NDLI: High-Frequency Shear Viscosity of Low-Viscosity Liquids

Content Provider	Springer Nature Link
Author	Kaatze, U. Behrends, R.
Copyright Year	2014
Abstract	A thickness shear quartz resonator technique is described to measure the shear viscosity of low-viscosity liquids in the frequency range from 6 MHz to 130 MHz. Examples of shear-viscosity spectra in that frequency range are presented to show that various molecular processes are accompanied by shear-viscosity relaxation. Among these processes are conformational variations of alkyl chains, with relaxation times $$\tau _{\eta }$$ of about 0.3 ns for $$n$$ -pentadecane and $$n$$ -hexadecane at 25 $$^{\circ }$$ C. These variations can be well represented in terms of a torsional oscillator model. Also featured briefly are shear-viscosity relaxations associated with fluctuations of hydrogen-bonded clusters in alcohols, for which $$\tau _{\eta }$$ values between 0.3 ns ( $$n$$ -hexanol) and 1.5 ns ( $$n$$ -dodecanol) have been found at 25 $$^{\circ }$$ C. In addition, the special suitability of high-frequency shear-viscosity spectroscopy to the study of critically demixing mixtures is demonstrated by some illustrative examples. Due to slowing, critical fluctuations do not contribute to the shear viscosity at sufficiently high frequencies of measurements so that the non-critical background viscosity $$\eta _\mathrm{bg}$$ of critical systems can be directly determined from high-frequency shear-viscosity spectroscopy. Relaxations in $$\eta _\mathrm{bg}$$ appear also in the shear-viscosity spectra with, for example, $$\tau _{\eta }\,\approx $$ 2 ns for the critical triethylamine–water binary mixture at temperatures between 10 $$^{\circ }$$ C and 18 $$^{\circ }$$ C. Such relaxations noticeably influence the relaxation rate of order parameter fluctuations. They may be also the reason for the need of a special mesoscopic viscosity when mutual diffusion coefficients of critical polymer solutions are discussed in terms of mode-coupling theory.
Starting Page	2088
Ending Page	2106
Page Count	19
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	35
Issue Number	11
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2014-08-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Conformational variations Critical demixing Hydrogen network variations Liquid spectroscopy Shear-viscosity relaxation Condensed Matter Physics Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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