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    Adsorption of Chitosan on PET Films Monitored by Quartz Crystal Microbalance

    Year: 2008

    Journal: Biomacromolecules, 9 (8), 2207–2214, 2008, 20100827

    Authors: Indest T. *†, Laine J. ‡, Ribitsch V. §, Johansson L-S ‡, Stana-Kleinschek K. †, Strnad S. †

    Last authors: Simona Strnad

    Organizations: Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor,⊥ Smetanova 17, SI-2000 Maribor, Slovenia, Laboratory of Forest Products Chemistry, Helsinki University of Technology, Post Office Box 6300, FI-02015 HUT, Finland, and Institute of Chemistry, Rheology, and Colloid Science, Karl Franzens University,⊥ Heinrichstrasse 28, A-8010 Graz, Austria

    Country: Slovenia

    The adsorption behavior of chitosan on poly(ethylene terephthalate) (PET) model film surface was studied using the quartz crystal microbalance (QCM) technique. QCM with a dissipation unit (QCM-D) represents a very sensitive technique for adsorption studies at the solid/liquid interface in situ, with capability of detecting a submonolayer of adsorbate on the quartz crystal surface. Chitosan as well as PET were chosen for this study due to their promising biocompatible properties and numerous possibilities to be used in biomedical applications. As a first step, PET foils were activated by alkaline hydrolysis in order to increase their hydrophilicity. Model thin films were prepared from PET foils by the spin coating technique. The chemical composition of the obtained model PET films was analyzed using X-ray photoelectron spectroscopy (XPS) and their morphology was characterized by atomic force microscopy (AFM). Furthermore, the adsorption behavior of chitosan on these activated PET films and the influence of adsorption parameters (pH, ionic strength and chitosan solution concentration) were investigated in detail. Additionally, the surface chemistry and morphology of the PET films and the chitosan coated PET films were analyzed with XPS and AFM.