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Das, Ratan
- Determination of Intrinsic Strain in Poly(Vinylpyrrolidone)-Capped Silver Nano-Hexapod Using X-Ray Diffraction Technique
Abstract Views :223 |
PDF Views:75
Authors
Ratan Das
1,
Sumit Sarkar
1
Affiliations
1 Nano-Physics and Nanotechnology Research Lab, Department of Physics, Tripura University, Tripura 799 022, IN
1 Nano-Physics and Nanotechnology Research Lab, Department of Physics, Tripura University, Tripura 799 022, IN
Source
Current Science, Vol 109, No 4 (2015), Pagination: 775-778Abstract
Poly(vinylpyrrolidone)-capped silver nano-hexapods (AgNHs) have been prepared by chemical reduction method using ethylene glycol as a reducing agent, for the study of their structural and elastic properties. HRTEM study reveals that the prepared nanocrystals are hexapod in shape with an average size of approximately 50 nm. From the analysis of the X-ray diffraction pattern, intrinsic strain produced in the nano-hexapod due to dislocation of silver atoms, has been determined from the W-H plot. The lattice constant of the AgNHs has also been determined from Nelson-Riley plot. Higher value of dislocation density confirms that there may exist intrinsic strain in the nanocrystals.Keywords
Elastic Properties, Nanocrystalline Materials, Poly(Vinylpyrrolidone), X-ray Diffraction.Full Text
- Different Anisotropic Silver Nanocrystals Show Different Antibacterial Activities – An Effect of Different Prominent Crystallographic Orientations in Different Shapes
Abstract Views :234 |
PDF Views:70
Authors
Affiliations
1 Nano-Physics and Nanotechnology Research Laboratory, Department of Physics, Tripura University, Suryamaninagar 799 022, IN
2 Department of Microbiology, University of Calcutta, Kolkata 700 019, IN
1 Nano-Physics and Nanotechnology Research Laboratory, Department of Physics, Tripura University, Suryamaninagar 799 022, IN
2 Department of Microbiology, University of Calcutta, Kolkata 700 019, IN
Source
Current Science, Vol 118, No 12 (2020), Pagination: 1903-1910Abstract
The antibacterial activity of silver (Ag) nanoparticles is well established and various researchers have provided different explanations for the same. We have tested the activity of similar-sized anisotropic Ag nanocrystals. Silver nanocubes and nanohexagons were prepared and their antibacterial activity was tested against a few bacteria such as Bacillus cereus, Escherichia coli, Salmonella typhi, Staphylococcus epidermidis, Klebsiella pneumonia, Vibrio parahaemolyticus and Pseudomonas aeruginosa. It was found that the two shapes were active against all these bacteria. However, the plot of cell density of different bacterial pathogens against the concentration of silver nanocrystals was found to be different for these two shapes. Moreover, half maximal inhibitory concentration value and minimum bactericidal concentration value were also different for the two shapes. XRD analysis showed that both the nanocrystals were crystalline in nature, but their crystallographic orientation was different. So, it can be inferred from this study that some crystallographic planes are probably more active towards reaction with different bacterial compositions and hence, responsible for stronger antibacterial activity.Keywords
Antibacterial Activity, Anisotropic Silver Nanocrystals, Crystallographic Planes, Half Maximal Inhibitory Concentration, Minimum Bacterial Concentration.Full Text
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