N2 - Using high-resolution confocal rheometry, we study the shear profiles of well-entangled DNA solutions under large-amplitude oscillatory shear in a rectilinear planar shear cell. T1 - Shear-banding and superdiffusivity in entangled polymer solutions The probability distribution functions of particle displacements follow a power-law scaling at large displacements, indicating a L 2017 American Physical Society.", Surprisingly, tracer particles in the shear frame exhibit transient superdiffusivity and strong dynamic heterogeneity. To investigate the microscopic origin of the observed shear banding, we study the dynamics of micron-sized tracers embedded in DNA solutions. With increasing Weissenberg number (Wi), we observe successive transitions from normal Newtonian linear shear profiles to wall-slip dominant shear profiles and, finally, to shear-banding profiles at high Wi. DMR-1420013).Ībstract = "Using high-resolution confocal rheometry, we study the shear profiles of well-entangled DNA solutions under large-amplitude oscillatory shear in a rectilinear planar shear cell. Portions of this work were performed in UMN Nanofabrication Center, which receives a partial support from NSF National Nanotechnology Infrastructure Network and the UMN College of Science and Engineering Polymer Characterization Facility, which receives capital equipment funding from the NSF through the UMN MRSEC program (Grant No. The work was supported by NSF CBET-1700771. acknowledges financial support from the Kwanjeong Educational Foundation. Agrawal for preparing the etched silicon wafer. We hypothesize that the unusual particle dynamics arise from localized shear-induced chain disentanglement. We further characterize the length and time scales associated with the abnormal dynamics of tracer particles. The probability distribution functions of particle displacements follow a power-law scaling at large displacements, indicating a Lévy-walk-type motion, reminiscent of tracer dynamics in entangled wormlike micelle solutions and sheared colloidal glasses. Using high-resolution confocal rheometry, we study the shear profiles of well-entangled DNA solutions under large-amplitude oscillatory shear in a rectilinear planar shear cell.
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