International Journal of Nano and Material Sciences
ISSN: 2166-0182 (online)Search Article(s) by:
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Table of Content for Vol. 5 No. 1, 2016

Evaluation of Minimum Inhibitory Concentration of Silver Nanoparticles against Gram Positive and Gram Negative Bacteria
Richa Peeyush Karnani, Shashikant Vaidya and Abhay Chowdhary
      
 PP. 1 - 8
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ABSTRACT: A comparative evaluation of synthesized silver nano particles using two different procedures (biological by Tylophora indica plant and chemical reduction methods) and effect of these synthesized nanoparticles against gram positive bacteria Staphylococcus aureus and gram negative bacteria Eschericia coli were investigated. The synthesized nanoparticles were characterised using UV–visible absorption spectrophotometry and shape and size was determined by Transmission electron microscopy (TEM). Biologically synthesized silver nanoparticles (BAgNPs) were observed at 423 nm with particle sizes of 20 nm. The chemically synthesized silver nanoparticles (CAgNPs) showed a maximum peak at 422 nm with particle sizes of 10 nm. Both type of nanoparticles showed the most pronounced antibacterial potency against gram negative compare to gram positive bacteria as denoted by the zone of inhibition (ZoI). The microdilution method evaluated allows the testing of silver nanoparticles in multiple concentrations to determine the minimum inhibitory concentration. The current study therefore reported that the synthesized AgNPs were efficient against bacteria at lower concentration which can be comparable to standard ampicillin drug.


Photocatalytic Degradation of Brilliant Green Dye by SnO2/TiO2 Nanocatalysts
Shawky M. Hassan, Mohammed A. Mannaa
      
 PP. 9 - 19
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ABSTRACT: TiO2 and SnO2/TiO2 photocatalysts were prepared by a sol-gel method using different SnO2 content (0–20 wt.%). The samples were calcined at 500oC and characterized by UV–vis absorption spectroscopy. The photocatalytic activity was tested by the photodegradation of Brilliant green (BG) under the UV–vis irradiations. The results showed that the degradation of BG over SnO2/TiO2 nanocatalysts was much higher than that of TiO2 and 10% SnO2/TiO2 exhibited the higher photocatalytic activity. The effects of BG concentration, SnO2 content and catalyst weight on the photocatalytic activity of the SnO2/TiO2 nanocatalysts were studied.