Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry
Using a customized time-domain ellipsometer operating in the THz range, the molecular dynamics of a liquid binary solution based on water and isopropyl alcohol (2-propanol) is investigated. The setup is capable of detecting small changes in the optical properties of the mixture within a single measu...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/4/2292 |
| _version_ | 1797618224575021056 |
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| author | Zahra Mazaheri Gian Paolo Papari Antonello Andreone |
| author_facet | Zahra Mazaheri Gian Paolo Papari Antonello Andreone |
| author_sort | Zahra Mazaheri |
| collection | DOAJ |
| description | Using a customized time-domain ellipsometer operating in the THz range, the molecular dynamics of a liquid binary solution based on water and isopropyl alcohol (2-propanol) is investigated. The setup is capable of detecting small changes in the optical properties of the mixture within a single measurement. The complex dielectric response of samples with different concentrations is studied through the direct measurement of the ellipsometric parameters. The results are described using an effective Debye model, from which the relaxation parameters associated with different activation energies can be consistently extracted. Significant deviations between experimental data and the theoretical expectations at an intermediate volume percentage of 2-propanol in water are observed and interpreted as produced by competing effects: the creation/destruction of hydrogen bonding on the one hand, and the presence of cluster/aggregation between water and alcohol molecules on the other. |
| first_indexed | 2024-03-11T08:10:08Z |
| format | Article |
| id | doaj.art-afd2a0d7978246ee98dd831921942f6f |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-11T08:10:08Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-afd2a0d7978246ee98dd831921942f6f2023-11-16T23:12:50ZengMDPI AGSensors1424-82202023-02-01234229210.3390/s23042292Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain EllipsometryZahra Mazaheri0Gian Paolo Papari1Antonello Andreone2Department of Physics “E. Pancini”, University of Naples Federico II, 80126 Naples, ItalyDepartment of Physics “E. Pancini”, University of Naples Federico II, 80126 Naples, ItalyDepartment of Physics “E. Pancini”, University of Naples Federico II, 80126 Naples, ItalyUsing a customized time-domain ellipsometer operating in the THz range, the molecular dynamics of a liquid binary solution based on water and isopropyl alcohol (2-propanol) is investigated. The setup is capable of detecting small changes in the optical properties of the mixture within a single measurement. The complex dielectric response of samples with different concentrations is studied through the direct measurement of the ellipsometric parameters. The results are described using an effective Debye model, from which the relaxation parameters associated with different activation energies can be consistently extracted. Significant deviations between experimental data and the theoretical expectations at an intermediate volume percentage of 2-propanol in water are observed and interpreted as produced by competing effects: the creation/destruction of hydrogen bonding on the one hand, and the presence of cluster/aggregation between water and alcohol molecules on the other.https://www.mdpi.com/1424-8220/23/4/2292THz sensingellipsometrywater solutionshydrogen bonding |
| spellingShingle | Zahra Mazaheri Gian Paolo Papari Antonello Andreone Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry Sensors THz sensing ellipsometry water solutions hydrogen bonding |
| title | Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry |
| title_full | Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry |
| title_fullStr | Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry |
| title_full_unstemmed | Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry |
| title_short | Probing the Molecular Dynamics of Aqueous Binary Solutions with THz Time-Domain Ellipsometry |
| title_sort | probing the molecular dynamics of aqueous binary solutions with thz time domain ellipsometry |
| topic | THz sensing ellipsometry water solutions hydrogen bonding |
| url | https://www.mdpi.com/1424-8220/23/4/2292 |
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