The relaxation of electronic birefringence has been measured in a polydisperse solution of rodlike ionic micelles of cetylpyridinium chloride. The asymptotic behaviour of the relaxation is found to be characterized by a stretched-exponential: R(t)Š≈Šexp [−(t/τ)α]. The value of the exponent α is 0.25 in the dilute regime. As the concentration of rods exceeds the critical concentration for entanglement c*, α grows progressively reaching the value 0.5. A simple theoretical model is presented to explain the dilute-regime results. © 1989 IOP Publishing Ltd.
Bellini, T., Mantegazza, F., Piazza, R., Degiorgio, V. (1989). Stretched-Exponential Relaxation of Electric Birefringence in a Polydisperse Colloidal Solution. EUROPHYSICS LETTERS, 10(5), 499-503 [10.1209/0295-5075/10/5/019].
Stretched-Exponential Relaxation of Electric Birefringence in a Polydisperse Colloidal Solution
MANTEGAZZA, FRANCESCO;
1989
Abstract
The relaxation of electronic birefringence has been measured in a polydisperse solution of rodlike ionic micelles of cetylpyridinium chloride. The asymptotic behaviour of the relaxation is found to be characterized by a stretched-exponential: R(t)Š≈Šexp [−(t/τ)α]. The value of the exponent α is 0.25 in the dilute regime. As the concentration of rods exceeds the critical concentration for entanglement c*, α grows progressively reaching the value 0.5. A simple theoretical model is presented to explain the dilute-regime results. © 1989 IOP Publishing Ltd.
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