自形成法γ-Fe_2O_3磁性液体的制备及磁性  

The Preparation of Self-Formed γ-Fe_2O_3 Ferrofluide and Its Magnetism

作　　者：高荣礼[1] 李建[1] 韩芍娜[1] 李强[1] 陈娴敏[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）》2008年第5期1-7,共7页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市自然科学基金资助课题(CSTC2007BA3031);西南师范大学发展基金资助课题(SWNUF2004005)

摘　　要：介绍了自形成法γ-Fe2O3磁性液体的制备方法,用X射线衍射仪(XRD)和透射电子显微镜(TEM)对微粒进行了表征,并用振动样品磁强计(VSM)对γ-Fe2O3粉末及水基γ-Fe2O3离子型磁性液体进行了测量.结果表明:γ-Fe2O3粉末及其磁性液体呈超顺磁性,在室温下无矫顽力和剩磁;磁性液体的比饱和磁化强度与磁性液体中微粒的体积分数以及基液的磁性有关;在磁性液体的合成中,强磁性的γ-Fe2O3微粒可能形成磁矩闭合连接成环状结构,以致磁性液体的比饱和磁化强度的实验值小于计算值.The preparation of self-formed γ-Fe2O3 ferrofluids is introduced in this paper, and the particle of γ-Fe2O3 is described by X-ray diffraction（XRD） and transmission electron microscope（TEM）. The γ-Fe2O3 powder and its ion-ferrofluids are measured and analyzed by a vibrating sample magnetometer （VSM）. The results show that the γ-Fe2O3 and its ferrofluids are superparamagnetic, and that no coercivity and rerhanence are observed at room temperature. The specific saturation magnetization of the ferrofluids is related to the volume fraction of the particles in the ferrofluids. In the process of ferrofluid synthesis,the ferromagnetic γ-Fe2O3particles may link into closed-ring strcutures so that the value of the specific saturation magnetization measurement is less than that of calculation in ferrofluids.

关 键 词：自形成法 磁性液体 饱和磁化强度 

分 类 号：O482.54[一般工业技术—材料科学与工程]