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Comptes Rendus Chimie
Volume 18, n° 4
pages 410-421 (avril 2015)
Doi : 10.1016/j.crci.2014.07.008
Received : 21 May 2014 ;  accepted : 29 July 2014
Colloids based on gold nanoparticles dispersed in castor oil: Synthesis parameters and the effect of the free fatty acid content
Colloïdes à base de nanoparticules d’or dispersées dans de l’huile de ricin : paramètres de synthèse et l’effet de la teneur en acide gras libre
 

Sara F.A. Morais, Monique G.A. da Silva, Simoni M.P. Meneghetti, Mario R. Meneghetti
 Grupo de Catálise e Reatividade Química, Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió, AL, Brazil 

Corresponding author.
Abstract

Herein, we present our results related to the synthesis of colloidal solutions of gold nanoparticles (AuNPs) dispersed in castor oil. These colloids were prepared via a wet chemistry process by mixing specific amounts of castor oil, ethanol, and aqueous solutions of tetrachloroauric(III) acid and sodium hydroxide. The size and shape of the AuNPs obtained could be modulated by the amount of gold source added and the Au/OH molar ratio used. In this study, we observed that the free fatty acid content in the reaction medium was an important parameter to be considered in the syntheses of the colloidal solutions and the respective form and shape of the AuNPs produced. Thus, we evaluated the effect of oil acidity by adding different amounts of myristic acid (MA) in the reaction medium. The colloids were characterized by UV–vis spectroscopy, and the size and shape of the AuNPs produced were characterized by transmission electron microscopy (TEM).

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Keywords : Colloids, Gold nanoparticles, Castor oil, Stabilization of colloids, Oil acidity




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