Re-dispersion Characteristics of Waster-Based Magnetic Fluids Using Oleic Acid and Saturated Fatty Acid <TEX>$(C_9-C_11)$</TEX> System - Preparation and Redispersion Characteristics of Water-Based Magnetic Fluid With the Synthesized Magnetite(3)

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J. Korean Ceram. Soc. > Volume 31(7); 1994 > Article

Journal of the Korean Ceramic Society 1994;31(7): 723.

오레인산-포화지방산$(C_9-C_11)$으로 제조한 수상자성유체의 재분산성 -합성 마그네타이트에 의한 수상자성유체의 제조 및 재분산 특성에 관한 연구(3)

김만, 오재현

연세대학교 금속공학과

Re-dispersion Characteristics of Waster-Based Magnetic Fluids Using Oleic Acid and Saturated Fatty Acid $(C_9-C_11)$ System - Preparation and Redispersion Characteristics of Water-Based Magnetic Fluid With the Synthesized Magnetite(3)

ABSTRACT

Stable aqueous dispersion of magnetite colloid was obtained by allowing a fatty acid, such as nonanoic acid, decanoic acid and undecanoic acid, dissociated with NH4OH solution to adsorb on the monomolecular adsorption of oleate. To obtain a stable dispersion, added amounts of sodium oleate and nonanoic acid for magnetite 20g were more than 2.63$times$10-2 mol and 0.04 mol respectively. In this colloid, good dispersions of magnetite which is sterically stabilized in aqueous system were achieved about pH 7.7. Water-based magnetic fluids using in this study were able to redisperse to water-based magnetic fluids by adding NH4OH solution to dried water-based magnetic fluid powders. Changing a magnetic fluid carrier such as kerosene was also attemped by adding kerosene to dried water-based magnetic fluid powders. In this study, we can obtain a kerosene-based magnetic fluids using drying process.