A wetting transition in the three-component system water/hexadecane/C 6E2, where C6E2 denotes the surfactant C6H13 (OC2H4)2 OH, is found to occur in the three-phase region at the temperature T w = 49.1±0.1°C. Above Tw, the middle surfactant-rich phase wets the interface between the excess water and the excess oil phases, while below Tw it does not.
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Robert et al. (1988) studied this question.
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