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

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

    Research output: Contribution to journalArticleScientificpeer-review

    28 Citations (Scopus)

    Abstract

    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
    Original languageEnglish
    Pages (from-to)9451-9454
    JournalApplied Surface Science
    Volume257
    Issue number22
    DOIs
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Aluminum oxide
    • atomic layer deposition
    • layer-by-layer deposition
    • polyelectrolyte
    • polylactide
    • water vapor barrier

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