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Model Glycol-Terminated Surfaces For Adhesion Resistance

Mathilde I. Béthencourt, D. Barriet, Nathalie M. Frangi, T. Randall Lee
Published 2005 · Materials Science

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ABSTRACT This manuscript introduces a new family of cyclic acetal-terminated alkanethiols used to prepare self-assembled monolayers (SAMs) on gold. The new SAMs, which are designed as variants of the biocompatible protein-repellant surfaces generated from thin films of oligoethylene glycol (OEG) or polyethylene glycol (PEG), were characterized by ellipsometry, contact-angle goniometry, and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). A preliminary study of protein adhesion was also performed using fibrinogen as a model protein. The interfacial structure and properties of the new SAMs were compared with those generated from OEG-terminated alkanethiols and from surface-grafted PEG, which have been described previously. The data show that the new adsorbates form well packed and conformationally ordered films with contact angles of water ranging from 67° to 95°, depending on the precise structure of the acetal terminus. As a whole, the new SAMs offer a unique strategy for studying and designing adhesion-resistant biocompatible inferfaces.
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