Fabrication of Highly Stable Silver Nanoparticle via Microemulsions:Influence of Operational Parameters

The silver nanoparticles by the reduction of AgNO3 with N2H4 via mixing two microemulsions are synthesized. Two microemulsions used in this study are composed of sodium bis(2-ethylhexyl) sulphosuccinate (AOT)/n-heptane/ water/ AgNO3 or N2H4. The effect of different parameters such as metal precursor concentration in aqueous phase [Ag+], water to AOT molar ratio (W) and reducing agent concentration in aqueous phase ([N2H4]) on the reaction were investigated. The reaction progress was monitored by time resolved UV–Vis absorption spectroscopy. Transmission electron microscopy (TEM) results show that the silver nanoparticles obtained are spherical. It is found that with increasing the silver nitrate concentration, the growth rates of particles is more rapid. The higher W value has been found to give larger particle size, and the resultant nanosilver colloid was highly stable and no precipitated particles are observed during three months time.

کلیدواژه ها:

Silver Nanoparticles ، sodium bis(2-ethylhexyl) sulphosuccinate AOT ، stable silver dispersions ، reversed micelles ، microemulsions