Abstract
The nanometric particles possess some physical and chemical properties different from the bulk. The water-based magnetic fluids with nanometric CuxFe1−xOFe2O3 particles were prepared by the two-step method, in which the x value varied from 0.1 to 0.4. The experiment results showed the magnetization decreased with increasing x values. The copper element was partly coprecipitated with iron oxides. These phenomena are ascribed to excess ammonia water in the precipitation. The decanoic acid and the nonanoic acid were selected as the first and second surfactants. The optimal reaction temperatures for the first and second surfactants were 80 and 60 °C respectively with the holding time of 30 min.
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