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  • Title: Hydration of oligo(ethylene glycol) self-assembled monolayers studied using polarization modulation infrared spectroscopy.
    Author: Skoda MW, Jacobs RM, Willis J, Schreiber F.
    Journal: Langmuir; 2007 Jan 30; 23(3):970-4. PubMed ID: 17240997.
    Abstract:
    The interaction with water of protein-resistant monolayers (SAMs), self-assembled from (triethylene glycol) terminated thiol HS(CH2)11(OCH2CH2)3OMe solutions, was studied using in and ex situ polarization-modulated Fourier transform infrared spectroscopy. In particular, shifts in the position of the characteristic C-O-C stretching vibration were observed after the monolayers had been exposed to water. The shift in frequency increased when the SAM was observed in direct contact with a thin layer of water. It was found that the magnitude of the shift also depended on the surface coverage of the SAM. These findings suggest a rather strong interaction of oligo(ethylene glycol) SAMs with water and indicate the penetration of water into the upper region of the monolayer.
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