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The present study deals with rapid, green method and large-scale synthesis of magnetite nanoparticles (Fe3O4NPs) by Uncaria tomentosa leaves aqueous extract at ambient temperature. Crystal growth of magnetite nanoparticles using the processor; ferrous chloride (FeCl2), ferric chloride (FeCl3) and U. tomentosa leaves aqueous extract was formed within 5min at room temperature. Fe3O4NPs synthesized using prucessor FeCl2 have advantage due to U. tomentosa acts as partial oxidizing agent Fe(II) to Fe(III) and then reducing agent to form magnetite nanoparticles (FeO.Fe2O3) and at the same time gave smaller average particle size 20nm. Synthesized Fe3O4NPs were characterized by Ultra-violet visible spectrophotometer (UV-vis), Fourier transform infrared spectroscopy (FT-IR), Transmission electron microscopy (TEM), and X-ray diffraction (XRD). Magnetite nanoparticles showed better green peach aphid activity than reference.

Magnetite (Fe3O4) Nanoparticles Synthesis and Anti Green Peach Aphid Activity (Myzuspersicae Sulzer)