Supported Membranes on Chemically Structured and Rough Surfaces

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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21 pages, 7 ps figures, submitted to PRE

Scientific paper

10.1103/PhysRevE.63.051911

We present a general linear response description of membrane adhesion at rough or chemically structured surfaces. Our method accounts for non-local Van der Waals effects and contains the more approximate (and local) Deryagin approach in a simple limit. Specializing to supported membranes we consider the effects of substrate structure on the membrane adhesion energy and configuration. Adhesion is usually less favorable for rough substrates and the membrane shape tends to follow that of the surface contours. Chemical patterning, however, favors adhesion with the membrane configuration being out of phase with the surface structure. Finally, considering a surface indented with `V'-shaped trenches, we show that our approach is in fair agreement with an exact numerical solution.

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