Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model
The glass transition temperature of trehalose, sucrose, glucose, and fructose aqueous solutions has been predicted as a function of the water content by using the free volume/percolation model (FVPM). This model only requires the molar volume of water in the liquid and supercooled regimes, the molar...
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paper:paper_15206106_v120_n22_p5047_Constantin2023-06-08T16:19:10Z Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model Corti, Horacio Roberto Biocatalysts Free volume Fructose Glass Glucose Image segmentation Liquid sugar Liquids Mixtures Solutions Specific heat Sugar (sucrose) Sugars Supercooling Temperature Temperature distribution Thermal expansion Volume measurement Gordon-Taylor model Heat capacity change High density liquid waters Low temperatures Structure of liquids Supercooled regions Temperature dependence Thermal expansion coefficients Glass transition The glass transition temperature of trehalose, sucrose, glucose, and fructose aqueous solutions has been predicted as a function of the water content by using the free volume/percolation model (FVPM). This model only requires the molar volume of water in the liquid and supercooled regimes, the molar volumes of the hypothetical pure liquid sugars at temperatures below their pure glass transition temperatures, and the molar volumes of the mixtures at the glass transition temperature. The model is simplified by assuming that the excess thermal expansion coefficient is negligible for saccharide-water mixtures, and this ideal FVPM becomes identical to the Gordon-Taylor model. It was found that the behavior of the water molar volume in trehalose-water mixtures at low temperatures can be obtained by assuming that the FVPM holds for this mixture. The temperature dependence of the water molar volume in the supercooled region of interest seems to be compatible with the recent hypothesis on the existence of two structure of liquid water, being the high density liquid water the state of water in the sugar solutions. The idealized FVPM describes the measured glass transition temperature of sucrose, glucose, and fructose aqueous solutions, with much better accuracy than both the Gordon-Taylor model based on an empirical kGT constant dependent on the saccharide glass transition temperature and the Couchman-Karasz model using experimental heat capacity changes of the components at the glass transition temperature. Thus, FVPM seems to be an excellent tool to predict the glass transition temperature of other aqueous saccharides and polyols solutions by resorting to volumetric information easily available. © 2016 American Chemical Society. Fil:Corti, H.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v120_n22_p5047_Constantin http://hdl.handle.net/20.500.12110/paper_15206106_v120_n22_p5047_Constantin |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Biocatalysts Free volume Fructose Glass Glucose Image segmentation Liquid sugar Liquids Mixtures Solutions Specific heat Sugar (sucrose) Sugars Supercooling Temperature Temperature distribution Thermal expansion Volume measurement Gordon-Taylor model Heat capacity change High density liquid waters Low temperatures Structure of liquids Supercooled regions Temperature dependence Thermal expansion coefficients Glass transition |
| spellingShingle |
Biocatalysts Free volume Fructose Glass Glucose Image segmentation Liquid sugar Liquids Mixtures Solutions Specific heat Sugar (sucrose) Sugars Supercooling Temperature Temperature distribution Thermal expansion Volume measurement Gordon-Taylor model Heat capacity change High density liquid waters Low temperatures Structure of liquids Supercooled regions Temperature dependence Thermal expansion coefficients Glass transition Corti, Horacio Roberto Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model |
| topic_facet |
Biocatalysts Free volume Fructose Glass Glucose Image segmentation Liquid sugar Liquids Mixtures Solutions Specific heat Sugar (sucrose) Sugars Supercooling Temperature Temperature distribution Thermal expansion Volume measurement Gordon-Taylor model Heat capacity change High density liquid waters Low temperatures Structure of liquids Supercooled regions Temperature dependence Thermal expansion coefficients Glass transition |
| description |
The glass transition temperature of trehalose, sucrose, glucose, and fructose aqueous solutions has been predicted as a function of the water content by using the free volume/percolation model (FVPM). This model only requires the molar volume of water in the liquid and supercooled regimes, the molar volumes of the hypothetical pure liquid sugars at temperatures below their pure glass transition temperatures, and the molar volumes of the mixtures at the glass transition temperature. The model is simplified by assuming that the excess thermal expansion coefficient is negligible for saccharide-water mixtures, and this ideal FVPM becomes identical to the Gordon-Taylor model. It was found that the behavior of the water molar volume in trehalose-water mixtures at low temperatures can be obtained by assuming that the FVPM holds for this mixture. The temperature dependence of the water molar volume in the supercooled region of interest seems to be compatible with the recent hypothesis on the existence of two structure of liquid water, being the high density liquid water the state of water in the sugar solutions. The idealized FVPM describes the measured glass transition temperature of sucrose, glucose, and fructose aqueous solutions, with much better accuracy than both the Gordon-Taylor model based on an empirical kGT constant dependent on the saccharide glass transition temperature and the Couchman-Karasz model using experimental heat capacity changes of the components at the glass transition temperature. Thus, FVPM seems to be an excellent tool to predict the glass transition temperature of other aqueous saccharides and polyols solutions by resorting to volumetric information easily available. © 2016 American Chemical Society. |
| author |
Corti, Horacio Roberto |
| author_facet |
Corti, Horacio Roberto |
| author_sort |
Corti, Horacio Roberto |
| title |
Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model |
| title_short |
Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model |
| title_full |
Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model |
| title_fullStr |
Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model |
| title_full_unstemmed |
Glass Transition Temperature of Saccharide Aqueous Solutions Estimated with the Free Volume/Percolation Model |
| title_sort |
glass transition temperature of saccharide aqueous solutions estimated with the free volume/percolation model |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v120_n22_p5047_Constantin http://hdl.handle.net/20.500.12110/paper_15206106_v120_n22_p5047_Constantin |
| work_keys_str_mv |
AT cortihoracioroberto glasstransitiontemperatureofsaccharideaqueoussolutionsestimatedwiththefreevolumepercolationmodel |
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1768545991354482688 |