Issue |
EPL
Volume 80, Number 1, October 2007
|
|
---|---|---|
Article Number | 18001 | |
Number of page(s) | 6 | |
Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
DOI | https://doi.org/10.1209/0295-5075/80/18001 | |
Published online | 07 September 2007 |
Surface-enhanced unfolding of collapsed polymers in shear flow
1
Physics Department, TU Munich - D-85748 Garching, Germany
2
Laboratoire Matière Molle & Chimie, ESPCI, CNRS, UMR 7167 - 10 rue Vauquelin, 75005 Paris, France
Received:
14
June
2007
Accepted:
14
August
2007
Using hydrodynamic simulations we study the shear-induced unfolding of a collapsed polymer near a planar wall. Above a well-defined threshold shear rate , the globule becomes unstable and displays stretching-refolding events. With decreasing distance from the surface, the critical shear rate
goes down, which is rationalized within a scaling analysis in terms of increased hydrodynamic stress due to a surface-induced slowing-down of globule rotation and translation. Our results are relevant for protein-assisted blood clotting in capillary vessels.
PACS: 87.15.-v – Biomolecules: structure and physical properties / 82.37.-j – Single molecule kinetics
© Europhysics Letters Association, 2007
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