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    Enhanced water vapor barrier properties for biopolymer films by polyelectrolyte multilayer and atomic layer deposited Al2O3 double-coating

    Year: 2011

    Journal: Applied surface science 2011 257 (22) pp 9451-9454, 20121211

    Authors: Terhi Hirvikorpi, Mika Vähä-Nissi, Ali Harlin, Mikko Salomäki, Sami Areva, Juuso T. Korhonen, Maarit Karppinen

    Organizations: VTT Technical Research Centre of Finland, Biologinkuja 7, Espoo, P.O. Box 1000, FI-02044 VTT, Finland; University of Turku, Department of Chemistry, Laboratory of Materials Chemistry and Chemical Analysis, Vatselankatu 2, FI-20014, Finland; Tampere University of Technology, Department of Biomedical Engineering, Biokatu 6, P.O. Box 692, FI-33101 Tampere, Finland; Aalto University School of Science, Department of Applied Physics, P.O. Box 15100 FI-00076 AALTO, Espoo, Finland; Aalto University School of Chemical Technology, Laboratory of Inorganic Chemistry, P.O. Box 16100, FI-00076 AALTO, Espoo, Finland

    Commercial polylactide (PLA) films are coated with a thin (20 nm) non-toxic polyelectrolyte multilayer (PEM) film made from sodium alginate and chitosan and additionally with a 25-nm thick atomic layer deposited (ALD) Al2O3 layer. The double-coating of PEM + Al2O3 is found to significantly enhance the water vapor barrier properties of the PLA film. The improvement is essentially larger compared with the case the PLA film being just coated with an ALD-grown Al2O3 layer. The enhanced water vapor barrier characteristics of the PEM + Al2O3 double-coated PLA films are attributed to the increased hydrophobicity of the surface of these films.