title: Raman Spectroscopy of Water-Ethanol Solutions: The Estimation of Hydrogen Bonding Energy and the Appearance of Clathrate-like Structures in Solutions.
abstract: 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.
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Dolenko
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Burikov
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Dolenko
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Alexander O
authors.initials: AO
authors.lastname: Efitorov
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Ivan V
authors.initials: IV
authors.lastname: Plastinin
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Viktor I
authors.initials: VI
authors.lastname: Yuzhakov
authors.affiliation: Department of Physics and ‡D. V. Skobeltsyn Institute of Nuclear Physics, M. V. Lomonosov Moscow State University , Moscow 119991, Russia.
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Patsaeva