Molecular weight dependence of the depletion interaction between silica surfaces in solutions of sodium poly(styrene sulfonate)

Simon Biggs, Janine L. Burns, Yao De Yan, Graeme J. Jameson, Paul Jenkins

    Research output: Contribution to journalArticle

    48 Citations (Scopus)

    Abstract

    Direct measurements of the depletion interaction between silica surfaces immersed in solutions of sodium poly(styrene sulfonate) have been made with the atomic force microscope, using the colloid probe technique. Significant variations in the interaction forces as a function of both the polymer molecular weight and the probe radius were observed. The depletion interaction yielded a secondary minimum in the observed force-distance profiles. This minimum was observed to increase in depth as a function of both the polymer molecular weight and the polymer concentration. The magnitude of the measured depletion interaction did not increase as much as expected when the size of the colloid probe was increased. The importance of surface asperities and local radii of curvature with respect to force measurements are discussed.

    Original languageEnglish
    Pages (from-to)9242-9248
    Number of pages7
    JournalLangmuir
    Volume16
    Issue number24
    DOIs
    Publication statusPublished - 28 Nov 2000

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