Abstract
Fe 3 O 4 , magnentic colloids were produced by co-precipitating a Fe 2+ , Fe 3+ , and Zn 2+ containing solution with a NaOH solution at 70°C. Analyses results indicated that the Zn content of the Fe 3 O 4 , colloids was always less than the solution's Zn content. The difference was found to be the smallest when the colloid was precipitated at pH=10. The σs values of the Fe 3 O 4 , colloid significantly improved by adding an appropriate amount of Zn ions and precipitaing it at an optimum pH value, pH=10. The optimum Zn ion content was 6.18 at%, which was corresponded to Zn 0-1854 Fe 0-1845 Fe 2 0 4 . At this composition the colloid's σ s value was 94 emu/g, and increased by more than 34% of pure Fe 3 O 4 , colloid's σ value. By theoretical calculation the σ s should increase 27.8%.
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