Abstract
The influence of the KNO3 concentration and the temperature, time, and crystallization method on the size and morphology of KNO3 powders prepared from reverse micellar solutions of the surfactants (Tergitol NP-4 and Tergitol NP-4 + AOT) in decane by isothermal mass crystallization was studied. In spite of the coincidence of the characteristics of the initial microemulsions (hydrodynamic diameter of micelles, interfacial tension, water and salt concentrations), the addition of AOT enhances the dispersion of the powders. The growth of the particle size is observed when the evaporation temperature increases from 35 to 45 °C. The control of the KNO3 content in the microemulsions made it possible to determine reliably the amount of the salt that became solid at different stages of crystallization.
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