Friction of Single Polymers at Surfaces

Citations Over TimeTop 10% of 2006 papers

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 During the experiment, the AFM tip was retracted in- and off-plane which results, depending on the chosen conditions, in a desorption of the polymer from the surface, a sliding across the surface, or a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.

Related Papers

• → Dodecylamine collector — pH effect on mica flotation and correlation with thin aqueous foam film and surface force measurements(1996)49 cited
• → Interactions between layers of salivary acidic proline rich protein 1 (PRP 1) adsorbed on mica surfaces(2008)14 cited
• → Time Dependence of Interactions between a Surfactant-Coated Substrate and a Uniformly Charged Surface(2012)8 cited
• → Investigation of surface changes on mica induced by atomic force microscopy imaging under liquids(1997)9 cited
• ADHESION FORCES BETWEEN MICA SURFACES IN AIR AND LIQUIDS(1995)