Dispersion Characteristics Water-Based Magnetic Fluids Using Oleic Acid - Preparation and Re-Dispersion Characteristics of Water-Based Magnetic Fluid with Synthesized Magnetite(2)

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J. Korean Ceram. Soc. > Volume 31(3); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(3): 298.

오레인산에 의한 수상자성유체의 분산특성 - 합성마그네타이트에 의한 수상자성유체의 제고 및 재분산특성에 관한 연구(2)

오재현, 김삼일¹, 김만, 이홍림¹

연세대학교 금속공학과
¹연세대학교 세라믹공학과

Dispersion Characteristics Water-Based Magnetic Fluids Using Oleic Acid - Preparation and Re-Dispersion Characteristics of Water-Based Magnetic Fluid with Synthesized Magnetite(2)

ABSTRACT

Water-based magnetic fluids were made of the synthesized ultrafine magnetite with surfactants such as sodium oleate and loeic acid. The water-based magnetic fluid was prepared under the condition that added amounts of sodium oleate and oleic acid dissolved with NH4OH were 2.64$times$10-2 mol, 1.5~2.0$times$10-2 mol respectively. The water-based magnetic fluid was stable and should be dispersed well dispersion in the range of pH 9.0 to pH 11.0. As the solid content increased from 0.05 g/cc to 0.4 g/cc, the viscosity of water-based magnetic fluids increased from 2.5 cP to 152 cP and their magnetization at 5 KOe linearly increased from 3.1 emu/g to 26 emu/g. The aggregated powder after drying the water-based magnetic fluid was also successfully re-dispersed in dilute NH4OH solution and in kerosene.