水基Fe_3O_4离子型磁性液体的制备与磁性  

The Preparation and Magnetic Properties of Aqueous Fe_3O_4 Ionic Ferrofluid

作　　者：王安蓉[1] 李建[1] 白浪[1] 

机构地区：[1]西南大学物理科学与技术学院

出　　处：《西南师范大学学报（自然科学版）》2006年第5期93-97,共5页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：重庆市自然科学基金资助项目(CSTC;2005BB4106);西南师范大学发展基金资助项目(SWNUF2004005).

摘　　要：用振动样品磁强计(VSM)对采用Massart法制备的水基Fe3O4离子型磁性液体的磁性进行了测量和分析,其结果表明磁性液体的饱和磁化强度与磁性液体中微粒的体积分数、磁性微粒在基液中形成的非磁性层、以及基液的磁性有关,而矫顽力Hc和剩余磁化强度与饱和磁化强度的比值Mr/Ms都与磁性液体中微粒的体积分数无关,高浓度磁性液体饱和磁化强度的特征与微粒饱和磁化强度的特征相似,低浓度磁性液体受基液影响在高场下表现出明显的抗磁性.Aqueous Fe3O4 ionic ferrofluid, which is prepared by Massart＇s method, is measured and analyzed by vibrating samples magnetometer（VSM）. The results show that the saturation magnetization of Fe3O4 ferrofluids is in relation to the volume fraction particles in ferrofluids, the non-magnetism layer of nanoparticles and the magnetic properties of carrier liquid. The coercive force of ferrofluids and the ratio between remanence and saturation magnetization are independend of the volume fraction of the particles in ferrofluids. The saturation magnetization of the high concentration ferrofluids is similar with nanoparticles. The low concentration ferrofluids is influenced by carrier liquid under high field so that anti-magnetion exhibts.

关 键 词：离子型磁性液体 体积分数 磁化特性 

分 类 号：O414[理学—理论物理]