Rates of Phase Transformations between Mesophases Formed by a Non-Ionic Surfactant in Water: a Time-Resolved X-Ray Diffraction Study

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Abstract
We studied the hexagonal/cubic and cubic/lamellar phase transitions of the C 12EO 6/water binary system initiated by a millisecond infrared laser temperature-jump. The temporal evolution of the structural changes were recorded using synchrotron X-ray diffraction with 50 ms time-resolution. The time constants of both phase transitions vary from seconds to less than 100 ms, according to the initial temperature prior to the T-jump and to the power of the IR laser. The intensity of the X-ray reflections is related to the volume fractions of both phases during a phase transformation. An interpretation of the results in the framework of a nucleation and growth mechanism is given

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