Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water
In view of getting a quantitative picture of the dynamics in mixtures of hydrogen-bonded liquids, in particular the ternary water-ethanol-octanol, we examine in this paper the dynamics of two binary systems: ethanol-water and ethanol-octanol. Our multiscale investigation includes quasi-elastic neutr...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2022-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2022/16/epjconf_qens-wins2022_01003.pdf |
| _version_ | 1811308847173730304 |
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| author | Hoffmann Ingo Malayil Kalathil Firoz Lopian Tobias Touraud Didier Czakkel Orsolya Plazanet Marie Alba-Simionesco Christiane |
| author_facet | Hoffmann Ingo Malayil Kalathil Firoz Lopian Tobias Touraud Didier Czakkel Orsolya Plazanet Marie Alba-Simionesco Christiane |
| author_sort | Hoffmann Ingo |
| collection | DOAJ |
| description | In view of getting a quantitative picture of the dynamics in mixtures of hydrogen-bonded liquids, in particular the ternary water-ethanol-octanol, we examine in this paper the dynamics of two binary systems: ethanol-water and ethanol-octanol. Our multiscale investigation includes quasi-elastic neutron scattering for the characterization of the dynamics at the molecular scale, completed by NMR at the mesoscopic scale and eventually compared with macroscopic viscosity properties. We highlight the decrease of diffusivity in pure alcohols when increasing the lengthscale and conjecture its relation with the two processes measured in dielectric spectroscopy. While the behaviour of ethanol-water is well understood, unexpected inversion of the slowest component between the micro and the mesoscale are evidenced in the ethanol-octanol mixture. This effect could be at the origin of the negative viscosity excess in the mixture of alcohols. |
| first_indexed | 2024-04-13T09:31:37Z |
| format | Article |
| id | doaj.art-e0b41f5500fe4aad8cc30a34de317156 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-04-13T09:31:37Z |
| publishDate | 2022-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-e0b41f5500fe4aad8cc30a34de3171562022-12-22T02:52:15ZengEDP SciencesEPJ Web of Conferences2100-014X2022-01-012720100310.1051/epjconf/202227201003epjconf_qens-wins2022_01003Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-waterHoffmann Ingo0Malayil Kalathil Firoz1Lopian Tobias2Touraud Didier3Czakkel Orsolya4Plazanet Marie5Alba-Simionesco Christiane6Institut Laue-LangevinInstitut Laue-LangevinInstitut Laue-LangevinInstitute of Physical and Theoretical Chemistry, University RegensburgInstitut Laue-LangevinLaboratoire Interdisciplinaire de Physique, CNRS and Univ. Grenoble-AlpesLaboratoire Leon Brillouin, Paris-Saclay University. CEA, CNRSIn view of getting a quantitative picture of the dynamics in mixtures of hydrogen-bonded liquids, in particular the ternary water-ethanol-octanol, we examine in this paper the dynamics of two binary systems: ethanol-water and ethanol-octanol. Our multiscale investigation includes quasi-elastic neutron scattering for the characterization of the dynamics at the molecular scale, completed by NMR at the mesoscopic scale and eventually compared with macroscopic viscosity properties. We highlight the decrease of diffusivity in pure alcohols when increasing the lengthscale and conjecture its relation with the two processes measured in dielectric spectroscopy. While the behaviour of ethanol-water is well understood, unexpected inversion of the slowest component between the micro and the mesoscale are evidenced in the ethanol-octanol mixture. This effect could be at the origin of the negative viscosity excess in the mixture of alcohols.https://www.epj-conferences.org/articles/epjconf/pdf/2022/16/epjconf_qens-wins2022_01003.pdf |
| spellingShingle | Hoffmann Ingo Malayil Kalathil Firoz Lopian Tobias Touraud Didier Czakkel Orsolya Plazanet Marie Alba-Simionesco Christiane Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water EPJ Web of Conferences |
| title | Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water |
| title_full | Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water |
| title_fullStr | Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water |
| title_full_unstemmed | Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water |
| title_short | Unexpected molecular dynamics of ethanol in hydrogen-bonded binary mixtures, ethanol-octanol and ethanol-water |
| title_sort | unexpected molecular dynamics of ethanol in hydrogen bonded binary mixtures ethanol octanol and ethanol water |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2022/16/epjconf_qens-wins2022_01003.pdf |
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