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

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    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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    Amylopectins
    Amylopectin
    cellulose
    Cellulose
    Adsorption
    adsorption
    Electrolytes
    attraction
    electrolytes
    Radiation counters
    Adsorbates
    Surface charge
    Polyelectrolytes
    Isotherms
    Electrostatics
    plateaus
    Polymers
    isotherms
    counters
    microcrystalline cellulose

    Cite this

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    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 .",
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    Adsorption of cationic amylopectin on microcrystalline cellulose. / van de Steeg, H.G.M.; de Keizer, A.; Cohen Stuart, M.A.; Bijsterbosch, B.H.

    In: Colloids and Surfaces. A: Physicochemical and Engineering Aspects, Vol. 70, 1993, p. 77-89.

    Research output: Contribution to journalArticleAcademicpeer-review

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    T1 - Adsorption of cationic amylopectin on microcrystalline cellulose.

    AU - van de Steeg, H.G.M.

    AU - de Keizer, A.

    AU - Cohen Stuart, M.A.

    AU - Bijsterbosch, B.H.

    PY - 1993

    Y1 - 1993

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    AB - 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 .

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    M3 - Article

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