The study was based on understanding the relationship between titanium (Ti) doping amount and magnetic heating performance of magnetite (Fe₃O₄). Superparamagnetic nanosized Ti-doped magnetite ((Fe_1−x,Ti_x)₃O₄; x = 0.02, 0.03 and 0.05) particles were synthesized by sol-gel technique. In addition to (Fe_1−x,Ti_x)₃O₄ nanoparticles, SiO₂ coated (Fe_1−x,Ti_x)₃O₄ nanoparticles were produced as core-shell structures to understand the effects of silica coating on the magnetic properties of nanoparticles. Moreover, the magnetic properties were associated with the Néel relaxation mechanism due to the magnetic heating ability of single-domain state nanoparticles. In terms of results, it was observed that the induced RF magnetic field for SiO₂ coated (Fe_0.97,Ti_0.03)₃O₄ nanoparticles caused an increase in temperature difference (ΔT), which reached up to 22 °C in 10 min. The ΔT values of SiO₂ coated (Fe_0.97,Ti_0.03)₃O₄ nanoparticles were very close to the values of uncoated Fe₃O₄ nanoparticles.

Medicinal plants can be used as reducing agents in the preparation of metal nanoparticles by green synthesis because of the chemotherapeutic and anti-infectious properties of natural compounds. Therefore, this paper reports the green synthesis of silver and iron nanoparticles from leaf and flower extracts of Nerium oleander and their capacity as anticancer and antimicrobial agents. Nanoparticle manufacturing and structural characterization of silver and iron nanoparticles are reported. The formation of nanoparticles is characterized by scanning electron microscopy with energy dispersive X-ray spectroscopy, UV-Vis and Fourier transform infrared (FTIR) spectroscopy. Nanoparticles formation was also investigated the surface charge, particle size, and distribution using zeta sizer analysis by DLS. Green synthesis of silver and iron nanoparticles using N. oleander showed different levels of selective cytotoxicity against K562 (human chronic myeloid leukemia cells) in low concentrations and were not cytotoxic to the HUVEC (human umbilical vein endothelial cells) in the same concentrations. Silver nanoparticles showed antibacterial activity against multidrug pathogens, while iron nanoparticles failed to show such activity. Results of the present research demonstrate the potential use of green synthesized nanoparticles in various biomedicine and pharmaceuticals fields in the future.