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Journal of Nanomaterials
Volume 2010, Article ID 948941, 7 pages
http://dx.doi.org/10.1155/2010/948941
Research Article

Synthesis of Silver Nanoparticles by Precipitation in Bicontinuous Microemulsions

Centro de Investigación en Química Aplicada, Boul. Ing. Enrique Reyna No. 140, Saltillo, Coahuila 25253, Mexico

Received 21 December 2009; Accepted 9 March 2010

Academic Editor: Sherine Obare

Copyright © 2010 Pamela Y. Reyes 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.

Abstract

Silver nanoparticles precipitation was carried out at in bicontinuous microemulsions stabilized with a mixture of surfactants sodium bis (2-ethylhexyl) sulfosuccinate/sodium dodecyl sulfate (2/1, w/w) containing an aqueous solution of 0.5 M silver nitrate and toluene as organic phase. Various concentrations of aqueous solution of sodium borohydride (precipitating agent) and their dosing times on microemulsions were studied. Regardless of dosing time, higher and medium concentrations of precipitating agent promoted the formation of worm-like nanostructures, while the lowest concentration allowed to obtain a mixture of isolated silver nanoparticles (mean diameter  nm) and worm-like nanostructures. Experimental yields much higher than those typical in precipitation of silver nanoparticles in reverse microemulsions were obtained. An explanation for formation of worm-like nanostructures based on the development of local zones inside the microemulsions channels with high particle concentrations was proposed.