Agglomeration from matter in the molecular state, rather than long- term grinding and dispersion techniques, was used to prepare magnetic colloids. Under optimum conditions, freshly precipitated iron (II and III) hydrous oxides in an aqueous phase can be extracted into an immiscible hydrocarbon phase by means of a transfer agent. Steric stabilization of the colloidal magnetic particles was accomplished by a suitable peptizing agent which also acted as a dispersing agent. Rapid preparation of large volumes of magnetic fluids at a substantial saving in cost was accomplished at the Bureau of Mines by the peptization technique.
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