On the mobility of extended bodies in viscous films and membranes

Details On the mobility of extended bodies in viscous films and membranes On the mobility of extended bodies in viscous films and membranes

2003-03-05

arxiv.org/abs/cond-mat/0303095v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 11 figures

Scientific paper

10.1103/PhysRevE.69.021503

We develop general methods to calculate the mobilities of extended bodies in (or associated with) membranes and films. We demonstrate a striking difference between in-plane motion of rod-like inclusions and the corresponding case of bulk (three-dimensional) fluids: for rotations and motion perpendicular to the rod axis, we find purely local drag, in which the drag coefficient is purely algebraic in the rod dimensions. These results, as well as the calculational methods are applicable to such problems as the diffusion of objects in or associated with Langmuir films and lipid membranes. The methods can also be simply extended to treat viscoelastic systems.

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