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Issue 4, 2009
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Exploring the transition from wall slip to bulk shearing banding in well-entangled DNA solutions

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Abstract

In this study we have carried out a combination of rheometric and particle-tracking velocimetric (PTV) measurements to investigate nonlinear rheological behavior of three entangled DNA solutions (with ca. 150 entanglements per chain) and, in particular, to explore a transformation from slip-dominated steady-state flow to bulk shear inhomogeneity. In the stress plateau regime, an elastic recoil-like response occurs transiently at either interfaces or sample interior after stress overshoot during a startup shear. In both startup shear and creep mode, wall slip, bulk shear banding or a combination of both have been observed in both transient and steady states. The water-based solution shows massive wall slip allowing the bulk to remain in the Newtonian flow regime. Use of glycerol as a solvent can effectively reduce interfacial slip, permitting bulk shear banding to develop in both controlled-rate and controlled-stress modes. For the glycerol based solution, a sufficiently high Weissenberg number can attain in the rheometer where PTV observations reveal homogenous shear in steady state.

Graphical abstract: Exploring the transition from wall slip to bulk shearing banding in well-entangled DNA solutions

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Publication details

The article was received on 20 Mar 2008, accepted on 17 Oct 2008 and first published on 15 Dec 2008


Article type: Paper
DOI: 10.1039/B804791J
Citation: Soft Matter, 2009,5, 780-789
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    Exploring the transition from wall slip to bulk shearing banding in well-entangled DNA solutions

    P. E. Boukany and S. Wang, Soft Matter, 2009, 5, 780
    DOI: 10.1039/B804791J

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