Hamed Hajimirzababa’s research while affiliated with Islamic Azad University, Tehran and other places

The aim of this study is to check the effect of different morphologies of silver nanoparticles such as spherical, polygonal, disk, prism, and hierarchical on antimicrobial characteristics of cotton fabrics. Nanosilver particles have been synthesized in different morphologies. Then, the colloid nanosilver particles were applied to the cotton fabric pieces for 25 ppm by ultrasonic method in ambient temperature. Silver nanoparticles solutions were characterized by UV–visible and infrared absorption spectroscopies, scanning and transmission electron microscopies as well as antimicrobial tests which ultimately showed that non-spherical morphologies such as polygonal, prism, and hierarchical like shapes in comparison with spherical and disc morphologies exhibited stronger growth inhibitory effect against gram-negative bacterium Escherichia coli and gram-positive Staphylococcus aureus after five replicate standard washing processes. In addition, among various tested morphologies, the hierarchical like morphology showed a very well antimicrobial activity over 91% after five washing cycle.

Silver nanoparticles (Ag-NPs) are increasingly being incorporated in a variety of products, textiles, and in healthcare, mainly due to their antibacterial properties. The present study investigated the antimicrobial efficiency and colour changes of floor covering loaded with colloidal silver nanoparticles via a simple and cost-effective method. The influences of colloidal concentration on antimicrobial activity against Escherichia coli and Staphylococcus aureus as well as laundering durability were studied. The results of the silver-treated floor covering (nylon 6 piles) with 50 - 100 ppm dilution exhibited outstanding antimicrobial efficiency and indicated a 99.42% reduction in Staphylococcus aureus and a 79.25% reduction in Escherichia coli. Furthermore, the bioactivity of Ag-NPs was maintained even after ten washings. The removal of silver nanoparticles in wastewater was investigated by UV-visible spectroscopy. Scanning electron microscopy (SEM) and EDX were employed to confirm the presence of nano silver on the surface. The results indicated that Gram positive bacteria are more tolerant to silver than Gram negative bacteria. An appropriate antimicrobial agent deposited on floor covering can prevent unpleasant odours and growth of pathogenic microorganisms.