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Synthesis and properties of magnetite nanoparticles with peroxide‐containing polymer shell and nanocomposites based on them

2021; Wiley; Volume: 138; Issue: 36 Linguagem: Inglês

10.1002/app.50928

1097-4628

Vitalii Serdiuk, Oleh Shevchuk, Natalya Bukartyk, Tetiana Kovalenko, Anatoliy Borysiuk, Viktor Tokarev,

Magnetic Properties and Synthesis of Ferrites

Abstract Magnetite nanoparticles (Fe 3 O 4 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 Fe 3 O 4 NPs possess superparamagnetic properties. Their specific saturation magnetization decreases gradually from 65 to 54 A·m 2 ·kg −1 with increasing PCC concentration owing to the surface spin pinning effect caused by a polymer shell. The average sizes of Fe 3 O 4 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 Fe 3 O 4 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.