ZnFe2O4基磁凝胶的制备及磁性
Preparation and Magnetization Behavior of a Magnetic Gel Based on ZnFe2O4
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摘要: 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γ-Fe2O3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γ-Fe2O3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.
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关键词:
- 凝胶,溶胶,顺磁,铁磁,磁化强度
Abstract: ZnFe2O4 magnetic gel is prepared by the self-formed method, and the preparation of γ-Fe2O3 coated with ZnFe2O4 is studied. The magnetization of ZnFe2O4 and γ-Fe2O3 nanoparticles coated with ZnFe2O4 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 γ-Fe2O3 magnetic particles coated with ZnFe2O4 and colloid show ferrimagnetism. ZnFe2O4 gel is easier to be magnetized than sol. However, ZnFe2O4/γ-Fe2O3 gel is harder magnetized than sol. The reason for the difference in magnetization is interpreted microscopically. -
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