ZnFe_2O_4基磁凝胶的制备及磁性

Preparation and Magnetization Behavior of a Magnetic Gel Based on ZnFe_2O_4

用自形成法制备ZnFe2O4磁凝胶,并进一步研究包裹ZnFe2O4的γ-Fe2O3磁凝胶的制备,用振动样品磁强计(VSM)对ZnFe2O4和包裹ZnFe2O4的-γFe2O3磁性微粒及配制的胶体处在溶胶和凝胶的磁性测量.结果表明ZnFe2O4磁性微粒和胶体呈顺磁性,而包裹ZnFe2O4的-γFe2O3磁性微粒和胶体呈亚铁磁性.ZnFe2O4凝胶较其溶胶易磁化,而ZnFe2O4/γ-Fe2O3凝胶较其溶胶难磁化.从微观机制上解释了产生这些磁性差异的原因.

ZnFe2O4 magnetic gel is prepared by the self-formed method, and the preparation of T-Fe2 O3 coated with ZnFe2O4 is studied. The magnetization of ZnFe2O4 and y-Fe2O3 nanoparticles coated with Zn- Fe2O4 and their gels and sols are measured by a vibrating sample magnetometer（VSM）. The results show that the ZnFe2O4 powder and its colloid are paramagnetic, while the T-Fez O3 magnetic particles coated with ZnFe2O4 and colloid show ferrimagnetism. ZnFe2O4gel is easier to be magnetized than sol. However, ZnFez O4/y-FezO3 gel is harder magnetized than sol. The reason for the difference in magnetization is interpreted microscopically.