Abstract
Absorption (5–300 MHz and velocity (5–65 MHz) of ultrasound, density, and viscosity have been measured in highly concentrated aqueous solutions of sodium deoxycholate at 20 °C. Ultrasonic results show that classical viscous losses represent a large fraction of the experimental ones and that a small velocity dispersion is present. These experimental findings are interpreted on the grounds of a viscoelastic behavior of these solutions. Accordingly, the contributions from both volume and shear viscosity relaxation processes have been evaluated. For the former process a previously suggeted model of associated reactions is considered while the dynamic shear viscosity is related to the flexibility of the large micellar super aggregates.
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