Critical behavior of 2,6-dimethylpyridine-water: measurements of specific heat, dynamic light scattering, and shear viscosity

The Journal of Chemical Physics
S Z MirzaevU Kaatze

Abstract

The specific heat C(p) at constant pressure, the shear viscosity eta(s), and the mutual diffusion coefficient D of the 2,6-dimethylpyridine-water mixture of critical composition have been measured in the homogeneous phase at various temperatures near the lower critical demixing temperature T(c). The amplitude of the fluctuation correlation length xi(0)=(0.198+/-0.004) nm has been derived from a combined evaluation of the eta(s) and D data. This value is in reasonable agreement with the one obtained from the amplitude A(+)=(0.26+/-0.01) J(g K) of the critical term in the specific heat, using the two-scale-factor universality relation. Within the limits of error the relaxation rate Gamma of order parameter fluctuations follows power law with the theoretical universal exponent and with the amplitude Gamma=(25+/-1)x10(9) s(-1). No indications of interferences of the critical fluctuations with other elementary chemical reactions have been found. A noteworthy result is the agreement of the background viscosity eta(b), resulting from the treatment of eta(s) and D data, with the viscosity eta(s)(nu=0) extrapolated from high-frequency viscosity data. The latter have been measured in the frequency range of 5-130 MHz using a novel shear i...Continue Reading

References

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Citations

Apr 30, 2008·Journal of Molecular Evolution·Damien C Mathew, Zaida Luthey-Schulten
Feb 12, 2015·The Journal of Chemical Physics·Sirojiddin Z Mirzaev, Udo Kaatze
Jul 11, 2016·The Journal of Chemical Physics·Faezeh PousanehAnna Maciołek
Nov 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Sirojiddin Z Mirzaev, Udo Kaatze
Sep 13, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Shuichi ToyouchiDirk-Peter Herten
Nov 14, 2015·Physical Review Letters·Sela Samin, René van Roij
Apr 10, 2017·The Journal of Chemical Physics·Edward ZorębskiUdo Kaatze
May 16, 2018·Physical Review. E·Sutapa RoyAnna Maciolek
Jan 15, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Sirojiddin Z MirzaevUdo Kaatze
Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·A GambassiS Dietrich
Aug 13, 2009·The Journal of Physical Chemistry. B·Tsuyoshi YamaguchiShinobu Koda
Jul 24, 2021·The Journal of Chemical Physics·H J JonasP G Bolhuis
Dec 10, 2016·The Journal of Physical Chemistry. B·Kamoladdin EgamberdievUdo Kaatze

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