Abstract
In [CH 3–[CH 2] ( i−1) –[O–CH 2–CH 2] j –O–H] (C i E j ) non-ionic surfactant solutions, at different temperatures depending on the different i, j monomer compositions, the micellar aggregates undergo a change in shape from sphere to rod. At higher temperatures a phase separation occurs. Recently we have developed a method to investigate the interfacial composition of non-ionic micellar solutions by means of dielectric spectroscopy. We applied this methodology to C 12E 6 water solutions and in this work we compare the results with those obtained from C 12E 8 water solutions. Differences are observed in the polyethyleneoxide (PEO) water composition at the interface for the two kinds of micellar aggregates. On increasing temperature to 40°C, C 12E 8 dehydrates with a faster rate than C 12E 6, but in this temperature range C 12E 8 retains a spherical shape, whereas C 12E 6, between 15°C and 20°C, undergoes the sphere–rod transition. In C 12E 8, at 40°C the PEO composition at the interface is close to the one expected for a complete dehydration. Above 40°C the degree of hydration increases with temperature and micellar growth occurs. The phase separation seems to require a specific interfacial composition, despite the number of PEO units per monomer of the suspended surfactant.
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