Dynamics and Structure of Biopolyelectrolytes Characterized by Dielectric Spectroscopy

Structural properties of Na‐DNA and Na‐HA aqueous solutions can be quantified using dielectric spectroscopy in the frequency range 100 Hz–100 MHz. Two relaxation modes are typically detected that can be attributed to diffusive motion of polyion counterions. The overall study as a function of polyion...

Full description

Saved in:
Bibliographic Details
Published in:Macromolecular symposia. 2011-07, Vol.305 (1), p.43-54
Main Authors: Tomić, Silvia, Grgičin, Danijel, Ivek, Tomislav, Babić, Sanja Dolanski, Vuletić, Tomislav, Pabst, Georg, Podgornik, Rudi
Format: Article
Language:English
Subjects:
Aqueous solutions
biomaterials
dielectric properties
Dielectrics
Diffusion
Dynamics
dynamics and conformational changes
Flexibility
Frequency ranges
Polyelectrolytes
small-angle X-ray scattering (SAXS)
Spectroscopy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Structural properties of Na‐DNA and Na‐HA aqueous solutions can be quantified using dielectric spectroscopy in the frequency range 100 Hz–100 MHz. Two relaxation modes are typically detected that can be attributed to diffusive motion of polyion counterions. The overall study as a function of polyion length, concentration and added salt concentration demonstrates that the motion of polyion counterions detected at MHz frequencies probes collective properties, whereas the motion at kHz range probes single‐chain properties of polyelectrolytes. Fundamental length scales found to characterize the polyelectrolyte structure differ for the dilute and semidilute regime and also depend on the strength of electrostatic interactions and the flexibility. Characteristic length scales detected in the dielectric spectroscopy measurements compare well with the fundamental length scales predicted by theory and comply with those extracted from small‐angle X‐ray scattering.
ISSN:1022-1360
1521-3900
1521-3900
DOI:10.1002/masy.201000121