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CPP: Chemische Physik und Polymerphysik
CPP 28: Biological Systems
CPP 28.5: Vortrag
Freitag, 31. März 2006, 11:30–11:45, ZEU Lich
In-situ Studies of Protein Resistance of Oligo(Ethylene Glycol) Self-Assembled Monolayers — •Maximilian Skoda1,2, Frank Schreiber1, James Willis2, Robert Jacobs2, Reiner Dahint3, Michael Grunze3, and Maximilian Wolff4 — 1Universität Tübingen — 2Oxford University — 3Universität Heidelberg — 4Institut Laue-Langevin
The structure of the interface between organic matter, such as self-assembled monolayers (SAMs), and water is currently subject of intensive studies due to its importance for the understanding of surface-solvent and surface-surface interactions [1,2]. We report results from Polarisation Modulated (PM) Fourier Transform Infrared Spectroscopy (FTIR) studies that enable us to address the local interaction of water with OEG groups. Our data suggest a rather strong interaction of water molecules with the EG section of the SAM, potentially the penetration of water into the SAM. We will also discuss the potential of true in-situ investigations (i.e. under a layer of water) using PM-FTIR. In addition, we will discuss neutron reflectivity (NR) measurements on the same system. NR provides insight to the structure of the solid-liquid interface in-situ and without perturbation of the system. The measurements reveal changes in the structure of water and the protein solution in the vicinity of the SAM upon changes in temperature.
[1] F. Schreiber, J. Phys.: Cond. Matter 16 (2004) R881
[2] D. Schwendel et al., Langmuir 19 (2003) 2284