Issue
EPL
Volume 79, Number 5, September 2007
Article Number 58004
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/79/58004
Published online 06 August 2007
EPL, 79 (2007) 58004
DOI: 10.1209/0295-5075/79/58004

Hydrodynamic lift of a moving nano-rod at a wall

C. Sendner and R. R. Netz

Physics Department, Technical University Munich - 85748 Garching, Germany


received 30 January 2007; accepted in final form 12 July 2007; published September 2007
published online 6 August 2007

Abstract
The hydrodynamic lift of a nano-rod that is pulled parallel to a wall is studied using hydrodynamic simulations and scaling arguments at finite temperature in the zero-Reynolds number limit. The no-slip wall gives rise to a hydrodynamic torque and partial rod orientation, which in turn induces a long-ranged hydrodynamic repulsion away from the wall. At high temperatures, the lift force depends quadratically on the pulling force and decays inversely with the square of the separation from the surface.

PACS
87.15.-v - Biomolecules: structure and physical properties .
47.15.G- - Low-Reynolds-number (creeping) flows .
83.10.Mj - Molecular dynamics, Brownian dynamics .

© Europhysics Letters Association 2007