Local entropic effects of polymers grafted to soft interfaces

Details Local entropic effects of polymers grafted to soft interfaces Local entropic effects of polymers grafted to soft interfaces

2000-06-06

arxiv.org/abs/cond-mat/0006082v1

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 9 figures

Scientific paper

10.1007/s101890170140

In this paper, we study the equilibrium properties of polymer chains end-tethered to a fluid membrane. The loss of conformational entropy of the polymer results in an inhomogeneous pressure field that we calculate for gaussian chains. We estimate the effects of excluded volume through a relation between pressure and concentration. Under the polymer pressure, a soft surface will deform. We calculate the deformation profile for a fluid membrane and show that close to the grafting point, this profile assumes a cone-like shape, independently of the boundary conditions. Interactions between different polymers are also mediated by the membrane deformation. This pair-additive potential is attractive for chains grafted on the same side of the membrane and repulsive otherwise.

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