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Oligo(ethylene glycol) (OEG) SAMs are important tools in medical
applications to hinder the irreversible adsorption of proteins on
surfaces. They can be used to structure cells on surfaces or in
combination with specific headgroups as sensor elements. The aim of
this work was the in-situ characterization of hexa(ethylene glycol)
self-assembling monolayers (SAMs), their structural changes at
elevated temperatures and their longtime stability. The focus was
on the interaction of the thiol molecules with the surrounding
water molecules and the conformational and structural consequences.
A key to the understanding of the mechanism of protein resistance
is the ability of OEG-SAMs to bind water molecules at their surface
and in their interior. Infrared spectroscopy is a well suited
technique for the identification of molecules and their structural
changes due to the interaction with their environment. The surface
sensitive polarization modulation infrared reflection absorption
spectroscopy (PMIRRAS) technique enables in combination with a thin
liquid layer cell measurements under aqueous conditions (in-situ)
with a very high signal-to-noise ratio.
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