Abstract
The influence of temperature and of added oil on the size and shape of micelles in the isotropic L 1 phase of the system pentaethyleneglycol-monododecylether (C 12E 5)+water+decane has been investigated by static and dynamic light scattering. The micellar growth as a function of the solute concentration was studied for oil-free aqueous solutions of C 12E 5 and for oil-containing micellar solutions at fixed mass fraction ( α=0.10) of the oil in the oil+surfactant mixture at three temperatures (13, 19 and 22°C). In the oil-free system, the mean molar mass of the wormlike micelles, M w, decreases as temperature is lowered at fixed concentration. This trend is enhanced in the oil-containing system ( α=0.10), and a transition from oil-swollen wormlike micelles to microemulsion droplets is observed when the temperature is lowered from 19 to 13°C. However, at 13°C the oil-swollen micelles are apparently not spherical, and droplet microemulsions that behave like a hard-sphere system are observed only when the oil-to-surfactant ratio is increased beyond α=0.10.
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