Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 96: Structure of Solid/Liquid Interfaces II
O 96.1: Vortrag
Freitag, 11. März 2016, 10:30–10:45, S052
Adsorption and desorption of water on protein-repelling self-assembled monolayers — •Mustafa Sayin1, Alexei Nefedov2, and Michael Zharnikov1 — 1Institute of Applied Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany — 2Institute of Functional Interfaces, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
We studied kinetics and thermodynamics of water adsorption and desorption as well as wetting and nucleation behaviors of water on a series of model organic surfaces, formed by oligo(ethylene glycol) substituted alkanethiolate (OEG-AT) self-assembled monolayers. The ultimate goal of the study was to get a better understanding of the mechanism behind the inertness of poly(ethylene glycol) and OEG based organic surfaces with respect to biofouling and protein adsorption. Varying the water coverage and the capability of surface hydration, by suitable design of the of the OEG-ATs molecules and respective self assembled monolayers, we monitored transfer from the hydration to wetting regime, distinguishing between the hydration and interfacial phases and deriving specifically their parameters. The bonding character of the hydration phase as well as the structure and morphology of the interfacial phase were investigated by high resolution X-ray photoelectron spectroscopy, in situ infrared reflection absorption spectroscopy, and near edge X-ray absorption fine structure spectroscopy. The kinetics of the water desorption was studied by thermodesorption spectroscopy.