Isotropic droplet transform

The term microemulsion indicates an optically transparent, thermodynamically stable, isotropic dispersion of nanometric-sized droplets of one liquid in another (immiscible) liquid, stabilized by interfacial layers of surfactant molecules. Note that there is no generally agreed extent of solubilization when a micellar solution can be said to have transformed into a microemulsion [99]. However, in case of water solubilization, Pileni [100] indicates that when the [water]/[surfactant] molar ratio (= w) exceeds a value of 15, we have a microemulsion, below which the term reverse micelle is preferred. In this text, this differentiation has not been strictly adhered to instead, a general term reverse microemulsion has often been used as a matter of convenience. 

W/o microemulsion solutions are mostly transparent, isotropic liquid media with nanosized water droplets that are dispersed in the continuous oil phase and stabilized by surfactant molecules at the water/oil interface. These surfactant-covered water pools offer a unique microenvironment for the formation of nanoparticles. They not only act as microreactors for processing reactions but also exhibit the process aggregation of particles because the surfactants could adsorb on the particle surface when the particle size approaches to that of the water pool. As a result, the particles obtained in such a medium are generally very fine [76]. Inverse microemulsion droplets, however, are slightly polydisperse due to less strict transformation of... 

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