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FeCl3 (0.08 mol; Wako, Tokyo, Japan) and FeCl2 (0.04 mol; Wako) were dissolved in 50 ml of distilled water. When 50 ml of ammonium hydroxide (25%) were added to this solution with vigorous agitation, magnetite slurry was precipitated. This mixture was then heated to 95¡æ and 55 ml of 10% oleic acid (Wako)/kerosene (Wako) were added. In this process, the magnetite nanocrystals were coated with hydrophilic ammonium oleate, and ammonium oleate began to decompose at 78 ¡æ, with the evaporation of ammonia gas thus changing the magnetite nanocrystals coated with hydrophobic oleic acid upon continuous heating.
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