Resumo

GONZALEZ-MENDOZA, Alma Laura  e  CABRERA-LARA, Lourdes I.. Reaction Parameters for Controlled Sonosynthesis of Gold Nanoparticles. J. Mex. Chem. Soc [online]. 2015, vol.59, n.2, pp.119-129. ISSN 1870-249X.

The synthesis of gold nanoparticles by sonochemical technique has been previously performed with excellent results. The synthesis has been carried out in the presence of citric acid, a strong reducing agent, which allows the nucleation and growth of gold nanoparticles, at the same time that controls particle size. In this work, we report the use of sodium tartrate as a mild reducing agent that allows a better understanding of the effect of the reaction parameters during gold nanoparticle synthesis. A conventional sonication bath (37 kHz) was used for the sonochemical synthesis. This work focuses on the reaction temperature effect and the effect of sodium tartrate concentration. It was confirmed that particle size, and particle morphology is dependent of these two reaction parameters. Equally, colloidal stabilization was related to reaction temperature and sodium tartrate concentration. It was also determined that Ostwald ripening takes place during sonochemical reaction under our conditions, allowing us to understand the mechanism that takes place during synthesis. Gold nanoparticles with main particle size of 17 nm were achieved by this method.

Palavras-chave : Gold colloidal suspension; nanoparticles; sonosynthesis; sodium tartrate.

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