M . G Hosseini - Electrochemical Research Laboratory, Faculty of Chemistry, University of Tabriz, Tabriz
R Najjar - Polymer Research Laboratory, Faculty of Chemistry, University of Tabriz, Tabriz, c)
M Shokri - Department of Applied Chemistry, Islamic Azad University, Tabriz Branch, P.O.Box ۱۶۵۵, Tabriz, Iran
S Sheikhy - Department of Applied Chemistry, Islamic Azad University, Tabriz Branch, P.O.Box ۱۶۵۵, Tabriz, Iran

The present paper will introduce the synthesis of platinum nanoparticles by the reduction of H2PtCl6 with NaBH4 in sodium bis(2-ethylhexyl) sulphosuccinate (AOT)/nheptane/ water/metal salt or reducing agent reversed micellar solutions. The effect of metal precursor concentration in aqueous phase ([H2PtCl6] = 0.4, 0.8 and 1.2 wt% as metallic Pt), water to AOT molar ratio (ω◦ = 4, 8 and 12) and reducing agent to metal saltmolar ratio ([NaBH4]/[H2PtCl6] = 5, 7.5 and 10) on the reaction were investigated. The reaction progress was monitored by time resolved UV–Vis absorption spectroscopy. The dispersions of the platinum nanoparticles obtained with 0.4 and 0.8 wt% of metallic Pt in aqueous phase were very stable and no precipitated particles were observed in three months time scale.

platinum Nanoparticles, sodium bis(2-ethylhexyl) sulphosuccinate AOT, stable platinum dispersions, reversed micelles, microemulsions