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Self-assembly and magnetic properties of cobalt nanoparticles
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13.A three-neck flask with 40 ml of dichlorobenzene is heated to ∼220 °C under and stirred for a certain time to exclude ambient air, and then 2.0 mmol of oleic acid and 2.0 mmol of triphenylphosphine are added. In a separate reaction vessel, 2 mmol of is combined with 5 ml of dry dichlorobenzene, warmed briefly to nearly 60 °C under until fully dissolved, and finally rapidly injected into the flask. The solution turns black quickly and foams as decomposes, nucleating Co NPs and releasing CO gas. After the CO gas disappears, the black solution is refluxed at 185 °C for 20 min. Then the black solution is cooled to room temperature. Particles are precipitated by adding ethanol to the dispersion. Cobalt nanoparticles with 7-nm average diameter are obtained by the gentle destabilization/redispersion procedure with a size distribution of σ∼5%. When increasing the concentration of the oleic acid and triphenylphosphine by a factor of 2, cobalt NPs of about 5 nm can be yielded.
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