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Relaxation of electric birefringence near a critical consolute point

1994; American Physical Society; Volume: 49; Issue: 4 Linguagem: Inglês

10.1103/physreve.49.3093

1538-4519

Sylwester J. Rzoska, Vittorio Degiorgio, Tommaso Bellini, Roberto Piazza,

Material Dynamics and Properties

An experimental investigation of the relaxation of electric birefringence in the critical binary mixture n-butylbenzene-propylene carbonate is presented. The decay functions observed at different temperatures in the critical region are clearly nonexponential and show a scaling behavior. The experimental relaxation function is compared with theoretical predictions: the asymptotic decay is a stretched exponential with a stretch exponent 0.40\ifmmode\pm\else\textpm\fi{}0.03, in good agreement with the dynamic droplet model, but the earlier stages are very well described also by the Onuki-Doi approach [Europhys. Lett. 17, 63 (1992)].