Dynamic scaling of the critical binary mixture methanol-hexane

The Journal of Chemical Physics
I IwanowskiU Kaatze

Abstract

Acoustical attenuation spectrometry, dynamic light scattering, shear viscosity, density, and heat capacity measurements of the methanol/n-hexane mixture of critical composition have been performed. The critical part in the sonic attenuation coefficients nicely fits to the empirical scaling function of the Bhattacharjee-Ferrell [Phys. Rev. A 24, 1643 (1981)] dynamic scaling model if the theoretically predicted scaled half-attenuation frequency Omega(12) (BF)=2.1 is used. The relaxation rates of order parameter fluctuations, as resulting from the acoustical spectra, within the limits of experimental error agree with those from a combined evaluation of the light scattering and shear viscosity measurements. Both series of data display power law with amplitude Gamma(0)=44x10(9) s(-1). The amplitude of the fluctuation correlation length follows as xi(0)=0.33 nm from the light scattering data and as xi(0)=0.32 nm from the amplitude of the singular part of the heat capacity if the two-scale factor universality relation is used. The adiabatic coupling constant g=0.11 results from the amplitude of the critical contribution to the acoustical spectrum near the critical point, in conformity with g=0.12 as following from the variation of the...Continue Reading

References

Mar 1, 1985·Physical Review A: General Physics·R A Ferrell, J K Bhattacharjee
Jan 5, 2002·Ultrasonics·U KaatzeK Lautscham
Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·R F BergG A Zimmerli
Oct 9, 2002·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·C A CerdeiriñaL Romaní

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Citations

Aug 22, 2008·The Journal of Chemical Physics·I IwanowskiU Kaatze
Aug 16, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·I IwanowskiU Kaatze
Sep 13, 2014·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·John J HegsethDaniel Beysens
Jan 26, 2007·The Journal of Physical Chemistry. B·I Iwanowski, U Kaatze

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