Journal
SMALL
Volume 5, Issue 24, Pages 2864-2869Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200901237
Keywords
biocompatible materials; molecular devices; single-molecule spectroscopy; solvent effects; surface modification
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Funding
- Deutsche Forschungsgemeinschaft (DFG)
- Nanosystems Initiative Munich (NIM)
- Fond der Chemischen Industrie
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A method based on atomic force microscopy is used to delineate the properties that determine single-molecule adhesion onto solid substrates it? aqueous environment Hydrophobicity as well as electrical properties of the substrate and the polymer are varied. In addition, the influence of the solvent composition, in particular the effect of ions, on the molecular adhesion at the solid-liquid interface is studied. Surprisingly, the polymer and surface-related properties account for only small changes in adhesion force, while dissolved ions show a much larger effect. These results point towards the energy of solvation as the most important contribution to adhesion for a wide variety of polymers and substrate materials.
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