Preparation and properties of starch-based colloidal microgels

Y. Dziechciarek, J.J.G. van Soest, A.P. Philipse

    Research output: Contribution to journalArticleAcademicpeer-review

    28 Citations (Scopus)

    Abstract

    Novel starch microgels were prepared by emulsion cross-linking and characterized with respect to shape, volume, and mass density. Starch microgels appear to be negatively charged (similar to-50 mV), with a particle size varying as a function of the type of cross-linker (ca. 0.25-10 mum). Environmental scanning electron microscopy observations show a dependence of the particle swelling on the cross-linking density. Viscosimetry reveals that starch microgels behave as charged polymers, where the reduced viscosity increases with dilution (anomalous viscosity behavior) for sufficiently low kappaa (ca. kappaa < 3), the ratio of the particle radius (a), and the Debye length (kappa(-1)). Analogous results are obtained for reference-charged rigid silica spheres, which approach the hard sphere limit for increasing ionic strengths. The shape of the microgels appears to play a minor role in the anomalous viscosity behavior, which is more likely dominated by electrostatic effects. (C) 2002 Elsevier Science.
    Original languageEnglish
    Pages (from-to)48-59
    JournalJournal of Colloid and Interface Science
    Volume246
    Issue number1
    DOIs
    Publication statusPublished - 2002

    Keywords

    • Starch microgels
    • Charged silica spheres
    • Environmental scanning electron microscopy
    • Ionic strength
    • Intrinsic viscosity
    • Starch colloids

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