Green Synthesis approach has been adopted to synthesize magnesium oxide (MgONPs) nanoparticles using Chamaemelum nobile flowers aqueous extract in one-pot reaction. The synthesized magnesium hydroxide and oxide nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The Scanning electron microscopy (SEM) micrographs of synthesized MgONPs showed the smooth surface and random arrangement of MgO nanoflakes with an average thickness of less than 10 nm with an average size of 20–40 nm. Formation of MgO mesoporous structure can be attributed to the presence of C. nobile flowers on the surface of nanoflakes. The highest mortality percent (%) of 1^st and 2^nd nymphal instars of the grren peach aphid was at 8000 (µg/ml) concentration of MgONPs. It was 86% after 24 hrs, and then reached 88% after 48 and 100% after 72 hours, while mortality increased at 4000 (µg/ml) concentration and reached 86 after 48 hrs and 100% after 72 hrs. The lowest mortality was at using 250 (µg/ml) after 24 hrs then increased to 49 and 88% after 48 and 72 hrs, respectively. The mortalities in case of control were significantly the least after 24, 48 and 72 hrs compared with the other treatments. While the highest mortality% of 3^rd and 4^th nymphal instars of the green peach was at 8000 (µg/ml) concentration of MgONPs. It was 78% after 24 hrs, and then reached 83, 98% after 48 and 72 hrs, respectively. While mortality at 4000 (µg/ml) concentration and reached 81, 97% after 48 and 72 hrs, respectively. The lowest mortality was at 250 (µg/ml) after 24 hr then increased to 41 and 87% after 48 and 72 hrs, respectively.

Keywords: Green synthesis, Magnesium oxide nanoparticles, Chamaemelum nobile flowers extract, Green peach aphid, Mortality.

Biography:
The presenter Alaa Y. Ghidan, the PhD at The Jordan University, and she has six publications about the same field of nanotechnology, synthesis as an eco-friendly method.

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