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Biosynthesis of silver nanoparticles.

Journal of nanoscience and nanotechnology (2014-04-23)
Subin Poulose, Tapobrata Panda, Praseetha P Nair, Thomas Théodore
ABSTRACT

Metal nanoparticles have unique optical, electronic, and catalytic properties. There exist well-defined physical and chemical processes for their preparation. Those processes often yield small quantities of nanoparticles having undesired morphology, and involve high temperatures for the reaction and the use of hazardous chemicals. Relatively, the older technique of bioremediation of metals uses either microorganisms or their components for the production of nanoparticles. The nanoparticles obtained from bacteria, fungi, algae, plants and their components, etc. appear environment-friendly, as toxic chemicals are not used in the processes. In addition to this, the formation of nanoparticles takes place at almost normal temperature and pressure. Control of the shape and size of the nanoparticles is possible by appropriate selection of the pH and temperature. Three important steps are the bioconversion of Ag+ ions, conversion of desired crystals to nanoparticles, and nanoparticle stability. Generally, nanoparticles are characterized by the UV-visible spectroscopy and use of the electron microscope. Silver nanoparticles are used as antimicrobial agents and they possess antifungal, anti-inflammatory, and anti-angiogenic properties. This review highlights the biosynthesis of silver nanoparticles by various organisms, possible mechanisms of their synthesis, their characterization, and applications of silver nanoparticles.

MATERIALS
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Sigma-Aldrich
Silver nanowires, diam. × L 100 nm × 6 μm, 0.5% (isopropyl alcohol suspension)
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Silver nanowires, diam. × L 50 nm × 6 μm, 0.5% (isopropyl alcohol suspension)
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Sigma-Aldrich
Silver, conductive paste
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500 mg
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Sigma-Aldrich
Silver, colloidal, 65-75% Ag basis
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Silver, foil, thickness 1.0 mm, 99.99% trace metals basis
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500 mg
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Silver, foil, 8mm disks, thickness 0.125mm, as rolled, 99.99+%
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Silver, foil, light tested, 150x150mm, thickness 0.05mm, annealed, 99.95+%
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Silver, foil, light tested, 150x150mm, thickness 0.05mm, as rolled, 99.95+%
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Silver, foil, not light tested, 150x150mm, thickness 0.025mm, as rolled, 99.95+%
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500 mg
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Silver, foil, not light tested, 25x25mm, thickness 0.006mm, 99.97%
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500 mg
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Silver, foil, 8mm disks, thickness 1.0mm, as rolled, 99.95+%
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500 mg
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Silver, foil, light tested, 50x50mm, thickness 0.02mm, 99.97%
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500 mg
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Silver, rod, 100mm, diameter 3.5mm, as drawn, 99.95+%
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500 mg
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Silver, wire reel, 50m, diameter 0.35mm, annealed, 99.99%
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500 mg
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Silver, sphere, 100pcs, diameter 0.5mm, precision sphere grade
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Silver, tube, 500mm, outside diameter 0.7mm, inside diameter 0.3mm, wall thickness 0.2mm, as drawn, 99.95+%
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500 mg
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Silver, wire reel, 2m, diameter 0.025mm, as drawn, 99.99%
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500 mg
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Silver, wire reel, 1m, diameter 0.8mm, as drawn, 99.99%
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Silver, tube, 500mm, outside diameter 10mm, inside diameter 8mm, wall thickness 1.0mm, as drawn, 99.95+%
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Silver, tube, 500mm, outside diameter 6.0mm, inside diameter 4mm, wall thickness 1.0mm, as drawn, 99.95+%
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Silver, wire reel, 0.5m, diameter 0.25mm, as drawn, 99.997%
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500 mg
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Silver, wire reel, 1m, diameter 1.0mm, annealed, 99.99%
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Silver, foil, 150x150mm, thickness 0.1mm, as rolled, 99.95+%
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Silver, wire reel, 500m, diameter 0.05mm, annealed, 99.99%
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Silver, tube, 500mm, outside diameter 4.65mm, inside diameter 4.23mm, wall thickness 0.21mm, as drawn, 99.95+%
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Silver, foil, 150x150mm, thickness 0.20mm, as rolled, 99.95+%
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500 mg
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Silver, wire reel, 10m, diameter 0.05mm, annealed, 99.99%
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Silver, foil, 50x50mm, thickness 0.20mm, as rolled, 99.95+%
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Silver, wire reel, 500m, diameter 0.125mm, annealed, 99.99%
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500 mg
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Silver, wire reel, 20m, diameter 0.35mm, annealed, 99.99%
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