COALESCENCE OF SINGLE DROPS AT A LIQUID-LIQUID INTERFACE IN THE PRESENCE OF SURFACTANTS/POLYMERS

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Abstract
The stability of single oil droplets at a liquid-liquid interface in the presence of surfactants/polymers was investigated and the coalescence time of oil droplets at an oil-aqueous surfactant solution interface was measured in a specially constructed coalescence cell. A unique feature of the experimental set-up was that the drop size could be controlled quite accurately and was independent of the interfacial tension and the difference in the densities of the two phases used. The coalescence time of oil droplets correlated favorably with interfacial viscosity of the system. However, no correlation was found between interfacial tension and coalescence time or the rate of coalescence. Both the coalescence time and interfacial viscosity were found to be strong functions of the surfactant concentration.

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