Novel hybrid nanomaterials based on poly-N-phenylanthranilic acid and magnetic nanoparticles with enhanced saturation magnetizationстатьяИсследовательская статья
Статья опубликована в высокорейтинговом журнале
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Аннотация:A one-step preparation method for cobalt- and iron-containing nanomaterials based on poly-N-phenylanthranilic acid (P-N-PAA) and magnetic nanoparticles (MNP) was developed for the first time. To synthesize the MNP/P-N-PAA nanocomposites, the precursor is obtained by dissolving a Co (II) salt in a magnetic fluid based on Fe3O4/P-N-PAA with a core-shell structure. During IR heating of the precursor in an inert atmosphere at T = 700–800 °C, cobalt interacts with Fe3O4 reduction products, which results in the formation of a mixture of spherical Co-Fe, γ-Fe, β-Co and Fe3C nanoparticles of various sizes in the ranges of 20 < d < 50 nm and 120 < d < 400 nm. The phase composition of the MNP/P-N-PAA nanocomposites depends significantly on the co-balt concentration. The reduction of metals occurs due to the hydrogen released during the de-hydrogenation of phenylenamine units of the polymer chain. The introduction of 10–30 wt% cobalt in the composition of nanocomposites leads to a significant increase in the saturation magnetization of MNP/P-N-PAA (MS = 81.58–149.67 emu/g) compared to neat Fe3O4/P-N-PAA (MS = 18.41–27.58 emu/g). The squareness constant of the hysteresis loop is кS = MR/MS = 0.040–0.209. The electrical conductivity of the MNP/P-N-PAA nanomaterials does not depend much on frequency and reaches 1.2 × 10–1 S/cm. In the argon flow at 1000 °C, the residue is 77–88%.