Examination was made of interactions between an oil/water interface and latex and vesicle particles by measuring adsorbance in a suspension, particle size distribution and interfacial tension. The following results were obtained.
In a diisobutylketone/water+amphoteric latex system, particles were found to be transported from the water phase to oil phase. However, in cyclohexane containing AOT an increased absorbance of an aqueous suspension was observed at acidic pH. The flocculation of suspended particles would thus appear to occur through the neutralization of positive charges on the latex surface by negative charges in AOT molecules. In a diisobutylketone/PC vesicle system, increased absorbance in suspension was also noted. Analysis of particle size distribution in the suspension indicated swelling and flocculation to be accelerated by solubilization of the oil phase into vesicles. However, on using cyclohexane, the dispersion of PC vesicles was stabilized. Surface tension measurement indicated adsorbed PC at the interface to prevent direct interaction of the oil phase with PC vesiclrs.