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    Complexation between lignosulfonates and cationic surfactants and its influence on emulsion and foam stability

    Year: 1999

    Journal: Colloids and Surfaces
    A: Physicochemical and Engineering Aspects 159 (1999) 89-101, 20111221

    Authors: Kjell Magne Askvik , Stig Are Gundersen , Johan Sjöblom , Juha Merta , Per Stenius

    Organizations: a Department of Chemistry, University of Bergen, Allégaten 41, N- 5007 Bergen, Norway b Department of Forest Products Technology, Laboratory of Forest Products Technology, Helsinki University of Technology, FIN- 02015HUT Helsinki, Finland

    The association between sodium lignosulfonates and cationic as well as nonionic surfactants (quaternary ammonium bromides, cetylpyridinium chloride (CPC)) has been investigated by means of surface tension measurements, with additional information from measurements of viscosities and electrophoretic mobilities. A strong interaction is revealed between the lignosulfonate (LS) and micelles of the cationic surfactant, whereas no interaction is found in the case of a polyethyleneoxide-based nonionic surfactant. This is in agreement with the general behavior of polyelectrolyte-surfactant systems. LS as emulsifier in oil:water emulsions (o/w) gives rapid creaming into a highly concentrated emulsion, which is stable towards coalescence. The addition of cationic surfactant enhances the stability towards creaming. LS is a poor foaming agent, but the addition of cationic surfactant greatly improves the foam stability.