발간논문

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Vol.32, No.4, 425 ~ 433, 1994
Title
Preparation and Re - Dispersion Characteristics of Water - based Magnetic Fluids using Oleic Acid -lauric Acid System - Preparation and re - dispersion characteristics of water - based magnetic fluid with synthesized magnetite (1) -
오재현Jae Hyun Oh, 김성완Seung Wan Kim, 김만Mahn Kim, 강남기Nam Kee Kang
Abstract
The water-based magnetic fluids were prepared with the synthesized ultrafine magnetite using sodium oleate and lauric acid as surfactants. The dispersion ratio of water-based magnetic fluids was maintained constantly when the added amounts of sodium oleate and lauric acid for magnetite(20g) were more them 1.6×10^(-2)㏖, 3.0×10^(-2)㏖ respectively. The stable pH region for the magnetic fluids prepared with sodium oleate and lauric acid was range of pH 8.0 to pH 10.0. As the solid content increased from 0.05 g/cc to 0.5g/cc, the viscosity of water-based magnetic fluids increased from 0.97 cp to 12.08 cp, and its saturation magnetization at 5kOe increased from 3.1 emu/g to 20.6 emu/g. Water-based magnetic fluids were able to redisperse to kerosene-based or water-based magnetic fluids by adding kerosene and NH₄OH solution to dried water-based magnetic fluids. However in the case of redispersed water-based magnetic fluids, the saturation magnetization decreased with increasing iteration.
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