Surface rheology of spread monolayers

M. R. Buhaenko*, J. W. Goodwin, R. M. Richardson

*Corresponding author for this work

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

    27 Citations (Scopus)

    Abstract

    Two methods of investigating the surface rheological properties of spread monolayers are presented. Surface shear relaxation is capable of giving the relaxation spectrum over a wide range of frequencies but will only give a rough estimate of the strain. Surface resonance rheometry was used at a fixed frequency but with an accurately defined strain. Results are presented for monolayers of several materials and the effects of subphase pH, ions and temperature have been obtained and are discussed. Of particular significance to the Langmuir-Blodgett process is the discovery of a viscosity limit above which monolayer deposition is not successful. The viscosity of a monolayer can be controlled by adjusting the pH of the subphase (particularly if there are subphase divalent ions present) and we have used this control successfully to deposit a copper-containing docosanoic acid film.

    Original languageEnglish
    Pages (from-to)171-189
    Number of pages19
    JournalThin Solid Films
    Volume159
    Issue number1-2
    DOIs
    Publication statusPublished - 1 Jan 1988

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