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Dynamics and structure of biopolyelectrolytes in repulsion regime characterized by dielectric spectroscopy |
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| Authors: | S Tomić D Grgičin T Ivek T Vuletić S Dolanski Babić R Podgornik |
| Institution: | 1. Institut za fiziku, P.O. Box 304, HR-10001 Zagreb, Croatia;2. Department of Physics and Biophysics, Medical School, University of Zagreb, Zagreb, Croatia;3. Department of Physics, University of Ljubljana and J. Stefan Institute, Ljubljana, Slovenia;2. Advanced Separation Processes Group, Department of Chemical Engineering, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain |
| Abstract: | We overview the study of biopolyelectrolytes by dielectric spectroscopy technique by primarily focusing on the case of repulsive regime of intersegment interactions mediated by univalent counterions. Two observed dielectric relaxations in 100 Hz–100 MHz frequency range due to diffusive motion of counterions are related to polyelectrolyte structural properties: the high frequency mode probes the structural organization of the polyion network in solution, while the low frequency mode is correlated with single polyion conformational properties. Open issues are highlighted and prospects for further research with polyvalent counterions are designated in order to study the crossover from repulsive to attractive regime of intersegment interactions. |
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