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    Bi-layer formation of imidazole-modified ethyl(hydroxyethyl)cellulose at a hydrophobic surface as monitored by QCM-D

    Year: 2009

    Journal: Journal of Colloid and Interface Science, Volume 336, Issue 2, 15 August 2009, Pages 388-392, 20100827

    Authors: Hedin J. 1, Isaksson D. 1, Andersson M. 1, Nydén M. 1

    Last authors: Magnus Nydéna

    Organizations: aDepartment of Chemical and Biological Engineering, Applied Surface Chemistry, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

    Country: Sweden

    The adsorption behaviour of ethyl(hydroxyethyl)cellulose chemically modified with imidazole (Im-EHEC) at hydrophobic surfaces has been studied with QCM -D. The very slow adsorption isotherm was due to a continuous polymer film reconfiguration and exchange of different sized polymers. The thickness of the film was about 30 nm. The polymers adsorbed Cu2+ ions into the film from a CuCl2 solution and a bi-layer was formed when Im-EHEC was added a second time. The second polymer film was only 7 nm thick but highly viscoelastic. After rinsing with water the metal ions was flushed away and the second Im-EHEC layer was released. The imidazole modification of EHEC enables interaction with transition metal ions and opens up for new applications for cellulose based materials.