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Exploring The Transition From Wall Slip To Bulk Shearing Banding In Well-Entangled Dna Solutions, Shi-Qing Wang, Pouyan Boukany
Exploring The Transition From Wall Slip To Bulk Shearing Banding In Well-Entangled Dna Solutions, Shi-Qing Wang, Pouyan Boukany
Shi-Qing Wang
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 …