Synthesis and properties of magnetite nanoparticles with peroxide-containing polymer shell and nanocomposites based on them |
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Authors: | Vitalii Serdiuk Oleh Shevchuk Natalya Bukartyk Tetiana Kovalenko Anatolii Borysiuk Viktor Tokarev |
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Affiliation: | 1. Mayo Clinic, Orthopedic Surgery, Rochester, Minnesota, USA;2. Department of Organic Chemistry, Lviv Polytechnic National University, Institute of Chemistry and Chemical Technologies, Lviv, Ukraine;3. Department of Heat Engineering and Thermal and Nuclear Power Plants, Lviv Polytechnic National University, Institute of Power Engineering and Control Systems, Lviv, Ukraine;4. Department of Applied Physics and Nanomaterials Science, Lviv Polytechnic National University, Institute of Applied Mathematics and Fundamental Sciences, Lviv, Ukraine |
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Abstract: | Magnetite nanoparticles (Fe3O4 NPs) with peroxide-containing polymer shell have been synthesized using the method of coprecipitation from the mixture solutions of Fe (II) and Fe (III) salts in the presence of peroxide-containing copolymer (PCC). Polymer shell presence has been proved by elemental and complex thermal analysis. Synthesized Fe3O4 NPs possess superparamagnetic properties. Their specific saturation magnetization decreases gradually from 65 to 54 A·m2·kg−1 with increasing PCC concentration owing to the surface spin pinning effect caused by a polymer shell. The average sizes of Fe3O4 NPs estimated from the data of XRD analysis and magnetic measurements are in the range of 9–12 nm. The NP sizes determined by the DLS method lie in the range of 150–270 nm; this result is significantly larger than the sizes estimated by the two aforementioned methods evidencing a tendency for Fe3O4 NPs toward self-association. Cross-linked composite films based on polyvinyl alcohol have been obtained via radical curing initiated by the PCC shell of nanoparticles. The resulting composite films are magnetically sensitive films with rather high physico-mechanical properties (tensile strength reaches 48–67 MPa and relative elongation – 4%–21% depending on cross-linking degree), a priori non-toxic and biocompatible, which makes them promising materials for various applications. |
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Keywords: | copolymers nanoparticles, nanowires and nanocrystals synthesis and processing techniques |
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