Abstract
General trends in water and oil uptake in saturated microemulsions are correlated by idealized ternary diagrams. Winsor’s types of saturated micro-emulsions are assigned phase regions on the idealized diagram for the pseudo-3-component system: surfactant, oil and aqueous solution. Systematic shifts in these phase regions reflect changes in temperature, salinity, oil composition, surfactant head and chain size and other HLB parameters. Shinoda’s phase diagrams for nonionic surfactants are explained by the idealized ternary diagrams stacked along a temperature axis. The systematic transition in microemulsion type with temperature is shown with stacked ternaries. Saturation water and oil uptake in microemulsions made with ethox-ylated alkyl phenols are related to the ternary diagram. Water uptake increases and oil uptake decreases with increasing head/chain volume ratio and decreasing temperature or aromatics/paraffinics ratio in the oil. The interchangeability of the parameters surfactant head/chain volume ratio, surfactant/co-surfactant ratio (HLB), temperature, oil composition and aqueous phase salinity for controlling saturation water and oil up-take is demonstrated.
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