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'Dielectric relaxation' in keywords Facet   section ZfN Section A:Volume 055  [X]
Facet   Publication Year 2000  [X]
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1Author    S. A. Markarian, M. StockhausenRequires 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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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0667_n.pdf 
 Identifier    ZNA-2000-55a-0667_n 
 Volume    55 
2Author    R. Elsebrock, M. StockhausenRequires 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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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0629.pdf 
 Identifier    ZNA-2000-55a-0629 
 Volume    55 
3Author    Jan Jadżyn, Grzegorz Czechowski, Danuta BaumanRequires 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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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0810.pdf 
 Identifier    ZNA-2000-55a-0810 
 Volume    55