Magnetic behavior of core–shell particles |
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| Authors: | Chun-Rong Lin Cheng-Chien Wang I-Han Chen |
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| Institution: | 1. Department of Mechanical Engineering, Southern Taiwan University of Technology, Tainan County 710, Taiwan, ROC;2. Department of Chemical Engineering and Material Engineering, Southern Taiwan University of Technology, Tainan County 710, Taiwan, ROC |
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| Abstract: | We have prepared composite magnetic core–shell particles using the process of soap-free emulsion polymerization and the co-precipitation method. The shell of the synthesized composite sphere is cobalt ferrite (CoFe2O4) nanoparticles and the core consists of poly(styrene-co-methacrylic acid) polymer. The mean crystallite sizes of the coated CoFe2O4 nanoparticles were controlled in the range of 2.4–6.7 nm by the concentration of NH4+] and heated temperature. The magnetic properties of the core–shell spherical particles can go from superparamagnetic to ferromagnetic behavior depending on the crystalline sizes of CoFe2O4. |
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| Keywords: | 75 20 &minus g 75 50 Tt 75 75 +a |
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