Geometry of surface mediated interactions

Details Geometry of surface mediated interactions Geometry of surface mediated interactions

2004-09-02

arxiv.org/abs/cond-mat/0409043v2

Europhys. Lett., 69 (3), pp. 482-488 (2005)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 2 figures, 1 table, Europhysics Letters style. New version corresponds to the one accepted by EPL. More explanations

Scientific paper

10.1209/epl/i2004-10368-1

Soft interfaces can mediate interactions between particles bound to them. The force transmitted through the surface geometry on a particle may be expressed as a closed line integral of the surface stress tensor around that particle. This contour may be deformed to exploit the symmetries present; for two identical particles, one obtains an exact expression for the force between them in terms of the local surface geometry of their mid-plane; in the case of a fluid membrane the sign of the interaction is often evident. The approach, by construction, is adapted directly to the surface and is independent of its parameterization. Furthermore, it is applicable for arbitrarily large deformations; in particular, it remains valid beyond the linear small-gradient regime.

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