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Stretched-exponential relaxation of electric birefringence in complex liquids

1990; IOP Publishing; Volume: 2; Issue: S Linguagem: Inglês

10.1088/0953-8984/2/s/007

1361-648X

Vittorio Degiorgio, Roberto Piazza, Francesco Mantegazza, Tommaso Bellini,

Thermodynamic properties of mixtures

The relaxation of electric birefringence is experimentally investigated in three distinct systems: critical binary mixtures, polydisperse micellar solutions and dilute polyelectrolyte solutions. The asymptotic behaviour is shown to be consistent with a stretched-exponential form exp(-(t/ tau )alpha ). Most of the data are quantitatively explained by a simple model of parallel relaxation of many independent processes characterized by a wide distribution of sizes.