Hydrochloric Acid → Oleic Acid

Participants

Reaction Conditions

Reaction Steps

The fine magnetic particles are prepared by dissolving 0.1 mol of manganese sulfate, 0.4 mol of zinc sulfate and 0.5 mol of ferric sulfate in one liter of water, adding dropwise 6N sodium hydroxide to the aqueous solution while maintaining the temperature at 90° C. with stirring to reach a pH 11, whereby a colloid of Mn-Zn ferrite is formed. The liquid temperature is adjusted to 80° C., and 250 ml of a 10% sodium oleate solution is added to the mixture with stirring. After cooling the mixture to room temperature, aqueous 3N hydrochloric acid solution is added until a pH 6 is reached. Coagulated colloid particles are washed with water sufficiently and dried, thereby obtaining fine Mn-Zn ferrite particles coated with oleic acid.

Provenance & Evidence