By a News Reporter-Staff News Editor at Life Science Weekly -- Research findings on Nanoparticles are discussed in a new report. According to news reporting out of Toledo, Ohio, by NewsRx editors, research stated, "Noble-metal nanoparticles have had a substantial impact across a diverse range of fields, including catalysis, sensing, photochemistry, optoelectronics, energy conversion and medicine. Although silver has very desirable physical properties, good relative abundance and low cost, gold nanoparticles have been widely favoured owing to their proved stability and ease of use."
Our news journalists obtained a quote from the research from the University of Toledo, "Unlike gold, silver is notorious for its susceptibility to oxidation (tarnishing), which has limited the development of important silver-based nanomaterials. Despite two decades of synthetic efforts, silver nanoparticles that are inert or have long-term stability remain unrealized. Here we report a simple synthetic protocol for producing ultrastable silver nanoparticles, yielding a single-sized molecular product in very large quantities with quantitative yield and without the need for size sorting. The stability, purity and yield are substantially better than those for other metal nanoparticles, including gold, owing to an effective stabilization mechanism. The particular size and stoichiometry of the product were found to be insensitive to variations in synthesis parameters. The chemical stability and structural, electronic and optical properties can be understood using first-principles electronic structure theory based on an experimental single-crystal X-ray structure. Although several structures have been determined for protected gold nanoclusters, none has been reported so far for silver nanoparticles. The total structure of a thiolate-protected silver nanocluster reported here uncovers the unique structure of the silver thiolate protecting layer, consisting of Ag2S5 capping structures. The outstanding stability of the nanoparticle is attributed to a closed-shell 18-electron configuration with a large energy gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital, an ultrastable 32-silver-atom excavated-dodecahedral core consisting of a hollow 12-silver-atom icosahedron encapsulated by a 20-silver-atom dodecahedron, and the choice of protective coordinating ligands."
According to the news editors, the research concluded: "The straightforward synthesis of large quantities of pure molecular product promises to make this class of materials widely available for further research and technology development."
For more information on this research see: Ultrastable silver nanoparticles. Nature, 2013;501(7467):399-402. (Nature Publishing Group - www.nature.com/; Nature - www.nature.com/nature/)
Our news journalists report that additional information may be obtained by contacting A. Desireddy, Dept. of Chemistry, University of Toledo, Toledo, Ohio 43606, United States. Additional authors for this research include B.E. Conn, J. Guo, B. Yoon, R.N. Barnett, B.M. Monahan, K. Kirschbaum, W.P. Griffith, R.L. Whetten, U. Landman and T.P Bigioni (see also Nanoparticles).
Keywords for this news article include: Ohio, Toledo, United States, Nanotechnology, Metal Nanoparticles, Emerging Technologies, North and Central America.
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