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Abstract
Magnetic oxide powders (BaFe 12O 19, SrFe 12O 19, Fe 3O 4 and γ-Fe 2O 3) were dispersed in 36 liquid systems, and their particle packing by sedimentation investigated. Sedimentation volume mesurements showed dispersibility to be highly dependent on the liquid's polarity: nonpolar liquids such as n-hexane, benzene and cyclohexane are not suited for dense particle packing, while polar organic liquids, especially alcohols and carboxylic acids, are good dispersion media, aiding particle packing. Sediment density was doubled by agitating suspension ultrasonically, as particle agglomerates were effectively broken up by the action of ultrasonic cavitation. Application of a weak magnetic field to suspensions did not improve sediment density, but formed loose microstructures characterized by closed loops of crystallites.
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