Translational and rotational friction on a colloidal rod near a wall

Details Translational and rotational friction on a colloidal rod near a wall Translational and rotational friction on a colloidal rod near a wall

2009-11-17

arxiv.org/abs/0911.3388v2

Journal of Chemical Physics 132, 054511 (2010)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 8 figures

Scientific paper

10.1063/1.3308649

We present particulate simulation results for translational and rotational friction components of a shish-kebab model of a colloidal rod with aspect ratio (length over diameter) $L/D = 10$ in the presence of a planar hard wall. Hydrodynamic interactions between rod and wall cause an overall enhancement of the friction tensor components. We find that the friction enhancements to reasonable approximation scale inversely linear with the closest distance $d$ between the rod surface and the wall, for $d$ in the range between $D/8$ and $L$. The dependence of the wall-induced friction on the angle $\theta$ between the long axis of the rod and the normal to the wall is studied and fitted with simple polynomials in $\cos \theta$.

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