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Polymers 2018, 10(8), 926; https://doi.org/10.3390/polym10080926

Hydrodynamic Shear Effects on Grafted and Non-Grafted Collapsed Polymers

Department of Physics, Freie Universität Berlin, 14195 Berlin, Germany
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Received: 11 July 2018 / Revised: 8 August 2018 / Accepted: 9 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Polymer Dynamics)
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Abstract

We study collapsed homo-polymeric molecules under linear shear flow conditions using hydrodynamic Brownian dynamics simulations. Tensile force profiles and the shear-rate-dependent globular-coil transition for grafted and non-grafted chains are investigated to shine light on the different unfolding mechanisms. The scaling of the critical shear rate, at which the globular-coil transition takes place, with the monomer number is inverse for the grafted and non-grafted scenarios. This implicates that for the grafted scenario, larger chains have a decreased critical shear rate, while for the non-grafted scenario higher shear rates are needed in order to unfold larger chains. Protrusions govern the unfolding transition of non-grafted polymers, while for grafted polymers, the maximal tension appears at the grafted end. View Full-Text
Keywords: shear flow; Brownian dynamics simulation; hydrodynamic interactions; von Willebrand factor shear flow; Brownian dynamics simulation; hydrodynamic interactions; von Willebrand factor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Schwarzl, R.; Netz, R.R. Hydrodynamic Shear Effects on Grafted and Non-Grafted Collapsed Polymers. Polymers 2018, 10, 926.

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