Nonionic Surfactant and Oil

Polyethylene oxide is not soluble in hydrocarbons such as hexane or decane. If a fatty chain is attached to a short segment of polyethylene oxide (4 to 8 ethylene oxide units), the nonionic amphiphile obtained exhibits a solubility profile in oil 

11 (a) Haze point temperature (CP, critical point amph, amphiphile). (b) Haze 

The critical temperature Ta is often referred to as the haze point temperature, and the miscibility gap between oil and amphiphile plays an essential role in the ternary phase diagram. 

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Figure 4.4. Schematic phase diagrams as a function of temperature of the three binary mixtures, oil/water, water/nonionic surfactant and oil/nonionic surfactant, showing critical points (cps) and tie-lines within the 2 phase regions. Reproduced by permission of Wiley-VCH (redrawn from Kahlweit and Strey (25))...

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