Binary phase diagram of monolayers of simple 1,2-diol derivatives

C. De Wolf, F. Bringezu, G. Brezesinski, H. Möhwald, P.B. Howes, K. Kjær

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The miscibility properties of monolayers of two 1,2-diol derivatives, 1-palmitoylglycerol (1) and 1-hexadecylglycerol (2), have been studied at the air-water interface using grazing incidence X-ray diffraction (GIXD). While, at all pressures investigated, compound (I) exhibits only a NN-tilted rectangular structure, compound (2) has a phase transition to a NNN-tilted rectangular lattice at 18 mN/m. This transition pressure increases linearly with increasing proportion of compound (1). At the transition we observe a sudden increase in the long axis of the unit cell which is now the new tilt direction. Extrapolation of a plot of 1/cos(t) versus lateral pressure yields transition pressures to a phase with upright oriented molecules. Both pure compounds and all mixtures investigated show a non-zero lattice distortion at zero tilt angle indicating a probable herringbone packing of the molecules. A phase diagram is presented for the mixture of (1) and (2). (C) 1998 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    JournalPhysica B: Condensed Matter
    Volume248
    Pages (from-to)199-203
    ISSN0921-4526
    DOIs
    Publication statusPublished - 1998

    Fingerprint Dive into the research topics of 'Binary phase diagram of monolayers of simple 1,2-diol derivatives'. Together they form a unique fingerprint.

    Cite this