X-ray grazing incidence studies of the 2D crystallization of monolayers of 1-alcohols at the air water interface

J.F. Legrand, A. Renault, O. Konovalov, E. Chevigny, J. Als-Nielsen, G. Grübel, B. Berge

    Research output: Contribution to journalJournal article

    Abstract

    A new undulator producing an X-ray beam of high brilliance has been used at the European Synchrotron Radiation Facility (ESRF, Beamline-9, Troika) for investigating the structure of two-dimensional crystals of 1-tetradecanol, 1-dodecanol, 1-decanol and 1-nonanol. These fatty alcohols with relatively short chains crystallize in a hexagonal structure akin to that of alkanes in the Rotator II phase. The high flux obtained under grazing incidence conditions has permitted a detailed investigation to be made of the in-plane (Q(x)) and out-of-plane (Q(z)) diffraction from the monolayers. When approaching the 2D melting temperature the diffracted intensity decreases, and this pre-melting effect, which is more pronounced for the shorter chains, is attributed to a critical increase of the Debye-Waller factor. In addition, the Bragg rod profiles along Q(z) show that, in the hexagonal structure, the chain molecules do not remain perfectly perpendicular to the water surface.
    Original languageEnglish
    JournalThin Solid Films
    Volume248
    Issue number1
    Pages (from-to)95-99
    ISSN0040-6090
    DOIs
    Publication statusPublished - 1994

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