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Structure and Hydration of Poly(ethylene oxide) Surfactants at the Air/Liquid Interface. A Vibrational Sum Frequency Spectroscopy Study

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    Structure and Hydration of Poly(ethylene oxide) Surfactants at the Air/Liquid Interface. A Vibrational Sum Frequency Spectroscopy Study
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    Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Drottning Kristinas Väg 51, SE-100 44 Stockholm, Sweden, YKI, Institute for Surface Chemistry, Stockholm, Sweden, and Division of Corrosion Science, Royal Institute of Technology, Drottning Kristinas Väg 51, SE-100 44 Stockholm, Sweden
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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2007, 111, 31, 11642–11652
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    https://doi.org/10.1021/jp070246r
    Published July 13, 2007
    Copyright © 2007 American Chemical Society
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    Abstract

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    Adsorption layers of penta(ethylene oxide) n-dodecyl ether (C12E5) at the air/liquid interface have been studied using the surface-sensitive technique vibrational sum frequency spectroscopy (VSFS). The CH and COC stretching vibrations of the surfactant molecule, as well as the OH stretching vibrations of the surface water molecules, have been targeted to obtain a comprehensive picture of the adsorption process. The concentration range studied comprises different adsorption regimes, starting from the neat water surface until attaining the saturated liquid expanded monolayer when approaching the critical micellar concentration (cmc). The surfactant molecules were found to first adsorb to the air−liquid interface with their hydrocarbon tails preferentially orientated close to the surface plane, surrounded by patches of unperturbed surface water. These patches were only seen to disappear at areas per molecule close to 65 Å2, coinciding with a sudden change in the orientation of the surfactant alkyl chains, which adopted a more upright configuration. Nonetheless, gauche defects in the hydrocarbon tails were observed along the whole concentration range, even above the cmc. Moreover, the poly(ethylene oxide) headgroup was seen to induce a significant structuring of the water molecules in direct proximity to the surfactant monolayer, despite being themselves substantially disordered. Comparison of the hydration fingerprint region is made with another non-ionic surfactant with a sugar-based headgroup. The temperature effect in the VSFS spectra of C12E4 and C12E8 solutions has also been considered, and the results are discussed in terms of the different models proposed to explain the peculiar temperature dependence of ethylene oxide-based surfactants and polymers in water.

    Copyright © 2007 American Chemical Society

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     Corresponding author. Fax:  +46 8 208998. E-mail:  [email protected].

    †

     Department of Chemistry, Royal Institute of Technology, and Institute for Surface Chemistry.

    ‡

     Division of Corrosion Science, Royal Institute of Technology.

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    Spectra showing the CH stretching region in detail. This material is available free of charge via the Internet at http://pubs.acs.org.

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    The Journal of Physical Chemistry C

    Cite this: J. Phys. Chem. C 2007, 111, 31, 11642–11652
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jp070246r
    Published July 13, 2007
    Copyright © 2007 American Chemical Society
    Request reuse permissions

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