Nanoparticles of silver chloride were prepared by direct precipitation of silver ions with the surfactant
counterion in the water pools of microemulsions formed by dioctyldimethylammonium chloride in an
organic n-decanol/isooctane phase. This work represents a new concept to form nanoprecipitates using a
single reverse micellar system. The net result is a fast reaction with less dependency on the intermicellar
exchange of solubilizate. The effects of the surfactant and cosurfactant concentrations, of the mole ratio
of water to surfactant, R, and of the loading of silver nitrate were evaluated. Increasing the surfactant
concentration at fixed values of R and moles of silver nitrate resulted in a higher dependency on the reverse
micellar exchange dynamics and increased the particle size. At high n-decanol concentration, the particle
size increased due to decreasing the interaction between the nanoparticles and the stabilizing surfactant
layer. Similar results were found at high values of R. Increasing the amount of silver nitrate resulted in
the formation of more nuclei, and hence in the production of smaller particles. The trends in the particle
size and the size distribution were followed using UV spectrophotometry and transmission electron
microscope photographs.