Arrangements of cationic starch of varying hydrophobicity on hydrophilic and hydrophobic surfaces

Katri S. Kontturi (Corresponding Author), Susanna Holappa, Eero Kontturi, Leena-Sisko Johansson, Sari Hyvärinen, Soili Peltonen, Janne Laine

    Research output: Contribution to journalArticleScientificpeer-review

    11 Citations (Scopus)


    Arrangements of cationic starches hydrophobized by acetylation (CS-acet) deposited from aqueous electrolyte solutions onto hydrophilized and hydrophobized silica surfaces were investigated by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and contact angle measurements. The influence of electrolyte composition, acetylation degree of cationic starch (DSACET), and deposition method was examined. On a hydrophobic substrate, CS-acet formed an open film with structure strongly dependent on DSACET and electrolyte composition of the solution. On a hydrophilic substrate, acetylation increased the hydrophobicity of the film when the starch was deposited by adsorbing. When deposition was made by spin coating, i.e., the CS-acet was forced onto the substrate, the hydrophobic tuning by acetylation was lost. The films deposited by spin coating were thicker and considerably rougher than those deposited by adsorbing.

    Original languageEnglish
    Pages (from-to)21 - 29
    Number of pages9
    JournalJournal of Colloid and Interface Science
    Issue number1
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed


    • hydrophobized cationic starch
    • model surfaces
    • film deposition


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