Local entropic effects of polymers grafted to soft interfaces |
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Authors: | T Bickel C Jeppesen CM Marques |
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Institution: | (1) L.D.F.C.-UMR 7506, 3 rue de l'Université, 67084 Strasbourg Cedex, France, FR;(2) Materials Research Laboratory, University of California, Santa Barbara, CA 93106, USA, US |
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Abstract: | 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.
Received 20 April 2000 |
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Keywords: | PACS 36 20 -r Macromolecules and polymer molecules - 87 15 He Dynamics and conformational changes - 87 16 Dg Membranes bilayers and vesicles |
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