Ozkan Sveta Zhiraslanovna, Kostev Aleksandr Ivanovich, Chernavskii Petr Aleksandrovich, Karpacheva Galina Petrovna
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russia.
Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119991 Moscow, Russia.
Polymers (Basel). 2022 Jul 20;14(14):2935. doi: 10.3390/polym14142935.
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 cobalt concentration. The reduction of metals occurs due to the hydrogen released during the dehydrogenation 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 κS = 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%.
首次开发了一种基于聚-N-苯基邻氨基苯甲酸（P-N-PAA）和磁性纳米颗粒（MNP）的含钴和铁纳米材料的一步制备方法。为了合成MNP/P-N-PAA纳米复合材料，通过将钴（II）盐溶解在具有核壳结构的基于Fe3O4/P-N-PAA的磁性流体中来获得前驱体。在前驱体于惰性气氛中在T = 700−800 °C下进行红外加热期间，钴与Fe3O4还原产物相互作用，这导致形成尺寸范围在20 < d < 50 nm和120 < d < 400 nm的各种球形Co-Fe、γ-Fe、β-Co和Fe3C纳米颗粒的混合物。MNP/P-N-PAA纳米复合材料的相组成显著取决于钴浓度。金属的还原是由于聚合物链的苯二胺单元脱氢过程中释放的氢气所致。与纯Fe3O4/P-N-PAA（MS = 18.41−27.58 emu/g）相比，在纳米复合材料组成中引入10−30 wt%的钴会导致MNP/P-N-PAA的饱和磁化强度显著增加（MS = 81.58−149.67 emu/g）。磁滞回线的矩形比常数为κS = MR/MS = 0.040−0.209。MNP/P-N-PAA纳米材料的电导率对频率的依赖性不大，达到1.2 × 10−1 S/cm。在1000 °C的氩气流中，残留物为77−88%。
