Relaxation of Shear-Induced Orientation and Textures in Semi-Dilute DNA Solutions.

ABSTRACT: Recent studies on semi-dilute Calf-Thymus DNA (CT-DNA) solutions have revealed the presence of birefringence and small-scale textures influenced by shear and ionic strength. In this study, we investigate these phenomena on the same solutions to elucidate the underlying shear-induced supramolecular organization and relaxation dynamics using rheo-birefringence, rheology, and rheo-SAXS (small-angle X-ray scattering). Static SAXS confirmed concentration-dependent inter-chain correlations in the 15-25 nm range, while rheology revealed a slipping yield-stress behavior. Oscillatory strain sweep and steady state rheo-birefringence experiments correlated the appearance of textures with the onset of flow and a stress plateau observed over a shear rate range from approximately 1 to 1000 s^-1

SUBMITTER: Lopez-Alvarez SE 

PROVIDER: S-EPMC12473322 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature