Lukšič, M. and Hribar-Lee, B. and Buchner, Richard and Vlachy, V. (2009) Modelling fast mode dielectric relaxation of counterions in aqueous solutions of ionene bromides and fluorides. Physical Chemistry Chemical Physics 11 (43), pp. 10053-10058.
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The parameters derived from previously published dielec. spectra of aq. solns. of aliph. 3,3-, 4,5-, 6,6-, and 6,9-ionene bromides and fluorides were analyzed within the existing models for the fast counterion-relaxation process. By fitting the Poisson-Boltzmann results to the exptl. data for the osmotic coeffs. of the ionenes in question, we were able to est. the self-diffusion coeffs. of counterions. The coeffs. were then used to calc. the correlation lengths as proposed by the Ito model. The corresponding correlation lengths obtained by the Mandel-Manning model were of similar magnitude. The obsd. trends in correlation lengths were consistent with the model-independent values derived from the exptl. relaxation times. Combination of the dielec. data and Poisson-Boltzmann model anal. yields the conclusion that the fluoride counterions prefer longitudinal, whereas the bromide counterions favor transverse, fluctuation with respect to the polyelectrolyte backbone.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||dielec relaxation counterion aq soln ionene bromide fluoride|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||06 Jun 2012 13:39|
|Last Modified:||03 Jul 2012 11:50|