Abstract
Powder of metal oxide nanoparticles (NPs) of CuO, NiO, and ZnO was proposed for membrane applications such as microfiltration devices. The formed phases were identified by X-ray phase analysis. The produced powder was characterized by high-resolution scanning electron microscope. A study on the factors influencing the antimicrobial activities of metal oxide (CuO, NiO, and ZnO) NPs was taken up. They were prepared by solution combustion method using glycine as fuel. X-ray diffraction pattern confirms the crystalline nature of the metal oxide NPs. The field emission scanning electron microscope images confirm the shape and size of the prepared metal oxide NPs. The CuO, NiO, and ZnO NPs are floral, octahedral, and flake-like in shape, respectively. Upon comparison of the experimental results, it was revealed that the antibacterial activity of NPs was influenced by not only their crystal size but also by shape, crystalline nature, purity, and uniformity of nanocrystals. And it is found that shape is a dominant factor than the other and bigger NPs with different shape exhibit highly effective antimicrobial activity. Further studies have to be done on the small-sized different-shaped NPs that could exhibit excellent antimicrobial activity than the present study.
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