Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Organic-Inorganic Hybrid Systems and Organic Films
O 45.8: Poster
Dienstag, 21. März 2017, 18:30–20:30, P1A
Adsorption and desorption of water on oligo(ethylene glycol) substituted alkanethiolate monolayers — •Mustafa Sayin1, Alexei Nefedov2, and Michael Zharnikov1 — 1Applied Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany — 2Institute of Functional Interfaces, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
We studied kinetics and thermodynamics of the 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 protein adsorption and biofouling. The kinetic and thermodynamic parameters were studied by thermal desorption spectroscopy. Two adsorbate phases with different parameters and behavior were observed, viz. the interfacial and hydration phase. 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 and near edge X-ray absorption fine structure spectroscopy.