Abstract
By controlling the growth kinetics of nanoparticles, octahedral magnetite nanoparticles were successfully synthesized employing an oxidation–precipitation method with FeSO 4·7H 2O, NaNO 3 and NaOH as starting materials. Magnetite nanoparticles with 40 nm or less can be synthesized under the following conditions: pH 9.5, F = 10–90 ml/min, T = 60–90 °C, C = 0.2–1 mol/l, t = 4 h, R = 200–500 rpm. The saturation magnetizations of octahedral magnetite nanoparticles are in the range from 80 emu/g to 90 emu/g. The remanence magnetizations of the as-prepared samples are lower than that of the bulk magnetite and the coercive forces of the as-prepared sample are around 140 Oe.
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