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Journal of Nanomaterials
Volume 2010 (2010), Article ID 392572, 6 pages
Research Article

High-Yield Synthesis of Silver Nanoparticles by Precipitation in a High-Aqueous Phase Content Reverse Microemulsion

1Centro de Investigación en Química Aplicada, Boul. Ing. Enrique Reyna No. 140, Saltillo, Coahuila, 25253, Mexico
2Departamento de Ingeniería Química, Universidad de Guadalajara, Boul. M. García Barragán No. 1451, Guadalajara, Jalisco, 44430, Mexico

Received 28 August 2009; Revised 13 November 2009; Accepted 8 January 2010

Academic Editor: Michael Wong

Copyright © 2010 Y. D. Sosa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Silver nanoparticles were precipitated at 70°C in a reverse microemulsion containing a high concentration of 0.5 M silver nitrate aqueous solution, toluene as organic phase, and a mixture of surfactants sodium bis (2-ethylhexyl) sulfosuccinate/sodium dodecyl sulfate (2/1, w/w). Nanoparticles were characterized by X-ray diffraction, atomic absorption spectroscopy, and high-resolution transmission electron microscopy. In spite of the high-water/surfactant molar ratio and concentration of silver nitrate solution used in this study, characterizations demonstrated that nanoparticles were silver crystals (purity >99%) with 8.6–8.8 nm in average diameter and 2.9–4.7 nm in standard deviation. It is proposed that slow dosing rate of aqueous solution of precipitating agent and the small molecular volume of toluene attenuated both particle aggregation and polydispersity widening. Experimental yield of silver nanoparticles obtained in this study was much higher than theoretical yields calculated from available data in the literature on preparation of silver nanoparticles in reverse microemulsions.