Biocompatible and biodegradable polymer nanofibers displaying superparamagnetic properties. |
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Authors: | Song Ting Tan Joachim H Wendorff Clemens Pietzonka Zhi Hong Jia Gui Qing Wang |
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Institution: | Institute of Polymer Materials, Xiangtan University, Xiangtan 411105, P. R. China. tanst2008@163.com |
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Abstract: | Superparamagnetic polymer nanofibers intended for drug delivery and therapy are considered here. Magnetite (Fe3O4) nanoparticles in the diameter range of 5-10 nm were synthesized in aqueous solution. Polymer nanofibers containing magnetite nanoparticles were prepared from commercially available poly(hydroxyethyl methacrylate), PHEMA, and poly-L-lactide (PLLA) by the electrospinning technique. Nanofibers with diameters ranging from 50 to 300 nm were obtained. Nanofibers containing up to 35 wt % magnetite nanoparticles displayed superparamagnetism at room temperature. The blocking temperature was about 50 K for an applied field of 500 Oe, and the saturation magnetization was 3.5 emu g(-1) and 1.1 emu g(-1) for Fe3O4/PHEMA and Fe3O4/PLLA nanofibers, respectively, and depended on the amount of Fe3O4 nanoparticles in the nanocomposites. To test such magnetic nano-objects for applications as drug carriers and drug-release systems we incorporated a fluorescent albumin with dog fluorescein isothiocyanate (ADFI). |
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Keywords: | drug delivery electrospinning fluorescence magnetic properties nanostructures |
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