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| - Interaction between a Hydrophobic Probe and Tri(ethylene glycol)-ContainingSelf-assembled Monolayers on Gold Studied with Force Spectroscopy in AqueousElectrolyte Solution
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| - Methoxy-tri(ethylene glycol)-terminated self-assembled monolayers of alkanethiols adsorbed on gold wereinvestigated by force spectroscopy with hydrophobic probes under electrolyte solution. Various ions fromthe Hofmeister series dissolved in the electrolyte, which are known to have different influence on waterstructure and to be able to react specifically with ethylene glycol based molecules, were employed in orderto test the hypothesis of a structured long-range (several nanometers) water interface and to elucidate thetype of (repulsive) force that is experienced by hydrophobic probes. This force is expected to play an importantrole in the resistance of these films to protein adsorption. Further analysis by photoelectron and massspectroscopic techniques was employed to test for a specific interaction between the ions and the organicfilm. Our experiments support the significance of an electrostatic component in the interaction betweenhydrophobic probes and the organic film and corroborate earlier studies.
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