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Relaxation phenomena in critical microemulsion systems |
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| Authors: | L Letamendia E Louisor E Pru-Lestret J Rouch F Sciortino P Tartaglia and H Ushiki |
| Institution: | a Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux, 1351 Cours de la Libération, 333405 Talence, France b Dipartimento di Fisica, Università di Roma La Sapienza and Istituto Nazzionale di Fisica della Materia, Unita di Roma La Sapienza, Piazale Aldo Moro 2, I-00185 Rome, Italy c Laboratory of Tranport and Transformation in Bio-systems Department of Biomechanics and Intelligent Systems, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu-shi, Tokyo 183, Japan |
| Abstract: | We discuss extensive sets of experimental data including static and dynamic light scattering, ultrasonic velocity measurements and high and low frequency dielectric relaxation, taken in the vicinity the critical point of a ternary microemulsion system. Upon approaching the critical point we observed a slowing down of the dielectric relaxation time and of the first cumulant of the time-dependent droplet density correlation function C2(t) which shows a non-exponential behavior at long time. These features can be well acccounted for by assuming that the microemulsion system is made of polydispersed transient fractal aggregates having a fractal dimension df=2.5 and a polydispersity index τ=2.2. |
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