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Magnetic CoFe2O4 Microspheres with Tunable Size Synthesized Through Aggregation of Nanoparticles

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A solvothermal approach was used for synthesizing magnetic CoFe2O4 microspheres by aggregating nanoparticles. CoFe2O4 nanoparticles, microspheres, porous and hollow spheres were formed by changing experiment parameters, such as reaction time and the amounts of NaAc and poly(vinyl pyrrolidone) (PVP). The aggregation degree of nanoparticles was controlled using PVP via a steric effect. The results show that the aggregated nanoparticles are loosely compacted due to the steric effect of PVP molecules. NaAC amount was crucial for the structure and size of resulting samples. Time-dependent experiments were carried out to research the formation process of microspheres. The possible mechanisms for the formation and size control of the microspheres obtained with and without PVP are proposed. Predominant magnetic properties make these mocrospheres easy to control in an external magnetic field and broaden their applications.
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Keywords: AGGREGATION; FORMATION MECHANISMS; MICROSPHERES

Document Type: Short Communication

Publication date: April 1, 2015

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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