X-ray reflectivity from insoluble monolayers spread on aqueous subphases

R. M. Richardson, S. J. Roser

    Research output: Contribution to journalArticle (Academic Journal)peer-review

    74 Citations (Scopus)


    The technique of X-ray reflection is used to study the structure of an insoluble monolayer spread on an aqueous subphase. The feasibility of the technique as a non-invasive structural probe for liquid surfaces is demonstrated. A comparison of the X-ray reflectivity from docosanoic acid spread on 2.5 × 10−4molar solutions of caesium chloride, cadmium chloride and lanthanum chloride shows that practically all of the cadmium and lanthanium ions are within 15 Å of the acid head groups whereas there is no evidence for such binding with caesium. The pH dependence of the amount of bound cadmium is used to show that a pK value of 5.35 ± 0.05 describes the conversion from acid to cadmium soap.

    Original languageEnglish
    Pages (from-to)797-814
    Number of pages18
    JournalLiquid Crystals
    Issue number6
    Publication statusPublished - 1 Jan 1987


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