Sound attenuation, shear viscosity, and mutual diffusivity behavior in the nitroethane-cyclohexane critical mixture

2004 | journal article. A publication with affiliation to the University of Göttingen.

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​Behrends, R., Iwanowski, I., Kosmowska, M., Szala, A. & Kaatze, U. (2004). ​Sound attenuation, shear viscosity, and mutual diffusivity behavior in the nitroethane-cyclohexane critical mixture. The Journal of Chemical Physics121(12), ​5929​-5934​. ​doi: https://doi.org/10.1063/1.1781614 

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Authors
Behrends, Ralph; Iwanowski, Ireneusz; Kosmowska, M.; Szala, A.; Kaatze, Udo
Abstract
The shear viscosity eta(s), mutual diffusion coefficient D, and ultrasonic attenuation spectra of the nitroethane-cyclohexane mixture of critical composition have been measured at various temperatures near the critical temperature T-c. The relaxation rate of order parameter fluctuations resulting from a combined evaluation of the eta(s) and D data follows power law behavior with the theoretical exponent and with the large amplitude Gamma(o)=(156+/-2)x10(9) s(-1). The ultrasonic spectra have been evaluated in terms of a critical contribution and a noncritical background contribution. The amplitude of the former exhibits a temperature dependence, in conformity with a temperature dependence in the adiabatic coupling constant (\g\=0.064 near T-c and 0.1 at T-T-c=3 K). If the variation of the critical amplitude with T is taken into account the experimental attenuation coefficient data display a scaling function which nicely fits to the theoretical prediction from the Bhattacharjee-Ferrell dynamic scaling model [R. A. Ferrell and J. K. Bhattacharjee, Phys. Rev. A 31, 1788 (1985)]. (C) 2004 American Institute of Physics.
Issue Date
2004
Status
published
Publisher
Amer Inst Physics
Journal
The Journal of Chemical Physics 
ISSN
0021-9606

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