Tuning of magnetic parameters in cobalt-polystyrene nanocomposites by reduction cycling |
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Authors: | Swapna S. Nair Vijutha Sunny |
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Affiliation: | a Departamento de Física and I3N, Universidade de Aveiro, 3810-193, Portugal b Department of Physics, Cochin University of Science and Technology, Cochin 682 022, Kerala, India |
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Abstract: | Cobalt nanoparticles were prepared by a reduction process inside polymer pores using CoSO4·7H2O and NaBH4. A porous polymer network (sulphonated polystyrene) was chosen, as the template for the synthesis of elementary cobalt as high surface area cobalt nanoparticles are prone to oxidation. The preliminary studies reveal that the cobalt is first formed with an oxide protective layer outside and upon repeating the reduction cycles, inner pores of the polymers are opened which enhanced the yield of metallic cobalt. These high surface area cobalt nanoparticles embedded in a polymer are ideal for the synthesis of carbon nanotubes as cobalt can act as a catalyst for the nanotube synthesis. The concentration of cobalt can be tuned in this technique by repeating the cycling process. |
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Keywords: | A. Composites A. Magnetic materials A. Nanostructures B. Chemical synthesis D. Magnetic properties |
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