| Autor: |
Svetlana V. Patsaeva, Sergey A. Burikov, Sergey Dolenko, Alexander Efitorov, Tatiana A. Dolenko, Ivan V. Plastinin, Viktor I. Yuzhakov |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
The journal of physical chemistry. A. 119(44) |
| ISSN: |
1520-5215 |
| Popis: |
The structure of aqueous alcohol solutions at the molecular level for many decades has remained an intriguing topic in numerous theoretical and practical investigations. The aberrant thermodynamic properties of water-alcohol mixtures are believed to be caused by the differences in energy of hydrogen bonding between water-water, alcohol-alcohol, and alcohol-water molecules. We present the Raman scattering spectra of water, ethanol, and water-ethanol solutions with 20 and 70 vol % of ethanol thoroughly measured and analyzed at temperatures varying from -10 to +70 °C. Application of the MCR-ALS method allowed for each spectrum to extract contributions of molecules with different strengths of hydrogen bonding. The energy (enthalpy) of formation/weakening of hydrogen bonds was calculated using the slope of Van't Hoff plot. The energy of hydrogen bonding in 20 vol % of ethanol was found the highest among all the samples. This finding further supports appearance of clathrate-like structures in water-ethanol solutions with concentrations around 20 vol % of ethanol. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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