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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 28588.0, MPI für Polymerforschung / MPI Polymerforschung
Rupture of molecular thin films observed in atomic force microscopy. II. Experiment
Authors:Loi, S.; Sun, G.; Franz, V.; Butt, Hans-Jürgen
Language:English
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Physical Review E
Journal Abbrev.:Phys. Rev. E
Volume:66
Issue / Number:3
Start Page:031602
End Page:031602
Sequence Number of Article:031602
Review Status:No review
Audience:Not Specified
Abstract / Description:In atomic force microscope studies of thin films often a defined jump of the tip through the film is observed once a certain threshold force has been exceeded. In particular, on lipid bilayers this is regularly observed. In a previous paper [H.-J. Butt and V. Franz, Phys. Rev. E 66, 031601 (2002)] we presented two complementary models to describe film rupture. The aim of this study was to verify these models. Experiments were done with solid supported bilayers consisting of dioleoyloxypropyl-trimethylammonium chloride (DOTAP) and dioleoylphosphatidylserine (DOPS) in aqueous solutions and with propanol. Both models describe experimental results adequately. In particular, a narrow distribution of yield forces and an increase of the mean yield force with increasing loading rate is correctly predicted. For the lipid bilayers spreading pressures of roughly 20 mN/m (DOTAP) and 5 mN/m (DOPS) were measured. Line tensions for the edge of a lipid bilayer ranged between 3 (DOTAP) and 6 pN (DOPS).
Comment of the Author/Creator:Date: 2002, SEP
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Siegen, D-57068 Siegen, Germany
Identifiers:ISI:000178623300037 [ID No:1]
ISSN:1063-651X [ID No:2]
LOCALID:P-02-167
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