Volume 62, Number 1, April 2003
|Page(s)||124 - 130|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 March 2003|
Membrane pinning on a disordered substrate
LPSB/NICHD, Bld. 12A Rm. 2041,
National Institutes of Health Bethesda, MD 20892-5626, USA
2 Department of Physics, Faculty of Mathematics and Physics University of Ljubljana - SI-1000 Ljubljana, Slovenia and Department of Theoretical Physics, J. Stefan Institute - SI-1000 Ljubljana, Slovenia
3 MEMPHYS - Center for Biomembrane Physics, Department of Chemistry University of Southern Denmark - Campusvej 55, DK-5230 Odense M, Denmark
Accepted: 30 January 2003
We investigate interactions between an elastic membrane and a substrate characterized by quenched positional disorder in the height function. We show that the positional disorder transforms the standard secondary DLVO minimum into two separate states: the hovering state characterized by a planar membrane at a finite separation from the interface and a pinned state where the membrane follows closely the asperities of the substrate and is, as a consequence, quite corrugated. The transition between the two states is continuous and depends on the parameters of the underlying DLVO potential as well as the parameters describing the quenched height-height correlation function of the substrate.
PACS: 87.16.Dg – Membranes, bilayers, and vesicles / 68.15.+e – Liquid thin films
© EDP Sciences, 2003
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