Crystalline Self-Aggregation and a Pressure Driven Solid-Solid Phase Transition in a Fluorinated Langmuir Monolayer

D. Jacquemain, S. Grayer Wolf, F. Leveiller, M. Lahav, L. Leiserowitz, M. Deutsch, K. Kjær, J. Als-Nielsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Monolayers of PFA, a fluorinated surfactant, on water were studied using synchrotron X-ray grazing incidence diffraction (GID) and reflectivity measurements (XR). The uncompressed monolayer is found to self-assemble into crystalline domains giving a strong GID peak. Upon compression and decompression a surface pressure driven solid-solid phase transition takes place.

    A hexagonal lattice with vertical molecules at high pressure undergoes a distortion due to a rigid molecular tilt as the pressure is decreased. Bragg rod scans provide conclusive evidence for a tilt of about 20° at 10 nM/m and show the tilt to be towards nearest neighbours. The uncompressed monolayer has a molecular tilt of about 25°.
    Original languageEnglish
    JournalJournal de physique. Colloque
    Volume50
    Issue numberC7
    Pages (from-to)29-37
    ISSN0449-1947
    DOIs
    Publication statusPublished - 1989

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