The viscosity of glycerol-water mixtures including the supercooled region

The dynamic viscosity of water, glycerol, and its mixtures over a wide range of temperatures, including the supercooled region, was calculated resorting to several predictive approaches and compared to published data. The temperature dependence of the viscosity of the pure components can be describe...

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Autores principales: Trejo González, J.A., Longinotti, M.P., Corti, H.R.
Formato: JOUR
Materias:
Adjustable parameters
Arrhenius equation
Best fit
Composition dependence
Dynamic viscosities
Empirical equations
Experimental data
Experimental errors
Glycerol-water mixtures
Low temperatures
Pure components
Stable liquids
Supercooled regions
Temperature dependence
Glass transition
Glycerol
Mixtures
Sugar (sucrose)
Supercooling
Viscometers
Viscosity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00219568_v56_n4_p1397_TrejoGonzalez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00219568_v56_n4_p1397_TrejoGonzalez
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spelling todo:paper_00219568_v56_n4_p1397_TrejoGonzalez2023-10-03T14:23:40Z The viscosity of glycerol-water mixtures including the supercooled region Trejo González, J.A. Longinotti, M.P. Corti, H.R. Adjustable parameters Arrhenius equation Best fit Composition dependence Dynamic viscosities Empirical equations Experimental data Experimental errors Glycerol-water mixtures Low temperatures Pure components Stable liquids Supercooled regions Temperature dependence Glass transition Glycerol Mixtures Sugar (sucrose) Supercooling Viscometers Viscosity The dynamic viscosity of water, glycerol, and its mixtures over a wide range of temperatures, including the supercooled region, was calculated resorting to several predictive approaches and compared to published data. The temperature dependence of the viscosity of the pure components can be described within the experimental error using different empirical equations. However, the best fit is obtained by the Avramov-Milchev equation, taking into account that this equation has only two adjustable parameters. The same model was also used to describe the viscosity of the mixtures over the entire range of temperatures and compositions where experimental data are available and to extrapolate the viscosities of the mixtures at temperatures close to the glass transition. We calculated the viscosities of glycerol-water mixtures, over the entire range of compositions, between (238.15 and 273.15) K. The agreement with experimental data in the stable liquid region is very good, which makes our predictions in the supercooled region fairly reliable. The analysis of the glycerol-water mixtures reveals that, in contrast to that previously found in other aqueous polyol solutions such as sucrose and trehalose, the temperature and composition dependence of the viscosity cannot be described with a scaled Arrhenius equation. At low temperatures, the excess viscosity of the glycerol-water mixtures can be very well described by a regular-like solution coefficient. © 2011 American Chemical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00219568_v56_n4_p1397_TrejoGonzalez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Adjustable parameters
Arrhenius equation
Best fit
Composition dependence
Dynamic viscosities
Empirical equations
Experimental data
Experimental errors
Glycerol-water mixtures
Low temperatures
Pure components
Stable liquids
Supercooled regions
Temperature dependence
Glass transition
Glycerol
Mixtures
Sugar (sucrose)
Supercooling
Viscometers
Viscosity
spellingShingle Adjustable parameters
Arrhenius equation
Best fit
Composition dependence
Dynamic viscosities
Empirical equations
Experimental data
Experimental errors
Glycerol-water mixtures
Low temperatures
Pure components
Stable liquids
Supercooled regions
Temperature dependence
Glass transition
Glycerol
Mixtures
Sugar (sucrose)
Supercooling
Viscometers
Viscosity
Trejo González, J.A.
Longinotti, M.P.
Corti, H.R.
The viscosity of glycerol-water mixtures including the supercooled region
topic_facet Adjustable parameters
Arrhenius equation
Best fit
Composition dependence
Dynamic viscosities
Empirical equations
Experimental data
Experimental errors
Glycerol-water mixtures
Low temperatures
Pure components
Stable liquids
Supercooled regions
Temperature dependence
Glass transition
Glycerol
Mixtures
Sugar (sucrose)
Supercooling
Viscometers
Viscosity
description The dynamic viscosity of water, glycerol, and its mixtures over a wide range of temperatures, including the supercooled region, was calculated resorting to several predictive approaches and compared to published data. The temperature dependence of the viscosity of the pure components can be described within the experimental error using different empirical equations. However, the best fit is obtained by the Avramov-Milchev equation, taking into account that this equation has only two adjustable parameters. The same model was also used to describe the viscosity of the mixtures over the entire range of temperatures and compositions where experimental data are available and to extrapolate the viscosities of the mixtures at temperatures close to the glass transition. We calculated the viscosities of glycerol-water mixtures, over the entire range of compositions, between (238.15 and 273.15) K. The agreement with experimental data in the stable liquid region is very good, which makes our predictions in the supercooled region fairly reliable. The analysis of the glycerol-water mixtures reveals that, in contrast to that previously found in other aqueous polyol solutions such as sucrose and trehalose, the temperature and composition dependence of the viscosity cannot be described with a scaled Arrhenius equation. At low temperatures, the excess viscosity of the glycerol-water mixtures can be very well described by a regular-like solution coefficient. © 2011 American Chemical Society.
format JOUR
author Trejo González, J.A.
Longinotti, M.P.
Corti, H.R.
author_facet Trejo González, J.A.
Longinotti, M.P.
Corti, H.R.
author_sort Trejo González, J.A.
title The viscosity of glycerol-water mixtures including the supercooled region
title_short The viscosity of glycerol-water mixtures including the supercooled region
title_full The viscosity of glycerol-water mixtures including the supercooled region
title_fullStr The viscosity of glycerol-water mixtures including the supercooled region
title_full_unstemmed The viscosity of glycerol-water mixtures including the supercooled region
title_sort viscosity of glycerol-water mixtures including the supercooled region
url http://hdl.handle.net/20.500.12110/paper_00219568_v56_n4_p1397_TrejoGonzalez
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