Sound attenuation, shear viscosity, and mutual diffusivity behavior in the nitroethane-cyclohexane critical mixture
2004 | journal article. A publication of Göttingen
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Sound attenuation, shear viscosity, and mutual diffusivity behavior in the nitroethane-cyclohexane critical mixture
Behrends, R.; Iwanowski, I.; Kosmowska, M.; Szala, A. & Kaatze, U. (2004)
The Journal of Chemical Physics, 121(12) pp. 5929-5934. DOI: https://doi.org/10.1063/1.1781614
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Details
- 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