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Magnetically loaded poly(methyl methacrylate-co-acrylic acid) nano-particles

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An Erratum to this article was published on 13 April 2006

An Erratum to this article was published on 13 April 2006

Abstract

Magnetically loaded polymeric nano-particles carrying functional groups on their surface were prepared by a two-stage process. In the first stage, super-paramagnetic magnetite (Fe3O4) nano-particles were produced by a co-precipitation method from the aqueous solutions of FeCl2·4H2O and FeCl3·6H2O using a NaOH solution. The smallest size obtained was 40.9 nm with poly-dispersity index of 0.194 obtained by using a Zeta Sizer. The effects of Fe2+/Fe3+ molar ratio, stirring rate, temperature, base concentration, and pH on the particle size/size distribution and stability of the dispersions were examined. Increasing the relative concentration of Fe2+ ion and decreasing the stirring rate and pH increased the particle size, while the concentration of NaOH and temperature did not change the particle size significantly. Polymer coating was achieved by emulsion polymerization at high surfactant to monomer ratio of methyl methacrylate (MMA) and acrylic acid which were used as comonomers (comonomer ratio: 90/10 weight) with high surfactant to monomer ratio. The surfactant and initiator were SDS and KPS, respectively. Nano-particles in the range of 115 and 300 nm in diameter were produced depending on recipe. Increasing the Fe3O4/monomer and surfactant/monomer ratios, the KPS concentration caused a decrease in the average diameter. Magnetic properties of the nano-particles were obtained by electron spin resonance and vibrating-sample magnetometer. Most of the polymer-coated nano-particles exhibited super paramagnetic behavior.

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Acknowledgement

Prof. Erhan Piskin was supported by Turkish Academy of Sciences as a full member.

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Authors and Affiliations

  1. Department of Chemical Engineering and TÜBİTAK-Biyomedtek Center for Biomedical Technologies Beytepe, Hacettepe University, 06800, Ankara, Turkey

    F. Sayar, G. Güven & E. Pişkin

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  1. F. Sayar
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  2. G. Güven
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  3. E. Pişkin
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Correspondence to E. Pişkin.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00396-005-1426-y

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Sayar, F., Güven, G. & Pişkin, E. Magnetically loaded poly(methyl methacrylate-co-acrylic acid) nano-particles. Colloid Polym Sci 284, 965–978 (2006). https://doi.org/10.1007/s00396-005-1383-5

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