Abstract

The dispersion of fine magnetic powders synthesized from metal alkoxides was studied. The powders were treated with an alkali, and then oleic ions were adsorped in sodium oleate aqueous solution. This as-wetted powders were dispersed in water or alkylnaphthalene containing a surfactant. It is concluded that;(1) Fine particles below 10-15nm are required to prepare stable suspensions, (2) To be fully adsorped with oleic ions, the powder synthesized have to be treated with an alkali, (3) The surfactant more than 25wt% of the powder is repuired to disperse the powder, (4) The effective surfactant is sodium oleate for water suspension medium and ethoxylated alcohol phosphate for alkylnaphthalene suspension medium.

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