Dielectric relaxation study of dipropylsulfoxide/water mixtures
| Autor: | L.S. Gabrielyan, Shiraz A. Markarian |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Sulfonyl
chemistry.chemical_classification Permittivity Range (particle radiation) Hydrogen bond Relaxation (NMR) Analytical chemistry Dielectric Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials symbols.namesake chemistry Materials Chemistry symbols Molecule Debye function Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Journal of Molecular Liquids. 162:135-140 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2011.06.016 |
| Popis: | The complex dielectric spectra of dipropylsulfoxide (DPSO)/water mixtures in the whole concentration range have been measured as a function of frequency between 100 MHz and 20 GHz at four temperatures between 298.15 K and 328.15 K. The dielectric parameters, static dielectric constant (es), relaxation time (τ) and relaxation strength (Δe) have been obtained by the least squares fit method. The relaxation in these mixtures can be described by two Debye functions, whereas for pure DPSO Cole-Davidson type is valid. The relaxation times of the mixtures show a maximum at about x(DPSO) ≈ 0.3. In the concentration range where a maximum appears, the interaction of DPSO with water is presumably the result of hydrogen bonding between water and the sulfonyl group of the sulfoxide molecule. The concentration and temperature dependent excess dielectric constant and effective Kirkwood correlation factor of the binary mixtures have been determined. The excess permittivity is found to be negative for all concentrations. |
| Databáze: | OpenAIRE |
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