| Issue |
EPL
Volume 92, Number 3, November 2010
|
|
|---|---|---|
| Article Number | 38002 | |
| Number of page(s) | 6 | |
| Section | Interdisciplinary Physics and Related Areas of Science and Technology | |
| DOI | https://doi.org/10.1209/0295-5075/92/38002 | |
| Published online | 30 November 2010 | |
Single-polymer adsorption in shear: Flattening vs. hydrodynamic lift and surface potential corrugation effects
Physics Department, TU Munich - 85748 Garching, Germany, EU
Received:
29
July
2010
Accepted:
25
October
2010
The adsorption of a single polymer to a flat surface in shear is investigated using Brownian hydrodynamics simulations and scaling arguments. Competing effects are disentangled: in the absence of hydrodynamic interactions, shear drag flattens the chain and thus enhances adsorption. Hydrodynamic lift on the other hand gives rise to long-ranged repulsion from the surface which preempts the surface-adsorbed state via a discontinuous desorption transition, in agreement with theoretical arguments. Chain flattening is dominated by hydrodynamic lift, so overall, shear flow weakens the adsorption of flexible polymers. Surface friction due to small-wavelength surface potential corrugations is argued to weaken the surface attraction as well.
PACS: 82.35.Gh – Polymers on surfaces; adhesion / 83.50.-v – Deformation and flow / 82.37.Gk – STM and AFM manipulations of a single molecule
© EPLA, 2010
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