Abstract
The Effects of tetraalkylammonium ions on the stability of dilute o/w emulsion were investigated with turbidimetric measurements. Large tetraalkylammonium ions were found to induce flocculation of emulsions stabilized by ionic emulsifiers at concentration 3 order of magnitudes lower compared to sodium ions. Emulsions stabilized by nonionic surfactant were also destabilized by low concentrations of organic ions. Inclusion complex formation of sodium ions with a crown ether, was found to drastically decrease the stability of the emulsion. All these observations demonstrate the importance of ion size and ion hydrophobicity on the stability of emulsions in presence of electrolyte. NMR self-diffusion measurements in micellar systems, monitoring ion-emulsifier interactions, and studies of the phase behaviour of the emulsifier/organic ion systems have been performed in an attempt to rationalize these observations.
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