Structurally related electromagnetic properties of NixFeyO4 nanomaterials synthesized by granulated sodium alginate

In regard to the synthesis of Ni x Fe y O 4 nanoparticles , a new process was presented that used granulated sodium alginate (Na-ALG) prepared by a high-shear wet granulator (HSWG). By using this synthesis route, Na-ALG granules were added directly into metal salt solutions to obtain respective ferrite oxide nanoparticles based on a solid-liquid ion-exchange reaction. The different Ni x Fe y O 4 nanopowder samples were verified by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Significant increases in the particle sizes were observed with increased calcination temperatures in this investigation. The structural analysis of Ni x Fe y O 4 obtained by XRD Rietveld refinement agreed with the simulated models using the Materials Studio (MS) software. The structural differences of Ni x Fe y O 4 due to the increasing Ni 2+ concentrations from 0.4 to 1.43 mol were investigated with nominal compositions and confirmed by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The magnetic investigations were carried out using a vibrating sample magnetometer (VSM) and a maximum saturation magnetization (Ms = 37.26 emu/g) was recorded at 20000 Oe with the Ni 0.4 Fe 2.6 O 4 nanoparticles. All samples showed supermagnetic properties when the Ms values decreased as the Ni 2+ concentrations increased. Finally, the synthesized Ni x Fe y O 4 samples exhibited excellent discharge-storage capacities even after 200 cycles. This new process not only ensured that the operation was easier to scale up but also much greener since it consumed less than 4% of the water compared with other processes in the literature.