Friction of single polymers at surfaces |
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Authors: | Kühner Ferdinand Erdmann Matthias Sonnenberg Lars Serr Andreas Morfill Julia Gaub Hermann E |
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Affiliation: | Chair for Applied Physics and Center for NanoScience, Ludwig Maximillians Universit?t, Munich, Germany. Ferdinand.Kuehner@lmu.de |
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Abstract: | Atomic force microscope (AFM) single molecule force spectroscopy has been used to investigate the friction coefficient of individual polymers adsorbed onto a solid support. The polymer chains were covalently attached to an AFM tip and were allowed to adsorb on a mica surface. Different polymers (ssDNA, polyallylamine) were chosen to cover a range of friction coefficients. During the experiment, the AFM tip was retracted in- and off-plane which results, depending on the chosen conditions, in a desorption of the polymer from the surface, a sliding across the surface, or a combination of both. Thus, the obtained force-extension spectra reveal detailed information on the mobility of a polymer chain on a surface under experimentally accessible conditions. This study demonstrates that absorbed polymers with comparable desorption forces may exhibit drastically different in plane mobility. |
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