Nanotechnology
Zahraa S. Ghazi; Mohammad R. Mohammad; Manal A. Abbood; Amal A. Hussein
Abstract
Silver nanoparticles were prepared by the chemical reduction method. Silver nitrate was taken as a metal precursor and sodium borohydride as a reducing agent with polyvinyl alcohol (PVA) stabilizers of different concentrations, polyvinylpyrrolidone (PVP). X-ray diffraction (XRD), transmission electron ...
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Silver nanoparticles were prepared by the chemical reduction method. Silver nitrate was taken as a metal precursor and sodium borohydride as a reducing agent with polyvinyl alcohol (PVA) stabilizers of different concentrations, polyvinylpyrrolidone (PVP). X-ray diffraction (XRD), transmission electron microscopy (TEM), and atomic force microscopy (AFM) techniques have been used, these measurement results showed that the prepared material is silver nanoparticles. The average size of silver nanoparticles using the Scherrer equation with values ranging from 8.49-12.15nm. TEM images showed that the silver nanoparticles are spherical in size between 5-47nm. Nanoscale distribution of silver nanoparticles (AgNPs) prepared at different concentrations was studied by AFM. Silver nanoparticles showed high antimicrobial and antibacterial activity against Gram-positive bacteria such as Escherichia Coli and Gram-negative Staphylococcus aureus, whose bacterial activity was dependent on the concentration of PVA and PVP and the degree of intramolecular accumulation. Low concentrations of PVP lead to increase the activity, while high concentrations of PVA give better activity.
Nanotechnology
Anwar Sabri Jawad; Qasim N. Thewaini; Sharafaldin Al-Musawi
Abstract
Aluminum oxide, often known as Al2O3, is a chemical compound of aluminum and oxygen with the formula Al2O3. It's the most common of many aluminum oxides, known as aluminum (III) oxide. The study investigates the cytotoxicity and antibacterial effects of Aluminum oxide nanoparticles (Al2O3-NPs) in different ...
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Aluminum oxide, often known as Al2O3, is a chemical compound of aluminum and oxygen with the formula Al2O3. It's the most common of many aluminum oxides, known as aluminum (III) oxide. The study investigates the cytotoxicity and antibacterial effects of Aluminum oxide nanoparticles (Al2O3-NPs) in different cells and bacteria. Different characterization methods such as dynamic light scattering (DLS), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) have been used to evaluate morphologies and physicochemical properties of Al2O3-NPs. MTT technique is used for determining NPs cytotoxicity. The size distribution of Al2O3-NPs was 68 ± 12 nm in diameter, while the zeta potential was (-36 ± 10 mV). There is no toxicity by using the MTT assay, as well as showed antibacterial activity was formed at 200 µg/mL, while the higher antibacterial activity was occurring at (18 ± 0.2) and (17 ± 0.1) for Proteus Vulgaris and Streptococcus pyogenes, respectively. The findings confirmed that the Al2O3-NPs have small dimensions, high stability, and increased antibacterial activity.
