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Rupture of molecular thin films observed in atomic force microscopy. II. Experiment

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Sun,  Gexiao
MPI for Polymer Research, Max Planck Society;

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Butt,  Hans-Jürgen
MPI for Polymer Research, Max Planck Society;

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Citation

Loi, S., Sun, G., Franz, V., & Butt, H.-J. (2002). Rupture of molecular thin films observed in atomic force microscopy. II. Experiment. Physical Review E, 66(3): 031602. doi:10.1103/PhysRevE.66.031602.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-6523-1
Abstract
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).