Rheology of Semi-dilute Solutions of Calf-thymus DNA

Details Rheology of Semi-dilute Solutions of Calf-thymus DNA Rheology of Semi-dilute Solutions of Calf-thymus DNA

2000-12-25

arxiv.org/abs/cond-mat/0012461v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages inclusive of 7 eps figures

Scientific paper

We study the rheology of semi-dilute solutions of the sodium salt of calf-thymus DNA in the linear and nonlinear regimes. The frequency response data can be fitted very well to the hybrid model with two dominant relaxation times $\tau_{\circ}$ and $\tau_{1}$. The ratio $\frac{\tau_{\circ}}{\tau_{1}} \sim$ 5 is seen to be fairly constant on changing the temperature from 20$^{\circ}$C to 30$^{\circ}$C. The shear rate dependence of viscosity can be fitted to the Carreau model.

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