Oscillatory packing and depletion of polyelectrolyte molecules at an oxide-water interface

Simon Biggs, Raymond R. Dagastine, Dennis C. Prieve

    Research output: Contribution to journalArticle

    47 Citations (Scopus)

    Abstract

    Total internal reflection microscopy (TIRM) has been used to study the interactions between a 5 μm borosilicate glass sphere and a silica slide in the presence of a nonadsorbing polyelectrolyte, sodium (polystyrene sulfonate) (NaPSS). The effect of the polymer concentration, within the dilute solution regime, on the observed interactions was investigated. In all cases, the interactions displayed a short-range electrostatic repulsion followed immediately, at larger separations, by a decaying oscillatory interaction that is attributed to structuring of the polyelectrolyte in solution. The periodicity of the oscillations, as a function of concentration, indicates that at large surface separations the polymer chains are ordered as a nonintermixing, space-filling, latex. At polymer concentrations of between 200 and 1000 ppm, a transition to a system of ordered rods, parallel to the interface was seen for the final layer of polymer molecules.

    Original languageEnglish
    Pages (from-to)11557-11564
    Number of pages8
    JournalJournal of Physical Chemistry B
    Volume106
    Issue number44
    DOIs
    Publication statusPublished - 7 Nov 2002

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