Preparation and Dispersion Characteristics of Oil-based Magnetic Fluids with Synthesized Magnetite

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J. Korean Ceram. Soc. > Volume 33(8); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(8): 901.

합성마그네타이트를 이용한 유상자성유체의 제조 및 분산특성

조명호, 김만¹, 민동준, 오재현

연세대학교 금속공학과
¹(주)고합 신소재팀

Preparation and Dispersion Characteristics of Oil-based Magnetic Fluids with Synthesized Magnetite

ABSTRACT

The oil-based magnetic fluids were prepared with synthesized ultrafine magnette by allowing surfactactants such as sodium oleate and aliquat 336 to adsorb on the surface of magnetite particles. The dispersion ratio of oil-based magnetic fluids was higher than 90% when the amount of sodium oleate and aliqua 336 were more than 2.63$times$10-2 mol and 6.56$times$10-3 mol for 20g of magnetite respectively. The dispersion ratio of oil-based magnetic fluids with the amount of secondary surfactant addition was higher than 90% when oil-based magnetic fluids were prepared with aliquat 336 of cationic type. However oil-based magnetic fluids prepared with surfactants of anionic and nonionic type showed lower dispersion than whose with cationic surfac-tants.

Key words: Magnetic fluid, Ferro-fluid, Magnetite, Dispersion, Colloid