| | 1 | Author
| S. A. Markarian, M. Stockhausen | Requires cookie* | | | Title
| Dielectric Relaxation of Diethylsulfoxide  | | | | Abstract
| The dielectric loss spectrum of the title substance has been measured in its pure liquid state between 10 MHz and 72 GHz at 20°C. In comparison to the Debye function, it is slightly broadened towards the high frequency side. The maximum cor-responds to a relaxation time of 51 ps. In view of the molecu-lar size and viscosity, this is relatively long and thus indicative of associative intermolecular effects as in the case of the homol-ogous compound dimethylsulfoxide. | | | |
Reference
| Z. Naturforsch. 55a, 667—668 (2000); received April 25 2000 | | | |
Published
| 2000 | | | |
Keywords
| Association, Dielectric Relaxation, Liquids | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0667_n.pdf | | | | Identifier
| ZNA-2000-55a-0667_n | | | | Volume
| 55 | |
| 2 | Author
| R. Elsebrock, M. Stockhausen | Requires cookie* | | | Title
| Dielectric Spectroscopy of Solutions of Some Alkylammonium Salts in Chloroform and 1-Octanol | | | | Abstract
| Dielectric loss spectra between 1 MHz and 36 GHz have been measured at 20°C for solutions of hexadecyl trimethylammonium bromide and chloride, tetrahexylammonium bromide and tetrabutylam-monium bromide in chloroform and 1-octanol (three solutes per solvent) at moderate and high concen-trations. The discussion is aimed at identifying relaxation processes involving ions. Describing the relax -ational part of the spectra (after subtraction of the conductivity contribution) by a sum of spectral com-ponents, the lowest frequency component can be attributed to the solute in all cases. Its concentration dependence is indicative of two ionic relaxation processes differing in physical nature. The solvent is partly involved in those processes; moreover a structure breaking effect is likely to occur in case of the alcoholic solvent. The results are also discussed in comparison with a molten alkylammonium salt and with solutions of this and of inorganic salts. | | | |
Reference
| Z. Naturforsch. 55a, 629—636 (2000); received April 13 2000 | | | |
Published
| 2000 | | | |
Keywords
| Dielectric Relaxation, Electrolyte Solutions, Ionic Aggregation | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0629.pdf | | | | Identifier
| ZNA-2000-55a-0629 | | | | Volume
| 55 | |
| 3 | Author
| Jan Jadżyn, Grzegorz Czechowski, Danuta Bauman | Requires cookie* | | | Title
| Static and Dynamic Dielectric Polarization and Viscosity of AZ-Hexylcyanobiphenyl in the Isotropic and Nematic Phases | | | | Abstract
| On the basis of the temperature dependence of the static principal permittivities, £y and e x , measured for the nematic phase of «-hexylcyanobiphenyl (C 6 H 13 -Ph-Ph-C=N, 6CB), a value of the angle ß between the long molecular axis and the direction of the dipole moment /iof 6CB, as well as the order parameter S{T), were obtained by use of the Maier-Meier equations. From the dielectric relaxation and viscosity data, the contribution of the nematic potential to the molecular dynamics was estimated. In the isotropic phase the dielectric and viscosity data allow one, in the framework of the Debye model, to estimate the effective length of 6CB molecule. | | | |
Reference
| Z. Naturforsch. 55a, 810—816 (2000); received June 24 2000 | | | |
Published
| 2000 | | | |
Keywords
| Electric Permittivity, Dielectric Relaxation, Viscosity, 6CB | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0810.pdf | | | | Identifier
| ZNA-2000-55a-0810 | | | | Volume
| 55 | |
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