Fluctuation induced attraction between adhesion sites of supported membranes

Details Fluctuation induced attraction between adhesion sites of supported membranes Fluctuation induced attraction between adhesion sites of supported membranes

2010-03-07

arxiv.org/abs/1003.1459v1

Phys. Rev. E 81, 050902(R) (2010)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We use scaling arguments and coarse grained Monte Carlo simulations to study the fluctuation mediated interactions between a pair of adhesion sites of a bilayer membrane and a supporting surface. We find that the potential of mean force is an infinitely long range attractive potential that grows logarithmically with the pair distance $r$: $\phi(\vec{r})/k_BT=c\ln r$, where the constant $c=2$ and $c=1$ for non-stressed and stressed membranes, respectively. When, in addition to excluded volume repulsion, the membrane also interacts with the underlying surface through a height-dependent attractive potential, the potential $\phi(\vec{r})$ is screened at large pair distances.

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