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Shear and longitudinal relaxation data are reported for aqueous solution of 23 mole % ethanol. Measurement of shear impedance in the temperature range +20 to −40 °C and frequency range 8.6–740 MHz indicates a composite spectra of double or triple relaxation. Longitudinal data are measured by Brillouin scattering and pulse techniques in a frequency range from 20 MHz to 6 GHz. Complicated processes involved are interpreted in terms of additive contributions to longitudinal moduli, comprising (1) structural viscoelastic relaxation of the spectra employed in shear data; (2) a relaxation of concentration fluctuation with a modified form of Romanov and Solovyev.
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Kōno et al. (1978) studied this question.
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