title: Study of antibacterial activity of Ag and Ag2CO3 nanoparticles stabilized over montmorillonite.
abstract: Silver carbonate and silver nanoparticles (NPs) over of stabilizer montmorillonite (MMT) have been synthesized in aqueous and polyol solvent, respectively. Dispersions of silver nanoparticles have been prepared by the reduction of silver nitrate over of MMT in presence and absence of Na2CO3 compound in ethylene glycol. It was observed that montmorillonite was capable of stabilizing formed Ag nanoparticles through the reduction of Ag(+) ions in ethylene glycol. Na2CO3 was used as carbonate source in synthesis of Ag2CO3 NPs in water solvent and also for controlling of Ag nanoparticles size in ethylene glycol medium. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and ultraviolet-visible diffuse reflectance spectroscopy (DRS). The TEM images showed that Ag NPs size in presence Na2CO3 salts was smaller than without that. The results indicated intercalation of Ag and Ag2CO3 nanoparticles into the montmorillonite clay layers. The diffuse reflectance spectra exhibited a strong surface plasmon resonance (SPR) adsorption peak in the visible region, resulting from Ag nanoparticles. The antibacterial testing results showed that the Ag2CO3-MMT nanocomposite exhibited an antibacterial activity higher than Ag-MMT sample against Escherichia coli.
authors.affiliation: Department of Chemistry, Faculty of Science, University of Guilan, P.O. Box 1914, Rasht, Iran. Electronic address: sohrabnezhad@guilan.ac.ir.
authors.forename: Sh
authors.initials: Sh
authors.lastname: Sohrabnezhad
authors.affiliation: Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Pourahmad
authors.affiliation: Department of Biology, Faculty of Science, University of Guilan, P.O. Box 1914, Rasht, Iran.
authors.forename: M J
authors.initials: MJ
authors.lastname: Mehdipour Moghaddam
authors.affiliation: Department of Chemistry, Faculty of Science, University of Guilan, P.O. Box 1914, Rasht, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Sadeghi
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D001546:Bentonite / Q000737:chemistry*; D002254:Carbonates / Q000737:chemistry* / Q000494:pharmacology; D020099:Coated Materials, Biocompatible / Q000737:chemistry / Q000494:pharmacology; D053768:Metal Nanoparticles / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D012834:Silver / Q000737:chemistry* / Q000494:pharmacology; D018030:Silver Compounds / Q000737:chemistry* / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared; D020349:Surface Plasmon Resonance; D014961:X-Ray Diffraction
chemical_list: D000900:Anti-Bacterial Agents; D002254:Carbonates; D020099:Coated Materials, Biocompatible; D018030:Silver Compounds; D001546:Bentonite; D012834:Silver; C033260:silver carbonate
keywords: Antibacterial activity; Diffuse reflectance spectroscopy; Montmorillonite; Silver nanoparticles; Surface plasmon resonance