CALORIMETRIC INVESTIGATION OF THE FORMATION OF ZNS NANOPARTICLES IN WO MICROEMULSIONS/

The enthalpies of precipitation of ZnS nanoparticles within water cont aining reversed micelles of sodium bis(2-ethylhexyl) solfosuccinate, L -alpha phosphatidylcholine, tetraethyle-negycol-mono-n-dodecyl ether a nd didodecyldimethylammonium bromide as a function of the molar concen tration ratio R (R=[water]/[surfactant]) were measured by calorimetric technique. The results indicate that the energetic state of ZnS nanop articles confined in the aqueous core of the reversed micelles is diff erent from that in bulk water. Effects due to nanoparticle size, adsor ption of HS- ions on the nanoparticle surface and interactions between nanoparticles and water/surfactant interfaces are discussed.