Synthetic of Magnetic Fine Powder for Oil Suspending Magnetic Fluid

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J. Korean Ceram. Soc. > Volume 28(2); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(2): 146.

자성 유체용 미분 자성 분체의 제조

이경희, 이병하, 이재영

명지대학교 공과대학 무기재료공학과

Synthetic of Magnetic Fine Powder for Oil Suspending Magnetic Fluid

ABSTRACT

Ultra fine and homogeneous (Ni0.4Zn0.6)Fe2O4 ferrite powders were prepared by direct-wet, Hydrothermal and coprecipitation methods. In case that specific surface areas of Ni-Zn ferrite powders were over 220㎡/g, 100㎡/g, 30㎡/g individually direct-wet, hydrothermal and coprecipitation methods. The Ni-Zn ferrite magnetic fluids of which Solvents were benzene or kerosene was prepared by making cation surfactant adsorbed on the surface of the (Ni0.4Zn0.6)Fe2O4. The results that measured dispersion and viscosity by making cation surfactant adsorbed were as follows. 1. The adsorption amount of Oleric acid be proportioned the specific surface area of powders. 2. The maximum amount of Oleric acid was 36wt% of dried powders which has 220㎡/g of specific surface area. 3. The stability of fluid by direct-wet synthesis emthod in benzene or kerosene solvent excellent.