Adsorption of cationic amylopectin on microcrystalline cellulose.

H.G.M. van de Steeg, A. de Keizer, M.A. Cohen Stuart, B.H. Bijsterbosch

    Research output: Contribution to journalArticleAcademicpeer-review

    50 Citations (Scopus)

    Abstract

    The effects of electrolyte concentration and pH on the adsorption of cationic amylopectin on microcrystalline cellulose were investigated. The adsorbed amount in the pseudo-plateau of the isotherm showed a maximum as a function of the electrolyte concentration. We compared the data with a recent theory on polyelectrolyte adsorption. The increase in the adsorbed amount with pH was strongly correlated with the increase in surface charge, indicating the central role of electrostatic attraction between adsorbate and substrate. However, the maximum in the adsorption results from two additional effects: (i) a non-electrostatic attraction between polymer and surface and (ii) specific adsorption of counter-ions. The specificity of the latter adsorption increases in the order Cs > K ≈ Na > Li .
    Original languageEnglish
    Pages (from-to)77-89
    JournalColloids and Surfaces. A: Physicochemical and Engineering Aspects
    Volume70
    DOIs
    Publication statusPublished - 1993

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