Abstract
We present here new magnetic liquids: aqueous sols of MnFe2O4 and CoFe2O4 particles. The chemical synthesis of these ionic ferrofluids is performed in two steps:
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— coprecipitation of chemically stable fine grains;
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— ionic stabilization of these grains to get stable colloidal aqueous solutions.
These ferrofluids contain anionic or cationic particles, of typical size ranging from 5 nm to 15 nm, with a volume frafction which can be as large as 25%. Superparamagnetic behavior of liquid solutions allows to characterize particle internal structure. Magnetization measurements on magnetic grains trapped in a gelatin array clearly show the large difference in anisotropy constant of the two ferrites. Strong remanence of CoFe2O4 particles is turned to account, realizing a crystal growth of microscopic needles under magnetic field.
Associated with the Centre National de la Recherche Scientifique.
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© 1989 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG
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Tourinho, F., Franck, R., Massart, R., Perzynski, R. (1989). Synthesis and mangeitc properties of managanese and cobalt ferrite ferrite ferrofluids. In: Bothorel, P., Dufourc, E.J. (eds) Trends in Colloid and Interface Science III. Progress in Colloid & Polymer Science, vol 79. Steinkopff. https://doi.org/10.1007/BFb0116198
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DOI: https://doi.org/10.1007/BFb0116198
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