High- and low-adhesive superhydrophobicity on the liquid flame spray-coated board and paper: structural effects on surface wetting and transition between the low- and high-adhesive states

Hannu Teisala, Mikko Tuominen, Mikko Aromaa, Milena Stepien, Jyrki M. Mäkelä, Jarkko Saarinen, Martti Toivakka, Jurkka Kuusipalo

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)

    Abstract

    Surface wetting is an important and relevant phenomenon in several different fields. Scientists have introduced a large number of applications where special surface wetting could be exploited. Here, we study wetting phenomena on high- and low-adhesive superhydrophobic liquid flame spray (LFS)-generated TiO2 coatings on paper and pigment-coated board substrates using water-ethanol solution as a probe liquid. Submicrometer-scale air gaps, which exist on superhydrophobic surfaces below the liquid droplets, were more stable with the ethanol increment than the larger-scale micrometric air gaps. With the droplet ethanol concentration of 15 wt%, static contact angle as high as 155 +/- 2A degrees was measured on the LFS-TiO2-coated board. Transition from the low-adhesive wetting state to the high-adhesive state was demonstrated on the LFS-TiO2-coated paper. The LFS method enables efficient roll-to-roll production of surfaces with special wetting properties on economically viable board and paper substrate materials.
    Original languageUndefined/Unknown
    Pages (from-to)447–455
    Number of pages9
    JournalColloid and Polymer Science
    Volume291
    Issue number2
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Contact angle hysteresis
    • Hierarchical roughness
    • Paper
    • Roll-to-roll process
    • Superhydrophobic
    • Wetting

    Cite this