An Experimental Investigation of Stability of Microemulsions and Polydispersity Effects Using Light-Scattering Spectroscopy and Small Angle X-Ray Scattering
Laser light scattering and small angle X-ray scattering were used to study W/O and O/W microemulsions formed by n-tetradecane, sodium dodecyl sulfate, n-pentanol and water. Three of the four W/O systems were stable for long periods of time showing only small changes in size. These systems were fairly monodisperse. The fourth system studied was not stable, changing from a microemulsion to a molecular solution in a few days. The O/W system showed ordering due to strong charge interactions, and also had micelles coexisting with the microemulsion droplets. In all the systems studied, the disperse phase droplets were found to be spherical in shape.
KeywordsSodium Dodecyl Sulfate Hydrodynamic Radius Apparent Molecular Weight Microemulsion System Sodium Dodecyl Sulfate Micelle
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