Thermodynamic Properties of Crystalline Cellulose Allomorphs Studied with Dispersion-Corrected Density Functional Methods
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-10
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Mcode
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Language
en
Pages
11
Series
Molecules, Volume 27, issue 19
Abstract
The phonon properties and thermodynamics of four crystalline cellulose allomorphs, I (Formula presented.), I (Formula presented.), II, and III (Formula presented.), have been investigated using dispersion-corrected density functional theory (DFT). In line with experimental findings, the free energy differences between the studied cellulose allomorphs are small, less than 1 kJ/mol per atom. The calculated specific heat at constant volume ((Formula presented.)) has been compared with the available experimental data in the temperature range 10–300 K. Quasiharmonic approximation has been employed to study thermodynamics and specific heat at constant pressure ((Formula presented.)). For the studied temperature range of 10–400 K, the specific heat of all cellulose allomorphs shows very similar behavior. The calculated and experimental specific heat agree well at low temperatures below 100 K, but the deviation between theory and experiment increases with temperature. This may be due to increasing phonon anharmonicity as the temperature increases.Description
Publisher Copyright: © 2022 by the authors.
Keywords
cellulose, density functional theory, phonon properties, quantum chemical calculations, quasiharmonic approximation, thermodynamics
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Citation
Srivastava , D , Ahopelto , J & Karttunen , A J 2022 , ' Thermodynamic Properties of Crystalline Cellulose Allomorphs Studied with Dispersion-Corrected Density Functional Methods ' , Molecules , vol. 27 , no. 19 , 6240 . https://doi.org/10.3390/molecules27196240