ-Fe2O3ferrofluids having the same particle volume fraction,their saturation magnetizations were different because of the differences of the volume fraction of PVA in the carrier liquid,and for the pure water-based ferrofluid（i.e.PVA=0in the carrier liquid）,its reduced saturation magnetization was similar to the saturation magnetization of the nanoparticles.The saturation magnetization of the PVA-based ferrofluids was smaller than that of the pure water-based ferrofluid and decreased with increasing content of PVA in the carrier liquid.

关 键 词：磁性纳米微粒 磁性液体 聚乙烯醇 磁化性质 

分 类 号：O469[理学—凝聚态物理]